/*
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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.server;
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import static org.opends.server.loggers.ErrorLogger.logError;
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import static org.opends.server.messages.MessageHandler.getMessage;
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import static org.opends.server.messages.ReplicationMessages.*;
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import static org.opends.server.util.StaticUtils.getFileForPath;
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import java.io.File;
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import java.io.IOException;
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import java.net.InetAddress;
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import java.net.InetSocketAddress;
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import java.net.ServerSocket;
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import java.net.Socket;
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import java.net.UnknownHostException;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Set;
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import org.opends.server.admin.server.ConfigurationChangeListener;
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import org.opends.server.admin.std.server.ReplicationServerCfg;
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import org.opends.server.api.ConfigurableComponent;
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import org.opends.server.api.DirectoryThread;
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import org.opends.server.config.ConfigAttribute;
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import org.opends.server.config.ConfigEntry;
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import org.opends.server.config.ConfigException;
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import org.opends.server.replication.protocol.SocketSession;
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import org.opends.server.types.ConfigChangeResult;
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import org.opends.server.types.DN;
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import org.opends.server.types.ErrorLogCategory;
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import org.opends.server.types.ErrorLogSeverity;
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import org.opends.server.types.ResultCode;
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import com.sleepycat.je.DatabaseException;
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/**
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* ReplicationServer Listener.
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*
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* This singleton is the main object of the replication server
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* It waits for the incoming connections and create listener
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* and publisher objects for
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* connection with LDAP servers and with replication servers
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*
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* It is responsible for creating the replication server cache and managing it
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*/
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public class ReplicationServer
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implements Runnable, ConfigurableComponent,
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ConfigurationChangeListener<ReplicationServerCfg>
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{
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private short serverId;
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private String serverURL;
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private ServerSocket listenSocket;
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private Thread myListenThread;
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private Thread myConnectThread;
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private boolean runListen = true;
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/* The list of replication servers configured by the administrator */
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private Collection<String> replicationServers;
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/* This table is used to store the list of dn for which we are currently
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* handling servers.
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*/
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private HashMap<DN, ReplicationCache> baseDNs =
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new HashMap<DN, ReplicationCache>();
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private String localURL = "null";
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private boolean shutdown = false;
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private short replicationServerId;
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private DN configDn;
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private List<ConfigAttribute> configAttributes =
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new ArrayList<ConfigAttribute>();
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private ReplicationDbEnv dbEnv;
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private int rcvWindow;
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private int queueSize;
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private String dbDirname = null;
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private long trimAge; // the time (in sec) after which the changes must
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// de deleted from the persistent storage.
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/**
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* Creates a new Replication server using the provided configuration entry.
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*
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* @param configuration The configuration of this replication server.
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* @throws ConfigException When Configuration is invalid.
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*/
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public ReplicationServer(ReplicationServerCfg configuration)
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throws ConfigException
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{
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shutdown = false;
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runListen = true;
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int replicationPort = configuration.getReplicationPort();
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replicationServerId = (short) configuration.getReplicationServerId();
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replicationServers = configuration.getReplicationServer();
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if (replicationServers == null)
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replicationServers = new ArrayList<String>();
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queueSize = configuration.getQueueSize();
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trimAge = configuration.getReplicationPurgeDelay();
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dbDirname = configuration.getReplicationDbDirectory();
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rcvWindow = configuration.getWindowSize();
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if (dbDirname == null)
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{
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dbDirname = "changelogDb";
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}
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// Chech that this path exists or create it.
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File f = getFileForPath(dbDirname);
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try
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{
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if (!f.exists())
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{
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f.mkdir();
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}
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}
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catch (Exception e)
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{
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throw new ConfigException(MSGID_FILE_CHECK_CREATE_FAILED,
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e.getMessage() + " " + getFileForPath(dbDirname));
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}
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initialize(replicationServerId, replicationPort);
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configuration.addChangeListener(this);
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}
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/**
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* {@inheritDoc}
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*/
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public DN getConfigurableComponentEntryDN()
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{
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return configDn;
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}
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/**
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* {@inheritDoc}
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*/
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public List<ConfigAttribute> getConfigurationAttributes()
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{
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return configAttributes ;
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}
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/**
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* {@inheritDoc}
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*/
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public boolean hasAcceptableConfiguration(ConfigEntry configEntry,
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List<String> unacceptableReasons)
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{
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// TODO NYI
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return true;
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}
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/**
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* {@inheritDoc}
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*/
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public ConfigChangeResult applyNewConfiguration(ConfigEntry configEntry,
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boolean detailedResults)
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{
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// TODO NYI
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return null;
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}
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/**
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* spawn the listen thread and the connect thread.
