/*
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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 2009-2010 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.LinkedList;
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import java.util.List;
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import java.util.concurrent.CopyOnWriteArrayList;
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import java.util.concurrent.Semaphore;
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import java.util.concurrent.atomic.AtomicBoolean;
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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.AsynchronousFutureResult;
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import com.sun.opends.sdk.util.CompletedFutureResult;
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import com.sun.opends.sdk.util.StaticUtils;
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import com.sun.opends.sdk.util.Validator;
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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 AbstractConnectionFactory
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{
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/**
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* This result handler is invoked when an attempt to add a new connection to
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* the pool completes.
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*/
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private final class ConnectionResultHandler implements
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ResultHandler<AsynchronousConnection>
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{
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/**
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* {@inheritDoc}
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*/
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@Override
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public void handleErrorResult(final ErrorResultException error)
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{
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// Connection attempt failed, so decrease the pool size.
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currentPoolSize.release();
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if (StaticUtils.DEBUG_LOG.isLoggable(Level.FINE))
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{
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StaticUtils.DEBUG_LOG.fine(String.format(
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"Connection attempt failed: " + error.getMessage()
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+ " currentPoolSize=%d, poolSize=%d",
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poolSize - currentPoolSize.availablePermits(), poolSize));
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}
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QueueElement holder;
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synchronized (queue)
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{
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if (queue.isEmpty() || !queue.getFirst().isWaitingFuture())
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{
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// No waiting futures.
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return;
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}
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else
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{
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holder = queue.removeFirst();
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}
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}
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// There was waiting future, so close it.
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holder.getWaitingFuture().handleErrorResult(error);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public void handleResult(final AsynchronousConnection connection)
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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.fine(String.format(
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"Connection attempt succeeded: "
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+ " currentPoolSize=%d, poolSize=%d",
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poolSize - currentPoolSize.availablePermits(), poolSize));
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}
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publishConnection(connection);
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}
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}
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/**
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* A pooled connection is passed to the client. It wraps an underlying
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* "pooled" connection obtained from the underlying factory and lasts until
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* the client application closes this connection. More specifically, pooled
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* connections are not actually stored in the internal queue.
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*/
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private final class PooledConnection implements AsynchronousConnection
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{
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// Connection event listeners registed against this pooled connection should
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// have the same life time as the pooled connection.
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private final List<ConnectionEventListener> listeners =
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new CopyOnWriteArrayList<ConnectionEventListener>();
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private final AsynchronousConnection connection;
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private final AtomicBoolean isClosed = new AtomicBoolean(false);
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PooledConnection(final AsynchronousConnection connection)
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{
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this.connection = connection;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public FutureResult<Void> abandon(final AbandonRequest request)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (isClosed())
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{
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throw new IllegalStateException();
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}
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return connection.abandon(request);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public FutureResult<Result> add(final AddRequest request,
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final ResultHandler<? super Result> handler)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (isClosed())
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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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/**
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* {@inheritDoc}
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*/
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@Override
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public FutureResult<Result> add(final AddRequest request,
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final ResultHandler<? super Result> resultHandler,
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final IntermediateResponseHandler intermediateResponseHandler)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (isClosed())
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{
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throw new IllegalStateException();
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}
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return connection
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.add(request, resultHandler, intermediateResponseHandler);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public void addConnectionEventListener(
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final ConnectionEventListener listener) throws IllegalStateException,
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NullPointerException
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{
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Validator.ensureNotNull(listener);
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if (isClosed())
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{
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throw new IllegalStateException();
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}
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listeners.add(listener);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public FutureResult<BindResult> bind(final BindRequest request,
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final 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 (isClosed())
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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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/**
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* {@inheritDoc}
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*/
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@Override
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public FutureResult<BindResult> bind(final BindRequest request,
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final ResultHandler<? super BindResult> resultHandler,
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final IntermediateResponseHandler intermediateResponseHandler)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (isClosed())
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{
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throw new IllegalStateException();
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}
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return connection.bind(request, resultHandler,
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intermediateResponseHandler);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public void close()
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{
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if (!isClosed.compareAndSet(false, true))
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{
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// Already closed.
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return;
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}
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// Don't put invalid connections back in the pool.
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if (connection.isValid())
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{
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publishConnection(connection);
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}
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else
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{
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// The connection may have been disconnected by the remote server, but
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// the server may still be available. In order to avoid leaving pending
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// futures hanging indefinitely, we should try to reconnect immediately.
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// Close the dead connection.
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connection.close();
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// Try to get a new connection to replace it.
