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/**
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* '$RCSfile$'
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* Purpose: A class to asyncronously do delta-T replication checking
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* Copyright: 2000 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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* Authors: Chad Berkley
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* Release: @release@
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*
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* '$Author: tao $'
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* '$Date: 2002-06-13 11:54:51 -0700 (Thu, 13 Jun 2002) $'
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* '$Revision: 1217 $'
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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.sql.*;
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import java.util.*;
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import java.lang.Thread;
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import java.io.*;
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import java.net.*;
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import java.text.*;
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import org.xml.sax.AttributeList;
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import org.xml.sax.ContentHandler;
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import org.xml.sax.DTDHandler;
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import org.xml.sax.EntityResolver;
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import org.xml.sax.ErrorHandler;
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import org.xml.sax.InputSource;
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import org.xml.sax.XMLReader;
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import org.xml.sax.SAXException;
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import org.xml.sax.SAXParseException;
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import org.xml.sax.helpers.XMLReaderFactory;
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import org.xml.sax.helpers.DefaultHandler;
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/**
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* This class handles deltaT replication checking. Whenever this TimerTask
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* is fired it checks each server in xml_replication for updates and updates
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* the local db as needed.
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*/
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public class ReplicationHandler extends TimerTask
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{
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int serverCheckCode = 1;
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MetaCatUtil util = new MetaCatUtil();
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Hashtable serverList = new Hashtable();
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//Connection conn;
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PrintWriter out;
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public ReplicationHandler(PrintWriter o)
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{
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this.out = o;
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}
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public ReplicationHandler(PrintWriter o, int serverCheckCode)
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{
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this.out = o;
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this.serverCheckCode = serverCheckCode;
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}
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/**
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* Method that implements TimerTask.run(). It runs whenever the timer is
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* fired.
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*/
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public void run()
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{
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//find out the last_checked time of each server in the server list and
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//send a query to each server to see if there are any documents in
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//xml_documents with an update_date > last_checked
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try
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{
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//try
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//{ //this connection is prone to error for some reason so we
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//try to connect it three times before quiting.
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//conn = util.openDBConnection();
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//}
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//catch(SQLException sqle)
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//{
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/*try
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{
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conn = util.openDBConnection();
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}
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catch(SQLException sqlee)
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{
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try
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{
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conn = util.openDBConnection();
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}
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catch(SQLException sqleee)
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{*/
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//System.out.println("error getting db connection in " +
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//"ReplicationHandler.run: " +
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//sqle.getMessage());
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//}
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//}
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//}
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serverList = buildServerList();
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//if serverList is null, metacat don't need to replication
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if (serverList==null||serverList.isEmpty())
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{
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return;
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}
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updateCatalog(serverList);
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update(serverList);
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//conn.close();
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}//try
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catch (Exception e)
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{
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MetaCatUtil.debugMessage("Error in replicationHandler.run():"
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+e.getMessage(), 30);
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}//catch
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}
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/**
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* Method that uses revision taging for replication instead of update_date.
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*/
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private void update(Hashtable serverList)
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{
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/*
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Pseudo-algorithm
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- request a doc list from each server in xml_replication
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- check the rev number of each of those documents agains the
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documents in the local database
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- pull any documents that have a lesser rev number on the local server
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from the remote server
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- delete any documents that still exist in the local xml_documents but
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are in the deletedDocuments tag of the remote host response.
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- update last_checked to keep track of the last time it was checked.
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(this info is theoretically not needed using this system but probably
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should be kept anyway)
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*/
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DBConnection dbConn = null;
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int serialNumber = -1;
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/*try
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{
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conn = util.getConnection();
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}
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catch (Exception e)
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{
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util.debugMessage("There is problem to get conncetion: "+e.getMessage());
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}*/
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Enumeration keys;
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String server;
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String update;
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ReplMessageHandler message = new ReplMessageHandler();
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Vector responses = new Vector();
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PreparedStatement pstmt = null;
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ResultSet rs;
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boolean tablehasrows;
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boolean flag=false;
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boolean dataFile=false;
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String action = new String();
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XMLReader parser;
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URL u;
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try
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{
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dbConn=DBConnectionPool.
