/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2009 Sun Microsystems, Inc.
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*/
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package org.opends.sdk;
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import java.util.Collection;
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import java.util.Stack;
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import java.util.concurrent.ConcurrentLinkedQueue;
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import java.util.logging.Level;
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import org.opends.sdk.requests.*;
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import org.opends.sdk.responses.*;
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import org.opends.sdk.schema.Schema;
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import com.sun.opends.sdk.util.AbstractFutureResult;
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import com.sun.opends.sdk.util.CompletedFutureResult;
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import com.sun.opends.sdk.util.FutureResultTransformer;
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import com.sun.opends.sdk.util.StaticUtils;
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/**
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* A simple connection pool implementation.
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*/
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final class ConnectionPool extends
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AbstractConnectionFactory<AsynchronousConnection>
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{
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private final ConnectionFactory<?> connectionFactory;
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private volatile int numConnections;
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private final int poolSize;
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// FIXME: should use a better collection than this - CLQ?
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private final Stack<AsynchronousConnection> pool;
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private final ConcurrentLinkedQueue<FuturePooledConnection> pendingFutures;
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private final Object lock = new Object();
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private final class FutureNewConnection
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extends
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FutureResultTransformer<AsynchronousConnection, AsynchronousConnection>
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{
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private FutureNewConnection(
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ResultHandler<? super AsynchronousConnection> handler)
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{
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super(handler);
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}
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protected AsynchronousConnection transformResult(
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AsynchronousConnection result) throws ErrorResultException
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{
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return new PooledConnectionWapper(result);
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}
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}
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private final class PooledConnectionWapper implements
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AsynchronousConnection, ConnectionEventListener
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{
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private AsynchronousConnection connection;
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private PooledConnectionWapper(AsynchronousConnection connection)
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{
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this.connection = connection;
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this.connection.addConnectionEventListener(this);
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}
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public void abandon(AbandonRequest request)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (connection == null)
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{
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throw new IllegalStateException();
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}
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connection.abandon(request);
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}
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public FutureResult<Result> add(AddRequest request,
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ResultHandler<Result> handler)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (connection == null)
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{
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throw new IllegalStateException();
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}
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return connection.add(request, handler);
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}
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public FutureResult<BindResult> bind(BindRequest request,
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ResultHandler<? super BindResult> handler)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (connection == null)
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{
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throw new IllegalStateException();
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}
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return connection.bind(request, handler);
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}
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public void close()
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{
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synchronized (lock)
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{
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try
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{
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// Don't put closed connections back in the pool.
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if (connection.isClosed())
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{
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if (StaticUtils.DEBUG_LOG.isLoggable(Level.FINE))
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{
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StaticUtils.DEBUG_LOG
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.finest(String
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.format(
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"Dead connection released to pool. "
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+ "numConnections: %d, poolSize: %d, pendingFutures: %d",
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numConnections, pool.size(), pendingFutures
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.size()));
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}
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return;
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}
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// See if there waiters pending.
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for (;;)
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{
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FuturePooledConnection future = pendingFutures.poll();
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if (future == null)
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{
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// No waiters - so drop out and add connection to pool.
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break;
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}
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PooledConnectionWapper pooledConnection = new PooledConnectionWapper(
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connection);
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future.handleResult(pooledConnection);
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if (!future.isCancelled())
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{
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// The future was not cancelled and the connection was
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// accepted.
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if (StaticUtils.DEBUG_LOG.isLoggable(Level.FINE))
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{
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StaticUtils.DEBUG_LOG
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.finest(String
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.format(
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"Connection released to pool and directly "
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+ "given to waiter. numConnections: %d, poolSize: %d, "
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+ "pendingFutures: %d", numConnections,
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pool.size(), pendingFutures.size()));
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}
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return;
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}
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}
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// No waiters. Put back in pool.
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pool.push(connection);
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if (StaticUtils.DEBUG_LOG.isLoggable(Level.FINE))
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{
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StaticUtils.DEBUG_LOG
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.finest(String
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.format(
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"Connection released to pool. "
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+ "numConnections: %d, poolSize: %d, pendingFutures: %d",
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numConnections, pool.size(), pendingFutures
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.size()));
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}
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}
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finally
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{
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// Null out the underlying connection to prevent further use.
