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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.KeyedObjectPool;
import org.apache.commons.pool2.KeyedPooledObjectFactory;
import org.apache.commons.pool2.PooledObject;
import org.apache.commons.pool2.impl.DefaultPooledObject;
/**
* A {@link KeyedPooledObjectFactory} that creates
* {@link org.apache.commons.dbcp2.PoolableConnection PoolableConnection}s.
*
* @author John D. McNally
* @since 2.0
*/
class KeyedCPDSConnectionFactory
implements KeyedPooledObjectFactory,
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 KeyedObjectPool _pool;
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 {@code KeyedPoolableConnectionFactory}.
* @param cpds the ConnectionPoolDataSource from which to obtain
* PooledConnections
* @param validationQuery a query to use to {@link #validateObject validate}
* {@link Connection}s. Should return at least one row. May be
* {@code null} in which case3 {@link Connection#isValid(int)} will be used
* to validate connections.
* @param validationQueryTimeout The time, in seconds, to allow for the
* validation query to complete
* @param rollbackAfterValidation whether a rollback should be issued after
* {@link #validateObject validating} {@link Connection}s.
*/
public KeyedCPDSConnectionFactory(final ConnectionPoolDataSource cpds,
final String validationQuery,
final int validationQueryTimeout,
final boolean rollbackAfterValidation) {
_cpds = cpds;
_validationQuery = validationQuery;
_validationQueryTimeout = validationQueryTimeout;
_rollbackAfterValidation = rollbackAfterValidation;
}
public void setPool(final KeyedObjectPool pool) {
this._pool = pool;
}
/**
* Returns the keyed object pool used to pool connections created by this factory.
*
* @return KeyedObjectPool managing pooled connections
*/
public KeyedObjectPool getPool() {
return _pool;
}
/**
* Creates a new {@link PooledConnectionAndInfo} from the given {@link UserPassKey}.
*
* @param upkey {@link UserPassKey} containing user credentials
* @throws SQLException if the connection could not be created.
* @see org.apache.commons.pool2.KeyedPooledObjectFactory#makeObject(java.lang.Object)
*/
@Override
public synchronized PooledObject makeObject(final UserPassKey upkey)
throws Exception {
PooledConnectionAndInfo pci = null;
PooledConnection pc = null;
final String username = upkey.getUsername();
final String password = upkey.getPassword();
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);
return new DefaultPooledObject<>(pci);
}
/**
* Closes the PooledConnection and stops listening for events from it.
*/
@Override
public void destroyObject(final UserPassKey key, final PooledObject p)
throws Exception {
final PooledConnection pc = p.getObject().getPooledConnection();
pc.removeConnectionEventListener(this);
pcMap.remove(pc);
pc.close();
}
/**
* Validates a pooled connection.
*
* @param key ignored
* @param p wrapped {@link PooledConnectionAndInfo} containing the
* connection to validate
* @return true if validation succeeds
*/
@Override
public boolean validateObject(final UserPassKey key,
final PooledObject p) {
try {
validateLifetime(p);
} catch (final Exception e) {
return false;
}
boolean valid = false;
final PooledConnection pconn = p.getObject().getPooledConnection();
Connection conn = null;
validatingSet.add(pconn);
if (null == _validationQuery) {
int timeout = _validationQueryTimeout;
if (timeout < 0) {
timeout = 0;
}
try {
conn = pconn.getConnection();
valid = conn.isValid(timeout);
} catch (final SQLException e) {
valid = false;
} finally {
Utils.closeQuietly(conn);
validatingSet.remove(pconn);
}
} else {
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(final Exception e) {
valid = false;
} finally {
Utils.closeQuietly(rset);
Utils.closeQuietly(stmt);
Utils.closeQuietly(conn);
validatingSet.remove(pconn);
}
}
return valid;
}
@Override
public void passivateObject(final UserPassKey key,
final PooledObject p) throws Exception {
validateLifetime(p);
}
@Override
public void activateObject(final UserPassKey key,
final 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(final ConnectionEvent event) {
final PooledConnection pc = (PooledConnection)event.getSource();
// if this event occurred because we were validating, or if this
// connection has been marked for removal, ignore it
// otherwise return the connection to the pool.
