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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.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Collections;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import javax.sql.ConnectionEvent;
import javax.sql.ConnectionEventListener;
import javax.sql.ConnectionPoolDataSource;
import javax.sql.PooledConnection;
import org.apache.commons.dbcp2.Utils;
import org.apache.commons.pool2.ObjectPool;
import org.apache.commons.pool2.PooledObject;
import org.apache.commons.pool2.PooledObjectFactory;
import org.apache.commons.pool2.impl.DefaultPooledObject;
/**
* A {@link PooledObjectFactory} that creates
* {@link org.apache.commons.dbcp2.PoolableConnection PoolableConnection}s.
*
* @author John D. McNally
* @version $Revision: 1572242 $ $Date: 2014-02-26 12:34:39 -0800 (Wed, 26 Feb 2014) $
* @since 2.0
*/
class CPDSConnectionFactory
implements PooledObjectFactory,
ConnectionEventListener, PooledConnectionManager {
private static final String NO_KEY_MESSAGE
= "close() was called on a Connection, but "
+ "I have no record of the underlying PooledConnection.";
private final ConnectionPoolDataSource _cpds;
private final String _validationQuery;
private final int _validationQueryTimeout;
private final boolean _rollbackAfterValidation;
private ObjectPool _pool;
private final String _username;
private String _password = null;
private long maxConnLifetimeMillis = -1;
/**
* Map of PooledConnections for which close events are ignored.
* Connections are muted when they are being validated.
*/
private final Set validatingSet =
Collections.newSetFromMap(new ConcurrentHashMap());
/**
* Map of PooledConnectionAndInfo instances
*/
private final Map pcMap =
new ConcurrentHashMap<>();
/**
* Create a new PoolableConnectionFactory.
*
* @param cpds the ConnectionPoolDataSource from which to obtain
* PooledConnection's
* @param validationQuery a query to use to {@link #validateObject
* validate} {@link Connection}s. Should return at least one row.
* May be null in which case {@link Connection#isValid(int)} will
* be used to validate connections.
* @param validationQueryTimeout Timeout in seconds before validation fails
* @param rollbackAfterValidation whether a rollback should be issued
* after {@link #validateObject validating} {@link Connection}s.
* @param username
* @param password
*/
public CPDSConnectionFactory(ConnectionPoolDataSource cpds,
String validationQuery,
int validationQueryTimeout,
boolean rollbackAfterValidation,
String username,
String password) {
_cpds = cpds;
_validationQuery = validationQuery;
_validationQueryTimeout = validationQueryTimeout;
_username = username;
_password = password;
_rollbackAfterValidation = rollbackAfterValidation;
}
/**
* Returns the object pool used to pool connections created by this factory.
*
* @return ObjectPool managing pooled connections
*/
public ObjectPool getPool() {
return _pool;
}
/**
*
* @param pool the {@link ObjectPool} in which to pool those {@link
* Connection}s
*/
public void setPool(ObjectPool pool) {
this._pool = pool;
}
@Override
public synchronized PooledObject makeObject() {
PooledConnectionAndInfo pci;
try {
PooledConnection pc = null;
if (_username == null) {
pc = _cpds.getPooledConnection();
} else {
pc = _cpds.getPooledConnection(_username, _password);
}
if (pc == null) {
throw new IllegalStateException("Connection pool data source returned null from getPooledConnection");
}
// should we add this object as a listener or the pool.
// consider the validateObject method in decision
pc.addConnectionEventListener(this);
pci = new PooledConnectionAndInfo(pc, _username, _password);
pcMap.put(pc, pci);
} catch (SQLException e) {
throw new RuntimeException(e.getMessage());
}
return new DefaultPooledObject<>(pci);
}
/**
* Closes the PooledConnection and stops listening for events from it.
*/
@Override
public void destroyObject(PooledObject p) throws Exception {
doDestroyObject(p.getObject());
}
private void doDestroyObject(PooledConnectionAndInfo pci) throws Exception{
PooledConnection pc = pci.getPooledConnection();
pc.removeConnectionEventListener(this);
pcMap.remove(pc);
pc.close();
}
@Override
public boolean validateObject(PooledObject p) {
try {
validateLifetime(p);
} catch (Exception e) {
return false;
}
boolean valid = false;
PooledConnection pconn = p.getObject().getPooledConnection();
if (null == _validationQuery) {
int timeout = _validationQueryTimeout;
if (timeout < 0) {
timeout = 0;
}
try {
valid = pconn.getConnection().isValid(timeout);
} catch (SQLException e) {
valid = false;
}
} else {
Connection conn = null;
Statement stmt = null;
ResultSet rset = null;
// logical Connection from the PooledConnection must be closed
// before another one can be requested and closing it will
// generate an event. Keep track so we know not to return
// the PooledConnection
validatingSet.add(pconn);
try {
conn = pconn.getConnection();
stmt = conn.createStatement();
rset = stmt.executeQuery(_validationQuery);
if (rset.next()) {
valid = true;
} else {
valid = false;
}
if (_rollbackAfterValidation) {
conn.rollback();
}
} catch (Exception e) {
valid = false;
} finally {
Utils.closeQuietly(rset);
Utils.closeQuietly(stmt);
Utils.closeQuietly(conn);
validatingSet.remove(pconn);
}
}
return valid;
}
@Override
public void passivateObject(PooledObject p)
throws Exception {
validateLifetime(p);
}
@Override
public void activateObject(PooledObject p)
throws Exception {
validateLifetime(p);
}
// ***********************************************************************
// java.sql.ConnectionEventListener implementation
// ***********************************************************************
/**
* This will be called if the Connection returned by the getConnection
* method came from a PooledConnection, and the user calls the close()
* method of this connection object. What we need to do here is to
* release this PooledConnection from our pool...
