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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: 2005-09-08 16:03:24 -0700 (Thu, 08 Sep 2005) $'
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* '$Revision: 2579 $'
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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 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 ReplicationServerList serverLists = null;//Serverlist
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private int homeServerCode = 0; // home server code for the docid
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// When a metacat A got forcereplication
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// notification from B, then A will update its record. And A will notification
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// other metacat in its serverlist to update this docid if A is a hub. But we
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// don't want A to notify B again. B is nofitification of A
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private String notificationServer = null;
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//constant
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public static final String DELETE = "delete";
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/**
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* Constructor of ForceReplicationHandler
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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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* @param xml the docid is a xml document or not (data file)
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* @param notificationServer, when a metacat A got forcereplication
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* notification from B, then A will update its record. And A will notification
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* other metacat in its serverlist to update this docid if A is a hub. But we
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* don't want A to notify B again. B is nofitification of A.
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*/
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public ForceReplicationHandler(String docid, String action, boolean xml,
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String myNotificationServer)
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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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// Build a severLists from xml_replication table
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this.serverLists = new ReplicationServerList();
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// Get sever code for this docid
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try
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{
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this.homeServerCode = MetacatReplication.getHomeServerCodeForDocId(docid);
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}//try
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catch (Exception e)
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{
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MetaCatUtil.debugMessage("Error in ForceReplicationHandle(): "
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+e.getMessage(), 30);
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}//catch
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// Get the notification server
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this.notificationServer = myNotificationServer;
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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,
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String myNotificationServer )
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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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// Build a severLists from xml_replication table
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this.serverLists = new ReplicationServerList();
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// Get home server code for this doicd
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try
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{
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this.homeServerCode = MetacatReplication.getHomeServerCodeForDocId(docid);
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}
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catch (Exception e)
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{
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MetaCatUtil.debugMessage("Error in ForceReplicationHandle(): "
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+e.getMessage(), 30);
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}//catch
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// Get notification server
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this.notificationServer = myNotificationServer;
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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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* Method to send force replication command to other server to get
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* a new or updated docid
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*/
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public void run()
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{
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try
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{
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// URL for notifcation
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URL comeAndGetIt = null;
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// If no server in xml_replication table, metacat don't need do anything
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if (serverLists.isEmpty())
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{
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return;
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}
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// Thread seelping for some seconds to make sure the document was insert
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// into the database before we send force replication request
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int sleepTime = Integer.parseInt
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(MetaCatUtil.getOption("forcereplicationwaitingtime"));
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Thread.sleep(sleepTime);
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MetaCatUtil.debugMessage("notification server:"+notificationServer, 34);
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// Check every server in the serverlists
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for (int i=0; i<serverLists.size(); i++)
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{
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//Set comeAndGetIt null
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comeAndGetIt = null;
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// Get ReplicationServer object in index i
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ReplicationServer replicationServer = serverLists.serverAt(i);
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// Get this ReplicationServer 's name
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String server = replicationServer.getServerName();
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// If the server is the notification server, we don't notify it back
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// again, if server is null we don't replication it
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if (server!=null && !server.equals(notificationServer))
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{
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if(dbactionFlag)
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{
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// xml documents and server can replicate xml doucment
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if (xmlDocument && replicationServer.getReplication())
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{
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// If this docid's homeserver is localhost, replicate it
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if (homeServerCode==1)
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{
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MetacatReplication.replLog("force xml replicating to "
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+ server);
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comeAndGetIt = new URL("https://" + server +
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"?action=forcereplicate&server=" +
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util.getLocalReplicationServerName()+
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"&docid=" + docid + "&dbaction=" +
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action);
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//over write the url for delete
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if (action != null && action.equals(DELETE))
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{
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comeAndGetIt = new URL("https://" + server + "?action=" +
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MetacatReplication.FORCEREPLICATEDELETE +
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"&docid=" + docid +"&server="+ util.getLocalReplicationServerName());
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}
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}//if servercode==1
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else if (replicationServer.getHub()||
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server.equals(MetacatReplication.
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getServerNameForServerCode(homeServerCode)))
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{
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// If the docid's home server is not local host, but local host
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// is a hub of this server, replicate the docid too.
