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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.hadoop.conf;

import com.google.common.annotations.VisibleForTesting;

import java.io.BufferedInputStream;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.lang.ref.WeakReference;
import java.net.InetSocketAddress;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Properties;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.WeakHashMap;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicReference;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import com.google.common.base.Charsets;
import org.apache.commons.collections.map.UnmodifiableMap;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.CommonConfigurationKeys;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableUtils;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.security.alias.CredentialProvider;
import org.apache.hadoop.security.alias.CredentialProvider.CredentialEntry;
import org.apache.hadoop.security.alias.CredentialProviderFactory;
import org.apache.hadoop.util.ReflectionUtils;
import org.apache.hadoop.util.StringInterner;
import org.apache.hadoop.util.StringUtils;
import org.codehaus.jackson.JsonFactory;
import org.codehaus.jackson.JsonGenerator;
import org.w3c.dom.DOMException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
import org.xml.sax.SAXException;

import com.google.common.base.Preconditions;

/** 
 * Provides access to configuration parameters.
 *
 * 

Resources

* *

Configurations are specified by resources. A resource contains a set of * name/value pairs as XML data. Each resource is named by either a * String or by a {@link Path}. If named by a String, * then the classpath is examined for a file with that name. If named by a * Path, then the local filesystem is examined directly, without * referring to the classpath. * *

Unless explicitly turned off, Hadoop by default specifies two * resources, loaded in-order from the classpath:

    *
  1. * * core-default.xml: Read-only defaults for hadoop.
  2. *
  3. core-site.xml: Site-specific configuration for a given hadoop * installation.
  4. *
* Applications may add additional resources, which are loaded * subsequent to these resources in the order they are added. * *

Final Parameters

* *

Configuration parameters may be declared final. * Once a resource declares a value final, no subsequently-loaded * resource can alter that value. * For example, one might define a final parameter with: *

 *  <property>
 *    <name>dfs.hosts.include</name>
 *    <value>/etc/hadoop/conf/hosts.include</value>
 *    <final>true</final>
 *  </property>
* * Administrators typically define parameters as final in * core-site.xml for values that user applications may not alter. * *

Variable Expansion

* *

Value strings are first processed for variable expansion. The * available properties are:

    *
  1. Other properties defined in this Configuration; and, if a name is * undefined here,
  2. *
  3. Properties in {@link System#getProperties()}.
  4. *
* *

For example, if a configuration resource contains the following property * definitions: *

