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Apache Commons DBCP software implements Database Connection Pooling
/*
* 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.commons.dbcp2.datasources;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.util.ArrayList;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Properties;
import java.util.concurrent.ConcurrentHashMap;
import javax.naming.Context;
import javax.naming.Name;
import javax.naming.RefAddr;
import javax.naming.Reference;
import javax.naming.spi.ObjectFactory;
import org.apache.commons.dbcp2.ListException;
/**
* A JNDI ObjectFactory which creates SharedPoolDataSources or PerUserPoolDataSources
*
* @since 2.0
*/
abstract class InstanceKeyDataSourceFactory implements ObjectFactory {
private static final Map instanceMap = new ConcurrentHashMap<>();
static synchronized String registerNewInstance(final InstanceKeyDataSource ds) {
int max = 0;
final Iterator iterator = instanceMap.keySet().iterator();
while (iterator.hasNext()) {
final String s = iterator.next();
if (s != null) {
try {
max = Math.max(max, Integer.parseInt(s));
} catch (final NumberFormatException e) {
// no sweat, ignore those keys
}
}
}
final String instanceKey = String.valueOf(max + 1);
// Put a placeholder here for now, so other instances will not
// take our key. We will replace with a pool when ready.
instanceMap.put(instanceKey, ds);
return instanceKey;
}
static void removeInstance(final String key) {
if (key != null) {
instanceMap.remove(key);
}
}
/**
* Closes all pools associated with this class.
*
* @throws Exception
* a {@link ListException} containing all exceptions thrown by {@link InstanceKeyDataSource#close()}
* @see InstanceKeyDataSource#close()
* @see ListException
* @since 2.4.0 throws a {@link ListException} instead of, in 2.3.0 and before, the first exception thrown by
* {@link InstanceKeyDataSource#close()}.
*/
public static void closeAll() throws Exception {
// Get iterator to loop over all instances of this data source.
final List exceptionList = new ArrayList<>(instanceMap.size());
final Iterator> instanceIterator = instanceMap.entrySet().iterator();
while (instanceIterator.hasNext()) {
// Bullet-proof to avoid anything else but problems from InstanceKeyDataSource#close().
final Entry next = instanceIterator.next();
if (next != null) {
@SuppressWarnings("resource")
final InstanceKeyDataSource value = next.getValue();
if (value != null) {
try {
value.close();
} catch (final Exception e) {
exceptionList.add(e);
}
}
}
}
instanceMap.clear();
if (!exceptionList.isEmpty()) {
throw new ListException("Could not close all InstanceKeyDataSource instances.", exceptionList);
}
}
/**
* Implements ObjectFactory to create an instance of SharedPoolDataSource or PerUserPoolDataSource
*/
@Override
public Object getObjectInstance(final Object refObj, final Name name, final Context context,
final Hashtable env) throws IOException, ClassNotFoundException {
// The spec says to return null if we can't create an instance
// of the reference
Object obj = null;
if (refObj instanceof Reference) {
final Reference ref = (Reference) refObj;
if (isCorrectClass(ref.getClassName())) {
final RefAddr refAddr = ref.get("instanceKey");
if (refAddr != null && refAddr.getContent() != null) {
// object was bound to jndi via Referenceable api.
obj = instanceMap.get(refAddr.getContent());
} else {
// Tomcat JNDI creates a Reference out of server.xml
// configuration and passes it to an
// instance of the factory given in server.xml.