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getDBConnection("ReplicationHandler.update");
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serialNumber=dbConn.getCheckOutSerialNumber();
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MetaCatUtil.debugMessage("init parser");
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parser = initParser(message);
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keys = serverList.keys();
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while(keys.hasMoreElements())
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{
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server = (String)(keys.nextElement());
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MetacatReplication.replLog("full update started to: " + server);
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u = new URL("https://" + server + "?server="
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+util.getLocalReplicationServerName()+"&action=update");
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//System.out.println("Sending Message: " + u.toString());
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String result = MetacatReplication.getURLContent(u);
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//check if result have error or not
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if (result.indexOf("error")!=-1)
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{
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continue;
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}
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responses.add(result);
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}
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//make sure that there is updated file list
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//If response is null, mecat don't need do anything
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if (responses==null||responses.isEmpty())
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{
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return;
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}
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//String srvr = util.getOption("servletpath");
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//System.out.println("responses (from srvr): " + responses.toString());
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for(int i=0; i<responses.size(); i++)
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{ //check each server for updated files
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//System.out.println("parsing responses");
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parser.parse(new InputSource(
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new StringReader(
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(String)(responses.elementAt(i)))));
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//v is the list of updated documents
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Vector v = new Vector(message.getUpdatesVect());
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//System.out.println("v: " + v.toString());
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//d is the list of deleted documents
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Vector d = new Vector(message.getDeletesVect());
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//System.out.println("d: " + d.toString());
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//check the revs in u to see if there are any newer ones than
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//in the local DB.
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MetaCatUtil.debugMessage("Update vector size: "+ v.size(), 20);
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MetaCatUtil.debugMessage("Delete vector size: "+ d.size(),20);
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for(int j=0; j<v.size(); j++)
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{
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//initial dataFile is false
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dataFile=false;
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//w is information for one document, information contain
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//docid, rev, server or datafile.
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Vector w = new Vector((Vector)(v.elementAt(j)));
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//Check if the vector w contain "datafile"
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//If it has, this document is data file
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if (w.contains((String)util.getOption("datafileflag")))
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{
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dataFile=true;
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}
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//System.out.println("w: " + w.toString());
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String docid = (String)w.elementAt(0);
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MetaCatUtil.debugMessage("docid: " + docid, 40);
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int rev = Integer.parseInt((String)w.elementAt(1));
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MetaCatUtil.debugMessage("rev: " + rev, 40);
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String docServer = (String)w.elementAt(2);
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pstmt = dbConn.prepareStatement("select rev from xml_documents where "+
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"docid like '" + docid + "'");
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pstmt.execute();
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rs = pstmt.getResultSet();
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tablehasrows = rs.next();
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if(tablehasrows)
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{ //check the revs for an update because this document is in the
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//local DB, it just might be out of date.
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int localrev = rs.getInt(1);
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if(localrev == rev)
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{
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flag = false;
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}
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else if(localrev < rev)
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{//this document needs to be updated so send an read request
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action = "UPDATE";
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flag = true;
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}
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}
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else
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{ //insert this document as new because it is not in the local DB
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action = "INSERT";
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flag = true;
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}
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// this is non-data file
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if(flag && !dataFile)
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{ //if the document needs to be updated or inserted, this is executed
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u = new URL("https://" + docServer + "?server="+
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util.getLocalReplicationServerName()+"&action=read&docid="+docid);
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//System.out.println("Sending message: " + u.toString());
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String newxmldoc = MetacatReplication.getURLContent(u);
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if ( newxmldoc.indexOf("error")!= -1)
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{
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continue;
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}
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MetaCatUtil.debugMessage("xml documnet:", 50);
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MetaCatUtil.debugMessage(newxmldoc, 50);
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DocInfoHandler dih = new DocInfoHandler();
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XMLReader docinfoParser = initParser(dih);
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URL docinfoUrl = new URL("https://" + docServer +
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"?server="+util.getLocalReplicationServerName()+
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"&action=getdocumentinfo&docid="+docid);
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//System.out.println("Sending message: " + docinfoUrl.toString());
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String docInfoStr = MetacatReplication.getURLContent(docinfoUrl);
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docinfoParser.parse(new InputSource(new StringReader(docInfoStr)));
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Hashtable docinfoHash = dih.getDocInfo();
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String docHomeServer = (String)docinfoHash.get("home_server");