 *  <property>
 *    <name>basedir</name>
 *    <value>/user/${user.name}</value>
 *  </property>
 *  
 *  <property>
 *    <name>tempdir</name>
 *    <value>${basedir}/tmp</value>
 *  </property>
* * When conf.get("tempdir") is called, then ${basedir} * will be resolved to another property in this Configuration, while * ${user.name} would then ordinarily be resolved to the value * of the System property with that name. * By default, warnings will be given to any deprecated configuration * parameters and these are suppressible by configuring * log4j.logger.org.apache.hadoop.conf.Configuration.deprecation in * log4j.properties file. */ @InterfaceAudience.Public @InterfaceStability.Stable public class Configuration implements Iterable>, Writable { private static final Log LOG = LogFactory.getLog(Configuration.class); private static final Log LOG_DEPRECATION = LogFactory.getLog("org.apache.hadoop.conf.Configuration.deprecation"); private boolean quietmode = true; private static final String DEFAULT_STRING_CHECK = "testingforemptydefaultvalue"; private static final String XINCLUDE_NS_URI = "http://www.w3.org/2001/XInclude"; private static boolean restrictSystemPropsDefault = false; private boolean restrictSystemProps = restrictSystemPropsDefault; private boolean allowNullValueProperties = false; private static class Resource { private final Object resource; private final String name; private final boolean restrictParser; public Resource(Object resource) { this(resource, resource.toString()); } public Resource(Object resource, boolean useRestrictedParser) { this(resource, resource.toString(), useRestrictedParser); } public Resource(Object resource, String name) { this(resource, name, getRestrictParserDefault(resource)); } public Resource(Object resource, String name, boolean restrictParser) { this.resource = resource; this.name = name; this.restrictParser = restrictParser; } public String getName(){ return name; } public Object getResource() { return resource; } public boolean isParserRestricted() { return restrictParser; } @Override public String toString() { return name; } private static boolean getRestrictParserDefault(Object resource) { if (resource instanceof String) { return false; } UserGroupInformation user; try { user = UserGroupInformation.getCurrentUser(); } catch (IOException e) { throw new RuntimeException("Unable to determine current user", e); } return user.getRealUser() != null; } } /** * List of configuration resources. */ private ArrayList resources = new ArrayList(); /** * The value reported as the setting resource when a key is set * by code rather than a file resource by dumpConfiguration. */ static final String UNKNOWN_RESOURCE = "Unknown"; /** * List of configuration parameters marked final. */ private Set finalParameters = Collections.newSetFromMap( new ConcurrentHashMap()); private boolean loadDefaults = true; /** * Configuration objects */ private static final WeakHashMap REGISTRY = new WeakHashMap(); /** * List of default Resources. Resources are loaded in the order of the list * entries */ private static final CopyOnWriteArrayList defaultResources = new CopyOnWriteArrayList(); private static final Map>>> CACHE_CLASSES = new WeakHashMap>>>(); /** * Sentinel value to store negative cache results in {@link #CACHE_CLASSES}. */ private static final Class NEGATIVE_CACHE_SENTINEL = NegativeCacheSentinel.class; /** * Stores the mapping of key to the resource which modifies or loads * the key most recently */ private Map updatingResource; /** * Class to keep the information about the keys which replace the deprecated * ones. * * This class stores the new keys which replace the deprecated keys and also * gives a provision to have a custom message for each of the deprecated key * that is being replaced. It also provides method to get the appropriate * warning message which can be logged whenever the deprecated key is used. */ private static class DeprecatedKeyInfo { private final String[] newKeys; private final String customMessage; private final AtomicBoolean accessed = new AtomicBoolean(false); DeprecatedKeyInfo(String[] newKeys, String customMessage) { this.newKeys = newKeys; this.customMessage = customMessage; } /** * Method to provide the warning message. It gives the custom message if * non-null, and default message otherwise. * @param key the associated deprecated key. * @return message that is to be logged when a deprecated key is used. */ private final String getWarningMessage(String key) { String warningMessage; if(customMessage == null) { StringBuilder message = new StringBuilder(key); String deprecatedKeySuffix = " is deprecated. Instead, use "; message.append(deprecatedKeySuffix); for (int i = 0; i < newKeys.length; i++) { message.append(newKeys[i]); if(i != newKeys.length-1) { message.append(", "); } } warningMessage = message.toString(); } else { warningMessage = customMessage; } return warningMessage; } boolean getAndSetAccessed() { return accessed.getAndSet(true); } public void clearAccessed() { accessed.set(false); } } /** * A pending addition to the global set of deprecated keys. */ public static class DeprecationDelta { private final String key; private final String[] newKeys; private final String customMessage; DeprecationDelta(String key, String[] newKeys, String customMessage) { Preconditions.checkNotNull(key); Preconditions.checkNotNull(newKeys); Preconditions.checkArgument(newKeys.length > 0); this.key = key; this.newKeys = newKeys; this.customMessage = customMessage; } public DeprecationDelta(String key, String newKey, String customMessage) { this(key, new String[] { newKey }, customMessage); } public DeprecationDelta(String key, String newKey) { this(key, new String[] { newKey }, null); } public String getKey() { return key; } public String[] getNewKeys() { return newKeys; } public String getCustomMessage() { return customMessage; } } /** * The set of all keys which are deprecated. * * DeprecationContext objects are immutable. */ private static class DeprecationContext { /** * Stores the deprecated keys, the new keys which replace the deprecated keys * and custom message(if any provided). */ private final Map deprecatedKeyMap; /** * Stores a mapping from superseding keys to the keys which they deprecate. */ private final Map reverseDeprecatedKeyMap; /** * Create a new DeprecationContext by copying a previous DeprecationContext * and adding some deltas. * * @param other The previous deprecation context to copy, or null to start * from nothing. * @param deltas The deltas to apply. */ @SuppressWarnings("unchecked") DeprecationContext(DeprecationContext other, DeprecationDelta[] deltas) { HashMap newDeprecatedKeyMap = new HashMap(); HashMap newReverseDeprecatedKeyMap = new HashMap(); if (other != null) { for (Entry entry : other.deprecatedKeyMap.entrySet()) { newDeprecatedKeyMap.put(entry.getKey(), entry.getValue()); } for (Entry entry : other.reverseDeprecatedKeyMap.entrySet()) { newReverseDeprecatedKeyMap.put(entry.getKey(), entry.getValue()); } } for (DeprecationDelta delta : deltas) { if (!newDeprecatedKeyMap.containsKey(delta.getKey())) { DeprecatedKeyInfo newKeyInfo = new DeprecatedKeyInfo(delta.getNewKeys(), delta.getCustomMessage()); newDeprecatedKeyMap.put(delta.key, newKeyInfo); for (String newKey : delta.getNewKeys()) { newReverseDeprecatedKeyMap.put(newKey, delta.key); } } } this.deprecatedKeyMap = UnmodifiableMap.decorate(newDeprecatedKeyMap); this.reverseDeprecatedKeyMap = UnmodifiableMap.decorate(newReverseDeprecatedKeyMap); } Map getDeprecatedKeyMap() { return deprecatedKeyMap; } Map getReverseDeprecatedKeyMap() { return reverseDeprecatedKeyMap; } } private static DeprecationDelta[] defaultDeprecations = new DeprecationDelta[] { new DeprecationDelta("topology.script.file.name", CommonConfigurationKeys.NET_TOPOLOGY_SCRIPT_FILE_NAME_KEY), new DeprecationDelta("topology.script.number.args", CommonConfigurationKeys.NET_TOPOLOGY_SCRIPT_NUMBER_ARGS_KEY), new DeprecationDelta("hadoop.configured.node.mapping", CommonConfigurationKeys.NET_TOPOLOGY_CONFIGURED_NODE_MAPPING_KEY), new DeprecationDelta("topology.node.switch.mapping.impl", CommonConfigurationKeys.NET_TOPOLOGY_NODE_SWITCH_MAPPING_IMPL_KEY), new DeprecationDelta("dfs.df.interval", CommonConfigurationKeys.FS_DF_INTERVAL_KEY), new DeprecationDelta("hadoop.native.lib", CommonConfigurationKeys.IO_NATIVE_LIB_AVAILABLE_KEY), new DeprecationDelta("fs.default.name", CommonConfigurationKeys.FS_DEFAULT_NAME_KEY), new DeprecationDelta("dfs.umaskmode", CommonConfigurationKeys.FS_PERMISSIONS_UMASK_KEY), new DeprecationDelta("dfs.nfs.exports.allowed.hosts", CommonConfigurationKeys.NFS_EXPORTS_ALLOWED_HOSTS_KEY) }; /** * The global DeprecationContext. */ private static AtomicReference deprecationContext = new AtomicReference( new DeprecationContext(null, defaultDeprecations)); /** * Adds a set of deprecated keys to the global deprecations. * * This method is lockless. It works by means of creating a new * DeprecationContext based on the old one, and then atomically swapping in * the new context. If someone else updated the context in between us reading * the old context and swapping in the new one, we try again until we win the * race. * * @param deltas The deprecations to add. */ public static void addDeprecations(DeprecationDelta[] deltas) { DeprecationContext prev, next; do { prev = deprecationContext.get(); next = new DeprecationContext(prev, deltas); } while (!deprecationContext.compareAndSet(prev, next)); } /** * Adds the deprecated key to the global deprecation map. * It does not override any existing entries in the deprecation map. * This is to be used only by the developers in order to add deprecation of * keys, and attempts to call this method after loading resources once, * would lead to UnsupportedOperationException * * If a key is deprecated in favor of multiple keys, they are all treated as * aliases of each other, and setting any one of them resets all the others * to the new value. * * If you have multiple deprecation entries to add, it is more efficient to * use #addDeprecations(DeprecationDelta[] deltas) instead. * * @param key * @param newKeys * @param customMessage * @deprecated use {@link #addDeprecation(String key, String newKey, String customMessage)} instead */ @Deprecated public static void addDeprecation(String key, String[] newKeys, String customMessage) { addDeprecations(new DeprecationDelta[] { new DeprecationDelta(key, newKeys, customMessage) }); } /** * Adds the deprecated key to the global deprecation map. * It does not override any existing entries in the deprecation map. * This is to be used only by the developers in order to add deprecation of * keys, and attempts to call this method after loading resources once, * would lead to UnsupportedOperationException * * If you have multiple deprecation entries to add, it is more efficient to * use #addDeprecations(DeprecationDelta[] deltas) instead. * * @param key * @param newKey * @param customMessage */ public static void addDeprecation(String key, String newKey, String customMessage) { addDeprecation(key, new String[] {newKey}, customMessage); } /** * Adds the deprecated key to the global deprecation map when no custom * message is provided. * It does not override any existing entries in the deprecation map. * This is to be used only by the developers in order to add deprecation of * keys, and attempts to call this method after loading resources once, * would lead to UnsupportedOperationException * * If a key is deprecated in favor of multiple keys, they are all treated as * aliases of each other, and setting any one of them resets all the others * to the new value. * * If you have multiple deprecation entries to add, it is more efficient to * use #addDeprecations(DeprecationDelta[] deltas) instead. * * @param key Key that is to be deprecated * @param newKeys list of keys that take up the values of deprecated key * @deprecated use {@link #addDeprecation(String key, String newKey)} instead */ @Deprecated public static