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connection = null;
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}
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}
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}
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public void close(UnbindRequest request, String reason)
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throws NullPointerException
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{
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close();
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}
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public FutureResult<CompareResult> compare(CompareRequest request,
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ResultHandler<? super CompareResult> handler)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (connection == null)
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{
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throw new IllegalStateException();
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}
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return connection.compare(request, handler);
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}
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public FutureResult<Result> delete(DeleteRequest request,
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ResultHandler<Result> handler)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (connection == null)
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{
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throw new IllegalStateException();
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}
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return connection.delete(request, handler);
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}
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public <R extends Result> FutureResult<R> extendedRequest(
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ExtendedRequest<R> request, ResultHandler<? super R> handler)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (connection == null)
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{
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throw new IllegalStateException();
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}
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return connection.extendedRequest(request, handler);
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}
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public FutureResult<Result> modify(ModifyRequest request,
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ResultHandler<Result> handler)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (connection == null)
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{
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throw new IllegalStateException();
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}
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return connection.modify(request, handler);
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}
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public FutureResult<Result> modifyDN(ModifyDNRequest request,
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ResultHandler<Result> handler)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (connection == null)
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{
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throw new IllegalStateException();
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}
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return connection.modifyDN(request, handler);
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}
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public FutureResult<Result> search(SearchRequest request,
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ResultHandler<Result> resultHandler,
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SearchResultHandler searchResulthandler)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (connection == null)
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{
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throw new IllegalStateException();
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}
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return connection.search(request, resultHandler,
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searchResulthandler);
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}
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/**
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* {@inheritDoc}
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*/
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public FutureResult<SearchResultEntry> readEntry(DN name,
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Collection<String> attributeDescriptions,
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ResultHandler<? super SearchResultEntry> resultHandler)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (connection == null)
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{
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throw new IllegalStateException();
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}
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return connection.readEntry(name, attributeDescriptions,
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resultHandler);
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}
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/**
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* {@inheritDoc}
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*/
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public FutureResult<SearchResultEntry> searchSingleEntry(
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SearchRequest request,
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ResultHandler<? super SearchResultEntry> resultHandler)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (connection == null)
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{
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throw new IllegalStateException();
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}
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return connection.searchSingleEntry(request, resultHandler);
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}
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/**
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* {@inheritDoc}
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*/
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public FutureResult<RootDSE> readRootDSE(
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ResultHandler<RootDSE> handler)
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throws UnsupportedOperationException, IllegalStateException
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{
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if (connection == null)
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{
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throw new IllegalStateException();
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}
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return connection.readRootDSE(handler);
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}
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/**
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* {@inheritDoc}
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*/
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public FutureResult<Schema> readSchemaForEntry(DN name,
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ResultHandler<Schema> handler)
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throws UnsupportedOperationException, IllegalStateException
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{
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if (connection == null)
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{
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throw new IllegalStateException();
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}
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return connection.readSchemaForEntry(name, handler);
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}
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/**
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* {@inheritDoc}
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*/
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public FutureResult<Schema> readSchema(DN name,
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ResultHandler<Schema> handler)
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throws UnsupportedOperationException, IllegalStateException
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{
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if (connection == null)
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{
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throw new IllegalStateException();
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}
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return connection.readSchema(name, handler);
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}
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public void addConnectionEventListener(
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ConnectionEventListener listener) throws IllegalStateException,
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NullPointerException
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{
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if (connection == null)
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{
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throw new IllegalStateException();
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}
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}
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public void removeConnectionEventListener(
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ConnectionEventListener listener) throws NullPointerException
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{
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if (connection == null)
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{
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throw new IllegalStateException();
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}
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}
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/**
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* {@inheritDoc}
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*/
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public boolean isClosed()
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{
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return connection == null;
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}
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public void connectionReceivedUnsolicitedNotification(
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GenericExtendedResult notification)
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{
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// Ignore
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}
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public void connectionErrorOccurred(
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boolean isDisconnectNotification, ErrorResultException error)
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{
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synchronized (lock)
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{
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// Remove this connection from the pool if its in there
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pool.remove(this);
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numConnections--;
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connection.removeConnectionEventListener(this);
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// FIXME: should still close the connection, but we need to be
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// careful that users of the pooled connection get a sensible
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// error if they continue to use it (i.e. not an NPE or ISE).