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* Used a a workaround because there can be only one run method
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*/
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public void run()
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{
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if (runListen)
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{
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runListen = false;
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runListen();
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}
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else
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runConnect();
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}
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/**
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* The run method for the Listen thread.
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* This thread accept incoming connections on the replication server
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* ports from other replication servers or from LDAP servers
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* and spawn further thread responsible for handling those connections
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*/
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private void runListen()
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{
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Socket newSocket = null;
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while (shutdown == false)
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{
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// Wait on the replicationServer port.
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// Read incoming messages and create LDAP or ReplicationServer listener
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// and Publisher.
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try
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{
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newSocket = listenSocket.accept();
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newSocket.setReceiveBufferSize(1000000);
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newSocket.setTcpNoDelay(true);
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ServerHandler handler = new ServerHandler(
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new SocketSession(newSocket), queueSize);
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handler.start(null, serverId, serverURL, rcvWindow, this);
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} catch (IOException e)
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{
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// ignore
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// TODO add some logging to allow problem debugging
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}
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}
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}
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/**
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* This method manages the connection with the other replication servers.
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* It periodically checks that this replication server is indeed connected
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* to all the other replication servers and if not attempts to
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* make the connection.
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*/
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private void runConnect()
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{
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while (shutdown == false)
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{
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/*
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* periodically check that we are connected to all other
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* replication servers and if not establish the connection
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*/
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for (ReplicationCache replicationCache: baseDNs.values())
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{
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Set<String> connectedReplServers = replicationCache.getChangelogs();
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/*
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* check that all replication server in the config are in the connected
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* Set. If not create the connection
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*/
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for (String serverURL : replicationServers)
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{
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if ((serverURL.compareTo(this.serverURL) != 0) &&
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(!connectedReplServers.contains(serverURL)))
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{
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this.connect(serverURL, replicationCache.getBaseDn());
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}
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}
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}
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try
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{
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synchronized (this)
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{
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/* check if we are connected every second */
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wait(1000);
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}
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} catch (InterruptedException e)
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{
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// ignore error, will try to connect again or shutdown
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}
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}
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}
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/**
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* Establish a connection to the server with the address and port.
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*
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* @param serverURL The address and port for the server, separated by a
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* colon.
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* @param baseDn The baseDn of the connection
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*/
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private void connect(String serverURL, DN baseDn)
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{
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String token[] = serverURL.split(":");
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String hostname = token[0];
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String port = token[1];
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try
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{
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InetSocketAddress ServerAddr = new InetSocketAddress(
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InetAddress.getByName(hostname), Integer.parseInt(port));
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Socket socket = new Socket();
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socket.setReceiveBufferSize(1000000);
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socket.setTcpNoDelay(true);
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socket.connect(ServerAddr, 500);
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ServerHandler handler = new ServerHandler(
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new SocketSession(socket), queueSize);
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handler.start(baseDn, serverId, this.serverURL, rcvWindow, this);
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}
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catch (IOException e)
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{
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// ignore
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}
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}
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/**
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* initialization function for the replicationServer.
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*
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* @param changelogId The unique identifier for this replicationServer.
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* @param changelogPort The port on which the replicationServer should
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* listen.
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*
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*/
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private void initialize(short changelogId, int changelogPort)
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{
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try
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{
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/*
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* Initialize the replicationServer database.
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*/
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dbEnv = new ReplicationDbEnv(getFileForPath(dbDirname).getAbsolutePath(),
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this);
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/*
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* create replicationServer cache
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*/
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serverId = changelogId;
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/*
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* Open replicationServer socket
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*/
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String localhostname = InetAddress.getLocalHost().getHostName();
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String localAdddress = InetAddress.getLocalHost().getHostAddress();
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serverURL = localhostname + ":" + String.valueOf(changelogPort);
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localURL = localAdddress + ":" + String.valueOf(changelogPort);
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listenSocket = new ServerSocket();
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listenSocket.setReceiveBufferSize(1000000);
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listenSocket.bind(new InetSocketAddress(changelogPort));
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/*
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* create working threads
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*/
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myListenThread = new DirectoryThread(this, "Replication Server Listener");
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myListenThread.start();
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myConnectThread = new DirectoryThread(this, "Replication Server Connect");
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myConnectThread.start();
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} catch (DatabaseException e)
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{
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int msgID = MSGID_COULD_NOT_INITIALIZE_DB;
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String message = getMessage(msgID, dbDirname);
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logError(ErrorLogCategory.SYNCHRONIZATION, ErrorLogSeverity.SEVERE_ERROR,
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message, msgID);
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} catch (ReplicationDBException e)
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{
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int msgID = MSGID_COULD_NOT_READ_DB;
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String message = getMessage(msgID, dbDirname);
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message += getMessage(e.getMessageID());
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logError(ErrorLogCategory.SYNCHRONIZATION, ErrorLogSeverity.SEVERE_ERROR,
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message, msgID);
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} catch (UnknownHostException e)
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{
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int msgID = MSGID_UNKNOWN_HOSTNAME;
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String message = getMessage(msgID);
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logError(ErrorLogCategory.SYNCHRONIZATION, ErrorLogSeverity.SEVERE_ERROR,
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message, msgID);
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} catch (IOException e)
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{
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int msgID = MSGID_COULD_NOT_BIND_CHANGELOG;
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String message = getMessage(msgID, changelogPort, e.getMessage());
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logError(ErrorLogCategory.SYNCHRONIZATION, ErrorLogSeverity.SEVERE_ERROR,
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message, msgID);
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}
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}
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/**
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* Get the ReplicationCache associated to the base DN given in parameter.