void addDeprecation(String key, String[] newKeys) { addDeprecation(key, newKeys, null); } /** * Adds the deprecated key to the global deprecation map when no custom * message is provided. * It does not override any existing entries in the deprecation map. * This is to be used only by the developers in order to add deprecation of * keys, and attempts to call this method after loading resources once, * would lead to UnsupportedOperationException * * If you have multiple deprecation entries to add, it is more efficient to * use #addDeprecations(DeprecationDelta[] deltas) instead. * * @param key Key that is to be deprecated * @param newKey key that takes up the value of deprecated key */ public static void addDeprecation(String key, String newKey) { addDeprecation(key, new String[] {newKey}, null); } /** * checks whether the given key is deprecated. * * @param key the parameter which is to be checked for deprecation * @return true if the key is deprecated and * false otherwise. */ public static boolean isDeprecated(String key) { return deprecationContext.get().getDeprecatedKeyMap().containsKey(key); } /** * Sets all deprecated properties that are not currently set but have a * corresponding new property that is set. Useful for iterating the * properties when all deprecated properties for currently set properties * need to be present. */ public void setDeprecatedProperties() { DeprecationContext deprecations = deprecationContext.get(); Properties props = getProps(); Properties overlay = getOverlay(); for (Map.Entry entry : deprecations.getDeprecatedKeyMap().entrySet()) { String depKey = entry.getKey(); if (!overlay.contains(depKey)) { for (String newKey : entry.getValue().newKeys) { String val = overlay.getProperty(newKey); if (val != null) { props.setProperty(depKey, val); overlay.setProperty(depKey, val); break; } } } } } /** * Checks for the presence of the property name in the * deprecation map. Returns the first of the list of new keys if present * in the deprecation map or the name itself. If the property * is not presently set but the property map contains an entry for the * deprecated key, the value of the deprecated key is set as the value for * the provided property name. * * @param name the property name * @return the first property in the list of properties mapping * the name or the name itself. */ private String[] handleDeprecation(DeprecationContext deprecations, String name) { if (null != name) { name = name.trim(); } ArrayList names = new ArrayList(); if (isDeprecated(name)) { DeprecatedKeyInfo keyInfo = deprecations.getDeprecatedKeyMap().get(name); warnOnceIfDeprecated(deprecations, name); for (String newKey : keyInfo.newKeys) { if(newKey != null) { names.add(newKey); } } } if(names.size() == 0) { names.add(name); } for(String n : names) { String deprecatedKey = deprecations.getReverseDeprecatedKeyMap().get(n); if (deprecatedKey != null && !getOverlay().containsKey(n) && getOverlay().containsKey(deprecatedKey)) { getProps().setProperty(n, getOverlay().getProperty(deprecatedKey)); getOverlay().setProperty(n, getOverlay().getProperty(deprecatedKey)); } } return names.toArray(new String[names.size()]); } private void handleDeprecation() { LOG.debug("Handling deprecation for all properties in config..."); DeprecationContext deprecations = deprecationContext.get(); Set keys = new HashSet(); keys.addAll(getProps().keySet()); for (Object item: keys) { LOG.debug("Handling deprecation for " + (String)item); handleDeprecation(deprecations, (String)item); } } static{ //print deprecation warning if hadoop-site.xml is found in classpath ClassLoader cL = Thread.currentThread().getContextClassLoader(); if (cL == null) { cL = Configuration.class.getClassLoader(); } if(cL.getResource("hadoop-site.xml")!=null) { LOG.warn("DEPRECATED: hadoop-site.xml found in the classpath. " + "Usage of hadoop-site.xml is deprecated. Instead use core-site.xml, " + "mapred-site.xml and hdfs-site.xml to override properties of " + "core-default.xml, mapred-default.xml and hdfs-default.xml " + "respectively"); } addDefaultResource("core-default.xml"); addDefaultResource("core-site.xml"); } private Properties properties; private Properties overlay; private ClassLoader classLoader; { classLoader = Thread.currentThread().getContextClassLoader(); if (classLoader == null) { classLoader = Configuration.class.getClassLoader(); } } /** A new configuration. */ public Configuration() { this(true); } /** A new configuration where the behavior of reading from the default * resources can be turned off. * * If the parameter {@code loadDefaults} is false, the new instance * will not load resources from the default files. * @param loadDefaults specifies whether to load from the default files */ public Configuration(boolean loadDefaults) { this.loadDefaults = loadDefaults; updatingResource = new ConcurrentHashMap(); synchronized(Configuration.class) { REGISTRY.put(this, null); } } /** * A new configuration with the same settings cloned from another. * * @param other the configuration from which to clone settings. */ @SuppressWarnings("unchecked") public Configuration(Configuration other) { this.resources = (ArrayList) other.resources.clone(); synchronized(other) { if (other.properties != null) { this.properties = (Properties)other.properties.clone(); } if (other.overlay!=null) { this.overlay = (Properties)other.overlay.clone(); } this.restrictSystemProps = other.restrictSystemProps; this.updatingResource = new ConcurrentHashMap( other.updatingResource); this.finalParameters = Collections.newSetFromMap( new ConcurrentHashMap()); this.finalParameters.addAll(other.finalParameters); } synchronized(Configuration.class) { REGISTRY.put(this, null); } this.classLoader = other.classLoader; this.loadDefaults = other.loadDefaults; setQuietMode(other.getQuietMode()); } /** * Add a default resource. Resources are loaded in the order of the resources * added. * @param name file name. File should be present in the classpath. */ public static synchronized void addDefaultResource(String name) { if(!defaultResources.contains(name)) { defaultResources.add(name); for(Configuration conf : REGISTRY.keySet()) { if(conf.loadDefaults) { conf.reloadConfiguration(); } } } } public static void setRestrictSystemPropertiesDefault(boolean val) { restrictSystemPropsDefault = val; } public void setRestrictSystemProperties(boolean val) { this.restrictSystemProps = val; } /** * Add a configuration resource. * * The properties of this resource will override properties of previously * added resources, unless they were marked final. * * @param name resource to be added, the classpath is examined for a file * with that name. */ public void addResource(String name) { addResourceObject(new Resource(name)); } public void addResource(String name, boolean restrictedParser) { addResourceObject(new Resource(name, restrictedParser)); } /** * Add a configuration resource. * * The properties of this resource will override properties of previously * added resources, unless they were marked final. * * @param url url of the resource to be added, the local filesystem is * examined directly to find the resource, without referring to * the classpath. */ public void addResource(URL url) { addResourceObject(new Resource(url)); } public void addResource(URL url, boolean restrictedParser) { addResourceObject(new Resource(url, restrictedParser)); } /** * Add a configuration resource. * * The properties of this resource will override properties of previously * added resources, unless they were marked final. * * @param file file-path of resource to be added, the local filesystem is * examined directly to find the resource, without referring to * the classpath. */ public void addResource(Path file) { addResourceObject(new Resource(file)); } public void addResource(Path file, boolean restrictedParser) { addResourceObject(new Resource(file, restrictedParser)); } /** * Add a configuration resource. * * The properties of this resource will override properties of previously * added resources, unless they were marked final. * * WARNING: The contents of the InputStream will be cached, by this method. * So use this sparingly because it does increase the memory consumption. * * @param in InputStream to deserialize the object from. In will be read from * when a get or set is called next. After it is read the stream will be * closed. */ public void addResource(InputStream in) { addResourceObject(new Resource(in)); } public void addResource(InputStream in, boolean restrictedParser) { addResourceObject(new Resource(in, restrictedParser)); } /** * Add a configuration resource. * * The properties of this resource will override properties of previously * added resources, unless they were marked final. * * @param in InputStream to deserialize the object from. * @param name the name of the resource because InputStream.toString is not * very descriptive some times. */ public void addResource(InputStream in, String name) { addResourceObject(new Resource(in, name)); } public void addResource(InputStream in, String name, boolean restrictedParser) { addResourceObject(new Resource(in, name, restrictedParser)); } /** * Add a configuration resource. * * The properties of this resource will override properties of previously * added resources, unless they were marked final. * * @param conf Configuration object from which to load properties */ public void addResource(Configuration conf) { addResourceObject(new Resource(conf.getProps())); } /** * Reload configuration from previously added resources. * * This method will clear all the configuration read from the added * resources, and final parameters. This will make the resources to * be read again before accessing the values. Values that are added * via set methods will overlay values read from the resources. */ public synchronized void reloadConfiguration() { properties = null; // trigger reload finalParameters.clear(); // clear site-limits } private synchronized void addResourceObject(Resource resource) { resources.add(resource); // add to resources restrictSystemProps |= resource.isParserRestricted(); reloadConfiguration(); } private static final int MAX_SUBST = 20; private static final int SUB_START_IDX = 0; private static final int SUB_END_IDX = SUB_START_IDX + 1; /** * This is a manual implementation of the following regex * "\\$\\{[^\\}\\$\u0020]+\\}". It can be 15x more efficient than * a regex matcher as demonstrated by HADOOP-11506. This is noticeable with * Hadoop apps building on the assumption Configuration#get is an O(1) * hash table lookup, especially when the eval is a long string. * * @param eval a string that may contain variables requiring expansion. * @return a 2-element int array res such that * eval.substring(res[0], res[1]) is "var" for the left-most occurrence of * ${var} in eval. If no variable is found -1, -1 is returned. */ private static int[] findSubVariable(String eval) { int[] result = {-1, -1}; int matchStart; int leftBrace; // scanning for a brace first because it's less frequent than $ // that can occur in nested class names // match_loop: for (matchStart = 1, leftBrace = eval.indexOf('{', matchStart); // minimum left brace position (follows '$') leftBrace > 0 // right brace of a smallest valid expression "${c}" && leftBrace + "{c".length() < eval.length(); leftBrace = eval.indexOf('{', matchStart)) { int matchedLen = 0; if (eval.charAt(leftBrace - 1) == '$') { int subStart = leftBrace + 1; // after '{' for (int i = subStart; i < eval.length(); i++) { switch (eval.charAt(i)) { case '}': if (matchedLen > 0) { // match result[SUB_START_IDX] = subStart; result[SUB_END_IDX] = subStart + matchedLen; break match_loop; } // fall through to skip 1 char case ' ': case '$': matchStart = i + 1; continue match_loop; default: matchedLen++; } } // scanned from "${" to the end of eval, and no reset via ' ', '$': // no match! break match_loop; } else { // not a start of a variable // matchStart = leftBrace + 1; } } return result; } /** * Attempts to repeatedly expand the value {@code expr} by replacing the * left-most substring of the form "${var}" in the following precedence order *