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factory.getAsynchronousConnection(connectionResultHandler);
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if (StaticUtils.DEBUG_LOG.isLoggable(Level.WARNING))
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{
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StaticUtils.DEBUG_LOG.warning(String.format(
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"Connection no longer valid. "
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+ "currentPoolSize=%d, poolSize=%d",
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poolSize - currentPoolSize.availablePermits(), poolSize));
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}
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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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@Override
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public void close(final UnbindRequest request, final 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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/**
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* {@inheritDoc}
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*/
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@Override
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public FutureResult<CompareResult> compare(final CompareRequest request,
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final 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 (isClosed())
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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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/**
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* {@inheritDoc}
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*/
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@Override
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public FutureResult<CompareResult> compare(final CompareRequest request,
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final ResultHandler<? super CompareResult> resultHandler,
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final IntermediateResponseHandler intermediateResponseHandler)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (isClosed())
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{
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throw new IllegalStateException();
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}
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return connection.compare(request, resultHandler,
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intermediateResponseHandler);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public FutureResult<Result> delete(final DeleteRequest request,
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final ResultHandler<? super Result> handler)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (isClosed())
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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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/**
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* {@inheritDoc}
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*/
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@Override
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public FutureResult<Result> delete(final DeleteRequest request,
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final ResultHandler<? super Result> resultHandler,
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final IntermediateResponseHandler intermediateResponseHandler)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (isClosed())
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{
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throw new IllegalStateException();
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}
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return connection.delete(request, resultHandler,
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intermediateResponseHandler);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public <R extends ExtendedResult> FutureResult<R> extendedRequest(
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final ExtendedRequest<R> request, final 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 (isClosed())
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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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/**
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* {@inheritDoc}
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*/
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@Override
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public <R extends ExtendedResult> FutureResult<R> extendedRequest(
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final ExtendedRequest<R> request,
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final ResultHandler<? super R> resultHandler,
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final IntermediateResponseHandler intermediateResponseHandler)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (isClosed())
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{
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throw new IllegalStateException();
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}
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return connection.extendedRequest(request, resultHandler,
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intermediateResponseHandler);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public Connection getSynchronousConnection()
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{
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return new SynchronousConnection(this);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public boolean isClosed()
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{
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return isClosed.get();
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public boolean isValid()
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{
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return connection.isValid() && !isClosed();
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public FutureResult<Result> modify(final ModifyRequest request,
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final ResultHandler<? super Result> handler)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (isClosed())
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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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/**
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* {@inheritDoc}
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*/
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@Override
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public FutureResult<Result> modify(final ModifyRequest request,
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final ResultHandler<? super Result> resultHandler,
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final IntermediateResponseHandler intermediateResponseHandler)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (isClosed())
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{
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throw new IllegalStateException();
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}
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return connection.modify(request, resultHandler,
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intermediateResponseHandler);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public FutureResult<Result> modifyDN(final ModifyDNRequest request,
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final ResultHandler<? super Result> handler)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (isClosed())
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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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/**
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* {@inheritDoc}
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*/
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@Override
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public FutureResult<Result> modifyDN(final ModifyDNRequest request,
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final ResultHandler<? super Result> resultHandler,
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final IntermediateResponseHandler intermediateResponseHandler)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (isClosed())
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{
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throw new IllegalStateException();
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}
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return connection.modifyDN(request, resultHandler,
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intermediateResponseHandler);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public FutureResult<SearchResultEntry> readEntry(final DN name,
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final Collection<String> attributeDescriptions,
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final 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 (isClosed())
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{
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throw new IllegalStateException();
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}
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return connection.readEntry(name, attributeDescriptions, resultHandler);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public FutureResult<RootDSE> readRootDSE(
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final ResultHandler<? super RootDSE> handler)
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throws UnsupportedOperationException, IllegalStateException
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{
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if (isClosed())
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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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@Override
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public FutureResult<Schema> readSchema(final DN name,
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final ResultHandler<? super Schema> handler)
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throws UnsupportedOperationException, IllegalStateException
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{
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if (isClosed())
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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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/**
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* {@inheritDoc}
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*/
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@Override
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public FutureResult<Schema> readSchemaForEntry(final DN name,
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final ResultHandler<? super Schema> handler)
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throws UnsupportedOperationException, IllegalStateException
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{
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if (isClosed())
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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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@Override
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public void removeConnectionEventListener(
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final ConnectionEventListener listener) throws NullPointerException
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{
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Validator.ensureNotNull(listener);
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if (isClosed())
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{
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throw new IllegalStateException();
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}
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listeners.remove(listener);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public FutureResult<Result> search(final SearchRequest request,
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final SearchResultHandler handler)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (isClosed())
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{
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throw new IllegalStateException();
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}
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return connection.search(request, handler);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public FutureResult<Result> search(final SearchRequest request,
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final SearchResultHandler resultHandler,
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final IntermediateResponseHandler intermediateResponseHandler)
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throws UnsupportedOperationException, IllegalStateException,
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NullPointerException
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{
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if (isClosed())
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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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intermediateResponseHandler);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public FutureResult<SearchResultEntry> searchSingleEntry(
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final SearchRequest request,
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final 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 (isClosed())
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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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@Override
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public String toString()
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{
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final StringBuilder builder = new StringBuilder();
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builder.append("PooledConnection(");
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builder.append(connection);
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builder.append(')');
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return builder.toString();
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}
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}
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/**
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* A queue element is either a pending connection request future awaiting an
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* {@code AsynchronousConnection} or it is an unused
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* {@code AsynchronousConnection} awaiting a connection request.
