/*
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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 2006-2010 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 ReplicationMsg
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{
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// PDU type values kept for compatibility with replication protocol version 1
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static final byte MSG_TYPE_MODIFY_V1 = 1;
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static final byte MSG_TYPE_ADD_V1 = 2;
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static final byte MSG_TYPE_DELETE_V1 = 3;
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static final byte MSG_TYPE_MODIFYDN_V1 = 4;
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static final byte MSG_TYPE_SERVER_START_V1 = 6;
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static final byte MSG_TYPE_REPL_SERVER_START_V1 = 7;
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static final byte MSG_TYPE_REPL_SERVER_INFO_V1 = 16;
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// PDU type values for current protocol version (see ProtocolVersion)
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static final byte MSG_TYPE_ACK = 5;
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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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static final byte MSG_TYPE_WINDOW_PROBE = 15;
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static final byte MSG_TYPE_RESET_GENERATION_ID = 17;
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static final byte MSG_TYPE_REPL_SERVER_MONITOR_REQUEST = 18;
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static final byte MSG_TYPE_REPL_SERVER_MONITOR = 19;
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static final byte MSG_TYPE_SERVER_START = 20;
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static final byte MSG_TYPE_REPL_SERVER_START = 21;
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static final byte MSG_TYPE_MODIFY = 22;
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static final byte MSG_TYPE_ADD = 23;
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static final byte MSG_TYPE_DELETE = 24;
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static final byte MSG_TYPE_MODIFYDN = 25;
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static final byte MSG_TYPE_TOPOLOGY = 26;
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static final byte MSG_TYPE_START_SESSION = 27;
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static final byte MSG_TYPE_CHANGE_STATUS = 28;
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static final byte MSG_TYPE_GENERIC_UPDATE = 29;
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// Added for protocol version 3
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static final byte MSG_TYPE_START_ECL = 30;
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static final byte MSG_TYPE_START_ECL_SESSION = 31;
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static final byte MSG_TYPE_ECL_UPDATE = 32;
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static final byte MSG_TYPE_CT_HEARTBEAT = 33;
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// Added for protocol version 4
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// - New msgs types
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static final byte MSG_TYPE_REPL_SERVER_START_DS = 34;
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static final byte MSG_TYPE_STOP = 35;
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static final byte MSG_TYPE_INITIALIZE_RCV_ACK = 36;
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// - Modified msgs types
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// EntryMsg, InitializeRequestMsg, InitializeTargetMsg, ErrorMsg
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// TopologyMsg
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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 one of
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* the MSG_TYPE* definitions. The serialization is done using the current
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* protocol version. For a serialization using a particular protocol version,
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* call the getBytes(byte protocolVersion) method that should be available
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* for the subclasses (PDUs) that allow such a translation.
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*
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* @return the byte[] representation of this message.
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* @throws UnsupportedEncodingException When the encoding of the message
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* failed because the UTF-8 encoding is not supported.
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*/
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public abstract byte[] getBytes() throws UnsupportedEncodingException;
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/**
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* Serializes the PDU using the provided replication protocol version.
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* WARNING: should be overwritten by a PDU (sub class) we want to support
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* older protocol version serialization for.
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* @param reqProtocolVersion The protocol version to use for serialization.
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* The version should normally be older than the current one.
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* @return The encoded PDU.
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* @throws UnsupportedEncodingException When the encoding of the message
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* failed because the UTF-8 encoding is not supported or the
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* requested protocol version to use is not supported by this PDU.
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*/
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public byte[] getBytes(short reqProtocolVersion)
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throws UnsupportedEncodingException
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{
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// Of course, always support current protocol version
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if (reqProtocolVersion == ProtocolVersion.getCurrentVersion())
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{
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return getBytes();
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}
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// Unsupported requested version
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// Any PDU that support older protocol version serialization should
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// overwrite this method for that.
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throw new UnsupportedEncodingException(getClass().getSimpleName() +
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" PDU does not support requested protocol version serialization: " +
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reqProtocolVersion);
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}
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/**
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* Generates a ReplicationMsg from its encoded form. This un-serialization
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* is done taking into account the various supported replication protocol
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* versions.
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*
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* @param buffer The encode form of the ReplicationMsg.
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* @param version The version to use to decode the msg.
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*
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* @return The generated SycnhronizationMessage.
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*
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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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* @throws NotSupportedOldVersionPDUException If the PDU is part of an old
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* protocol version and we do not support it.
