/*
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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 2007-2008 Sun Microsystems, Inc.
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*/
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package org.opends.server.replication.protocol;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.UnsupportedEncodingException;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.zip.DataFormatException;
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/**
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*
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* This class defines a message that is sent by a replication server
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* to the other replication servers in the topology containing the list
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* of LDAP servers directly connected to it.
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* A replication server sends a ReplServerInfoMessage when an LDAP
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* server connects or disconnects.
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*
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* Exchanging these messages allows to have each replication server
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* knowing the complete list of LDAP servers in the topology and
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* their associated replication server and thus take the appropriate
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* decision to route a message to an LDAP server.
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*
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*/
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public class ReplServerInfoMessage extends ReplicationMessage
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{
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private List<String> connectedServers = null;
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private long generationId;
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/**
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* Creates a new changelogInfo message from its encoded form.
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*
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* @param in The byte array containing the encoded form of the message.
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* @throws java.util.zip.DataFormatException If the byte array does not
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* contain a valid encoded form of the message.
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*/
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public ReplServerInfoMessage(byte[] in) throws DataFormatException
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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.length < 1 || in[0] != MSG_TYPE_REPL_SERVER_INFO)
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throw new DataFormatException(
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"Input is not a valid " + this.getClass().getCanonicalName());
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int pos = 1;
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/* read the generationId */
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int length = getNextLength(in, pos);
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generationId = Long.valueOf(new String(in, pos, length,
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"UTF-8"));
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pos += length +1;
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/* read the connected servers */
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connectedServers = new ArrayList<String>();
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while (pos < in.length)
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{
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/*
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* Read the next server ID
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* first calculate the length then construct the string
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*/
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length = getNextLength(in, pos);
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connectedServers.add(new String(in, pos, length, "UTF-8"));
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pos += length +1;
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}
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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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* Creates a new ReplServerInfo message from a list of the currently
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* connected servers.
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*
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* @param connectedServers The list of currently connected servers ID.
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* @param generationId The generationId currently associated with this
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* domain.
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*/
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public ReplServerInfoMessage(List<String> connectedServers,
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long generationId)
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{
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this.connectedServers = connectedServers;
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this.generationId = generationId;
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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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try
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{
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ByteArrayOutputStream oStream = new ByteArrayOutputStream();
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/* Put the message type */
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oStream.write(MSG_TYPE_REPL_SERVER_INFO);
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// Put the generationId
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oStream.write(String.valueOf(generationId).getBytes("UTF-8"));
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oStream.write(0);
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// Put the servers
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if (connectedServers.size() >= 1)
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{
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for (String server : connectedServers)
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{
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byte[] byteServerURL = server.getBytes("UTF-8");
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oStream.write(byteServerURL);
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oStream.write(0);
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}
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}
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return oStream.toByteArray();
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}
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catch (IOException e)
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{
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// never happens
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return null;
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}
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}
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/**
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* Get the list of servers currently connected to the Changelog server
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* that generated this message.
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*
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* @return A collection of the servers currently connected to the Changelog
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* server that generated this message.
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*/
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public List<String> getConnectedServers()
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{
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return connectedServers;
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}
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/**
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* Get the generationId from this message.
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* @return The generationId.
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*/
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public long getGenerationId()
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{
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return generationId;
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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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String csrvs = "";
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for (String s : connectedServers)
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{
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csrvs += s + "/";
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}
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return ("ReplServerInfoMessage: genId=" + getGenerationId() +
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" Connected peers:" + csrvs);
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}
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}
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