    *
  1. by the value of the Java system property "var" if defined
  2. *
  3. by the value of the configuration key "var" if defined
  4. *
* * If var is unbounded the current state of expansion "prefix${var}suffix" is * returned. * * @param expr the literal value of a config key * @return null if expr is null, otherwise the value resulting from expanding * expr using the algorithm above. * @throws IllegalArgumentException when more than * {@link Configuration#MAX_SUBST} replacements are required */ private String substituteVars(String expr) { if (expr == null) { return null; } String eval = expr; for (int s = 0; s < MAX_SUBST; s++) { final int[] varBounds = findSubVariable(eval); if (varBounds[SUB_START_IDX] == -1) { return eval; } final String var = eval.substring(varBounds[SUB_START_IDX], varBounds[SUB_END_IDX]); String val = null; if (!restrictSystemProps) { try { val = System.getProperty(var); } catch (SecurityException se) { LOG.warn("Unexpected SecurityException in Configuration", se); } } if (val == null) { val = getRaw(var); } if (val == null) { return eval; // return literal ${var}: var is unbound } final int dollar = varBounds[SUB_START_IDX] - "${".length(); final int afterRightBrace = varBounds[SUB_END_IDX] + "}".length(); // substitute eval = eval.substring(0, dollar) + val + eval.substring(afterRightBrace); } throw new IllegalStateException("Variable substitution depth too large: " + MAX_SUBST + " " + expr); } /** * Get the value of the name property, null if * no such property exists. If the key is deprecated, it returns the value of * the first key which replaces the deprecated key and is not null. * * Values are processed for variable expansion * before being returned. * * @param name the property name, will be trimmed before get value. * @return the value of the name or its replacing property, * or null if no such property exists. */ public String get(String name) { String[] names = handleDeprecation(deprecationContext.get(), name); String result = null; for(String n : names) { result = substituteVars(getProps().getProperty(n)); } return result; } /** * Set Configuration to allow keys without values during setup. Intended * for use during testing. * * @param val If true, will allow Configuration to store keys without values */ @VisibleForTesting public void setAllowNullValueProperties( boolean val ) { this.allowNullValueProperties = val; } public void setRestrictSystemProps(boolean val) { this.restrictSystemProps = val; } /** * Return existence of the name property, but only for * names which have no valid value, usually non-existent or commented * out in XML. * * @param name the property name * @return true if the property name exists without value */ @VisibleForTesting public boolean onlyKeyExists(String name) { String[] names = handleDeprecation(deprecationContext.get(), name); for(String n : names) { if ( getProps().getProperty(n,DEFAULT_STRING_CHECK) .equals(DEFAULT_STRING_CHECK) ) { return true; } } return false; } /** * Get the value of the name property as a trimmed String, * null if no such property exists. * If the key is deprecated, it returns the value of * the first key which replaces the deprecated key and is not null * * Values are processed for variable expansion * before being returned. * * @param name the property name. * @return the value of the name or its replacing property, * or null if no such property exists. */ public String getTrimmed(String name) { String value = get(name); if (null == value) { return null; } else { return value.trim(); } } /** * Get the value of the name property as a trimmed String, * defaultValue if no such property exists. * See @{Configuration#getTrimmed} for more details. * * @param name the property name. * @param defaultValue the property default value. * @return the value of the name or defaultValue * if it is not set. */ public String getTrimmed(String name, String defaultValue) { String ret = getTrimmed(name); return ret == null ? defaultValue : ret; } /** * Get the value of the name property, without doing * variable expansion.If the key is * deprecated, it returns the value of the first key which replaces * the deprecated key and is not null. * * @param name the property name. * @return the value of the name property or * its replacing property and null if no such property exists. */ public String getRaw(String name) { String[] names = handleDeprecation(deprecationContext.get(), name); String result = null; for(String n : names) { result = getProps().getProperty(n); } return result; } /** * Returns alternative names (non-deprecated keys or previously-set deprecated keys) * for a given non-deprecated key. * If the given key is deprecated, return null. * * @param name property name. * @return alternative names. */ private String[] getAlternativeNames(String name) { String altNames[] = null; DeprecatedKeyInfo keyInfo = null; DeprecationContext cur = deprecationContext.get(); String depKey = cur.getReverseDeprecatedKeyMap().get(name); if(depKey != null) { keyInfo = cur.getDeprecatedKeyMap().get(depKey); if(keyInfo.newKeys.length > 0) { if(getProps().containsKey(depKey)) { //if deprecated key is previously set explicitly List list = new ArrayList(); list.addAll(Arrays.asList(keyInfo.newKeys)); list.add(depKey); altNames = list.toArray(new String[list.size()]); } else { altNames = keyInfo.newKeys; } } } return altNames; } /** * Set the value of the name property. If * name is deprecated or there is a deprecated name associated to it, * it sets the value to both names. Name will be trimmed before put into * configuration. * * @param name property name. * @param value property value. */ public void set(String name, String value) { set(name, value, null); } /** * Set the value of the name property. If * name is deprecated, it also sets the value to * the keys that replace the deprecated key. Name will be trimmed before put * into configuration. * * @param name property name. * @param value property value. * @param source the place that this configuration value came from * (For debugging). * @throws IllegalArgumentException when the value or name is null. */ public void set(String name, String value, String source) { Preconditions.checkArgument( name != null, "Property name must not be null"); Preconditions.checkArgument( value != null, "The value of property " + name + " must not be null"); name = name.trim(); DeprecationContext deprecations = deprecationContext.get(); if (deprecations.getDeprecatedKeyMap().isEmpty()) { getProps(); } getOverlay().setProperty(name, value); getProps().setProperty(name, value); String newSource = (source == null ? "programatically" : source); if (!isDeprecated(name)) { updatingResource.put(name, new String[] {newSource}); String[] altNames = getAlternativeNames(name); if(altNames != null) { for(String n: altNames) { if(!n.equals(name)) { getOverlay().setProperty(n, value); getProps().setProperty(n, value); updatingResource.put(n, new String[] {newSource}); } } } } else { String[] names = handleDeprecation(deprecationContext.get(), name); String altSource = "because " + name + " is deprecated"; for(String n : names) { getOverlay().setProperty(n, value); getProps().setProperty(n, value); updatingResource.put(n, new String[] {altSource}); } } } private void warnOnceIfDeprecated(DeprecationContext deprecations, String name) { DeprecatedKeyInfo keyInfo = deprecations.getDeprecatedKeyMap().get(name); if (keyInfo != null && !keyInfo.getAndSetAccessed()) { LOG_DEPRECATION.info(keyInfo.getWarningMessage(name)); } } /** * Unset a previously set property. */ public synchronized void unset(String name) { String[] names = null; if (!isDeprecated(name)) { names = getAlternativeNames(name); if(names == null) { names = new String[]{name}; } } else { names = handleDeprecation(deprecationContext.get(), name); } for(String n: names) { getOverlay().remove(n); getProps().remove(n); } } /** * Sets a property if it is currently unset. * @param name the property name * @param value the new value */ public synchronized void setIfUnset(String name, String value) { if (get(name) == null) { set(name, value); } } private synchronized Properties getOverlay() { if (overlay==null){ overlay=new Properties(); } return overlay; } /** * Get the value of the name. If the key is deprecated, * it returns the value of the first key which replaces the deprecated key * and is not null. * If no such property exists, * then defaultValue is returned. * * @param name property name, will be trimmed before get value. * @param defaultValue default value. * @return property value, or defaultValue if the property * doesn't exist. */ public String get(String name, String defaultValue) { String[] names = handleDeprecation(deprecationContext.get(), name); String result = null; for(String n : names) { result = substituteVars(getProps().getProperty(n, defaultValue)); } return result; } /** * Get the value of the name property as an int. * * If no such property exists, the provided default value is returned, * or if the specified value is not a valid int, * then an error is thrown. * * @param name property name. * @param defaultValue default value. * @throws NumberFormatException when the value is invalid * @return property value as an int, * or defaultValue. */ public int getInt(String name, int defaultValue) { String valueString = getTrimmed(name); if (valueString == null) return defaultValue; String hexString = getHexDigits(valueString); if (hexString != null) { return Integer.parseInt(hexString, 16); } return Integer.parseInt(valueString); } /** * Get the value of the name property as a set of comma-delimited * int values. * * If no such property exists, an empty array is returned. * * @param name property name * @return property value interpreted as an array of comma-delimited * int values */ public int[] getInts(String name) { String[] strings = getTrimmedStrings(name); int[] ints = new int[strings.length]; for (int i = 0; i < strings.length; i++) { ints[i] = Integer.parseInt(strings[i]); } return ints; } /** * Set the value of the name property to an int. * * @param name property name. * @param value int value of the property. */ public void setInt(String name, int value) { set(name, Integer.toString(value)); } /** * Get the value of the name property as a long. * If no such property exists, the provided default value is returned, * or if the specified value is not a valid long, * then an error is thrown. * * @param name property name. * @param defaultValue default value. * @throws NumberFormatException when the value is invalid * @return property value as a long, * or defaultValue. */ public long getLong(String name, long defaultValue) { String valueString = getTrimmed(name); if (valueString == null) return defaultValue; String hexString = getHexDigits(valueString); if (hexString != null) { return Long.parseLong(hexString, 16); } return Long.parseLong(valueString); } /** * Get the value of the name property as a long or * human readable format. If no such property exists, the provided default * value is returned, or if the specified value is not a valid * long or human readable format, then an error is thrown. You * can use the following suffix (case insensitive): k(kilo), m(mega), g(giga), * t(tera), p(peta), e(exa) * * @param name property name. * @param defaultValue default value. * @throws NumberFormatException when the value is invalid * @return property value as a long, * or defaultValue. */ public long getLongBytes(String name, long defaultValue) { String valueString = getTrimmed(name); if (valueString == null) return defaultValue; return StringUtils.TraditionalBinaryPrefix.string2long(valueString); } private String getHexDigits(String value) { boolean negative = false; String str = value; String hexString = null; if (value.startsWith("-")) { negative = true; str = value.substring(1); } if (str.startsWith("0x") || str.startsWith("0X")) { hexString = str.substring(2); if (negative) { hexString = "-" + hexString; } return hexString; } return null; } /** * Set the value of the name property to a long. * * @param name property name. * @param value long value of the property. */ public void setLong(String name, long value) { set(name, Long.toString(value)); } /** * Get the value of the name property as a float. * If no such property exists, the provided default value is returned, * or if the specified value is not a valid float, * then an error is thrown. * * @param name property name. * @param defaultValue default value. * @throws NumberFormatException when the value is invalid * @return property value as a float, * or defaultValue. */ public float getFloat(String name, float defaultValue) { String valueString = getTrimmed(name); if (valueString == null) return defaultValue; return Float.parseFloat(valueString); } /** * Set the value of the name property to a float. * * @param name property name. * @param value property value. */ public void setFloat(String name, float value) { set(name,Float.toString(value)); } /** * Get the value of the name property as a double. * If no such property exists, the provided default value is returned, * or if the specified value is not a valid double, * then an error is thrown. * * @param name property name. * @param defaultValue default value. * @throws NumberFormatException when the value is invalid * @return property value as a double, * or defaultValue. */ public double getDouble(String name, double defaultValue) { String valueString = getTrimmed(name); if (valueString == null) return defaultValue; return Double.parseDouble(valueString); } /** * Set the value of the name property to a double. * * @param name property name. * @param value property value. */ public void setDouble(String name, double value) { set(name,Double.toString(value)); } /** * Get the value of the name property as a boolean. * If no such property is specified, or if the specified value is not a valid * boolean, then defaultValue is returned. * * @param name property name. * @param defaultValue default value. * @return property value as a boolean, * or defaultValue. */ public boolean getBoolean(String name, boolean defaultValue) { String valueString = getTrimmed(name); if (null == valueString || valueString.isEmpty()) { return defaultValue; } if (StringUtils.equalsIgnoreCase("true", valueString)) return true; else if (StringUtils.equalsIgnoreCase("false", valueString)) return false; else return defaultValue; } /** * Set the value of the name property to a boolean. * * @param name property name. * @param value boolean value of the property. */ public void setBoolean(String name, boolean value) { set(name, Boolean.toString(value)); } /** * Set the given property, if it is currently unset. * @param name property name * @param value new value */ public void setBooleanIfUnset(String name, boolean value) { setIfUnset(name, Boolean.toString(value)); } /** * Set the value of the name property to the given type. This * is equivalent to set(<name>, value.toString()). * @param name property name * @param value new value */ public > void setEnum(String name, T value) { set(name, value.toString()); } /** * Return value matching this enumerated type. * Note that the returned value is trimmed by this method. * @param name Property name * @param defaultValue Value returned if no mapping exists * @throws IllegalArgumentException If mapping is illegal for the type * provided */ public > T getEnum(String name, T defaultValue) { final String val = getTrimmed(name); return null == val ? defaultValue : Enum.valueOf(defaultValue.getDeclaringClass(), val); } enum ParsedTimeDuration { NS { TimeUnit unit() { return TimeUnit.NANOSECONDS; } String suffix() { return "ns"; } }, US { TimeUnit unit() { return TimeUnit.MICROSECONDS; } String suffix() { return "us"; } }, MS { TimeUnit unit() { return TimeUnit.MILLISECONDS; } String suffix() { return "ms"; } }, S { TimeUnit unit() { return TimeUnit.SECONDS; } String suffix() { return "s"; } }, M { TimeUnit unit() { return TimeUnit.MINUTES; } String suffix() { return "m"; } }, H { TimeUnit unit() { return TimeUnit.HOURS; } String suffix() { return "h"; } }, D { TimeUnit unit() { return TimeUnit.DAYS; } String suffix() { return "d"; } }; abstract TimeUnit unit(); abstract String suffix(); static ParsedTimeDuration unitFor(String s) { for (ParsedTimeDuration ptd : values()) { // iteration order is in decl order, so SECONDS matched last if (s.endsWith(ptd.suffix())) { return ptd; } } return null; } static ParsedTimeDuration unitFor(TimeUnit unit) { for (ParsedTimeDuration ptd : values()) { if (ptd.unit() == unit) { return ptd; } } return null; } } /** * Set the value of name to the given time duration. This * is equivalent to set(<name>, value + <time suffix>). * @param name Property name * @param value Time duration * @param unit Unit of time */ public void setTimeDuration(String name, long value, TimeUnit unit) { set(name, value + ParsedTimeDuration.unitFor(unit).suffix()); } /** * Return time duration in the given time unit. Valid units are encoded in * properties as suffixes: nanoseconds (ns), microseconds (us), milliseconds * (ms), seconds (s), minutes (m), hours (h), and days (d). * @param name Property name * @param defaultValue Value returned if no mapping exists. * @param unit Unit to convert the stored property, if it exists. * @throws NumberFormatException If the property stripped of its unit is not * a number */ public long getTimeDuration(String name, long defaultValue, TimeUnit unit) { String vStr = get(name); if (null == vStr) { return defaultValue; } vStr = vStr.trim(); ParsedTimeDuration vUnit = ParsedTimeDuration.unitFor(vStr); if (null == vUnit) { LOG.warn("No unit for " + name + "(" + vStr + ") assuming " + unit); vUnit = ParsedTimeDuration.unitFor(unit); } else { vStr = vStr.substring(0, vStr.lastIndexOf(vUnit.suffix())); } return unit.convert(Long.parseLong(vStr), vUnit.unit()); } /** * Get the value of the name property as a Pattern. * If no such property is specified, or if the specified value is not a valid * Pattern, then DefaultValue is returned. * Note that the returned value is NOT trimmed by this method. * * @param name property name * @param defaultValue default value * @return property value as a compiled Pattern, or defaultValue */ public Pattern getPattern(String name, Pattern defaultValue) { String valString = get(name); if (null == valString || valString.isEmpty()) { return defaultValue; } try { return Pattern.compile(valString); } catch (PatternSyntaxException pse) { LOG.warn("Regular expression '" + valString + "' for property '" + name + "' not valid. Using default", pse); return defaultValue; } } /** * Set the given property to Pattern. * If the pattern is passed as null, sets the empty pattern which results in * further calls to getPattern(...) returning the default value. * * @param name property name * @param pattern new value */ public void setPattern(String name, Pattern pattern) { assert pattern != null : "Pattern cannot be null"; set(name, pattern.pattern()); } /** * Gets information about why a property was set. Typically this is the * path to the resource objects (file, URL, etc.) the property came from, but * it can also indicate that it was set programatically, or because of the * command line. * * @param name - The property name to get the source of. * @return null - If the property or its source wasn't found. Otherwise, * returns a list of the sources of the resource. The older sources are * the first ones in the list. So for example if a configuration is set from * the command line, and then written out to a file that is read back in the * first entry would indicate that it was set from the command line, while * the second one would indicate the file that the new configuration was read * in from. */ @InterfaceStability.Unstable public synchronized String[] getPropertySources(String name) { if (properties == null) { // If properties is null, it means a resource was newly added // but the props were cleared so as to load it upon future // requests. So lets force a load by asking a properties list. getProps(); } // Return a null right away if our properties still // haven't loaded or the resource mapping isn't defined if (properties == null || updatingResource == null) { return null; } else { String[] source = updatingResource.get(name); if(source == null) { return null; } else { return Arrays.copyOf(source, source.length); } } } /** * A class that represents a set of positive integer ranges. It parses * strings of the form: "2-3,5,7-" where ranges are separated by comma and * the lower/upper bounds are separated by dash. Either the lower or upper * bound may be omitted meaning all values up to or over. So the string * above means 2, 3, 5, and 7, 8, 9, ... */ public static class IntegerRanges implements Iterable{ private static class Range { int start; int end; } private static class RangeNumberIterator implements Iterator { Iterator internal; int at; int end; public RangeNumberIterator(List ranges) { if (ranges != null) { internal = ranges.iterator(); } at = -1; end = -2; } @Override public boolean hasNext() { if (at <= end) { return true; } else if (internal != null){ return internal.hasNext(); } return false; } @Override public Integer next() { if (at <= end) { at++; return at - 1; } else if (internal != null){ Range found = internal.next(); if (found != null) { at = found.start; end = found.end; at++; return at - 1; } } return null; } @Override public void remove() { throw new UnsupportedOperationException(); } }; List ranges = new ArrayList(); public IntegerRanges() { } public IntegerRanges(String newValue) { StringTokenizer itr = new StringTokenizer(newValue, ","); while (itr.hasMoreTokens()) { String rng = itr.nextToken().trim(); String[] parts = rng.split("-", 3); if (parts.length < 1 || parts.length > 2) { throw new IllegalArgumentException("integer range badly formed: " + rng); } Range r = new Range(); r.start = convertToInt(parts[0], 0); if (parts.length == 2) { r.end = convertToInt(parts[1], Integer.MAX_VALUE); } else { r.end = r.start; } if (r.start > r.end) { throw new IllegalArgumentException("IntegerRange from " + r.start + " to " + r.end + " is invalid"); } ranges.add(r); } } /** * Convert a string to an int treating empty strings as the default value. * @param value the string value * @param defaultValue the value for if the string is empty * @return the desired integer */ private static int convertToInt(String value, int defaultValue) { String trim = value.trim(); if (trim.length() == 0) { return defaultValue; } return Integer.parseInt(trim); } /** * Is the given value in the set of ranges * @param value the value to check * @return is the value in the ranges? */ public boolean isIncluded(int value) { for(Range r: ranges) { if (r.start <= value && value <= r.end) { return true; } } return false; } /** * @return true if there are no values in this range, else false. */ public boolean isEmpty() { return ranges == null || ranges.isEmpty(); } @Override public String toString() { StringBuilder result = new StringBuilder(); boolean first = true; for(Range r: ranges) { if (first) { first = false; } else { result.append(','); } result.append(r.start); result.append('-'); result.append(r.end); } return result.toString(); } @Override public Iterator iterator() { return new RangeNumberIterator(ranges); } } /** * Parse the given attribute as a set of integer ranges * @param name the attribute name * @param defaultValue the default value if it is not set * @return a new set of ranges from the configured value */ public IntegerRanges getRange(String name, String defaultValue) { return new IntegerRanges(get(name, defaultValue)); } /** * Get the comma delimited values of the name property as * a collection of Strings. * If no such property is specified then empty collection is returned. *

