org.apache.tomcat.util.modeler.Registry Maven / Gradle / Ivy
/*
* 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.tomcat.util.modeler;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.lang.management.ManagementFactory;
import java.net.URL;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.List;
import java.util.Map;
import javax.management.DynamicMBean;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanAttributeInfo;
import javax.management.MBeanInfo;
import javax.management.MBeanOperationInfo;
import javax.management.MBeanRegistration;
import javax.management.MBeanServer;
import javax.management.MBeanServerFactory;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.modeler.modules.ModelerSource;
import org.apache.tomcat.util.res.StringManager;
/**
* Registry for modeler MBeans.
*
* This is the main entry point into modeler. It provides methods to create and
* manipulate model mbeans and simplify their use.
*
* This class is itself an mbean.
*
* @author Craig R. McClanahan
* @author Costin Manolache
*/
public class Registry implements RegistryMBean, MBeanRegistration {
/**
* The Log instance to which we will write our log messages.
*/
private static final Log log = LogFactory.getLog(Registry.class);
private static final StringManager sm = StringManager.getManager(Registry.class);
// Support for the factory methods
/**
* The registry instance created by our factory method the first time it is
* called.
*/
private static Registry registry = null;
// Per registry fields
/**
* The MBeanServer instance that we will use to register
* management beans.
*/
private volatile MBeanServer server = null;
private final Object serverLock = new Object();
/**
* The set of ManagedBean instances for the beans this registry knows about,
* keyed by name.
*/
private Map descriptors = new HashMap<>();
/**
* List of managed beans, keyed by class name
*/
private Map descriptorsByClass = new HashMap<>();
// map to avoid duplicated searching or loading descriptors
private Map searchedPaths = new HashMap<>();
private Object guard;
// Id - small ints to use array access. No reset on stop()
// Used for notifications
private final Hashtable> idDomains = new Hashtable<>();
private final Hashtable ids = new Hashtable<>();
// ----------------------------------------------------------- Constructors
protected Registry() {
super();
}
// -------------------- Static methods --------------------
// Factories
/**
* Factory method to create (if necessary) and return our
* Registry instance.
*
* @param key Unused
* @param guard Prevent access to the registry by untrusted components
*
* @return the registry
* @since 1.1
*/
public static synchronized Registry getRegistry(Object key, Object guard) {
if (registry == null) {
registry = new Registry();
registry.guard = guard;
}
if (registry.guard != null && registry.guard != guard) {
return null;
}
return registry;
}
public static synchronized void disableRegistry() {
if (registry == null) {
registry = new NoDescriptorRegistry();
} else if (!(registry instanceof NoDescriptorRegistry)) {
log.warn(sm.getString("registry.noDisable"));
}
}
// -------------------- Generic methods --------------------
/**
* Lifecycle method - clean up the registry metadata. Called from
* resetMetadata().
*
* @since 1.1
*/
@Override
public void stop() {
descriptorsByClass = new HashMap<>();
descriptors = new HashMap<>();
searchedPaths = new HashMap<>();
}
/**
* Register a bean by creating a modeler mbean and adding it to the
* MBeanServer.
*
* If metadata is not loaded, we'll look up and read a file named
* "mbeans-descriptors.ser" or "mbeans-descriptors.xml" in the same package
* or parent.
*
* If the bean is an instance of DynamicMBean. it's metadata will be
* converted to a model mbean and we'll wrap it - so modeler services will
* be supported
*
* If the metadata is still not found, introspection will be used to extract
* it automatically.
*
* If an mbean is already registered under this name, it'll be first
* unregistered.
*
* If the component implements MBeanRegistration, the methods will be
* called. If the method has a method "setRegistry" that takes a
* RegistryMBean as parameter, it'll be called with the current registry.
*
*
* @param bean Object to be registered
* @param oname Name used for registration
* @param type The type of the mbean, as declared in mbeans-descriptors. If
* null, the name of the class will be used. This can be used as
* a hint or by subclasses.
* @throws Exception if a registration error occurred
* @since 1.1
*/
@Override
public void registerComponent(Object bean, String oname, String type) throws Exception {
registerComponent(bean, new ObjectName(oname), type);
}
/**
* Unregister a component. We'll first check if it is registered, and mask
* all errors. This is mostly a helper.