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*/
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private static final class QueueElement
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{
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private final Object value;
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QueueElement(final AsynchronousConnection connection)
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{
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this.value = connection;
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}
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QueueElement(final ResultHandler<? super AsynchronousConnection> handler)
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{
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this.value = new AsynchronousFutureResult<AsynchronousConnection>(handler);
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}
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AsynchronousConnection getWaitingConnection()
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{
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if (value instanceof AsynchronousConnection)
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{
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return (AsynchronousConnection) value;
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}
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else
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{
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throw new IllegalStateException();
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}
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}
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@SuppressWarnings("unchecked")
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AsynchronousFutureResult<AsynchronousConnection> getWaitingFuture()
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{
|
if (value instanceof AsynchronousFutureResult)
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{
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return (AsynchronousFutureResult<AsynchronousConnection>) value;
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}
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else
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{
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throw new IllegalStateException();
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}
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}
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boolean isWaitingFuture()
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{
|
return value instanceof AsynchronousFutureResult;
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}
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public String toString()
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{
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return String.valueOf(value);
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}
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}
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|
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// Guarded by queue.
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private final LinkedList<QueueElement> queue = new LinkedList<QueueElement>();
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private final ConnectionFactory factory;
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private final int poolSize;
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private final Semaphore currentPoolSize;
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private final ResultHandler<AsynchronousConnection> connectionResultHandler =
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new ConnectionResultHandler();
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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 factory
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* The connection factory to use for creating new connections.
|
* @param poolSize
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* The maximum size of the connection pool.
|
*/
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ConnectionPool(final ConnectionFactory factory, final int poolSize)
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{
|
this.factory = factory;
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this.poolSize = poolSize;
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this.currentPoolSize = new Semaphore(poolSize);
|
}
|
|
|
|
/**
|
* {@inheritDoc}
|
*/
|
@Override
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public FutureResult<AsynchronousConnection> getAsynchronousConnection(
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final ResultHandler<? super AsynchronousConnection> handler)
|
{
|
QueueElement holder;
|
synchronized (queue)
|
{
|
if (queue.isEmpty() || queue.getFirst().isWaitingFuture())
|
{
|
holder = new QueueElement(handler);
|
queue.add(holder);
|
}
|
else
|
{
|
holder = queue.removeFirst();
|
}
|
}
|
|
if (!holder.isWaitingFuture())
|
{
|
// There was a completed connection attempt.
|
final AsynchronousConnection connection = holder.getWaitingConnection();
|
final PooledConnection pooledConnection = new PooledConnection(connection);
|
if (handler != null)
|
{
|
handler.handleResult(pooledConnection);
|
}
|
return new CompletedFutureResult<AsynchronousConnection>(pooledConnection);
|
}
|
else
|
{
|
// Grow the pool if needed.
|
final FutureResult<AsynchronousConnection> future = holder
|
.getWaitingFuture();
|
if (!future.isDone() && currentPoolSize.tryAcquire())
|
{
|
factory.getAsynchronousConnection(connectionResultHandler);
|
}
|
return future;
|
}
|
}
|
|
|
|
/**
|
* {@inheritDoc}
|
*/
|
@Override
|
public String toString()
|
{
|
final StringBuilder builder = new StringBuilder();
|
builder.append("ConnectionPool(");
|
builder.append(String.valueOf(factory));
|
builder.append(',');
|
builder.append(poolSize);
|
builder.append(')');
|
return builder.toString();
|
}
|
|
|
|
private void publishConnection(final AsynchronousConnection connection)
|
{
|
QueueElement holder;
|
synchronized (queue)
|
{
|
if (queue.isEmpty() || !queue.getFirst().isWaitingFuture())
|
{
|
holder = new QueueElement(connection);
|
queue.add(holder);
|
return;
|
}
|
else
|
{
|
holder = queue.removeFirst();
|
}
|
}
|
|
// There was waiting future, so close it.
|
final PooledConnection pooledConnection = new PooledConnection(connection);
|
holder.getWaitingFuture().handleResult(pooledConnection);
|
}
|
}
|
