/*
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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 2006-2007 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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* Abstract class that must be used when defining messages that can
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* be sent for replication purpose between servers.
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*
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* When extending this class one should also create a new MSG_TYPE
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* and should update the generateMsg() method.
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*/
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public abstract class ReplicationMessage
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{
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static final byte MSG_TYPE_MODIFY_REQUEST = 1;
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static final byte MSG_TYPE_ADD_REQUEST = 2;
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static final byte MSG_TYPE_DELETE_REQUEST = 3;
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static final byte MSG_TYPE_MODIFYDN_REQUEST = 4;
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static final byte MSG_TYPE_ACK = 5;
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static final byte MSG_TYPE_SERVER_START = 6;
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static final byte MSG_TYPE_CHANGELOG_START = 7;
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static final byte MSG_TYPE_WINDOW = 8;
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static final byte MSG_TYPE_HEARTBEAT = 9;
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static final byte MSG_TYPE_INITIALIZE_REQUEST = 10;
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static final byte MSG_TYPE_INITIALIZE_TARGET = 11;
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static final byte MSG_TYPE_ENTRY = 12;
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static final byte MSG_TYPE_DONE = 13;
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static final byte MSG_TYPE_ERROR = 14;
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// Adding a new type of message here probably requires to
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// change accordingly generateMsg method below
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/**
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* Return the byte[] representation of this message.
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* Depending on the message type, the first byte of the byte[] must be.
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* MSG_TYPE_MODIFY_REQUEST
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* MSG_TYPE_ADD_REQUEST
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* MSG_TYPE_DELETE_REQUEST
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* MSG_TYPE_MODIFY_DN_REQUEST
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* MSG_TYPE_ACK
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* MSG_TYPE_SERVER_START
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* MSG_TYPE_CHANGELOG_START
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* MSG_TYPE_WINDOW
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* MSG_TYPE_HEARTBEAT
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* MSG_TYPE_INITIALIZE
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* MSG_TYPE_INITIALIZE_TARGET
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* MSG_TYPE_ENTRY
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* MSG_TYPE_DONE
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* MSG_TYPE_ERROR
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*
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* @return the byte[] representation of this message.
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*/
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public abstract byte[] getBytes();
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/**
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* Generates a ReplicationMessage from its encoded form.
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*
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* @param buffer The encode form of the ReplicationMessage.
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* @return the generated SycnhronizationMessage.
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* @throws DataFormatException if the encoded form was not a valid msg.
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* @throws UnsupportedEncodingException if UTF8 is not supported.
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*/
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public static ReplicationMessage generateMsg(byte[] buffer)
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throws DataFormatException, UnsupportedEncodingException
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{
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ReplicationMessage msg = null;
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switch (buffer[0])
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{
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case MSG_TYPE_MODIFY_REQUEST:
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msg = new ModifyMsg(buffer);
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break;
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case MSG_TYPE_ADD_REQUEST:
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msg = new AddMsg(buffer);
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break;
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case MSG_TYPE_DELETE_REQUEST:
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msg = new DeleteMsg(buffer);
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break;
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case MSG_TYPE_MODIFYDN_REQUEST:
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msg = new ModifyDNMsg(buffer);
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break;
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case MSG_TYPE_ACK:
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msg = new AckMessage(buffer);
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break;
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case MSG_TYPE_SERVER_START:
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msg = new ServerStartMessage(buffer);
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break;
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case MSG_TYPE_CHANGELOG_START:
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msg = new ChangelogStartMessage(buffer);
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break;
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case MSG_TYPE_WINDOW:
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msg = new WindowMessage(buffer);
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break;
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case MSG_TYPE_HEARTBEAT:
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msg = new HeartbeatMessage(buffer);
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break;
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case MSG_TYPE_INITIALIZE_REQUEST:
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msg = new InitializeRequestMessage(buffer);
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break;
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case MSG_TYPE_INITIALIZE_TARGET:
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msg = new InitializeTargetMessage(buffer);
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break;
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case MSG_TYPE_ENTRY:
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msg = new EntryMessage(buffer);
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break;
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case MSG_TYPE_DONE:
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msg = new DoneMessage(buffer);
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break;
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case MSG_TYPE_ERROR:
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msg = new ErrorMessage(buffer);
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break;
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default:
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throw new DataFormatException("received message with unknown type");
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}
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return msg;
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}
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/**
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* Concatenate the tail byte array into the resultByteArray.
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* The resultByteArray must be large enough before calling this method.
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*
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* @param tail the byte array to concatenate.
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* @param resultByteArray The byte array to concatenate to.
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* @param pos the position where to concatenate.
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* @return the next position to use in the resultByteArray.
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*/
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protected int addByteArray(byte[] tail, byte[] resultByteArray, int pos)
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{
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for (int i=0; i<tail.length; i++,pos++)
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{
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resultByteArray[pos] = tail[i];
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}
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resultByteArray[pos++] = 0;
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return pos;
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}
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/**
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* Get the length of the next String encoded in the in byte array.
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*
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* @param in the byte array where to calculate the string.
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* @param pos the position whre to start from in the byte array.
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* @return the length of the next string.
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* @throws DataFormatException If the byte array does not end with null.
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*/
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protected int getNextLength(byte[] in, int pos) throws DataFormatException
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{
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int offset = pos;
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int length = 0;
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while (in[offset++] != 0)
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{
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if (offset >= in.length)
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throw new DataFormatException("byte[] is not a valid modify msg");
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length++;
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}
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return length;
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}
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}
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