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//int serverCode = MetacatReplication.getServerCode(docServer);
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//System.out.println("updating doc: " + docid +" action: "+ action);
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//docid should include rev number too
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String accnum=docid+util.getOption("accNumSeparator")+
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(String)docinfoHash.get("rev");
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//System.out.println("accnum: "+accnum);
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try
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{
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String newDocid = DocumentImpl.writeReplication(dbConn,
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new StringReader(newxmldoc),
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(String)docinfoHash.get("public_access"),
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null, /* the dtd text */
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action,
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accnum,
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(String)docinfoHash.get("user_owner"),
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null, /* null for groups[] */
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docHomeServer,
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false /* validate */);
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//increase usage
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dbConn.increaseUsageCount(1);
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MetacatReplication.replLog("wrote doc " + docid + " from " +
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docServer);
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/*System.out.println("wrote doc " + docid + " from " +
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docServer);*/
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}
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catch(Exception e)
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{
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System.out.println("error writing document in " +
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"ReplicationHandler.update: " + docid +
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": " + e.getMessage());
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}
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}//if for non-data file
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// this is for data file and metacat is configured to accetp datafile
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if(flag && dataFile
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&& (util.getOption("replicationacceptdata")).equals("on"))
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{
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//if the document needs to be updated or inserted, this is executed
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//String newxmldoc = MetacatReplication.getURLContent(u);
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DocInfoHandler dih = new DocInfoHandler();
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XMLReader docinfoParser = initParser(dih);
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URL docinfoUrl = new URL("https://" + docServer +
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"?server="+util.getLocalReplicationServerName()+
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"&action=getdocumentinfo&docid="+docid);
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//System.out.println("Sending message: " + docinfoUrl.toString());
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String docInfoStr = MetacatReplication.getURLContent(docinfoUrl);
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docinfoParser.parse(new InputSource(new StringReader(docInfoStr)));
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339
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Hashtable docinfoHash = dih.getDocInfo();
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String user = (String)docinfoHash.get("user_owner");
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String docName = (String)docinfoHash.get("docname");
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String docType = (String)docinfoHash.get("doctype");
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String docHomeServer = (String)docinfoHash.get("home_server");
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344
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345
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//int serverCode = MetacatReplication.getServerCode(docServer);
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346
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//System.out.println("updating doc: " + docid +" action: "+ action);
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347
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//docid should include rev number too
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348
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String accnum=docid+util.getOption("accNumSeparator")+
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349
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(String)docinfoHash.get("rev");
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350
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String datafilePath = util.getOption("datafilepath");
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351
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u = new URL("https://" + docServer + "?server="+
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352
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util.getLocalReplicationServerName()+
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353
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"&action=readdata&docid="+accnum);
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354
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//System.out.println("accnum: "+accnum);
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355
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try
|
356
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{
|
357
|
|
358
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//register data file into xml_documents table and wite data file
|
359
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//into file system
|
360
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if (u.openStream() != null)
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361
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{
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362
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DocumentImpl.writeDataFile(u.openStream(), datafilePath,
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363
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docName,docType, accnum, user,docHomeServer);
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364
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|
365
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MetacatReplication.replLog("wrote doc " + docid + " from " +
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366
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docServer);
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367
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}
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368
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else
|
369
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{
|
370
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continue;
|
371
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}
|
372
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/*System.out.println("wrote doc " + docid + " from " +
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373
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docServer);*/
|
374
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}
|
375
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catch(Exception e)
|
376
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{
|
377
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System.out.println("error writing document in " +
|
378
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"ReplicationHandler.update: " + docid +
|
379
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": " + e.getMessage());
|
380
|
}
|
381
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}//for datafile
|
382
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}//for update docs
|
383
|
|
384
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//handle deleted docs
|
385
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for(int k=0; k<d.size(); k++)
|
386
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{ //delete the deleted documents;
|
387
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Vector w = new Vector((Vector)d.elementAt(k));
|
388
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String docid = (String)w.elementAt(0);
|
389
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if(!alreadyDeleted(docid))
|
390
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{
|
391
|
|
392
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//because delete method docid should have rev number
|
393
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//so we just add one for it. This rev number is no sence.
