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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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*
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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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*/
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package edu.ucsb.nceas.metacat.replication;
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import java.io.IOException;
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import java.net.*;
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import org.apache.log4j.Logger;
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import edu.ucsb.nceas.metacat.properties.PropertyService;
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import edu.ucsb.nceas.metacat.shared.ServiceException;
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import edu.ucsb.nceas.metacat.util.MetacatUtil;
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import edu.ucsb.nceas.utilities.PropertyNotFoundException;
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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 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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private static Logger logReplication = Logger.getLogger("ReplicationLogging");
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private static 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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/**
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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 = ReplicationService.getHomeServerCodeForDocId(docid);
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}//try
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catch (ServiceException se)
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{
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logMetacat.error("ForceReplicationHandler() - " + ReplicationService.METACAT_REPL_ERROR_MSG);
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logReplication.error("ForceReplicationHandler() - Service issue in constructor: "
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+ se.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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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 = ReplicationService.getHomeServerCodeForDocId(docid);
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}
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catch (ServiceException se)
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{
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logMetacat.error("ForceReplicationHandler() - " + ReplicationService.METACAT_REPL_ERROR_MSG);
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logReplication.error("ForceReplicationHandler()- Service issue in constructor: "
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+ se.getMessage());
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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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// 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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// 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.getProperty("replication.forcereplicationwaitingtime"));
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Thread.sleep(sleepTime);
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} catch (PropertyNotFoundException pnfe) {
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logMetacat.error("ForceReplicationHandler.run - " + ReplicationService.METACAT_REPL_ERROR_MSG);
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logReplication.error("ForceReplicationHandler.run - property error: " + pnfe.getMessage());
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} catch (InterruptedException ie) {
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logMetacat.error("ForceReplicationHandler.run - " + ReplicationService.METACAT_REPL_ERROR_MSG);
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logReplication.error("ForceReplicationHandler.run - Thread sleep error: " + ie.getMessage());
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}
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logReplication.info("ForceReplicationHandler.run - 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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// 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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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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logReplication.info("ForceReplicationHandler.run - 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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| 200 |
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comeAndGetIt = new URL("https://" + server
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+ "?action="
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+ ReplicationService.FORCEREPLICATEDELETE
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+ "&docid=" + docid + "&server="
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+ MetacatUtil.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(ReplicationService
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.getServerNameForServerCode(homeServerCode))) {
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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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logReplication.info("ForceReplicationHandler.run - 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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+ ReplicationService.FORCEREPLICATEDELETE
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+ "&docid=" + docid + "&server="
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+ MetacatUtil.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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// If the docid's home server is local host, replicate the docid
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if (homeServerCode == 1) {
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logReplication.info("ForceReplicationHandler.run - 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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+ 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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+ ReplicationService.FORCEREPLICATEDELETE
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+ "&docid=" + docid + "&server="
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+ MetacatUtil.getLocalReplicationServerName());
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}
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}//if serverCode==1
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| 253 |
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else if (replicationServer.getHub()
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|| server.equals(ReplicationService
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.getServerNameForServerCode(homeServerCode))) {
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| 256 |
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// If the docid's home server is not local host, but local host
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| 257 |
