/*
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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 legal-notices/CDDLv1_0.txt
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* or http://forgerock.org/license/CDDLv1.0.html.
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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 legal-notices/CDDLv1_0.txt.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* 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 2006-2009 Sun Microsystems, Inc.
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* Portions Copyright 2013-2015 ForgeRock AS.
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*/
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package org.opends.server.replication.protocol;
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import java.util.zip.DataFormatException;
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import org.opends.server.replication.common.AssuredMode;
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import org.opends.server.replication.common.CSN;
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import static org.opends.server.replication.protocol.ByteArrayBuilder.*;
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/**
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* Abstract class that must be extended to define a message
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* used for sending Updates between servers.
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*/
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public class UpdateMsg extends ReplicationMsg
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implements Comparable<UpdateMsg>
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{
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/** Protocol version. */
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protected short protocolVersion;
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/** The CSN of this update. */
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protected CSN csn;
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/** True when the update must use assured replication. */
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protected boolean assuredFlag;
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/** When assuredFlag is true, defines the requested assured mode. */
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protected AssuredMode assuredMode = AssuredMode.SAFE_DATA_MODE;
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/** When assured mode is safe data, gives the requested level. */
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protected byte safeDataLevel = 1;
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/** The payload that must be encoded in this message. */
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private final byte[] payload;
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/**
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* Creates a new empty UpdateMsg.
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*/
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protected UpdateMsg()
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{
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payload = null;
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}
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/**
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* Creates a new UpdateMsg with the given information.
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*
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* @param bytes A Byte Array with the encoded form of the message.
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*
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* @throws DataFormatException If bytes is not valid.
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*/
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UpdateMsg(byte[] bytes) throws DataFormatException
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{
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final ByteArrayScanner scanner = new ByteArrayScanner(bytes);
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decodeHeader(MSG_TYPE_GENERIC_UPDATE, scanner);
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// Read the payload : all the remaining bytes but the terminating 0
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payload = scanner.remainingBytes();
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}
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/**
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* Creates a new UpdateMsg with the given informations.
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* <p>
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* This constructor is only used for testing.
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*
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* @param csn The CSN associated with the change encoded in this message.
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* @param payload The payload that must be encoded in this message.
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*/
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public UpdateMsg(CSN csn, byte[] payload)
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{
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this.payload = payload;
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this.protocolVersion = ProtocolVersion.getCurrentVersion();
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this.csn = csn;
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}
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/**
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* Get the CSN from the message.
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* @return the CSN
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*/
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public CSN getCSN()
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{
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return csn;
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}
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/**
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* Get a boolean indicating if the Update must be processed as an
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* Asynchronous or as an assured replication.
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*
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* @return Returns the assuredFlag.
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*/
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public boolean isAssured()
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{
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return assuredFlag;
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}
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/**
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* Set the Update message as an assured message.
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*
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* @param assured If the message is assured or not. Using true implies
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* setAssuredMode method must be called.
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*/
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public void setAssured(boolean assured)
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{
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assuredFlag = assured;
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}
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/** {@inheritDoc} */
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@Override
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public boolean equals(Object obj)
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{
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return obj != null
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&& obj.getClass() == getClass()
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&& csn.equals(((UpdateMsg) obj).csn);
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}
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/** {@inheritDoc} */
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@Override
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public int hashCode()
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{
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return csn.hashCode();
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}
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/** {@inheritDoc} */
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@Override
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public int compareTo(UpdateMsg msg)
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{
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return csn.compareTo(msg.getCSN());
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}
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/**
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* Get the assured mode in this message.
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* @return The assured mode in this message
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*/
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public AssuredMode getAssuredMode()
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{
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return assuredMode;
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}
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/**
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* Get the safe data level in this message.
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* @return The safe data level in this message
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*/
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public byte getSafeDataLevel()
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{
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return safeDataLevel;
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}
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/**
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* Set the assured mode. Assured boolean must be set to true for this field
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* to mean something.
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* @param assuredMode The chosen assured mode.
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*/
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public void setAssuredMode(AssuredMode assuredMode)
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{
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this.assuredMode = assuredMode;
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}
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/**
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* Set the safe data level. Assured mode should be set to safe data for this
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* field to mean something.
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* @param safeDataLevel The chosen safe data level.
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*/
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public void setSafeDataLevel(byte safeDataLevel)
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{
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this.safeDataLevel = safeDataLevel;
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}
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/**
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* Get the version included in the update message. Means the replication
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* protocol version with which this update message was instantiated.
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*
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* @return The version with which this update message was instantiated.
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*/
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public short getVersion()
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{
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return protocolVersion;
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}
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/**
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* Return the number of bytes used by this message.
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*
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* @return The number of bytes used by this message.
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*/
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public int size()
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{
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return 10 + payload.length;
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}
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/**
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* Encode the common header for all the UpdateMsg. This uses the current
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* protocol version.
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*
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* @param msgType The type of UpdateMsg to encode.
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* @param protocolVersion The ProtocolVersion to use when encoding.
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* @return a byte array builder containing the common header
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*/
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protected ByteArrayBuilder encodeHeader(byte msgType, short protocolVersion)
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{
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final ByteArrayBuilder builder =
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new ByteArrayBuilder(bytes(6) + csnsUTF8(1));
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builder.appendByte(msgType);
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builder.appendByte((byte) ProtocolVersion.getCurrentVersion());
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builder.appendCSNUTF8(getCSN());
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builder.appendBoolean(assuredFlag);
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builder.appendByte(assuredMode.getValue());
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builder.appendByte(safeDataLevel);
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return builder;
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}
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/**
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* Decode the Header part of this Update message, and check its type.
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*
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* @param allowedType The allowed type of this Update Message.
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* @param scanner The encoded form of the UpdateMsg.
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* @throws DataFormatException
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* if the scanner does not contain a valid common header.
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*/
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protected void decodeHeader(byte allowedType, ByteArrayScanner scanner)
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throws DataFormatException
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{
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/* The message header is stored in the form :
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* <operation type><protocol version><CSN><assured>
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* <assured mode> <safe data level>
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*/
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final byte msgType = scanner.nextByte();
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if (allowedType != msgType)
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{
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throw new DataFormatException("byte[] is not a valid update msg: "
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+ msgType);
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}
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protocolVersion = scanner.nextByte();
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csn = scanner.nextCSNUTF8();
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assuredFlag = scanner.nextBoolean();
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assuredMode = AssuredMode.valueOf(scanner.nextByte());
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safeDataLevel = scanner.nextByte();
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}
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/**
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* Returns the encoded representation of this update message using the current
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* protocol version.
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*
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* @return The encoded representation of this update message.
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*/
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public byte[] getBytes()
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{
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return getBytes(ProtocolVersion.getCurrentVersion());
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}
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/**
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* This implementation is only called during unit testing, so we are free to
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* force the protocol version. Underlying implementations override this method
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* in order to provide version specific encodings.
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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(short protocolVersion)
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{
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final ByteArrayBuilder builder = encodeHeader(MSG_TYPE_GENERIC_UPDATE,
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ProtocolVersion.getCurrentVersion());
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builder.appendByteArray(payload);
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return builder.toByteArray();
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}
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/**
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* Get the payload of the UpdateMsg.
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*
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* @return The payload of the UpdateMsg.
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*/
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public byte[] getPayload()
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{
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return payload;
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}
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/**
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* Whether the current message can update the "ds-sync-state" attribute.
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*
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* @return true if current message can update the "ds-sync-state" attribute, false otherwise.
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*/
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public boolean contributesToDomainState()
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{
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return true;
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}
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}
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