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if (StaticUtils.DEBUG_LOG.isLoggable(Level.FINE))
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{
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StaticUtils.DEBUG_LOG
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.finest(String
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.format(
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"Connection error occured: "
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+ error.getMessage()
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+ " numConnections: %d, poolSize: %d, pendingFutures: %d",
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numConnections, pool.size(), pendingFutures
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.size()));
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}
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}
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}
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}
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// Future used for waiting for pooled connections to become available.
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private static final class FuturePooledConnection extends
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AbstractFutureResult<AsynchronousConnection>
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{
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private FuturePooledConnection(
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ResultHandler<? super AsynchronousConnection> handler)
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{
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super(handler);
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}
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/**
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* {@inheritDoc}
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*/
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public int getRequestID()
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{
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return -1;
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}
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}
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/**
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* Creates a new connection pool which will maintain {@code poolSize}
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* connections created using the provided connection factory.
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*
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* @param connectionFactory
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* The connection factory to use for creating new
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* connections.
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* @param poolSize
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* The maximum size of the connection pool.
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*/
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ConnectionPool(ConnectionFactory<?> connectionFactory, int poolSize)
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{
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this.connectionFactory = connectionFactory;
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this.poolSize = poolSize;
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this.pool = new Stack<AsynchronousConnection>();
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this.pendingFutures = new ConcurrentLinkedQueue<FuturePooledConnection>();
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}
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public FutureResult<AsynchronousConnection> getAsynchronousConnection(
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ResultHandler<? super AsynchronousConnection> handler)
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{
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synchronized (lock)
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{
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// Check to see if we have a connection in the pool
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if (!pool.isEmpty())
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{
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AsynchronousConnection conn = pool.pop();
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if (StaticUtils.DEBUG_LOG.isLoggable(Level.FINE))
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{
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StaticUtils.DEBUG_LOG
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.finest(String
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.format(
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"Connection aquired from pool. "
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+ "numConnections: %d, poolSize: %d, pendingFutures: %d",
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numConnections, pool.size(), pendingFutures
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.size()));
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}
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PooledConnectionWapper pooledConnection = new PooledConnectionWapper(
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conn);
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if (handler != null)
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{
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handler.handleResult(pooledConnection);
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}
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return new CompletedFutureResult<AsynchronousConnection>(
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pooledConnection);
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}
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// Pool was empty. Maybe a new connection if pool size is not
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// reached
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if (numConnections < poolSize)
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{
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// We can create a new connection.
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numConnections++;
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FutureNewConnection future = new FutureNewConnection(handler);
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future.setFutureResult(connectionFactory
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.getAsynchronousConnection(future));
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if (StaticUtils.DEBUG_LOG.isLoggable(Level.FINE))
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{
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StaticUtils.DEBUG_LOG
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.finest(String
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.format(
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"New connection established and aquired. "
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+ "numConnections: %d, poolSize: %d, pendingFutures: %d",
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numConnections, pool.size(), pendingFutures
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.size()));
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}
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return future;
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}
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else
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{
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// Pool is full so wait for a connection to become available.
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FuturePooledConnection future = new FuturePooledConnection(
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handler);
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pendingFutures.add(future);
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if (StaticUtils.DEBUG_LOG.isLoggable(Level.FINE))
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{
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StaticUtils.DEBUG_LOG
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.finest(String
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.format(
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"No connections available. Wait-listed"
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+ "numConnections: %d, poolSize: %d, pendingFutures: %d",
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numConnections, pool.size(), pendingFutures
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.size()));
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}
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return future;
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}
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}
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}
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}
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