if (!validatingSet.contains(pc)) {
final PooledConnectionAndInfo pci = pcMap.get(pc);
if (pci == null) {
throw new IllegalStateException(NO_KEY_MESSAGE);
}
try {
_pool.returnObject(pci.getUserPassKey(), pci);
} catch (final Exception e) {
System.err.println("CLOSING DOWN CONNECTION AS IT COULD " +
"NOT BE RETURNED TO THE POOL");
pc.removeConnectionEventListener(this);
try {
_pool.invalidateObject(pci.getUserPassKey(), pci);
} catch (final Exception e3) {
System.err.println("EXCEPTION WHILE DESTROYING OBJECT " +
pci);
e3.printStackTrace();
}
}
}
}
/**
* If a fatal error occurs, close the underlying physical connection so as
* not to be returned in the future
*/
@Override
public void connectionErrorOccurred(final ConnectionEvent event) {
final PooledConnection pc = (PooledConnection)event.getSource();
if (null != event.getSQLException()) {
System.err
.println("CLOSING DOWN CONNECTION DUE TO INTERNAL ERROR (" +
event.getSQLException() + ")");
}
pc.removeConnectionEventListener(this);
final PooledConnectionAndInfo info = pcMap.get(pc);
if (info == null) {
throw new IllegalStateException(NO_KEY_MESSAGE);
}
try {
_pool.invalidateObject(info.getUserPassKey(), info);
} catch (final Exception e) {
System.err.println("EXCEPTION WHILE DESTROYING OBJECT " + info);
e.printStackTrace();
}
}
// ***********************************************************************
// PooledConnectionManager implementation
// ***********************************************************************
/**
* Invalidates the PooledConnection in the pool. The KeyedCPDSConnectionFactory
* closes the connection and pool counters are updated appropriately.
* Also clears any idle instances associated with the username that was used
* to create the PooledConnection. Connections associated with this user
* are not affected and they will not be automatically closed on return to the pool.
*/
@Override
public void invalidate(final PooledConnection pc) throws SQLException {
final PooledConnectionAndInfo info = pcMap.get(pc);
if (info == null) {
throw new IllegalStateException(NO_KEY_MESSAGE);
}
final UserPassKey key = info.getUserPassKey();
try {
_pool.invalidateObject(key, info); // Destroy and update pool counters
_pool.clear(key); // Remove any idle instances with this key
} catch (final Exception ex) {
throw new SQLException("Error invalidating connection", ex);
}
}
/**
* Does nothing. This factory does not cache user credentials.
*/
@Override
public void setPassword(final String password) {
}
/**
* Sets the maximum lifetime in milliseconds of a connection after which the
* connection will always fail activation, passivation and validation.
*
* @param maxConnLifetimeMillis A value of zero or less indicates an
* infinite lifetime. The default value is -1.
*/
public void setMaxConnLifetimeMillis(final long maxConnLifetimeMillis) {
this.maxConnLifetimeMillis = maxConnLifetimeMillis;
}
/**
* This implementation does not fully close the KeyedObjectPool, as
* this would affect all users. Instead, it clears the pool associated
* with the given user. This method is not currently used.
*/
@Override
public void closePool(final String username) throws SQLException {
try {
_pool.clear(new UserPassKey(username, null));
} catch (final Exception ex) {
throw new SQLException("Error closing connection pool", ex);
}
}
private void validateLifetime(final PooledObject p)
throws Exception {
if (maxConnLifetimeMillis > 0) {
final long lifetime = System.currentTimeMillis() - p.getCreateTime();
if (lifetime > maxConnLifetimeMillis) {
throw new Exception(Utils.getMessage(
"connectionFactory.lifetimeExceeded",
Long.valueOf(lifetime),
Long.valueOf(maxConnLifetimeMillis)));
}
}
}
}