/*
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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 com.sun.opends.sdk.util.Validator;
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import com.sun.opends.sdk.util.StaticUtils;
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import java.util.List;
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import java.util.ArrayList;
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import java.util.logging.Level;
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/**
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* Created by IntelliJ IDEA. User: digitalperk Date: Dec 15, 2009 Time:
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* 3:49:17 PM To change this template use File | Settings | File
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* Templates.
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*/
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public abstract class AbstractLoadBalancingAlgorithm implements
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LoadBalancingAlgorithm
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{
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protected final List<MonitoredConnectionFactory> factoryList;
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protected AbstractLoadBalancingAlgorithm(
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ConnectionFactory<?>... factories)
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{
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Validator.ensureNotNull((Object[]) factories);
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factoryList = new ArrayList<MonitoredConnectionFactory>(
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factories.length);
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for (ConnectionFactory<?> f : factories)
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{
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factoryList.add(new MonitoredConnectionFactory(f));
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}
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new MonitorThread().start();
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}
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protected class MonitoredConnectionFactory extends
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AbstractConnectionFactory<AsynchronousConnection> implements
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ResultHandler<AsynchronousConnection>
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{
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private final ConnectionFactory<?> factory;
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private volatile boolean isOperational;
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private volatile FutureResult<?> pendingConnectFuture;
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private MonitoredConnectionFactory(ConnectionFactory<?> factory)
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{
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this.factory = factory;
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this.isOperational = true;
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}
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public boolean isOperational()
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{
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return isOperational;
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}
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public void handleErrorResult(ErrorResultException error)
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{
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isOperational = false;
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}
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public void handleResult(AsynchronousConnection result)
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{
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isOperational = true;
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// TODO: Notify the server is back up
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result.close();
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}
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public FutureResult<? extends AsynchronousConnection> getAsynchronousConnection(
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final ResultHandler<? super AsynchronousConnection> resultHandler)
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{
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ResultHandler<AsynchronousConnection> handler = new ResultHandler<AsynchronousConnection>()
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{
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public void handleErrorResult(ErrorResultException error)
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{
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isOperational = false;
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if (resultHandler != null)
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{
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resultHandler.handleErrorResult(error);
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}
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if (StaticUtils.DEBUG_LOG.isLoggable(Level.WARNING))
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{
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StaticUtils.DEBUG_LOG.warning(String
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.format("Connection factory " + factory
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+ " is no longer operational: "
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+ error.getMessage()));
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}
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}
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public void handleResult(AsynchronousConnection result)
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{
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isOperational = true;
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if (resultHandler != null)
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{
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resultHandler.handleResult(result);
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}
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if (StaticUtils.DEBUG_LOG.isLoggable(Level.WARNING))
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{
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StaticUtils.DEBUG_LOG.warning(String
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.format("Connection factory " + factory
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+ " is now operational"));
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}
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}
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};
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return factory.getAsynchronousConnection(handler);
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}
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}
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private class MonitorThread extends Thread
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{
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private MonitorThread()
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{
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super("Connection Factory Health Monitor");
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this.setDaemon(true);
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}
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public void run()
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{
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while (true)
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{
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for (MonitoredConnectionFactory f : factoryList)
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{
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if (!f.isOperational
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&& (f.pendingConnectFuture == null || f.pendingConnectFuture
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.isDone()))
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{
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if (StaticUtils.DEBUG_LOG.isLoggable(Level.FINEST))
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{
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StaticUtils.DEBUG_LOG.finest(String
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.format("Attempting connect on factory " + f));
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}
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f.pendingConnectFuture = f.factory
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.getAsynchronousConnection(f);
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}
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}
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try
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{
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sleep(10000);
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}
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catch (InterruptedException e)
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{
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// Ignore and just go around again...
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}
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}
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}
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}
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}
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