/*
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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 2006-2008 Sun Microsystems, Inc.
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*/
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package org.opends.server.replication.protocol;
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import java.io.UnsupportedEncodingException;
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import java.util.zip.DataFormatException;
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/**
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* This message is used by LDAP server or by Replication Servers to
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* update the send window of the remote entities.
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*
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* A receiving entity should create such a message with a given credit
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* when it wants to open the send window of the remote entity.
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* A LDAP or Replication Server should increase its send window when receiving
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* such a message.
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*/
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public class WindowMsg extends ReplicationMsg
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{
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private final int numAck;
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/**
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* Create a new WindowMsg.
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*
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* @param numAck The number of acknowledged messages.
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* The window will be increase by this credit number.
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*/
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public WindowMsg(int numAck)
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{
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this.numAck = numAck;
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}
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/**
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* Creates a new WindowMsg from its encoded form.
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*
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* @param in The byte array containing the encoded form of the
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* WindowMsg.
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* @throws DataFormatException If the byte array does not contain a valid
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* encoded form of the WindowMsg.
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*/
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public WindowMsg(byte[] in) throws DataFormatException
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{
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/* The WindowMsg is encoded in the form :
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* <numAck>
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*/
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try
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{
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/* first byte is the type */
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if (in[0] != MSG_TYPE_WINDOW)
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throw new DataFormatException("input is not a valid Window Message");
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int pos = 1;
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/*
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* read the number of acks contained in this message.
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* first calculate the length then construct the string
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*/
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int length = getNextLength(in, pos);
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String numAckStr = new String(in, pos, length, "UTF-8");
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pos += length +1;
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numAck = Integer.parseInt(numAckStr);
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} catch (UnsupportedEncodingException e)
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{
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throw new DataFormatException("UTF-8 is not supported by this jvm.");
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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 byte[] getBytes()
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{
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/*
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* WindowMsg contains.
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* <numAck>
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*/
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try {
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byte[] byteNumAck = String.valueOf(numAck).getBytes("UTF-8");
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int length = 1 + byteNumAck.length + 1;
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byte[] resultByteArray = new byte[length];
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/* put the type of the operation */
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resultByteArray[0] = MSG_TYPE_WINDOW;
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int pos = 1;
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pos = addByteArray(byteNumAck, resultByteArray, pos);
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return resultByteArray;
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}
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catch (UnsupportedEncodingException e)
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{
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return null;
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}
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}
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/**
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* Get the number of message acknowledged by the Window Message.
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*
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* @return the number of message acknowledged by the Window Message.
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*/
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public int getNumAck()
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{
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return numAck;
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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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return "WindowMsg : " + "numAck: " + numAck;
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}
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}
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