/*
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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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* Portions Copyright 2006 Sun Microsystems, Inc.
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*/
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package org.opends.server.changelog;
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import java.io.IOException;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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import java.net.Socket;
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import java.net.SocketException;
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import org.opends.server.synchronization.SynchronizationMessage;
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/**
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* This class use serialization to implement the ProtocolSession interface.
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* It was done to speed up the development of the sycnhronization feature
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* because it delegate most of its job to the object serialization but
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* will be replaced by a more appropriate mechanism.
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*/
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public class SerializingProtocolSession implements ProtocolSession
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{
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Socket socket;
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ObjectOutputStream socketOutput = null;
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ObjectInputStream socketInput = null;
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private int count = 0;
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/**
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* Creates a new SerializingProtocolSession based on the provided
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* socket.
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* @param socket The socket that will be used to create the
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* SerializingProtocolSession
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* @throws IOException When an IO error happen using the provided socket.
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*/
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public SerializingProtocolSession(Socket socket) throws IOException
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{
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this.socket = socket;
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socketOutput = new ObjectOutputStream(socket.getOutputStream());
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}
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/**
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* {@inheritDoc}
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*/
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public void close() throws IOException
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{
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socket.close();
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}
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/**
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* {@inheritDoc}
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*/
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public synchronized void publish(SynchronizationMessage msg)
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throws IOException, SocketException
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{
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socketOutput.writeObject(msg);
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socketOutput.flush();
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/*
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* ObjectOutputStream class keep a cache of objects that have already
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* been sent across this stream. This improve performances by avoiding
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* sending several times the same object but unfortunately can cause
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* memory growth and in our case severe performance degradations.
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* We therefore free those resources by reseting the cache
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* every so often
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*/
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if (count++ >= 5000)
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{
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socketOutput.reset();
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count = 0;
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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 SynchronizationMessage receive()
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throws IOException, ClassNotFoundException
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{
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if (socketInput == null)
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{
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socketInput = new ObjectInputStream(socket.getInputStream());
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}
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return (SynchronizationMessage) socketInput.readObject();
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}
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}
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