|
394
|
String accnum=docid+util.getOption("accNumSeparator")+"1";
|
395
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//System.out.println("accnum: "+accnum);
|
396
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DocumentImpl.delete(accnum, null, null);
|
397
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MetacatReplication.replLog("doc " + docid + " deleted");
|
398
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}
|
399
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}//for delete docs
|
400
|
|
401
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//updated last_checked
|
402
|
keys = serverList.keys();
|
403
|
while(keys.hasMoreElements())
|
404
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{
|
405
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server = (String)(keys.nextElement());
|
406
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URL dateurl = new URL("https://" + server + "?server="+
|
407
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util.getLocalReplicationServerName()+"&action=gettime");
|
408
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String datexml = MetacatReplication.getURLContent(dateurl);
|
409
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MetaCatUtil.debugMessage("datexml: "+datexml, 40);
|
410
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if (datexml!=null && !datexml.equals(""))
|
411
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{
|
412
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String datestr = datexml.substring(11, datexml.indexOf('<', 11));
|
413
|
StringBuffer sql = new StringBuffer();
|
414
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sql.append("update xml_replication set last_checked = to_date('");
|
415
|
sql.append(datestr).append("', 'YY-MM-DD HH24:MI:SS') where ");
|
416
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sql.append("server like '").append(server).append("'");
|
417
|
//System.out.println("sql: " + sql.toString());
|
418
|
pstmt.close();
|
419
|
pstmt = dbConn.prepareStatement(sql.toString());
|
420
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//increase usage count
|
421
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dbConn.increaseUsageCount(1);
|
422
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pstmt.executeUpdate();
|
423
|
dbConn.commit();
|
424
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System.out.println("last_checked updated to " + datestr + " on " +
|
425
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server);
|
426
|
}
|
427
|
}//wile
|
428
|
}//for
|
429
|
}//try
|
430
|
catch(Exception e)
|
431
|
{
|
432
|
/*System.out.println("error in ReplicationHandler.update: " +
|
433
|
e.getMessage());*/
|
434
|
e.printStackTrace(System.out);
|
435
|
}
|
436
|
finally
|
437
|
{
|
438
|
try
|
439
|
{
|
440
|
pstmt.close();
|
441
|
}//try
|
442
|
catch(Exception ee)
|
443
|
{
|
444
|
MetaCatUtil.debugMessage("Error in ReplicationHandler.update to close"+
|
445
|
" pstmt: "+ee.getMessage(), 30);
|
446
|
}//catch
|
447
|
finally
|
448
|
{
|
449
|
DBConnectionPool.returnDBConnection(dbConn, serialNumber);
|
450
|
}//finally
|
451
|
}//finally
|
452
|
}//update
|
453
|
|
454
|
/**
|
455
|
* updates xml_catalog with entries from other servers.
|
456
|
*/
|
457
|
private void updateCatalog(Hashtable serverList)
|
458
|
{
|
459
|
DBConnection dbConn = null;
|
460
|
int serialNumber = -1;
|
461
|
PreparedStatement pstmt = null;
|
462
|
try
|
463
|
{
|
464
|
/*try
|
465
|
{
|
466
|
conn = util.openDBConnection();
|
467
|
}
|
468
|
catch(SQLException sqle)
|
469
|
{
|
470
|
try
|
471
|
{
|
472
|
conn = util.openDBConnection();
|
473
|
}
|
474
|
catch(SQLException sqlee)
|
475
|
{
|
476
|
try
|
477
|
{
|
478
|
conn = util.openDBConnection();
|
479
|
}
|
480
|
catch(SQLException sqleee)
|
481
|
{
|
482
|
System.out.println("error getting db connection in " +
|
483
|
"ReplicationHandler.update: " +
|
484
|
sqleee.getMessage());
|
485
|
}
|
486
|
}
|
487
|
}*/
|
488
|
|
489
|
dbConn=DBConnectionPool.
|
490
|
getDBConnection("ReplicationHandler.updateCatalog");
|
491
|
serialNumber=dbConn.getCheckOutSerialNumber();
|
492
|
String server;
|
493
|
Enumeration keys = serverList.keys();
|
494
|
while(keys.hasMoreElements())
|
495
|
{ //go through each server
|
496
|
server = (String)(keys.nextElement());
|
497
|
URL u = new URL("https://" + server + "?server="+
|
498
|
util.getLocalReplicationServerName()+"&action=getcatalog");
|
499
|
//System.out.println("sending message " + u.toString());
|
500
|
String catxml = MetacatReplication.getURLContent(u);
|
501
|
//System.out.println("catxml: " + catxml);
|
502
|
CatalogMessageHandler cmh = new CatalogMessageHandler();
|
503
|
XMLReader catparser = initParser(cmh);
|
504
|
catparser.parse(new InputSource(new StringReader(catxml)));
|
505
|
//parse the returned catalog xml and put it into a vector
|
506
|
Vector remoteCatalog = cmh.getCatalogVect();
|
507
|
|
508
|
String localcatxml = MetacatReplication.getCatalogXML();
|
509
|
//System.out.println("localcatxml: " + localcatxml);
|
510
|
cmh = new CatalogMessageHandler();
|
511
|
catparser = initParser(cmh);
|
512
|
catparser.parse(new InputSource(new StringReader(localcatxml)));
|
513
|
Vector localCatalog = cmh.getCatalogVect();
|
514
|
|
515
|
//now we have the catalog from the remote server and this local server
|
516
|
//we now need to compare the two and merge the differences.
|
517
|
//the comparison is base on the public_id fields which is the 4th
|
518
|
//entry in each row vector.