* This is an optimized version of {@link #getStrings(String)} * * @param name property name. * @return property value as a collection of Strings. */ public Collection getStringCollection(String name) { String valueString = get(name); return StringUtils.getStringCollection(valueString); } /** * Get the comma delimited values of the name property as * an array of Strings. * If no such property is specified then null is returned. * * @param name property name. * @return property value as an array of Strings, * or null. */ public String[] getStrings(String name) { String valueString = get(name); return StringUtils.getStrings(valueString); } /** * Get the comma delimited values of the name property as * an array of Strings. * If no such property is specified then default value is returned. * * @param name property name. * @param defaultValue The default value * @return property value as an array of Strings, * or default value. */ public String[] getStrings(String name, String... defaultValue) { String valueString = get(name); if (valueString == null) { return defaultValue; } else { return StringUtils.getStrings(valueString); } } /** * Get the comma delimited values of the name property as * a collection of Strings, trimmed of the leading and trailing whitespace. * If no such property is specified then empty Collection is returned. * * @param name property name. * @return property value as a collection of Strings, or empty Collection */ public Collection getTrimmedStringCollection(String name) { String valueString = get(name); if (null == valueString) { Collection empty = new ArrayList(); return empty; } return StringUtils.getTrimmedStringCollection(valueString); } /** * Get the comma delimited values of the name property as * an array of Strings, trimmed of the leading and trailing whitespace. * If no such property is specified then an empty array is returned. * * @param name property name. * @return property value as an array of trimmed Strings, * or empty array. */ public String[] getTrimmedStrings(String name) { String valueString = get(name); return StringUtils.getTrimmedStrings(valueString); } /** * Get the comma delimited values of the name property as * an array of Strings, trimmed of the leading and trailing whitespace. * If no such property is specified then default value is returned. * * @param name property name. * @param defaultValue The default value * @return property value as an array of trimmed Strings, * or default value. */ public String[] getTrimmedStrings(String name, String... defaultValue) { String valueString = get(name); if (null == valueString) { return defaultValue; } else { return StringUtils.getTrimmedStrings(valueString); } } /** * Set the array of string values for the name property as * as comma delimited values. * * @param name property name. * @param values The values */ public void setStrings(String name, String... values) { set(name, StringUtils.arrayToString(values)); } /** * Get the value for a known password configuration element. * In order to enable the elimination of clear text passwords in config, * this method attempts to resolve the property name as an alias through * the CredentialProvider API and conditionally fallsback to config. * @param name property name * @return password */ public char[] getPassword(String name) throws IOException { char[] pass = null; pass = getPasswordFromCredentialProviders(name); if (pass == null) { pass = getPasswordFromConfig(name); } return pass; } /** * Try and resolve the provided element name as a credential provider * alias. * @param name alias of the provisioned credential * @return password or null if not found * @throws IOException */ protected char[] getPasswordFromCredentialProviders(String name) throws IOException { char[] pass = null; try { List providers = CredentialProviderFactory.getProviders(this); if (providers != null) { for (CredentialProvider provider : providers) { try { CredentialEntry entry = provider.getCredentialEntry(name); if (entry != null) { pass = entry.getCredential(); break; } } catch (IOException ioe) { throw new IOException("Can't get key " + name + " from key provider" + "of type: " + provider.getClass().getName() + ".", ioe); } } } } catch (IOException ioe) { throw new IOException("Configuration problem with provider path.", ioe); } return pass; } /** * Fallback to clear text passwords in configuration. * @param name * @return clear text password or null */ protected char[] getPasswordFromConfig(String name) { char[] pass = null; if (getBoolean(CredentialProvider.CLEAR_TEXT_FALLBACK, true)) { String passStr = get(name); if (passStr != null) { pass = passStr.toCharArray(); } } return pass; } /** * Get the socket address for hostProperty as a * InetSocketAddress. If hostProperty is * null, addressProperty will be used. This * is useful for cases where we want to differentiate between host * bind address and address clients should use to establish connection. * * @param hostProperty bind host property name. * @param addressProperty address property name. * @param defaultAddressValue the default value * @param defaultPort the default port * @return InetSocketAddress */ public InetSocketAddress getSocketAddr( String hostProperty, String addressProperty, String defaultAddressValue, int defaultPort) { InetSocketAddress bindAddr = getSocketAddr( addressProperty, defaultAddressValue, defaultPort); final String host = get(hostProperty); if (host == null || host.isEmpty()) { return bindAddr; } return NetUtils.createSocketAddr( host, bindAddr.getPort(), hostProperty); } /** * Get the socket address for name property as a * InetSocketAddress. * @param name property name. * @param defaultAddress the default value * @param defaultPort the default port * @return InetSocketAddress */ public InetSocketAddress getSocketAddr( String name, String defaultAddress, int defaultPort) { final String address = getTrimmed(name, defaultAddress); return NetUtils.createSocketAddr(address, defaultPort, name); } /** * Set the socket address for the name property as * a host:port. */ public void setSocketAddr(String name, InetSocketAddress addr) { set(name, NetUtils.getHostPortString(addr)); } /** * Set the socket address a client can use to connect for the * name property as a host:port. The wildcard * address is replaced with the local host's address. If the host and address * properties are configured the host component of the address will be combined * with the port component of the addr to generate the address. This is to allow * optional control over which host name is used in multi-home bind-host * cases where a host can have multiple names * @param hostProperty the bind-host configuration name * @param addressProperty the service address configuration name * @param defaultAddressValue the service default address configuration value * @param addr InetSocketAddress of the service listener * @return InetSocketAddress for clients to connect */ public InetSocketAddress updateConnectAddr( String hostProperty, String addressProperty, String defaultAddressValue, InetSocketAddress addr) { final String host = get(hostProperty); final String connectHostPort = getTrimmed(addressProperty, defaultAddressValue); if (host == null || host.isEmpty() || connectHostPort == null || connectHostPort.isEmpty()) { //not our case, fall back to original logic return updateConnectAddr(addressProperty, addr); } final String connectHost = connectHostPort.split(":")[0]; // Create connect address using client address hostname and server port. return updateConnectAddr(addressProperty, NetUtils.createSocketAddrForHost( connectHost, addr.getPort())); } /** * Set the socket address a client can use to connect for the * name property as a host:port. The wildcard * address is replaced with the local host's address. * @param name property name. * @param addr InetSocketAddress of a listener to store in the given property * @return InetSocketAddress for clients to connect */ public InetSocketAddress updateConnectAddr(String name, InetSocketAddress addr) { final InetSocketAddress connectAddr = NetUtils.getConnectAddress(addr); setSocketAddr(name, connectAddr); return connectAddr; } /** * Load a class by name. * * @param name the class name. * @return the class object. * @throws ClassNotFoundException if the class is not found. */ public Class getClassByName(String name) throws ClassNotFoundException { Class ret = getClassByNameOrNull(name); if (ret == null) { throw new ClassNotFoundException("Class " + name + " not found"); } return ret; } /** * Load a class by name, returning null rather than throwing an exception * if it couldn't be loaded. This is to avoid the overhead of creating * an exception. * * @param name the class name * @return the class object, or null if it could not be found. */ public Class getClassByNameOrNull(String name) { Map>> map; synchronized (CACHE_CLASSES) { map = CACHE_CLASSES.get(classLoader); if (map == null) { map = Collections.synchronizedMap( new WeakHashMap>>()); CACHE_CLASSES.put(classLoader, map); } } Class clazz = null; WeakReference> ref = map.get(name); if (ref != null) { clazz = ref.get(); } if (clazz == null) { try { clazz = Class.forName(name, true, classLoader); } catch (ClassNotFoundException e) { // Leave a marker that the class isn't found map.put(name, new WeakReference>(NEGATIVE_CACHE_SENTINEL)); return null; } // two putters can race here, but they'll put the same class map.put(name, new WeakReference>(clazz)); return clazz; } else if (clazz == NEGATIVE_CACHE_SENTINEL) { return null; // not found } else { // cache hit return clazz; } } /** * Get the value of the name property * as an array of Class. * The value of the property specifies a list of comma separated class names. * If no such property is specified, then defaultValue is * returned. * * @param name the property name. * @param defaultValue default value. * @return property value as a Class[], * or defaultValue. */ public Class[] getClasses(String name, Class ... defaultValue) { String valueString = getRaw(name); if (null == valueString) { return defaultValue; } String[] classnames = getTrimmedStrings(name); try { Class[] classes = new Class[classnames.length]; for(int i = 0; i < classnames.length; i++) { classes[i] = getClassByName(classnames[i]); } return classes; } catch (ClassNotFoundException e) { throw new RuntimeException(e); } } /** * Get the value of the name property as a Class. * If no such property is specified, then defaultValue is * returned. * * @param name the class name. * @param defaultValue default value. * @return property value as a Class, * or defaultValue. */ public Class getClass(String name, Class defaultValue) { String valueString = getTrimmed(name); if (valueString == null) return defaultValue; try { return getClassByName(valueString); } catch (ClassNotFoundException e) { throw new RuntimeException(e); } } /** * Get the value of the name property as a Class * implementing the interface specified by xface. * * If no such property is specified, then defaultValue is * returned. * * An exception is thrown if the returned class does not implement the named * interface. * * @param name the class name. * @param defaultValue default value. * @param xface the interface implemented by the named class. * @return property value as a Class, * or defaultValue. */ public Class getClass(String name, Class defaultValue, Class xface) { try { Class theClass = getClass(name, defaultValue); if (theClass != null && !xface.isAssignableFrom(theClass)) throw new RuntimeException(theClass+" not "+xface.getName()); else if (theClass != null) return theClass.asSubclass(xface); else return null; } catch (Exception e) { throw new RuntimeException(e); } } /** * Get the value of the name property as a List * of objects implementing the interface specified by xface. * * An exception is thrown if any of the classes does not exist, or if it does * not implement the named interface. * * @param name the property name. * @param xface the interface implemented by the classes named by * name. * @return a List of objects implementing xface. */ @SuppressWarnings("unchecked") public List getInstances(String name, Class xface) { List ret = new ArrayList(); Class[] classes = getClasses(name); for (Class cl: classes) { if (!xface.isAssignableFrom(cl)) { throw new RuntimeException(cl + " does not implement " + xface); } ret.add((U)ReflectionUtils.newInstance(cl, this)); } return ret; } /** * Set the value of the name property to the name of a * theClass implementing the given interface xface. * * An exception is thrown if theClass does not implement the * interface xface. * * @param name property name. * @param theClass property value. * @param xface the interface implemented by the named class. */ public void setClass(String name, Class theClass, Class xface) { if (!xface.isAssignableFrom(theClass)) throw new RuntimeException(theClass+" not "+xface.getName()); set(name, theClass.getName()); } /** * Get a local file under a directory named by dirsProp with * the given path. If dirsProp contains multiple directories, * then one is chosen based on path's hash code. If the selected * directory does not exist, an attempt is made to create it. * * @param dirsProp directory in which to locate the file. * @param path file-path. * @return local file under the directory with the given path. */ public Path getLocalPath(String dirsProp, String path) throws IOException { String[] dirs = getTrimmedStrings(dirsProp); int hashCode = path.hashCode(); FileSystem fs = FileSystem.getLocal(this); for (int i = 0; i < dirs.length; i++) { // try each local dir int index = (hashCode+i & Integer.MAX_VALUE) % dirs.length; Path file = new Path(dirs[index], path); Path dir = file.getParent(); if (fs.mkdirs(dir) || fs.exists(dir)) { return file; } } LOG.warn("Could not make " + path + " in local directories from " + dirsProp); for(int i=0; i < dirs.length; i++) { int index = (hashCode+i & Integer.MAX_VALUE) % dirs.length; LOG.warn(dirsProp + "[" + index + "]=" + dirs[index]); } throw new IOException("No valid local directories in property: "+dirsProp); } /** * Get a local file name under a directory named in dirsProp with * the given path. If dirsProp contains multiple directories, * then one is chosen based on path's hash code. If the selected * directory does not exist, an attempt is made to create it. * * @param dirsProp directory in which to locate the file. * @param path file-path. * @return local file under the directory with the given path. */ public File getFile(String dirsProp, String path) throws IOException { String[] dirs = getTrimmedStrings(dirsProp); int hashCode = path.hashCode(); for (int i = 0; i < dirs.length; i++) { // try each local dir int index = (hashCode+i & Integer.MAX_VALUE) % dirs.length; File file = new File(dirs[index], path); File dir = file.getParentFile(); if (dir.exists() || dir.mkdirs()) { return file; } } throw new IOException("No valid local directories in property: "+dirsProp); } /** * Get the {@link URL} for the named resource. * * @param name resource name. * @return the url for the named resource. */ public URL getResource(String name) { return classLoader.getResource(name); } /** * Get an input stream attached to the configuration resource with the * given name. * * @param name configuration resource name. * @return an input stream attached to the resource. */ public InputStream getConfResourceAsInputStream(String name) { try { URL url= getResource(name); if (url == null) { LOG.info(name + " not found"); return null; } else { LOG.info("found resource " + name + " at " + url); } return url.openStream(); } catch (Exception e) { return null; } } /** * Get a {@link Reader} attached to the configuration resource with the * given name. * * @param name configuration resource name. * @return a reader attached to the resource. */ public Reader getConfResourceAsReader(String name) { try { URL url= getResource(name); if (url == null) { LOG.info(name + " not found"); return null; } else { LOG.info("found resource " + name + " at " + url); } return new InputStreamReader(url.openStream(), Charsets.UTF_8); } catch (Exception e) { return null; } } /** * Get the set of parameters marked final. * * @return final parameter set. */ public Set getFinalParameters() { Set setFinalParams = Collections.newSetFromMap( new ConcurrentHashMap()); setFinalParams.addAll(finalParameters); return setFinalParams; } protected synchronized Properties getProps() { if (properties == null) { properties = new Properties(); Map backup = new ConcurrentHashMap(updatingResource); loadResources(properties, resources, quietmode); if (overlay != null) { properties.putAll(overlay); for (Map.Entry item: overlay.entrySet()) { String key = (String)item.getKey(); String[] source = backup.get(key); if(source != null) { updatingResource.put(key, source); } } } } return properties; } /** * Return the number of keys in the configuration. * * @return number of keys in the configuration. */ public int size() { return getProps().size(); } /** * Clears all keys from the configuration. */ public void clear() { getProps().clear(); getOverlay().clear(); } /** * Get an {@link Iterator} to go through the list of String * key-value pairs in the configuration. * * @return an iterator over the entries. */ @Override public Iterator> iterator() { // Get a copy of just the string to string pairs. After the old object // methods that allow non-strings to be put into configurations are removed, // we could replace properties with a Map and get rid of this // code. Map result = new HashMap(); for(Map.Entry item: getProps().entrySet()) { if (item.getKey() instanceof String && item.getValue() instanceof String) { result.put((String) item.getKey(), (String) item.getValue()); } } return result.entrySet().iterator(); } private Document parse(DocumentBuilder builder, URL url) throws IOException, SAXException { if (!quietmode) { LOG.debug("parsing URL " + url); } if (url == null) { return null; } return parse(builder, url.openStream(), url.toString()); } private Document parse(DocumentBuilder builder, InputStream is, String systemId) throws IOException, SAXException { if (!quietmode) { LOG.debug("parsing input stream " + is); } if (is == null) { return null; } try { return (systemId == null) ? builder.parse(is) : builder.parse(is, systemId); } finally { is.close(); } } private void loadResources(Properties properties, ArrayList resources, boolean quiet) { if(loadDefaults) { for (String resource : defaultResources) { loadResource(properties, new Resource(resource, false), quiet); } //support the hadoop-site.xml as a deprecated case if(getResource("hadoop-site.xml")!=null) { loadResource(properties, new Resource("hadoop-site.xml", false), quiet); } } for (int i = 0; i < resources.size(); i++) { Resource ret = loadResource(properties, resources.get(i), quiet); if (ret != null) { resources.set(i, ret); } } } private Resource loadResource(Properties properties, Resource wrapper, boolean quiet) { String name = UNKNOWN_RESOURCE; try { Object resource = wrapper.getResource(); name = wrapper.getName(); DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance(); //ignore all comments inside the xml file docBuilderFactory.setIgnoringComments(true); //allow includes in the xml file docBuilderFactory.setNamespaceAware(true); boolean useXInclude = !wrapper.isParserRestricted(); try { docBuilderFactory.setXIncludeAware(useXInclude); } catch (UnsupportedOperationException e) { LOG.error("Failed to set setXIncludeAware(" + useXInclude + ") for parser " + docBuilderFactory, e); } if (wrapper.isParserRestricted()) { docBuilderFactory.setFeature( "http://apache.org/xml/features/disallow-doctype-decl", true); } DocumentBuilder builder = docBuilderFactory.newDocumentBuilder(); Document doc = null; Element root = null; boolean returnCachedProperties = false; if (resource instanceof URL) { // an URL resource doc = parse(builder, (URL)resource); } else if (resource instanceof String) { // a CLASSPATH resource URL url = getResource((String)resource); doc = parse(builder, url); } else if (resource instanceof Path) { // a file resource // Can't use FileSystem API or we get an infinite loop // since FileSystem uses Configuration API. Use java.io.File instead. File file = new File(((Path)resource).toUri().getPath()) .getAbsoluteFile(); if (file.exists()) { if (!quiet) { LOG.debug("parsing File " + file); } doc = parse(builder, new BufferedInputStream( new FileInputStream(file)), ((Path)resource).toString()); } } else if (resource instanceof InputStream) { doc = parse(builder, (InputStream) resource, null); returnCachedProperties = true; } else if (resource instanceof Properties) { overlay(properties, (Properties)resource); } else if (resource instanceof Element) { root = (Element)resource; } if (root == null) { if (doc == null) { if (quiet) { return null; } throw new RuntimeException(resource + " not found"); } root = doc.getDocumentElement(); } Properties toAddTo = properties; if(returnCachedProperties) { toAddTo = new Properties(); } if (!"configuration".equals(root.getTagName())) LOG.fatal("bad conf file: top-level element not "); NodeList props = root.getChildNodes(); DeprecationContext deprecations = deprecationContext.get(); for (int i = 0; i < props.getLength(); i++) { Node propNode = props.item(i); if (!