String key = null;
if (name != null) {
key = name.toString();
obj = instanceMap.get(key);
}
if (obj == null) {
final InstanceKeyDataSource ds = getNewInstance(ref);
setCommonProperties(ref, ds);
obj = ds;
if (key != null) {
instanceMap.put(key, ds);
}
}
}
}
}
return obj;
}
private void setCommonProperties(final Reference ref, final InstanceKeyDataSource ikds)
throws IOException, ClassNotFoundException {
RefAddr refAddr = ref.get("dataSourceName");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setDataSourceName(refAddr.getContent().toString());
}
refAddr = ref.get("description");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setDescription(refAddr.getContent().toString());
}
refAddr = ref.get("jndiEnvironment");
if (refAddr != null && refAddr.getContent() != null) {
final byte[] serialized = (byte[]) refAddr.getContent();
ikds.setJndiEnvironment((Properties) deserialize(serialized));
}
refAddr = ref.get("loginTimeout");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setLoginTimeout(Integer.parseInt(refAddr.getContent().toString()));
}
// Pool properties
refAddr = ref.get("blockWhenExhausted");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setDefaultBlockWhenExhausted(Boolean.valueOf(refAddr.getContent().toString()).booleanValue());
}
refAddr = ref.get("evictionPolicyClassName");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setDefaultEvictionPolicyClassName(refAddr.getContent().toString());
}
// Pool properties
refAddr = ref.get("lifo");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setDefaultLifo(Boolean.valueOf(refAddr.getContent().toString()).booleanValue());
}
refAddr = ref.get("maxIdlePerKey");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setDefaultMaxIdle(Integer.parseInt(refAddr.getContent().toString()));
}
refAddr = ref.get("maxTotalPerKey");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setDefaultMaxTotal(Integer.parseInt(refAddr.getContent().toString()));
}
refAddr = ref.get("maxWaitMillis");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setDefaultMaxWaitMillis(Long.parseLong(refAddr.getContent().toString()));
}
refAddr = ref.get("minEvictableIdleTimeMillis");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setDefaultMinEvictableIdleTimeMillis(Long.parseLong(refAddr.getContent().toString()));
}
refAddr = ref.get("minIdlePerKey");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setDefaultMinIdle(Integer.parseInt(refAddr.getContent().toString()));
}
refAddr = ref.get("numTestsPerEvictionRun");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setDefaultNumTestsPerEvictionRun(Integer.parseInt(refAddr.getContent().toString()));
}
refAddr = ref.get("softMinEvictableIdleTimeMillis");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setDefaultSoftMinEvictableIdleTimeMillis(Long.parseLong(refAddr.getContent().toString()));
}
refAddr = ref.get("testOnCreate");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setDefaultTestOnCreate(Boolean.valueOf(refAddr.getContent().toString()).booleanValue());
}
refAddr = ref.get("testOnBorrow");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setDefaultTestOnBorrow(Boolean.valueOf(refAddr.getContent().toString()).booleanValue());
}
refAddr = ref.get("testOnReturn");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setDefaultTestOnReturn(Boolean.valueOf(refAddr.getContent().toString()).booleanValue());
}
refAddr = ref.get("testWhileIdle");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setDefaultTestWhileIdle(Boolean.valueOf(refAddr.getContent().toString()).booleanValue());
}
refAddr = ref.get("timeBetweenEvictionRunsMillis");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setDefaultTimeBetweenEvictionRunsMillis(Long.parseLong(refAddr.getContent().toString()));
}
// Connection factory properties
refAddr = ref.get("validationQuery");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setValidationQuery(refAddr.getContent().toString());
}
refAddr = ref.get("validationQueryTimeout");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setValidationQueryTimeout(Integer.parseInt(refAddr.getContent().toString()));
}
refAddr = ref.get("rollbackAfterValidation");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setRollbackAfterValidation(Boolean.valueOf(refAddr.getContent().toString()).booleanValue());
}
refAddr = ref.get("maxConnLifetimeMillis");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setMaxConnLifetimeMillis(Long.parseLong(refAddr.getContent().toString()));
}
// Connection properties
refAddr = ref.get("defaultAutoCommit");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setDefaultAutoCommit(Boolean.valueOf(refAddr.getContent().toString()));
}
refAddr = ref.get("defaultTransactionIsolation");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setDefaultTransactionIsolation(Integer.parseInt(refAddr.getContent().toString()));
}
refAddr = ref.get("defaultReadOnly");
if (refAddr != null && refAddr.getContent() != null) {
ikds.setDefaultReadOnly(Boolean.valueOf(refAddr.getContent().toString()));
}
}
/**
* @param className
* The class name to test.
*
* @return true if and only if className is the value returned from getClass().getName().toString()
*/
protected abstract boolean isCorrectClass(String className);
/**
* Creates an instance of the subclass and sets any properties contained in the Reference.
*
* @param ref
* The properties to be set on the created DataSource
*
* @return A configured DataSource of the appropriate type.
*
* @throws ClassNotFoundException
* If a class cannot be found during the deserialization of a configuration parameter.
* @throws IOException
* If an I/O error occurs during the deserialization of a configuration parameter.
*/
protected abstract InstanceKeyDataSource getNewInstance(Reference ref) throws IOException, ClassNotFoundException;
/**
* Deserializes the provided byte array to create an object.
*
* @param data
* Data to deserialize to create the configuration parameter.
*
* @return The Object created by deserializing the data.
*
* @throws ClassNotFoundException
* If a class cannot be found during the deserialization of a configuration parameter.
* @throws IOException
* If an I/O error occurs during the deserialization of a configuration parameter.
*/
protected static final Object deserialize(final byte[] data) throws IOException, ClassNotFoundException {
ObjectInputStream in = null;
try {
in = new ObjectInputStream(new ByteArrayInputStream(data));
return in.readObject();
} finally {
if (in != null) {
try {
in.close();
} catch (final IOException ex) {
// ignore
}
}
}
}
}