|
519
|
Vector publicId = new Vector();
|
520
|
for(int i=0; i<localCatalog.size(); i++)
|
521
|
{
|
522
|
Vector v = new Vector((Vector)localCatalog.elementAt(i));
|
523
|
//System.out.println("v1: " + v.toString());
|
524
|
publicId.add(new String((String)v.elementAt(3)));
|
525
|
//System.out.println("adding " + (String)v.elementAt(3));
|
526
|
}
|
527
|
|
528
|
for(int i=0; i<remoteCatalog.size(); i++)
|
529
|
{
|
530
|
Vector v = (Vector)remoteCatalog.elementAt(i);
|
531
|
//System.out.println("v2: " + v.toString());
|
532
|
//System.out.println("i: " + i);
|
533
|
//System.out.println("remoteCatalog.size(): " + remoteCatalog.size());
|
534
|
//System.out.println("publicID: " + publicId.toString());
|
535
|
//System.out.println("v.elementAt(3): " + (String)v.elementAt(3));
|
536
|
if(!publicId.contains(v.elementAt(3)))
|
537
|
{ //so we don't have this public id in our local table so we need to
|
538
|
//add it.
|
539
|
//System.out.println("in if");
|
540
|
StringBuffer sql = new StringBuffer();
|
541
|
sql.append("insert into xml_catalog (entry_type, source_doctype, ");
|
542
|
sql.append("target_doctype, public_id, system_id) values (?,?,?,");
|
543
|
sql.append("?,?)");
|
544
|
//System.out.println("sql: " + sql.toString());
|
545
|
pstmt = dbConn.prepareStatement(sql.toString());
|
546
|
//increase usage count 1
|
547
|
dbConn.increaseUsageCount(1);
|
548
|
pstmt.setString(1, (String)v.elementAt(0));
|
549
|
pstmt.setString(2, (String)v.elementAt(1));
|
550
|
pstmt.setString(3, (String)v.elementAt(2));
|
551
|
pstmt.setString(4, (String)v.elementAt(3));
|
552
|
pstmt.setString(5, (String)v.elementAt(4));
|
553
|
pstmt.execute();
|
554
|
pstmt.close();
|
555
|
}
|
556
|
}
|
557
|
}
|
558
|
//conn.close();
|
559
|
}
|
560
|
catch(Exception e)
|
561
|
{
|
562
|
System.out.println("error in ReplicationHandler.updateCatalog: " +
|
563
|
e.getMessage());
|
564
|
e.printStackTrace(System.out);
|
565
|
}//catch
|
566
|
finally
|
567
|
{
|
568
|
try
|
569
|
{
|
570
|
pstmt.close();
|
571
|
}//try
|
572
|
catch (SQLException ee)
|
573
|
{
|
574
|
MetaCatUtil.debugMessage("Error in ReplicationHandler.updateCatalog "+
|
575
|
"to close pstmt: "+ee.getMessage(), 30);
|
576
|
}//catch
|
577
|
finally
|
578
|
{
|
579
|
DBConnectionPool.returnDBConnection(dbConn, serialNumber);
|
580
|
}//finally
|
581
|
}//finall
|
582
|
}
|
583
|
|
584
|
/**
|
585
|
* Method that returns true if docid has already been "deleted" from metacat.
|
586
|
* This method really implements a truth table for deleted documents
|
587
|
* The table is (a docid in one of the tables is represented by the X):
|
588
|
* xml_docs xml_revs deleted?
|
589
|
* ------------------------------------
|
590
|
* X X FALSE
|
591
|
* X _ FALSE
|
592
|
* _ X TRUE
|
593
|
* _ _ TRUE
|
594
|
*/
|
595
|
private static boolean alreadyDeleted(String docid)
|
596
|
{
|
597
|
DBConnection dbConn = null;
|
598
|
int serialNumber = -1;
|
599
|
PreparedStatement pstmt = null;
|
600
|
try
|
601
|
{
|
602
|
dbConn=DBConnectionPool.