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*/
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public static ReplicationMsg generateMsg(
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byte[] buffer,
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short version)
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throws DataFormatException, UnsupportedEncodingException,
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NotSupportedOldVersionPDUException
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{
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ReplicationMsg msg = null;
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switch (buffer[0])
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{
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case MSG_TYPE_SERVER_START_V1:
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throw new NotSupportedOldVersionPDUException("Server Start",
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ProtocolVersion.REPLICATION_PROTOCOL_V1, buffer[0]);
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case MSG_TYPE_REPL_SERVER_INFO_V1:
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throw new NotSupportedOldVersionPDUException("Replication Server Info",
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ProtocolVersion.REPLICATION_PROTOCOL_V1, buffer[0]);
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case MSG_TYPE_MODIFY:
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msg = new ModifyMsg(buffer);
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break;
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case MSG_TYPE_MODIFY_V1:
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msg = ModifyMsg.createV1(buffer);
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break;
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case MSG_TYPE_ADD:
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case MSG_TYPE_ADD_V1:
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msg = new AddMsg(buffer);
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break;
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case MSG_TYPE_DELETE:
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case MSG_TYPE_DELETE_V1:
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msg = new DeleteMsg(buffer);
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break;
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case MSG_TYPE_MODIFYDN:
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case MSG_TYPE_MODIFYDN_V1:
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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 AckMsg(buffer);
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break;
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case MSG_TYPE_SERVER_START:
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msg = new ServerStartMsg(buffer);
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break;
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case MSG_TYPE_REPL_SERVER_START:
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case MSG_TYPE_REPL_SERVER_START_V1:
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msg = new ReplServerStartMsg(buffer);
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break;
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case MSG_TYPE_WINDOW:
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msg = new WindowMsg(buffer);
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break;
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case MSG_TYPE_HEARTBEAT:
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msg = new HeartbeatMsg(buffer);
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break;
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case MSG_TYPE_INITIALIZE_REQUEST:
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msg = new InitializeRequestMsg(buffer, version);
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break;
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case MSG_TYPE_INITIALIZE_TARGET:
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msg = new InitializeTargetMsg(buffer, version);
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break;
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case MSG_TYPE_ENTRY:
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msg = new EntryMsg(buffer, version);
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break;
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case MSG_TYPE_DONE:
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msg = new DoneMsg(buffer);
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break;
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case MSG_TYPE_ERROR:
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msg = new ErrorMsg(buffer, version);
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break;
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case MSG_TYPE_RESET_GENERATION_ID:
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msg = new ResetGenerationIdMsg(buffer);
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break;
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case MSG_TYPE_WINDOW_PROBE:
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msg = new WindowProbeMsg(buffer);
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break;
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case MSG_TYPE_TOPOLOGY:
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msg = new TopologyMsg(buffer, version);
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break;
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case MSG_TYPE_REPL_SERVER_MONITOR_REQUEST:
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msg = new MonitorRequestMsg(buffer);
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break;
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case MSG_TYPE_REPL_SERVER_MONITOR:
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msg = new MonitorMsg(buffer, version);
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break;
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case MSG_TYPE_START_SESSION:
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msg = new StartSessionMsg(buffer, version);
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break;
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case MSG_TYPE_CHANGE_STATUS:
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msg = new ChangeStatusMsg(buffer);
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break;
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case MSG_TYPE_GENERIC_UPDATE:
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msg = new UpdateMsg(buffer);
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break;
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case MSG_TYPE_START_ECL:
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msg = new ServerStartECLMsg(buffer);
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break;
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case MSG_TYPE_START_ECL_SESSION:
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msg = new StartECLSessionMsg(buffer);
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break;
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case MSG_TYPE_ECL_UPDATE:
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msg = new ECLUpdateMsg(buffer);
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break;
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case MSG_TYPE_CT_HEARTBEAT:
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msg = new ChangeTimeHeartbeatMsg(buffer);
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break;
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case MSG_TYPE_REPL_SERVER_START_DS:
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msg = new ReplServerStartDSMsg(buffer);
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break;
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case MSG_TYPE_STOP:
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msg = new StopMsg(buffer);
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break;
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case MSG_TYPE_INITIALIZE_RCV_ACK:
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msg = new InitializeRcvAckMsg(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 static int addByteArray(byte[] tail, byte[] resultByteArray,
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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 where 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 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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