(propNode instanceof Element)) continue; Element prop = (Element)propNode; if ("configuration".equals(prop.getTagName())) { loadResource(toAddTo, new Resource(prop, name, wrapper.isParserRestricted()), quiet); continue; } if (!"property".equals(prop.getTagName())) { if (wrapper.isParserRestricted() && XINCLUDE_NS_URI.equals(prop.getNamespaceURI())) { throw new RuntimeException("Error parsing resource " + wrapper + ": XInclude is not supported for restricted resources"); } LOG.warn("Unexpected tag in conf file " + wrapper + ": expected but found <" + prop.getTagName() + ">"); } NodeList fields = prop.getChildNodes(); String attr = null; String value = null; boolean finalParameter = false; LinkedList source = new LinkedList(); for (int j = 0; j < fields.getLength(); j++) { Node fieldNode = fields.item(j); if (!(fieldNode instanceof Element)) continue; Element field = (Element)fieldNode; if ("name".equals(field.getTagName()) && field.hasChildNodes()) attr = StringInterner.weakIntern( ((Text)field.getFirstChild()).getData().trim()); if ("value".equals(field.getTagName()) && field.hasChildNodes()) value = StringInterner.weakIntern( ((Text)field.getFirstChild()).getData()); if ("final".equals(field.getTagName()) && field.hasChildNodes()) finalParameter = "true".equals(((Text)field.getFirstChild()).getData()); if ("source".equals(field.getTagName()) && field.hasChildNodes()) source.add(StringInterner.weakIntern( ((Text)field.getFirstChild()).getData())); } source.add(name); // Ignore this parameter if it has already been marked as 'final' if (attr != null) { if (deprecations.getDeprecatedKeyMap().containsKey(attr)) { DeprecatedKeyInfo keyInfo = deprecations.getDeprecatedKeyMap().get(attr); keyInfo.clearAccessed(); for (String key:keyInfo.newKeys) { // update new keys with deprecated key's value loadProperty(toAddTo, name, key, value, finalParameter, source.toArray(new String[source.size()])); } } else { loadProperty(toAddTo, name, attr, value, finalParameter, source.toArray(new String[source.size()])); } } } if (returnCachedProperties) { overlay(properties, toAddTo); return new Resource(toAddTo, name, wrapper.isParserRestricted()); } return null; } catch (IOException e) { LOG.fatal("error parsing conf " + name, e); throw new RuntimeException(e); } catch (DOMException e) { LOG.fatal("error parsing conf " + name, e); throw new RuntimeException(e); } catch (SAXException e) { LOG.fatal("error parsing conf " + name, e); throw new RuntimeException(e); } catch (ParserConfigurationException e) { LOG.fatal("error parsing conf " + name , e); throw new RuntimeException(e); } } private void overlay(Properties to, Properties from) { for (Entry entry: from.entrySet()) { to.put(entry.getKey(), entry.getValue()); } } private void loadProperty(Properties properties, String name, String attr, String value, boolean finalParameter, String[] source) { if (value != null || allowNullValueProperties) { if (!finalParameters.contains(attr)) { if (value==null && allowNullValueProperties) { value = DEFAULT_STRING_CHECK; } properties.setProperty(attr, value); if(source != null) { updatingResource.put(attr, source); } } else if (!value.equals(properties.getProperty(attr))) { LOG.warn(name+":an attempt to override final parameter: "+attr +"; Ignoring."); } } if (finalParameter && attr != null) { finalParameters.add(attr); } } /** * Write out the non-default properties in this configuration to the given * {@link OutputStream} using UTF-8 encoding. * * @param out the output stream to write to. */ public void writeXml(OutputStream out) throws IOException { writeXml(new OutputStreamWriter(out, "UTF-8")); } /** * Write out the non-default properties in this configuration to the given * {@link Writer}. * * @param out the writer to write to. */ public void writeXml(Writer out) throws IOException { Document doc = asXmlDocument(); try { DOMSource source = new DOMSource(doc); StreamResult result = new StreamResult(out); TransformerFactory transFactory = TransformerFactory.newInstance(); Transformer transformer = transFactory.newTransformer(); // Important to not hold Configuration log while writing result, since // 'out' may be an HDFS stream which needs to lock this configuration // from another thread. transformer.transform(source, result); } catch (TransformerException te) { throw new IOException(te); } } /** * Return the XML DOM corresponding to this Configuration. */ private synchronized Document asXmlDocument() throws IOException { Document doc; try { doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument(); } catch (ParserConfigurationException pe) { throw new IOException(pe); } Element conf = doc.createElement("configuration"); doc.appendChild(conf); conf.appendChild(doc.createTextNode("\n")); handleDeprecation(); //ensure properties is set and deprecation is handled for (Enumeration e = properties.keys(); e.hasMoreElements();) { String name = (String)e.nextElement(); Object object = properties.get(name); String value = null; if (object instanceof String) { value = (String) object; }else { continue; } Element propNode = doc.createElement("property"); conf.appendChild(propNode); Element nameNode = doc.createElement("name"); nameNode.appendChild(doc.createTextNode(name)); propNode.appendChild(nameNode); Element valueNode = doc.createElement("value"); valueNode.appendChild(doc.createTextNode(value)); propNode.appendChild(valueNode); if (updatingResource != null) { String[] sources = updatingResource.get(name); if(sources != null) { for(String s : sources) { Element sourceNode = doc.createElement("source"); sourceNode.appendChild(doc.createTextNode(s)); propNode.appendChild(sourceNode); } } } conf.appendChild(doc.createTextNode("\n")); } return doc; } /** * Writes out all the parameters and their properties (final and resource) to * the given {@link Writer} * The format of the output would be * { "properties" : [ {key1,value1,key1.isFinal,key1.resource}, {key2,value2, * key2.isFinal,key2.resource}... ] } * It does not output the parameters of the configuration object which is * loaded from an input stream. * @param out the Writer to write to * @throws IOException */ public static void dumpConfiguration(Configuration config, Writer out) throws IOException { JsonFactory dumpFactory = new JsonFactory(); JsonGenerator dumpGenerator = dumpFactory.createJsonGenerator(out); dumpGenerator.writeStartObject(); dumpGenerator.writeFieldName("properties"); dumpGenerator.writeStartArray(); dumpGenerator.flush(); synchronized (config) { for (Map.Entry item: config.getProps().entrySet()) { dumpGenerator.writeStartObject(); dumpGenerator.writeStringField("key", (String) item.getKey()); dumpGenerator.writeStringField("value", config.get((String) item.getKey())); dumpGenerator.writeBooleanField("isFinal", config.finalParameters.contains(item.getKey())); String[] resources = config.updatingResource.get(item.getKey()); String resource = UNKNOWN_RESOURCE; if(resources != null && resources.length > 0) { resource = resources[0]; } dumpGenerator.writeStringField("resource", resource); dumpGenerator.writeEndObject(); } } dumpGenerator.writeEndArray(); dumpGenerator.writeEndObject(); dumpGenerator.flush(); } /** * Get the {@link ClassLoader} for this job. * * @return the correct class loader. */ public ClassLoader getClassLoader() { return classLoader; } /** * Set the class loader that will be used to load the various objects. * * @param classLoader the new class loader. */ public void setClassLoader(ClassLoader classLoader) { this.classLoader = classLoader; } @Override public String toString() { StringBuilder sb = new StringBuilder(); sb.append("Configuration: "); if(loadDefaults) { toString(defaultResources, sb); if(resources.size()>0) { sb.append(", "); } } toString(resources, sb); return sb.toString(); } private void toString(List resources, StringBuilder sb) { ListIterator i = resources.listIterator(); while (i.hasNext()) { if (i.nextIndex() != 0) { sb.append(", "); } sb.append(i.next()); } } /** * Set the quietness-mode. * * In the quiet-mode, error and informational messages might not be logged. * * @param quietmode true to set quiet-mode on, false * to turn it off. */ public synchronized void setQuietMode(boolean quietmode) { this.quietmode = quietmode; } synchronized boolean getQuietMode() { return this.quietmode; } /** For debugging. List non-default properties to the terminal and exit. */ public static void main(String[] args) throws Exception { new Configuration().writeXml(System.out); } @Override public void readFields(DataInput in) throws IOException { clear(); int size = WritableUtils.readVInt(in); for(int i=0; i < size; ++i) { String key = org.apache.hadoop.io.Text.readString(in); String value = org.apache.hadoop.io.Text.readString(in); set(key, value); String sources[] = WritableUtils.readCompressedStringArray(in); if(sources != null) { updatingResource.put(key, sources); } } } //@Override @Override public void write(DataOutput out) throws IOException { Properties props = getProps(); WritableUtils.writeVInt(out, props.size()); for(Map.Entry item: props.entrySet()) { org.apache.hadoop.io.Text.writeString(out, (String) item.getKey()); org.apache.hadoop.io.Text.writeString(out, (String) item.getValue()); WritableUtils.writeCompressedStringArray(out, updatingResource.get(item.getKey())); } } /** * get keys matching the the regex * @param regex * @return Map with matching keys */ public Map getValByRegex(String regex) { Pattern p = Pattern.compile(regex); Map result = new HashMap(); Matcher m; for(Map.Entry item: getProps().entrySet()) { if (item.getKey() instanceof String && item.getValue() instanceof String) { m = p.matcher((String)item.getKey()); if(m.find()) { // match result.put((String) item.getKey(), substituteVars(getProps().getProperty((String) item.getKey()))); } } } return result; } /** * A unique class which is used as a sentinel value in the caching * for getClassByName. {@see Configuration#getClassByNameOrNull(String)} */ private static abstract class NegativeCacheSentinel {} public static void dumpDeprecatedKeys() { DeprecationContext deprecations = deprecationContext.get(); for (Map.Entry entry : deprecations.getDeprecatedKeyMap().entrySet()) { StringBuilder newKeys = new StringBuilder(); for (String newKey : entry.getValue().newKeys) { newKeys.append(newKey).append("\t"); } System.out.println(entry.getKey() + "\t" + newKeys.toString()); } } /** * Returns whether or not a deprecated name has been warned. If the name is not * deprecated then always return false */ public static boolean hasWarnedDeprecation(String name) { DeprecationContext deprecations = deprecationContext.get(); if(deprecations.getDeprecatedKeyMap().containsKey(name)) { if(deprecations.getDeprecatedKeyMap().get(name).accessed.get()) { return true; } } return false; } }