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berkley
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/**
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* '$RCSfile$'
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2298
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tao
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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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669
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jones
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* with a certain docid.
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berkley
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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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jones
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* Authors: Chad Berkley
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berkley
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*
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jones
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* '$Author$'
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* '$Date$'
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* '$Revision$'
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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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581
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berkley
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*/
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tao
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berkley
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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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sgarg
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import org.apache.log4j.Logger;
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daigle
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import edu.ucsb.nceas.metacat.service.PropertyService;
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import edu.ucsb.nceas.metacat.util.MetaCatUtil;
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669
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jones
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/**
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2298
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tao
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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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669
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jones
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* with a certain docid.
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*/
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berkley
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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 String docid;
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private String action;
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private boolean xmlDocument;
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berkley
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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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tao
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// When a metacat A got forcereplication
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tao
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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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sgarg
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private Logger logMetacat = Logger.getLogger(ForceReplicationHandler.class);
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//constant
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public static final String DELETE = "delete";
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berkley
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/**
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* Constructor of ForceReplicationHandler
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berkley
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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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berkley
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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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berkley
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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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logMetacat.error("Error in ForceReplicationHandle(): "
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+e.getMessage());
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}//catch
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// Get the notification server
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this.notificationServer = myNotificationServer;
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tao
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berkley
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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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tao
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581
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berkley
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/**
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* Use this constructor when the action is implied.
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*/
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2298
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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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berkley
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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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sgarg
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logMetacat.error("Error in ForceReplicationHandle(): "
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+e.getMessage());
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tao
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}//catch
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// Get notification server
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this.notificationServer = myNotificationServer;
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berkley
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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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tao
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1292
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tao
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/**
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2298
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tao
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* Method to send force replication command to other server to get
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1292
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tao
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* a new or updated docid
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*/
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berkley
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public void run()
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{
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2649
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tao
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4080
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daigle
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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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return;
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}
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2298
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tao
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4080
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daigle
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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;
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try {
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sleepTime = Integer.parseInt(PropertyService
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4178
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daigle
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.getProperty("replication.forcereplicationwaitingtime"));
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4080
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daigle
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Thread.sleep(sleepTime);
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} catch (Exception ee) {
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logMetacat.error("Couldn't sleep in force replication");
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}
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logMetacat.info("notification server:" + notificationServer);
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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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//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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try {
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2298
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tao
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179 |
4080
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daigle
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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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2298
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tao
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183 |
4080
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daigle
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if (dbactionFlag) {
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// xml documents and server can replicate xml doucment
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if (xmlDocument && replicationServer.getReplication()) {
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// If this docid's homeserver is localhost, replicate it
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if (homeServerCode == 1) {
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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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+ MetaCatUtil.getLocalReplicationServerName()
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+ "&docid=" + docid + "&dbaction=" + 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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comeAndGetIt = new URL("https://" + server
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+ "?action="
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198 |
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+ MetacatReplication.FORCEREPLICATEDELETE
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199 |
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+ "&docid=" + docid + "&server="
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200 |
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+ MetaCatUtil.getLocalReplicationServerName());
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201 |
2298
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tao
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202 |
4080
|
daigle
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}
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203 |
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}//if servercode==1
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204 |
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else if (replicationServer.getHub()
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|| server.equals(MetacatReplication
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206 |
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.getServerNameForServerCode(homeServerCode))) {
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207 |
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// If the docid's home server is not local host, but local host
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208 |
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// is a hub of this server, replicate the docid too.
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209 |
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// If the server is homeserver of the docid, replication it too
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210 |
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MetacatReplication.replLog("force xml replicating to "
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211 |
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+ server);
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212 |
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comeAndGetIt = new URL("https://" + server
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213 |
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+ "?action=forcereplicate&server="
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214 |
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+ MetaCatUtil.getLocalReplicationServerName()
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215 |
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+ "&docid=" + docid + "&dbaction=" + action);
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216 |
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//over write the url for delete
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217 |
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if (action != null && action.equals(DELETE)) {
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218 |
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comeAndGetIt = new URL("https://" + server
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219 |
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+ "?action="
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220 |
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+ MetacatReplication.FORCEREPLICATEDELETE
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221 |
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+ "&docid=" + docid + "&server="
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222 |
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+ MetaCatUtil.getLocalReplicationServerName());
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223 |
2298
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tao
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224 |
4080
|
daigle
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}
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225 |
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}//else
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226 |
2298
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tao
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227 |
4080
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daigle
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}//if xmlDocument
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228 |
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//It is data file and configured to handle data replication
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229 |
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else if (replicationServer.getDataReplication()) {
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230 |
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// If the docid's home server is local host, replicate the docid
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231 |
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if (homeServerCode == 1) {
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232 |
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MetacatReplication.replLog("force data replicating to "
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233 |
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+ server);
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234 |
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comeAndGetIt = new URL("https://" + server
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235 |
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+ "?action=forcereplicatedatafile&server="
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236 |
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+ MetaCatUtil.getLocalReplicationServerName()
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237 |
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+ "&docid=" + docid + "&dbaction=" + action);
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238 |
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//over write the url for delete
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239 |
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if (action != null && action.equals(DELETE)) {
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240 |
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comeAndGetIt = new URL("https://" + server
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241 |
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+ "?action="
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242 |
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+ MetacatReplication.FORCEREPLICATEDELETE
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243 |
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+ "&docid=" + docid + "&server="
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244 |
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+ MetaCatUtil.getLocalReplicationServerName());
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245 |
2298
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tao
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246 |
4080
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daigle
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}
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247 |
2298
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tao
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248 |
4080
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daigle
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}//if serverCode==1
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249 |
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else if (replicationServer.getHub()
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250 |
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|| server.equals(MetacatReplication
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251 |
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.getServerNameForServerCode(homeServerCode))) {
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252 |
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// If the docid's home server is not local host, but local host
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253 |
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// is a hub of this server, replicate the docid too.