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*
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* @param baseDn The base Dn for which the ReplicationCache must be returned.
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* @return The ReplicationCache associated to the base DN given in parameter.
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*/
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public ReplicationCache getReplicationCache(DN baseDn)
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{
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ReplicationCache replicationCache;
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synchronized (baseDNs)
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{
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replicationCache = baseDNs.get(baseDn);
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if (replicationCache == null)
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replicationCache = new ReplicationCache(baseDn, this);
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baseDNs.put(baseDn, replicationCache);
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}
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return replicationCache;
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}
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/**
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* Shutdown the Replication Server service and all its connections.
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*/
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public void shutdown()
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{
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shutdown = true;
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// shutdown the connect thread
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try
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{
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myConnectThread.interrupt();
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} catch (NullPointerException e)
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{
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// FIXME To be investigated the conditions
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// where myConnectThread can be null here
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}
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// shutdown the listener thread
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try
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{
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listenSocket.close();
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} catch (IOException e)
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{
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// replication Server service is closing anyway.
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}
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// shutdown all the ChangelogCaches
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for (ReplicationCache replicationCache : baseDNs.values())
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{
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replicationCache.shutdown();
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}
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dbEnv.shutdown();
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}
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/**
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* Creates a new DB handler for this ReplicationServer and the serverId and
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* DN given in parameter.
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*
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* @param id The serverId for which the dbHandler must be created.
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* @param baseDn The DN for which the dbHandler muste be created.
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* @return The new DB handler for this ReplicationServer and the serverId and
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* DN given in parameter.
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* @throws DatabaseException in case of underlying database problem.
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*/
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public DbHandler newDbHandler(short id, DN baseDn) throws DatabaseException
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{
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return new DbHandler(id, baseDn, this, dbEnv);
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}
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/**
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* Retrieves the time after which changes must be deleted from the
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* persistent storage (in milliseconds).
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*
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* @return The time after which changes must be deleted from the
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* persistent storage (in milliseconds).
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*/
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public long getTrimage()
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{
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return trimAge * 1000;
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}
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/**
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* Check if the provided configuration is acceptable for add.
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*
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* @param configuration The configuration to check.
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* @param unacceptableReasons When the configuration is not acceptable, this
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* table is use to return the reasons why this
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* configuration is not acceptbale.
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*
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* @return true if the configuration is acceptable, false other wise.
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*/
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public static boolean isConfigurationAcceptable(
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ReplicationServerCfg configuration, List<String> unacceptableReasons)
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{
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int port = configuration.getReplicationPort();
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try
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{
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ServerSocket tmpSocket = new ServerSocket();
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tmpSocket.bind(new InetSocketAddress(port));
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tmpSocket.close();
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}
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catch (Exception e)
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{
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String message = getMessage(MSGID_COULD_NOT_BIND_CHANGELOG, port,
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e.getMessage());
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unacceptableReasons.add(message);
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return false;
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}
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return true;
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}
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/**
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* {@inheritDoc}
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*/
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public ConfigChangeResult applyConfigurationChange(
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ReplicationServerCfg configuration)
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{
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// TODO : implement this
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return new ConfigChangeResult(ResultCode.SUCCESS, false);
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}
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/**
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* {@inheritDoc}
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*/
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public boolean isConfigurationChangeAcceptable(
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ReplicationServerCfg configuration, List<String> unacceptableReasons)
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{
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// TODO : implement this
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return true;
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}
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}
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