*
* @param oname Name used for unregistration
*
* @since 1.1
*/
@Override
public void unregisterComponent(String oname) {
try {
unregisterComponent(new ObjectName(oname));
} catch (MalformedObjectNameException e) {
log.info(sm.getString("registry.objectNameCreateError"), e);
}
}
/**
* Invoke a operation on a list of mbeans. Can be used to implement
* lifecycle operations.
*
* @param mbeans list of ObjectName on which we'll invoke the operations
* @param operation Name of the operation ( init, start, stop, etc)
* @param failFirst If false, exceptions will be ignored
* @throws Exception Error invoking operation
* @since 1.1
*/
@Override
public void invoke(List mbeans, String operation, boolean failFirst)
throws Exception {
if (mbeans == null) {
return;
}
for (ObjectName current : mbeans) {
try {
if (current == null) {
continue;
}
if (getMethodInfo(current, operation) == null) {
continue;
}
getMBeanServer().invoke(current, operation, new Object[] {}, new String[] {});
} catch (Exception t) {
if (failFirst) {
throw t;
}
log.info(sm.getString("registry.initError"), t);
}
}
}
// -------------------- ID registry --------------------
/**
* Return an int ID for faster access. Will be used for notifications and
* for other operations we want to optimize.
*
* @param domain Namespace
* @param name Type of the notification
* @return A unique id for the domain:name combination
* @since 1.1
*/
@Override
public synchronized int getId(String domain, String name) {
if (domain == null) {
domain = "";
}
Hashtable domainTable = idDomains.computeIfAbsent(domain, k -> new Hashtable<>());
if (name == null) {
name = "";
}
Integer i = domainTable.get(name);
if (i != null) {
return i.intValue();
}
int[] id = ids.computeIfAbsent(domain, k -> new int[1]);
int code = id[0]++;
domainTable.put(name, Integer.valueOf(code));
return code;
}
// -------------------- Metadata --------------------
// methods from 1.0
/**
* Add a new bean metadata to the set of beans known to this registry. This
* is used by internal components.
*
* @param bean The managed bean to be added
* @since 1.0
*/
public void addManagedBean(ManagedBean bean) {
// XXX Use group + name
descriptors.put(bean.getName(), bean);
if (bean.getType() != null) {
descriptorsByClass.put(bean.getType(), bean);
}
}
/**
* Find and return the managed bean definition for the specified bean name,
* if any; otherwise return null.
*
* @param name Name of the managed bean to be returned. Since 1.1, both
* short names or the full name of the class can be used.
* @return the managed bean
* @since 1.0
*/
public ManagedBean findManagedBean(String name) {
// XXX Group ?? Use Group + Type
ManagedBean mb = descriptors.get(name);
if (mb == null) {
mb = descriptorsByClass.get(name);
}
return mb;
}
// -------------------- Helpers --------------------
/**
* Get the type of an attribute of the object, from the metadata.
*
* @param oname The bean name
* @param attName The attribute name
* @return null if metadata about the attribute is not found
* @since 1.1
*/
public String getType(ObjectName oname, String attName) {
String type = null;
MBeanInfo info = null;
try {
info = getMBeanServer().getMBeanInfo(oname);
} catch (Exception e) {
log.info(sm.getString("registry.noMetadata", oname));
return null;
}
MBeanAttributeInfo attInfo[] = info.getAttributes();
for (MBeanAttributeInfo mBeanAttributeInfo : attInfo) {
if (attName.equals(mBeanAttributeInfo.getName())) {
type = mBeanAttributeInfo.getType();
return type;
}
}
return null;
}
/**
* Find the operation info for a method
*
* @param oname The bean name
* @param opName The operation name
* @return the operation info for the specified operation
*/
public MBeanOperationInfo getMethodInfo(ObjectName oname, String opName) {
MBeanInfo info = null;
try {
info = getMBeanServer().getMBeanInfo(oname);
} catch (Exception e) {
log.info(sm.getString("registry.noMetadata", oname));
return null;
}
MBeanOperationInfo attInfo[] = info.getOperations();
for (MBeanOperationInfo mBeanOperationInfo : attInfo) {
if (opName.equals(mBeanOperationInfo.getName())) {
return mBeanOperationInfo;
}
}
return null;
}
/**
* Find the operation info for a method.