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// is a hub of this server, replicate the docid too.
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| 258 |
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// If the server is homeserver of the docid replication it too
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| 259 |
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logReplication.info("ForceReplicationHandler.run - 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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+ MetacatUtil.getLocalReplicationServerName()
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| 264 |
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+ "&docid=" + docid + "&dbaction=" + action);
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| 265 |
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//over write the url for delete
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| 266 |
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if (action != null && action.equals(DELETE)) {
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| 267 |
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comeAndGetIt = new URL("https://" + server
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| 268 |
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+ "?action="
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| 269 |
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+ ReplicationService.FORCEREPLICATEDELETE
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+ "&docid=" + docid + "&server="
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+ MetacatUtil.getLocalReplicationServerName());
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}
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| 274 |
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}//else if servercode==1
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| 276 |
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}//else if data file
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| 278 |
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}//if has explicite action
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| 279 |
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else { // has implicite action
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| 280 |
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logReplication.info("ForceReplicationHandler.run - force replicating (default action) to )"
|
| 281 |
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+ server);
|
| 282 |
|
|
// this docid is xml documents and can replicate xml doucment
|
| 283 |
|
|
if (xmlDocument && replicationServer.getReplication()) {
|
| 284 |
|
|
// If homeserver of this doicd is local, replicate it
|
| 285 |
|
|
if (homeServerCode == 1) {
|
| 286 |
|
|
comeAndGetIt = new URL("https://" + server
|
| 287 |
|
|
+ "?action=forcereplicate&server="
|
| 288 |
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+ MetacatUtil.getLocalReplicationServerName()
|
| 289 |
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+ "&docid=" + docid);
|
| 290 |
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|
| 291 |
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|
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}//if homeserver ==1
|
| 292 |
|
|
else if (replicationServer.getHub()
|
| 293 |
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|
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|| server.equals(ReplicationService
|
| 294 |
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|
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|
.getServerNameForServerCode(homeServerCode))) {
|
| 295 |
|
|
// If home server of this docid is not local host, but local
|
| 296 |
|
|
// host is a hub for this server, replicate this doicd
|
| 297 |
|
|
// If the server is homeserver of the docid, replication it too
|
| 298 |
|
|
comeAndGetIt = new URL("https://" + server
|
| 299 |
|
|
+ "?action=forcereplicate&server="
|
| 300 |
4698
|
daigle
|
+ MetacatUtil.getLocalReplicationServerName()
|
| 301 |
4080
|
daigle
|
+ "&docid=" + docid);
|
| 302 |
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|
tao
|
|
| 303 |
4080
|
daigle
|
}//else if
|
| 304 |
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|
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|
| 305 |
4080
|
daigle
|
}//if xmlDoucment
|
| 306 |
|
|
else if (replicationServer.getDataReplication()) { //It is datafile and server is configured to replicate data file
|
| 307 |
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|
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|
|
| 308 |
4080
|
daigle
|
//if home server is local host, replicate the data file
|
| 309 |
|
|
if (homeServerCode == 1) {
|
| 310 |
|
|
comeAndGetIt = new URL("https://" + server
|
| 311 |
|
|
+ "?action=forcereplicatedatafile&server="
|
| 312 |
4698
|
daigle
|
+ MetacatUtil.getLocalReplicationServerName()
|
| 313 |
4080
|
daigle
|
+ "&docid=" + docid);
|
| 314 |
|
|
}//if
|
| 315 |
|
|
else if (replicationServer.getHub()
|
| 316 |
5014
|
daigle
|
|| server.equals(ReplicationService
|
| 317 |
4080
|
daigle
|
.getServerNameForServerCode(homeServerCode))) {
|
| 318 |
|
|
// If home server is not local host, but the local host is a hub
|
| 319 |
|
|
// For this server, replicate the data file
|
| 320 |
|
|
// If the server is homeserver of the docid, replication it too
|
| 321 |
|
|
comeAndGetIt = new URL("https://" + server
|
| 322 |
|
|
+ "?action=forcereplicatedatafile&server="
|
| 323 |
4698
|
daigle
|
+ MetacatUtil.getLocalReplicationServerName()
|
| 324 |
4080
|
daigle
|
+ "&docid=" + docid);
|
| 325 |
2298
|
tao
|
|
| 326 |
4080
|
daigle
|
}//else
|
| 327 |
|
|
}//else if
|
| 328 |
|
|
}//else has implicit action
|
| 329 |
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|
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|
|
| 330 |
4080
|
daigle
|
//Make sure comeAndGetIt is not empty
|
| 331 |
|
|
if (comeAndGetIt != null && !comeAndGetIt.equals("")) {
|
| 332 |
5014
|
daigle
|
logReplication.warn("ForceReplicationHandler.run - sending message: " + comeAndGetIt.toString());
|
| 333 |
|
|
String message = ReplicationService.getURLContent(comeAndGetIt);
|
| 334 |
4080
|
daigle
|
}
|
| 335 |
|
|
//send out the url. message is a dummy variable as the target of
|
| 336 |
|
|
//the URL never directly replies to the request. this simply
|
| 337 |
|
|
//invoces a read request from the server to this local machine.
|
| 338 |
|
|
}//if notification server
|
| 339 |
5014
|
daigle
|
} catch (MalformedURLException mue) {
|
| 340 |
|
|
logMetacat.error("ForceReplicationHandler.run - " + ReplicationService.METACAT_REPL_ERROR_MSG);
|
| 341 |
|
|
logReplication.error("ForceReplicationHandler.run - URL error in ForceReplicationHandler.run for server "
|
| 342 |
|
|
+ server + " : " + mue.getMessage());
|
| 343 |
|
|
// mue.printStackTrace();
|
| 344 |
|
|
} catch (IOException io) {
|
| 345 |
|
|
logMetacat.error("ForceReplicationHandler.run - " + ReplicationService.METACAT_REPL_ERROR_MSG);
|
| 346 |
|
|
logReplication.error("ForceReplicationHandler.run - I/O error in ForceReplicationHandler.run for server "
|
| 347 |
|
|
+ server + " : " + io.getMessage());
|
| 348 |
4080
|
daigle
|
}
|
| 349 |
|
|
}//for
|
| 350 |
2298
|
tao
|
|
| 351 |
5014
|
daigle
|
logReplication.warn("ForceReplicationHandler.run - exiting ForceReplicationHandler Thread");
|
| 352 |
4080
|
daigle
|
}//run
|
| 353 |
1292
|
tao
|
}//ForceReplication class
|