001 /* 002 * CDDL HEADER START 003 * 004 * The contents of this file are subject to the terms of the 005 * Common Development and Distribution License, Version 1.0 only 006 * (the "License"). You may not use this file except in compliance 007 * with the License. 008 * 009 * You can obtain a copy of the license at 010 * trunk/opends/resource/legal-notices/OpenDS.LICENSE 011 * or https://OpenDS.dev.java.net/OpenDS.LICENSE. 012 * See the License for the specific language governing permissions 013 * and limitations under the License. 014 * 015 * When distributing Covered Code, include this CDDL HEADER in each 016 * file and include the License file at 017 * trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable, 018 * add the following below this CDDL HEADER, with the fields enclosed 019 * by brackets "[]" replaced with your own identifying information: 020 * Portions Copyright [yyyy] [name of copyright owner] 021 * 022 * CDDL HEADER END 023 * 024 * 025 * Copyright 2007-2008 Sun Microsystems, Inc. 026 */ 027 028 package org.opends.server.replication.protocol; 029 030 import java.io.ByteArrayOutputStream; 031 import java.io.IOException; 032 import java.io.UnsupportedEncodingException; 033 import java.util.ArrayList; 034 import java.util.List; 035 import java.util.zip.DataFormatException; 036 037 /** 038 * 039 * This class defines a message that is sent by a replication server 040 * to the other replication servers in the topology containing the list 041 * of LDAP servers directly connected to it. 042 * A replication server sends a ReplServerInfoMessage when an LDAP 043 * server connects or disconnects. 044 * 045 * Exchanging these messages allows to have each replication server 046 * knowing the complete list of LDAP servers in the topology and 047 * their associated replication server and thus take the appropriate 048 * decision to route a message to an LDAP server. 049 * 050 */ 051 public class ReplServerInfoMessage extends ReplicationMessage 052 { 053 private List<String> connectedServers = null; 054 private long generationId; 055 056 /** 057 * Creates a new changelogInfo message from its encoded form. 058 * 059 * @param in The byte array containing the encoded form of the message. 060 * @throws java.util.zip.DataFormatException If the byte array does not 061 * contain a valid encoded form of the message. 062 */ 063 public ReplServerInfoMessage(byte[] in) throws DataFormatException 064 { 065 try 066 { 067 /* first byte is the type */ 068 if (in.length < 1 || in[0] != MSG_TYPE_REPL_SERVER_INFO) 069 throw new DataFormatException( 070 "Input is not a valid " + this.getClass().getCanonicalName()); 071 072 int pos = 1; 073 074 /* read the generationId */ 075 int length = getNextLength(in, pos); 076 generationId = Long.valueOf(new String(in, pos, length, 077 "UTF-8")); 078 pos += length +1; 079 080 /* read the connected servers */ 081 connectedServers = new ArrayList<String>(); 082 while (pos < in.length) 083 { 084 /* 085 * Read the next server ID 086 * first calculate the length then construct the string 087 */ 088 length = getNextLength(in, pos); 089 connectedServers.add(new String(in, pos, length, "UTF-8")); 090 pos += length +1; 091 } 092 } catch (UnsupportedEncodingException e) 093 { 094 throw new DataFormatException("UTF-8 is not supported by this jvm."); 095 } 096 } 097 098 099 /** 100 * Creates a new ReplServerInfo message from a list of the currently 101 * connected servers. 102 * 103 * @param connectedServers The list of currently connected servers ID. 104 * @param generationId The generationId currently associated with this 105 * domain. 106 */ 107 public ReplServerInfoMessage(List<String> connectedServers, 108 long generationId) 109 { 110 this.connectedServers = connectedServers; 111 this.generationId = generationId; 112 } 113 114 /** 115 * {@inheritDoc} 116 */ 117 @Override 118 public byte[] getBytes() 119 { 120 try 121 { 122 ByteArrayOutputStream oStream = new ByteArrayOutputStream(); 123 124 /* Put the message type */ 125 oStream.write(MSG_TYPE_REPL_SERVER_INFO); 126 127 // Put the generationId 128 oStream.write(String.valueOf(generationId).getBytes("UTF-8")); 129 oStream.write(0); 130 131 // Put the servers 132 if (connectedServers.size() >= 1) 133 { 134 for (String server : connectedServers) 135 { 136 byte[] byteServerURL = server.getBytes("UTF-8"); 137 oStream.write(byteServerURL); 138 oStream.write(0); 139 } 140 } 141 142 return oStream.toByteArray(); 143 } 144 catch (IOException e) 145 { 146 // never happens 147 return null; 148 } 149 } 150 151 /** 152 * Get the list of servers currently connected to the Changelog server 153 * that generated this message. 154 * 155 * @return A collection of the servers currently connected to the Changelog 156 * server that generated this message. 157 */ 158 public List<String> getConnectedServers() 159 { 160 return connectedServers; 161 } 162 163 /** 164 * Get the generationId from this message. 165 * @return The generationId. 166 */ 167 public long getGenerationId() 168 { 169 return generationId; 170 } 171 172 /** 173 * {@inheritDoc} 174 */ 175 @Override 176 public String toString() 177 { 178 String csrvs = ""; 179 for (String s : connectedServers) 180 { 181 csrvs += s + "/"; 182 } 183 return ("ReplServerInfoMessage: genId=" + getGenerationId() + 184 " Connected peers:" + csrvs); 185 } 186 187 }