*
* @param oname The bean name
* @param opName The operation name
* @param argCount The number of arguments to the method
* @return the operation info for the specified operation
* @throws InstanceNotFoundException If the object name is not bound to an MBean
*/
public MBeanOperationInfo getMethodInfo(ObjectName oname, String opName, int argCount)
throws InstanceNotFoundException
{
MBeanInfo info = null;
try {
info = getMBeanServer().getMBeanInfo(oname);
} catch (InstanceNotFoundException infe) {
throw infe;
} catch (Exception e) {
log.warn(sm.getString("registry.noMetadata", oname), e);
return null;
}
MBeanOperationInfo attInfo[] = info.getOperations();
for (MBeanOperationInfo mBeanOperationInfo : attInfo) {
if (opName.equals(mBeanOperationInfo.getName())
&& argCount == mBeanOperationInfo.getSignature().length) {
return mBeanOperationInfo;
}
}
return null;
}
/**
* Unregister a component. This is just a helper that avoids exceptions by
* checking if the mbean is already registered
*
* @param oname The bean name
*/
public void unregisterComponent(ObjectName oname) {
try {
if (oname != null && getMBeanServer().isRegistered(oname)) {
getMBeanServer().unregisterMBean(oname);
}
} catch (Throwable t) {
log.error(sm.getString("registry.unregisterError"), t);
}
}
/**
* Factory method to create (if necessary) and return our
* MBeanServer instance.
*
* @return the MBean server
*/
public MBeanServer getMBeanServer() {
if (server == null) {
synchronized (serverLock) {
if (server == null) {
if (MBeanServerFactory.findMBeanServer(null).size() > 0) {
server = MBeanServerFactory.findMBeanServer(null).get(0);
if (log.isDebugEnabled()) {
log.debug(sm.getString("registry.existingServer"));
}
} else {
server = ManagementFactory.getPlatformMBeanServer();
if (log.isDebugEnabled()) {
log.debug(sm.getString("registry.createdServer"));
}
}
}
}
}
return server;
}
/**
* Find or load metadata.
*
* @param bean The bean
* @param beanClass The bean class
* @param type The registry type
* @return the managed bean
* @throws Exception An error occurred
*/
public ManagedBean findManagedBean(Object bean, Class beanClass, String type)
throws Exception {
if (bean != null && beanClass == null) {
beanClass = bean.getClass();
}
if (type == null) {
type = beanClass.getName();
}
// first look for existing descriptor
ManagedBean managed = findManagedBean(type);
// Search for a descriptor in the same package
if (managed == null) {
// check package and parent packages
if (log.isTraceEnabled()) {
log.trace("Looking for descriptor ");
}
findDescriptor(beanClass, type);
managed = findManagedBean(type);
}
// Still not found - use introspection
if (managed == null) {
if (log.isTraceEnabled()) {
log.trace("Introspecting ");
}
// introspection
load("MbeansDescriptorsIntrospectionSource", beanClass, type);
managed = findManagedBean(type);
if (managed == null) {
log.warn(sm.getString("registry.noTypeMetadata", type));
return null;
}
managed.setName(type);
addManagedBean(managed);
}
return managed;
}
/**
* Convert a string to object, based on type. Used by several
* components. We could provide some pluggability. It is here to keep things
* consistent and avoid duplication in other tasks
*
* @param type Fully qualified class name of the resulting value
* @param value String value to be converted
* @return Converted value
*/
public Object convertValue(String type, String value) {
Object objValue = value;
if (type == null || "java.lang.String".equals(type)) {
// string is default
objValue = value;
} else if ("javax.management.ObjectName".equals(type) || "ObjectName".equals(type)) {
try {
objValue = new ObjectName(value);
} catch (MalformedObjectNameException e) {
return null;
}
} else if ("java.lang.Integer".equals(type) || "int".equals(type)) {
objValue = Integer.valueOf(value);
} else if ("java.lang.Long".equals(type) || "long".equals(type)) {
objValue = Long.valueOf(value);
} else if ("java.lang.Boolean".equals(type) || "boolean".equals(type)) {
objValue = Boolean.valueOf(value);
}
return objValue;
}
/**
* Load descriptors.