|
603
|
getDBConnection("ReplicationHandler.alreadyDeleted");
|
604
|
serialNumber=dbConn.getCheckOutSerialNumber();
|
605
|
boolean xml_docs = false;
|
606
|
boolean xml_revs = false;
|
607
|
|
608
|
StringBuffer sb = new StringBuffer();
|
609
|
sb.append("select docid from xml_revisions where docid like '");
|
610
|
sb.append(docid).append("'");
|
611
|
pstmt = dbConn.prepareStatement(sb.toString());
|
612
|
pstmt.execute();
|
613
|
ResultSet rs = pstmt.getResultSet();
|
614
|
boolean tablehasrows = rs.next();
|
615
|
if(tablehasrows)
|
616
|
{
|
617
|
xml_revs = true;
|
618
|
}
|
619
|
|
620
|
sb = new StringBuffer();
|
621
|
sb.append("select docid from xml_documents where docid like '");
|
622
|
sb.append(docid).append("'");
|
623
|
pstmt.close();
|
624
|
pstmt = dbConn.prepareStatement(sb.toString());
|
625
|
//increase usage count
|
626
|
dbConn.increaseUsageCount(1);
|
627
|
pstmt.execute();
|
628
|
rs = pstmt.getResultSet();
|
629
|
tablehasrows = rs.next();
|
630
|
pstmt.close();
|
631
|
if(tablehasrows)
|
632
|
{
|
633
|
xml_docs = true;
|
634
|
}
|
635
|
|
636
|
if(xml_docs && xml_revs)
|
637
|
{
|
638
|
return false;
|
639
|
}
|
640
|
else if(xml_docs && !xml_revs)
|
641
|
{
|
642
|
return false;
|
643
|
}
|
644
|
else if(!xml_docs && xml_revs)
|
645
|
{
|
646
|
return true;
|
647
|
}
|
648
|
else if(!xml_docs && !xml_revs)
|
649
|
{
|
650
|
return true;
|
651
|
}
|
652
|
}
|
653
|
catch(Exception e)
|
654
|
{
|
655
|
System.out.println("error in ReplicationHandler.alreadyDeleted: " +
|
656
|
e.getMessage());
|
657
|
e.printStackTrace(System.out);
|
658
|
}
|
659
|
finally
|
660
|
{
|
661
|
try
|
662
|
{
|
663
|
pstmt.close();
|
664
|
}//try
|
665
|
catch (SQLException ee)
|
666
|
{
|
667
|
MetaCatUtil.debugMessage("Error in replicationHandler.alreadyDeleted "+
|
668
|
"to close pstmt: "+ee.getMessage(), 30);
|
669
|
}//catch
|
670
|
finally
|
671
|
{
|
672
|
DBConnectionPool.returnDBConnection(dbConn, serialNumber);
|
673
|
}//finally
|
674
|
}//finally
|
675
|
return false;
|
676
|
}
|
677
|
|
678
|
/**
|
679
|
* Checks to see if a document is already in the DB. Returns
|
680
|
* "UPDATE" if it is, "INSERT" if it isn't
|
681
|
*/
|
682
|
private static String getAction(String docid)
|
683
|
{
|
684
|
DBConnection dbConn = null;
|
685
|
int serialNumber = -1;
|
686
|
PreparedStatement pstmt = null;
|
687
|
try
|
688
|
{
|
689
|
dbConn=DBConnectionPool.
|
690
|
getDBConnection("ReplicationHandler.getAction");
|
691
|
serialNumber=dbConn.getCheckOutSerialNumber();
|
692
|
//MetaCatUtil util = new MetaCatUtil();
|
693
|
StringBuffer sql = new StringBuffer();
|
694
|
sql.append("select docid from xml_documents where docid like '");
|
695
|
sql.append(docid).append("'");
|
696
|
//Connection conn = util.openDBConnection();
|
697
|
pstmt = dbConn.prepareStatement(sql.toString());
|
698
|
pstmt.execute();
|
699
|
ResultSet rs = pstmt.getResultSet();
|
700
|
|
701
|
if(rs.next())
|
702
|
{
|
703
|
pstmt.close();
|
704
|
//conn.close();
|
705
|
return "UPDATE";
|
706
|
}
|
707
|
else
|
708
|
{
|
709
|
pstmt.close();
|
710
|
//conn.close();
|
711
|
return "INSERT";
|
712
|
}
|
713
|
}
|
714
|
catch(Exception e)
|
715
|
{
|
716
|
System.out.println("error in replicationHandler.getAction: " +
|
717
|
e.getMessage());
|
718
|
}
|
719
|
finally
|
720
|
{
|
721
|
try
|
722
|
{
|
723
|
pstmt.close();
|
724
|
}
|
725
|
catch (SQLException sqlE)
|
726
|
{
|
727
|
MetaCatUtil.debugMessage("error in replicationHandler.getAction: " +
|
728
|
"to close pstmt: "+ sqlE.getMessage(), 30);
|
729
|
}
|
730
|
finally
|
731
|
{
|
732
|
DBConnectionPool.returnDBConnection(dbConn, serialNumber);
|
733
|
}
|
734
|
}//finally
|
735
|
return "";
|
736
|
}
|
737
|
|
738
|
/**
|
739
|
* Method to query xml_replication and build a hashtable of each server
|
740
|
* and it's last update time.
|
741
|
* @param conn a connection to the database
|
742
|
*/
|
743
|
public static Hashtable buildServerList()
|
744
|
{
|
745
|
DBConnection dbConn = null;
|
746
|
int serialNumber = -1;
|
747
|
Hashtable sl = new Hashtable();
|
748
|
PreparedStatement pstmt = null;
|
749
|
try
|
750
|
{
|
751
|
dbConn=DBConnectionPool.