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254 |
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// If the server is homeserver of the docid replication it too
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255 |
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MetacatReplication.replLog("force data replicating to "
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256 |
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+ server);
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257 |
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comeAndGetIt = new URL("https://" + server
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258 |
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+ "?action=forcereplicatedatafile&server="
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259 |
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+ MetaCatUtil.getLocalReplicationServerName()
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260 |
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+ "&docid=" + docid + "&dbaction=" + action);
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261 |
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//over write the url for delete
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262 |
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if (action != null && action.equals(DELETE)) {
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263 |
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comeAndGetIt = new URL("https://" + server
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264 |
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+ "?action="
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265 |
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+ MetacatReplication.FORCEREPLICATEDELETE
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266 |
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+ "&docid=" + docid + "&server="
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267 |
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+ MetaCatUtil.getLocalReplicationServerName());
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268 |
2298
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tao
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269 |
4080
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daigle
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}
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270 |
2298
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tao
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271 |
4080
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daigle
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}//else if servercode==1
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272 |
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}//else if data file
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273 |
2298
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tao
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274 |
4080
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daigle
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}//if has explicite action
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275 |
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else { // has implicite action
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276 |
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MetacatReplication
|
277 |
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.replLog("force replicating (default action) to )"
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278 |
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+ server);
|
279 |
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// this docid is xml documents and can replicate xml doucment
|
280 |
|
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if (xmlDocument && replicationServer.getReplication()) {
|
281 |
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// If homeserver of this doicd is local, replicate it
|
282 |
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if (homeServerCode == 1) {
|
283 |
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comeAndGetIt = new URL("https://" + server
|
284 |
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+ "?action=forcereplicate&server="
|
285 |
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+ MetaCatUtil.getLocalReplicationServerName()
|
286 |
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+ "&docid=" + docid);
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287 |
2298
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tao
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288 |
4080
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daigle
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}//if homeserver ==1
|
289 |
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else if (replicationServer.getHub()
|
290 |
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|| server.equals(MetacatReplication
|
291 |
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.getServerNameForServerCode(homeServerCode))) {
|
292 |
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// If home server of this docid is not local host, but local
|
293 |
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// host is a hub for this server, replicate this doicd
|
294 |
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// If the server is homeserver of the docid, replication it too
|
295 |
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comeAndGetIt = new URL("https://" + server
|
296 |
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+ "?action=forcereplicate&server="
|
297 |
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+ MetaCatUtil.getLocalReplicationServerName()
|
298 |
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+ "&docid=" + docid);
|
299 |
2298
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tao
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300 |
4080
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daigle
|
}//else if
|
301 |
2298
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tao
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302 |
4080
|
daigle
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}//if xmlDoucment
|
303 |
|
|
else if (replicationServer.getDataReplication()) { //It is datafile and server is configured to replicate data file
|
304 |
2298
|
tao
|
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305 |
4080
|
daigle
|
//if home server is local host, replicate the data file
|
306 |
|
|
if (homeServerCode == 1) {
|
307 |
|
|
comeAndGetIt = new URL("https://" + server
|
308 |
|
|
+ "?action=forcereplicatedatafile&server="
|
309 |
|
|
+ MetaCatUtil.getLocalReplicationServerName()
|
310 |
|
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+ "&docid=" + docid);
|
311 |
|
|
}//if
|
312 |
|
|
else if (replicationServer.getHub()
|
313 |
|
|
|| server.equals(MetacatReplication
|
314 |
|
|
.getServerNameForServerCode(homeServerCode))) {
|
315 |
|
|
// If home server is not local host, but the local host is a hub
|
316 |
|
|
// For this server, replicate the data file
|
317 |
|
|
// If the server is homeserver of the docid, replication it too
|
318 |
|
|
comeAndGetIt = new URL("https://" + server
|
319 |
|
|
+ "?action=forcereplicatedatafile&server="
|
320 |
|
|
+ MetaCatUtil.getLocalReplicationServerName()
|
321 |
|
|
+ "&docid=" + docid);
|
322 |
2298
|
tao
|
|
323 |
4080
|
daigle
|
}//else
|
324 |
|
|
}//else if
|
325 |
|
|
}//else has implicit action
|
326 |
2298
|
tao
|
|
327 |
4080
|
daigle
|
//Make sure comeAndGetIt is not empty
|
328 |
|
|
if (comeAndGetIt != null && !comeAndGetIt.equals("")) {
|
329 |
|
|
logMetacat.warn("sending message: " + comeAndGetIt.toString());
|
330 |
|
|
String message = MetacatReplication.getURLContent(comeAndGetIt);
|
331 |
|
|
}
|
332 |
|
|
//send out the url. message is a dummy variable as the target of
|
333 |
|
|
//the URL never directly replies to the request. this simply
|
334 |
|
|
//invoces a read request from the server to this local machine.
|
335 |
|
|
}//if notification server
|
336 |
|
|
} catch (Exception ee) {
|
337 |
|
|
logMetacat.error("error in ForceReplicationHandler.run for server "
|
338 |
|
|
+ server + " " + ee.getMessage());
|
339 |
|
|
ee.printStackTrace();
|
340 |
|
|
}
|
341 |
|
|
}//for
|
342 |
2298
|
tao
|
|
343 |
4080
|
daigle
|
logMetacat.warn("exiting ForceReplicationHandler Thread");
|
344 |
|
|
}//run
|
345 |
1292
|
tao
|
}//ForceReplication class
|