*
* @param sourceType The source type
* @param source The bean
* @param param A type to load
* @return List of descriptors
* @throws Exception Error loading descriptors
*/
public List load(String sourceType, Object source, String param) throws Exception {
if (log.isTraceEnabled()) {
log.trace("load " + source);
}
String location = null;
String type = null;
Object inputsource = null;
if (source instanceof URL) {
URL url = (URL) source;
location = url.toString();
type = param;
inputsource = url.openStream();
if (sourceType == null && location.endsWith(".xml")) {
sourceType = "MbeansDescriptorsDigesterSource";
}
} else if (source instanceof File) {
location = ((File) source).getAbsolutePath();
inputsource = new FileInputStream((File) source);
type = param;
if (sourceType == null && location.endsWith(".xml")) {
sourceType = "MbeansDescriptorsDigesterSource";
}
} else if (source instanceof InputStream) {
type = param;
inputsource = source;
} else if (source instanceof Class) {
location = ((Class) source).getName();
type = param;
inputsource = source;
if (sourceType == null) {
sourceType = "MbeansDescriptorsIntrospectionSource";
}
} else {
throw new IllegalArgumentException(sm.getString("registry.invalidSource"));
}
if (sourceType == null) {
sourceType = "MbeansDescriptorsDigesterSource";
}
ModelerSource ds = getModelerSource(sourceType);
List mbeans = ds.loadDescriptors(this, type, inputsource);
return mbeans;
}
/**
* Register a component
*
* @param bean The bean
* @param oname The object name
* @param type The registry type
* @throws Exception Error registering component
*/
public void registerComponent(Object bean, ObjectName oname, String type) throws Exception {
if (log.isTraceEnabled()) {
log.trace("Managed= " + oname);
}
if (bean == null) {
log.error(sm.getString("registry.nullBean", oname));
return;
}
try {
if (type == null) {
type = bean.getClass().getName();
}
ManagedBean managed = findManagedBean(null, bean.getClass(), type);
// The real mbean is created and registered
DynamicMBean mbean = managed.createMBean(bean);
if (getMBeanServer().isRegistered(oname)) {
if (log.isDebugEnabled()) {
log.debug(sm.getString("registry.unregisterExisting", oname));
}
getMBeanServer().unregisterMBean(oname);
}
getMBeanServer().registerMBean(mbean, oname);
} catch (Exception ex) {
log.error(sm.getString("registry.registerError", oname), ex);
throw ex;
}
}
/**
* Lookup the component descriptor in the package and in the parent
* packages.
*
* @param packageName The package name
* @param classLoader The class loader
*/
public void loadDescriptors(String packageName, ClassLoader classLoader) {
String res = packageName.replace('.', '/');
if (log.isTraceEnabled()) {
log.trace("Finding descriptor " + res);
}
if (searchedPaths.get(packageName) != null) {
return;
}
String descriptors = res + "/mbeans-descriptors.xml";
URL dURL = classLoader.getResource(descriptors);
if (dURL == null) {
return;
}
if (log.isTraceEnabled()) {
log.trace("Found " + dURL);
}
searchedPaths.put(packageName, dURL);
try {
load("MbeansDescriptorsDigesterSource", dURL, null);
} catch (Exception ex) {
log.error(sm.getString("registry.loadError", dURL));
}
}
/**
* Lookup the component descriptor in the package and in the parent
* packages.
*/
private void findDescriptor(Class beanClass, String type) {
if (type == null) {
type = beanClass.getName();
}
ClassLoader classLoader = null;
if (beanClass != null) {
classLoader = beanClass.getClassLoader();
}
if (classLoader == null) {
classLoader = Thread.currentThread().getContextClassLoader();
}
if (classLoader == null) {
classLoader = this.getClass().getClassLoader();
}
String className = type;
String pkg = className;
while (pkg.indexOf('.') > 0) {
int lastComp = pkg.lastIndexOf('.');
if (lastComp <= 0) {
return;
}
pkg = pkg.substring(0, lastComp);
if (searchedPaths.get(pkg) != null) {
return;
}
loadDescriptors(pkg, classLoader);
}
}
private ModelerSource getModelerSource(String type) throws Exception {
if (type == null) {
type = "MbeansDescriptorsDigesterSource";
}
if (!type.contains(".")) {
type = "org.apache.tomcat.util.modeler.modules." + type;
}
Class c = Class.forName(type);
ModelerSource ds = (ModelerSource) c.getConstructor().newInstance();
return ds;
}
// -------------------- Registration --------------------
@Override
public ObjectName preRegister(MBeanServer server, ObjectName name) throws Exception {
synchronized (serverLock) {
this.server = server;
}
return name;
}
@Override
public void postRegister(Boolean registrationDone) {
}
@Override
public void preDeregister() throws Exception {
}
@Override
public void postDeregister() {
}
}
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