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: 3:49:17
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* PM To change this template use File | Settings | File Templates.
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*/
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public abstract class AbstractLoadBalancingAlgorithm
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implements LoadBalancingAlgorithm
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{
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protected final List<MonitoredConnectionFactory> factoryList;
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protected AbstractLoadBalancingAlgorithm(ConnectionFactory<?>... factories)
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{
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Validator.ensureNotNull(factories);
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factoryList = new ArrayList<MonitoredConnectionFactory>(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
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extends AbstractConnectionFactory<AsynchronousConnection>
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implements 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>
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getAsynchronousConnection(
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final ResultHandler<? super AsynchronousConnection> resultHandler)
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{
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ResultHandler 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
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.warning(String
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.format(
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"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
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.warning(String
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.format(
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"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 && (f.pendingConnectFuture == null ||
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f.pendingConnectFuture.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
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.finest(String.format("Attempting connect on factory " + f));
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}
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f.pendingConnectFuture = f.factory.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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