|
752
|
getDBConnection("ReplicationHandler.buildServerList");
|
753
|
serialNumber=dbConn.getCheckOutSerialNumber();
|
754
|
pstmt = dbConn.prepareStatement("select server, last_checked, replicate "+
|
755
|
"from xml_replication");
|
756
|
pstmt.execute();
|
757
|
ResultSet rs = pstmt.getResultSet();
|
758
|
boolean tableHasRows = rs.next();
|
759
|
while(tableHasRows)
|
760
|
{
|
761
|
if(rs.getInt(3) == 1)
|
762
|
{//only put the server in the list if the replicate flag is true
|
763
|
String server = rs.getString(1);
|
764
|
String last_checked = rs.getString(2);
|
765
|
if(!server.equals("localhost"))
|
766
|
{
|
767
|
sl.put(server, last_checked);
|
768
|
}
|
769
|
}
|
770
|
tableHasRows = rs.next();
|
771
|
}
|
772
|
pstmt.close();
|
773
|
}
|
774
|
catch(Exception e)
|
775
|
{
|
776
|
System.out.println("error in replicationHandler.buildServerList(): " +
|
777
|
e.getMessage());
|
778
|
}
|
779
|
finally
|
780
|
{
|
781
|
try
|
782
|
{
|
783
|
pstmt.close();
|
784
|
}//try
|
785
|
catch (SQLException sqlE)
|
786
|
{
|
787
|
MetaCatUtil.debugMessage("Error in ReplicationHandler.buildServerList: "
|
788
|
+sqlE.getMessage());
|
789
|
}//catch
|
790
|
finally
|
791
|
{
|
792
|
DBConnectionPool.returnDBConnection(dbConn, serialNumber);
|
793
|
}//finally
|
794
|
}//finally
|
795
|
|
796
|
return sl;
|
797
|
}
|
798
|
/**
|
799
|
* Method to get a host server information for given docid
|
800
|
* @param conn a connection to the database
|
801
|
*/
|
802
|
public static Hashtable getHomeServer(String docId)
|
803
|
{
|
804
|
Hashtable sl = new Hashtable();
|
805
|
DBConnection dbConn = null;
|
806
|
int serialNumber = -1;
|
807
|
//MetaCatUtil ut=new MetaCatUtil();
|
808
|
docId=MetaCatUtil.getDocIdFromString(docId);
|
809
|
PreparedStatement pstmt=null;
|
810
|
int serverLocation;
|
811
|
try
|
812
|
{
|
813
|
//get conection
|
814
|
dbConn=DBConnectionPool.
|
815
|
getDBConnection("ReplicationHandler.getHomeServer");
|
816
|
serialNumber=dbConn.getCheckOutSerialNumber();
|
817
|
//get a server location from xml_document table
|
818
|
pstmt=dbConn.prepareStatement("select server_location from xml_documents "
|
819
|
+"where docid = ?");
|
820
|
pstmt.setString(1, docId);
|
821
|
pstmt.execute();
|
822
|
ResultSet serverName = pstmt.getResultSet();
|
823
|
//get a server location
|
824
|
if(serverName.next())
|
825
|
{
|
826
|
serverLocation=serverName.getInt(1);
|
827
|
pstmt.close();
|
828
|
}
|
829
|
else
|
830
|
{
|
831
|
pstmt.close();
|
832
|
//ut.returnConnection(conn);
|
833
|
return null;
|
834
|
}
|
835
|
pstmt=dbConn.prepareStatement("select server, last_checked, replicate " +
|
836
|
"from xml_replication where serverid = ?");
|
837
|
//increase usage count
|
838
|
dbConn.increaseUsageCount(1);
|
839
|
pstmt.setInt(1, serverLocation);
|
840
|
pstmt.execute();
|
841
|
ResultSet rs = pstmt.getResultSet();
|
842
|
boolean tableHasRows = rs.next();
|
843
|
if (tableHasRows)
|
844
|
{
|
845
|
|
846
|
String server = rs.getString(1);
|
847
|
String last_checked = rs.getString(2);
|
848
|
if(!server.equals("localhost"))
|
849
|
{
|
850
|
sl.put(server, last_checked);
|
851
|
}
|
852
|
|
853
|
}
|
854
|
else
|
855
|
{
|
856
|
pstmt.close();
|
857
|
//ut.returnConnection(conn);
|
858
|
return null;
|
859
|
}
|
860
|
pstmt.close();
|
861
|
}
|
862
|
catch(Exception e)
|
863
|
{
|
864
|
