/*
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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.InputStream;
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import java.io.OutputStream;
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import java.net.Socket;
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import java.util.zip.DataFormatException;
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import org.opends.server.synchronization.SynchronizationMessage;
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/**
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* This class Implement a protocol session using a basic socket and relying on
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* the innate encoding/decoding capabilities of the SynchronizationMessage
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* by using the getBytes() and generateMsg() methods of those classes.
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*
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* TODO : should have some versioning in the packets so that
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* the futur versions can evolve while still
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* being able to understand the older versions.
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*/
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public class SocketSession implements ProtocolSession
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{
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private Socket socket;
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private InputStream input;
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private OutputStream output;
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byte[] rcvLengthBuf = new byte[8];
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/**
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* Creates a new SocketSession based on the provided socket.
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*
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* @param socket The Socket on which the SocketSession will be based.
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* @throws IOException When an IException happens on the socket.
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*/
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public SocketSession(Socket socket) throws IOException
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{
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this.socket = socket;
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input = socket.getInputStream();
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output = 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
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{
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byte[] buffer = msg.getBytes();
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String str = String.format("%08x", buffer.length);
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byte[] sendLengthBuf = str.getBytes();
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output.write(sendLengthBuf);
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output.write(buffer);
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output.flush();
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}
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/**
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* {@inheritDoc}
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*/
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public SynchronizationMessage receive() throws IOException,
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ClassNotFoundException, DataFormatException
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{
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/* Read the first 8 bytes containing the packet length */
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int length = 0;
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while (length<8)
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{
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int read = input.read(rcvLengthBuf, length, 8-length);
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if (read == -1)
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throw new IOException("no more data");
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else
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length += read;
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}
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int totalLength = Integer.parseInt(new String(rcvLengthBuf), 16);
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try
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{
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length = 0;
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byte[] buffer = new byte[totalLength];
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while (length < totalLength)
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length += input.read(buffer, length, totalLength - length);
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return SynchronizationMessage.generateMsg(buffer);
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}
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catch (OutOfMemoryError e)
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{
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throw new IOException("Packet too large, can't allocate "
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+ totalLength + " bytes.");
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}
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}
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}
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