*/
@Override
public void connectionClosed(ConnectionEvent event) {
PooledConnection pc = (PooledConnection) event.getSource();
// if this event occurred because we were validating, ignore it
// otherwise return the connection to the pool.
if (!validatingSet.contains(pc)) {
PooledConnectionAndInfo pci = pcMap.get(pc);
if (pci == null) {
throw new IllegalStateException(NO_KEY_MESSAGE);
}
try {
_pool.returnObject(pci);
} catch (Exception e) {
System.err.println("CLOSING DOWN CONNECTION AS IT COULD "
+ "NOT BE RETURNED TO THE POOL");
pc.removeConnectionEventListener(this);
try {
doDestroyObject(pci);
} catch (Exception e2) {
System.err.println("EXCEPTION WHILE DESTROYING OBJECT "
+ pci);
e2.printStackTrace();
}
}
}
}
/**
* If a fatal error occurs, close the underlying physical connection so as
* not to be returned in the future
*/
@Override
public void connectionErrorOccurred(ConnectionEvent event) {
PooledConnection pc = (PooledConnection)event.getSource();
if (null != event.getSQLException()) {
System.err.println(
"CLOSING DOWN CONNECTION DUE TO INTERNAL ERROR ("
+ event.getSQLException() + ")");
}
pc.removeConnectionEventListener(this);
PooledConnectionAndInfo pci = pcMap.get(pc);
if (pci == null) {
throw new IllegalStateException(NO_KEY_MESSAGE);
}
try {
_pool.invalidateObject(pci);
} catch (Exception e) {
System.err.println("EXCEPTION WHILE DESTROYING OBJECT " + pci);
e.printStackTrace();
}
}
// ***********************************************************************
// PooledConnectionManager implementation
// ***********************************************************************
/**
* Invalidates the PooledConnection in the pool. The CPDSConnectionFactory
* closes the connection and pool counters are updated appropriately.
* Also closes the pool. This ensures that all idle connections are closed
* and connections that are checked out are closed on return.
*/
@Override
public void invalidate(PooledConnection pc) throws SQLException {
PooledConnectionAndInfo pci = pcMap.get(pc);
if (pci == null) {
throw new IllegalStateException(NO_KEY_MESSAGE);
}
try {
_pool.invalidateObject(pci); // Destroy instance and update pool counters
_pool.close(); // Clear any other instances in this pool and kill others as they come back
} catch (Exception ex) {
throw new SQLException("Error invalidating connection", ex);
}
}
/**
* Sets the database password used when creating new connections.
*
* @param password new password
*/
@Override
public synchronized void setPassword(String password) {
_password = password;
}
/**
* Sets the maximum lifetime in milliseconds of a connection after which the
* connection will always fail activation, passivation and validation. A
* value of zero or less indicates an infinite lifetime. The default value
* is -1.
*/
public void setMaxConnLifetimeMillis(long maxConnLifetimeMillis) {
this.maxConnLifetimeMillis = maxConnLifetimeMillis;
}
/**
* Verifies that the username matches the user whose connections are being managed by this
* factory and closes the pool if this is the case; otherwise does nothing.
*/
@Override
public void closePool(String username) throws SQLException {
synchronized (this) {
if (username == null || !username.equals(_username)) {
return;
}
}
try {
_pool.close();
} catch (Exception ex) {
throw new SQLException("Error closing connection pool", ex);
}
}
private void validateLifetime(PooledObject p)
throws Exception {
if (maxConnLifetimeMillis > 0) {
long lifetime = System.currentTimeMillis() - p.getCreateTime();
if (lifetime > maxConnLifetimeMillis) {
throw new Exception(Utils.getMessage(
"connectionFactory.lifetimeExceeded",
Long.valueOf(lifetime),
Long.valueOf(maxConnLifetimeMillis)));
}
}
}
}