System.out.println("error in replicationHandler.getHomeServer(): " +
|
865
|
e.getMessage());
|
866
|
}
|
867
|
finally
|
868
|
{
|
869
|
try
|
870
|
{
|
871
|
pstmt.close();
|
872
|
//ut.returnConnection(conn);
|
873
|
}
|
874
|
catch (Exception ee)
|
875
|
{
|
876
|
MetaCatUtil.debugMessage("Eror irn rplicationHandler.getHomeServer() "+
|
877
|
"to close pstmt: "+ee.getMessage(), 30);
|
878
|
}
|
879
|
finally
|
880
|
{
|
881
|
DBConnectionPool.returnDBConnection(dbConn, serialNumber);
|
882
|
}
|
883
|
|
884
|
}//finally
|
885
|
return sl;
|
886
|
}
|
887
|
|
888
|
/**
|
889
|
* Returns a server location given a accnum
|
890
|
* @param accNum , given accNum for a document
|
891
|
*
|
892
|
*/
|
893
|
public static int getServerLocation(String accNum) throws Exception
|
894
|
{
|
895
|
DBConnection dbConn = null;
|
896
|
int serialNumber = -1;
|
897
|
PreparedStatement pstmt = null;
|
898
|
int serverCode = 1;
|
899
|
//MetaCatUtil ut = new MetaCatUtil();
|
900
|
String docId=MetaCatUtil.getDocIdFromString(accNum);
|
901
|
|
902
|
try
|
903
|
{
|
904
|
|
905
|
//conn = ut.openDBConnection();
|
906
|
//get conection
|
907
|
dbConn=DBConnectionPool.
|
908
|
getDBConnection("ReplicationHandler.getServerLocation");
|
909
|
serialNumber=dbConn.getCheckOutSerialNumber();
|
910
|
pstmt=dbConn.prepareStatement("SELECT server_location FROM xml_documents "
|
911
|
+ "WHERE docid LIKE '" + docId + "'");
|
912
|
pstmt.execute();
|
913
|
ResultSet rs = pstmt.getResultSet();
|
914
|
boolean tablehasrows = rs.next();
|
915
|
//If a document is find, return the server location for it
|
916
|
if ( tablehasrows )
|
917
|
{
|
918
|
serverCode = rs.getInt(1);
|
919
|
pstmt.close();
|
920
|
//conn.close();
|
921
|
return serverCode;
|
922
|
}
|
923
|
//if couldn't find in xml_documents table, we think server code is 1
|
924
|
//(this is new document)
|
925
|
else
|
926
|
{
|
927
|
pstmt.close();
|
928
|
//conn.close();
|
929
|
return serverCode;
|
930
|
}
|
931
|
|
932
|
}
|
933
|
catch(Exception e)
|
934
|
{
|
935
|
|
936
|
throw e;
|
937
|
|
938
|
}
|
939
|
finally
|
940
|
{
|
941
|
try
|
942
|
{
|
943
|
pstmt.close();
|
944
|
//conn.close();
|
945
|
|
946
|
}
|
947
|
catch(Exception ee)
|
948
|
{
|
949
|
MetaCatUtil.debugMessage("Erorr in Replication.getServerLocation "+
|
950
|
"to close pstmt"+ee.getMessage(), 30);
|
951
|
}
|
952
|
finally
|
953
|
{
|
954
|
DBConnectionPool.returnDBConnection(dbConn, serialNumber);
|
955
|
}//finally
|
956
|
}//finally
|
957
|
//return serverCode;
|
958
|
}
|
959
|
|
960
|
|
961
|
|
962
|
/**
|
963
|
* Method to initialize the message parser
|
964
|
*/
|
965
|
public static XMLReader initParser(DefaultHandler dh)
|
966
|
throws Exception
|
967
|
{
|
968
|
XMLReader parser = null;
|
969
|
|
970
|
try {
|
971
|
ContentHandler chandler = dh;
|
972
|
|
973
|
// Get an instance of the parser
|
974
|
MetaCatUtil util = new MetaCatUtil();
|
975
|
String parserName = util.getOption("saxparser");
|
976
|
parser = XMLReaderFactory.createXMLReader(parserName);
|
977
|
|
978
|
// Turn off validation
|
979
|
parser.setFeature("http://xml.org/sax/features/validation", false);
|
980
|
|
981
|
parser.setContentHandler((ContentHandler)chandler);
|
982
|
parser.setErrorHandler((ErrorHandler)chandler);
|
983
|
|
984
|
} catch (Exception e) {
|
985
|
throw e;
|
986
|
}
|
987
|
|
988
|
return parser;
|
989
|
}
|
990
|
|
991
|
|
992
|
}
|
993
|
|