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/**
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* '$RCSfile$'
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* Purpose: A class to asyncronously force the replication of each server
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* that has an entry in the xml_replication table. When run,
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* this thread communicates with each server in the list and
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* solicites a read of an updated or newly inserted document
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* with a certain docid.
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* Copyright: 2000 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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* Authors: Chad Berkley
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* Release: @release@
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*
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* '$Author: tao $'
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* '$Date: 2002-04-30 08:21:10 -0700 (Tue, 30 Apr 2002) $'
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* '$Revision: 1040 $'
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package edu.ucsb.nceas.metacat;
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import java.util.*;
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import java.io.*;
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import java.sql.*;
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import java.net.*;
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import java.lang.*;
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import java.text.*;
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/**
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* A class to asyncronously force the replication of each server
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* that has an entry in the xml_replication table. When run,
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* this thread communicates with each server in the list and
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* solicites a read of an updated or newly inserted document
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* with a certain docid.
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*/
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public class ForceReplicationHandler implements Runnable
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{
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private Thread btThread;
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private Connection conn;
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private MetaCatUtil util = new MetaCatUtil();
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private String docid;
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private String action;
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private boolean xmlDocument;
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private boolean dbactionFlag = true;
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private Hashtable serverList;
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/**
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* @param docid the docid to force replicate
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* @param the action that is being performed on the document (either
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* INSERT or UPDATE)
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*/
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public ForceReplicationHandler(String docid, String action, boolean xml,
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Hashtable server )
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{
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this.docid = docid;
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this.action = action;
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this.xmlDocument =xml;
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this.serverList = server;
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if(this.action.equals(""))
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{
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dbactionFlag = false;
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}
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btThread = new Thread(this);
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btThread.setPriority(Thread.MIN_PRIORITY);
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btThread.start();
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}
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/**
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* Use this constructor when the action is implied.
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*/
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public ForceReplicationHandler(String docid, boolean xml, Hashtable server)
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{
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this.docid = docid;
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this.xmlDocument = xml;
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dbactionFlag = false;
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this.serverList = server;
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btThread = new Thread(this);
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btThread.setPriority(Thread.MIN_PRIORITY);
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btThread.start();
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}
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public void run()
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{
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//System.out.println("in ForceReplicationHandler Thread");
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try
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{
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//check if the metacat was configured to hanldle replication
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if (!(util.getOption("replication")).equals("on"))
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{
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return;
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}
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URL comeAndGetIt = null;
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conn = util.getConnection();
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// If no server in xml_replication table, metacat don't need do anything
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if (ReplicationHandler.buildServerList(conn)==null)
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{
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return;
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}
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//Enumeration keys = (ReplicationHandler.buildServerList(conn)).keys();
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//Make sure that server list is not empty
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if (serverList==null || serverList.isEmpty())
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{
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return;
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}
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Enumeration keys = serverList.keys();
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//get the list of servers
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while(keys.hasMoreElements())
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{
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String server = (String)(keys.nextElement());
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if(dbactionFlag)
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{
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if (xmlDocument)// xml documents
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{
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MetacatReplication.replLog("force xml replicating to " + server);
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comeAndGetIt = new URL("https://" + server +
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"?action=forcereplicate&server=" +
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util.getOption("server") +
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util.getOption("replicationpath") +
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"&docid=" + docid + "&dbaction=" +
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action);
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}
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//It is data file and configured to handle data replication
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else if ((util.getOption("replicationdata")).equals("on"))
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{
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MetacatReplication.replLog("force data replicating to " + server);
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comeAndGetIt = new URL("https://" + server +
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"?action=forcereplicatedatafile&server=" +
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util.getOption("server") +
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util.getOption("replicationpath") +
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"&docid=" + docid + "&dbaction=" +
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action);
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}//else if
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}//if
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else
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{
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MetacatReplication.replLog("force replicating (default action) to )" +
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server);
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if (xmlDocument)
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{
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comeAndGetIt = new URL("https://" + server +
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"?action=forcereplicate&server=" +
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util.getOption("server") +
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util.getOption("replicationpath") +
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"&docid=" + docid);
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}
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//It is datafile and metacat is configured to handle data file
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else if ((util.getOption("replicationdata")).equals("on"))
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{
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comeAndGetIt = new URL("https://" + server +
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"?action=forcereplicatedatafile&server=" +
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util.getOption("server") +
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util.getOption("replicationpath") +
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"&docid=" + docid);
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}//else if
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}//else
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MetaCatUtil.debugMessage("sending message: " + comeAndGetIt.toString());
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String message = MetacatReplication.getURLContent(comeAndGetIt);
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//send out the url. message is a dummy variable as the target of
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//the URL never directly replies to the request. this simply
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//invoces a read request from the server to this local machine.
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}//while
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util.returnConnection(conn);
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}//try
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catch(Exception e)
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{
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System.out.println("error in ForceReplicationHandler.run: " +
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e.getMessage());
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e.printStackTrace(System.out);
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}
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MetaCatUtil.debugMessage("exiting ForceReplicationHandler Thread");
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}
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}
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