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// If the server is homeserver of the docid, replication it too
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MetacatReplication.replLog("force xml replicating to "
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+ server);
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comeAndGetIt = new URL("https://" + server +
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"?action=forcereplicate&server=" +
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util.getLocalReplicationServerName() +
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"&docid=" + docid + "&dbaction=" +
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action);
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//over write the url for delete
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if (action != null && action.equals(DELETE))
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{
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comeAndGetIt = new URL("https://" + server + "?action=" +
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MetacatReplication.FORCEREPLICATEDELETE +
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"&docid=" + docid+"&server="+ util.getLocalReplicationServerName());
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}
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}//else
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}//if xmlDocument
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//It is data file and configured to handle data replication
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else if (replicationServer.getDataReplication())
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{
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// If the docid's home server is local host, replicate the docid
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if (homeServerCode==1)
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{
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MetacatReplication.replLog("force data replicating to "
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+ server);
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comeAndGetIt = new URL("https://" + server +
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"?action=forcereplicatedatafile&server=" +
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util.getLocalReplicationServerName() +
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"&docid=" + docid + "&dbaction=" +
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action);
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//over write the url for delete
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if (action != null && action.equals(DELETE))
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{
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comeAndGetIt = new URL("https://" + server + "?action=" +
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MetacatReplication.FORCEREPLICATEDELETE +
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"&docid=" + docid +"&server="+ util.getLocalReplicationServerName());
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}
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}//if serverCode==1
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else if (replicationServer.getHub()||
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server.equals(MetacatReplication.
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getServerNameForServerCode(homeServerCode)))
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{
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// If the docid's home server is not local host, but local host
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// is a hub of this server, replicate the docid too.
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// If the server is homeserver of the docid replication it too
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MetacatReplication.replLog("force data replicating to "
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+ server);
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comeAndGetIt = new URL("https://" + server +
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"?action=forcereplicatedatafile&server=" +
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util.getLocalReplicationServerName() +
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"&docid=" + docid + "&dbaction=" +
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action);
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//over write the url for delete
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if (action != null && action.equals(DELETE))
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{
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comeAndGetIt = new URL("https://" + server + "?action=" +
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MetacatReplication.FORCEREPLICATEDELETE +
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"&docid=" + docid+"&server="+ util.getLocalReplicationServerName());
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}
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}//else if servercode==1
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}//else if data file
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}//if has explicite action
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else
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{ // has implicite action
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MetacatReplication.replLog("force replicating (default action) to )"
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+ server);
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// this docid is xml documents and can replicate xml doucment
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if (xmlDocument && replicationServer.getReplication())
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{
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// If homeserver of this doicd is local, replicate it
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if (homeServerCode ==1)
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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.getLocalReplicationServerName()+
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"&docid=" + docid);
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}//if homeserver ==1
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else if (replicationServer.getHub()||
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server.equals(MetacatReplication.
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getServerNameForServerCode(homeServerCode)))
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{
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// If home server of this docid is not local host, but local
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// host is a hub for this server, replicate this doicd
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// If the server is homeserver of the docid, replication it too
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comeAndGetIt = new URL("https://" + server +
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"?action=forcereplicate&server=" +
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util.getLocalReplicationServerName() +
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"&docid=" + docid);
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}//else if
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}//if xmlDoucment
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else if (replicationServer.getDataReplication())
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{ //It is datafile and server is configured to replicate data file
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//if home server is local host, replicate the data file
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if (homeServerCode ==1)
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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.getLocalReplicationServerName() +
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"&docid=" + docid);
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}//if
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else if (replicationServer.getHub()||
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server.equals(MetacatReplication.
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getServerNameForServerCode(homeServerCode)))
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{
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// If home server is not local host, but the local host is a hub
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// For this server, replicate the data file
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// If the server is homeserver of the docid, replication it too
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comeAndGetIt = new URL("https://" + server +
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"?action=forcereplicatedatafile&server=" +
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util.getLocalReplicationServerName() +
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"&docid=" + docid);
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}//else
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}//else if
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}//else has implicit action
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//Make sure comeAndGetIt is not empty
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if ( comeAndGetIt != null && !comeAndGetIt.equals(""))
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{
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MetaCatUtil.debugMessage("sending message: "
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+ comeAndGetIt.toString(), 25);
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String message = MetacatReplication.getURLContent(comeAndGetIt);
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}
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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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}//if notification server
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}//for
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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", 25);
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}//run
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}//ForceReplication class
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