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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: bojilova $'
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* '$Date: 2001-09-20 13:14:57 -0700 (Thu, 20 Sep 2001) $'
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* '$Revision: 837 $'
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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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sqleee.getMessage());
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}
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}
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}
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serverList = buildServerList(conn);
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updateCatalog(serverList);
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update(serverList);
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conn.close();
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}
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catch (Exception e)
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{
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System.out.println("Error in replicationHandler.run(): " + e.getMessage());
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}
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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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Connection conn = null;
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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.update: " +
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sqleee.getMessage());
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}
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}
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}
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}
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catch(Exception e)
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{
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System.out.println("error in ReplicationHandler.update: " +
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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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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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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 + "?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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responses.add(result);
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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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Vector v = new Vector(message.getUpdatesVect());
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//System.out.println("v: " + v.toString());
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Vector d = new Vector(message.getDeletesVect());
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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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for(int j=0; j<v.size(); j++)
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{
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Vector w = new Vector((Vector)(v.elementAt(j)));
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//System.out.println("w: " + w.toString());
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String docid = (String)w.elementAt(0);
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//System.out.println("docid: " + docid);
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int rev = Integer.parseInt((String)w.elementAt(1));
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//System.out.println("rev: " + rev);
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String docServer = (String)w.elementAt(2);
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//System.out.println("docServer: " + docServer);
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pstmt = conn.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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if(flag)
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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 + "?action=read&docid=" +
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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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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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"?action=getdocumentinfo&docid=" +
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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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int serverCode = MetacatReplication.getServerCode(docServer);
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System.out.println("updating doc: " + docid + " action: "+ action);
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try
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{
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String newDocid = DocumentImpl.write(conn,
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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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docid,
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(String)docinfoHash.get("user_owner"),
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null, /* null for groups[] */
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serverCode,
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true, /* override */
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false /* validate */);
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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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}
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}
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for(int k=0; k<d.size(); k++)
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{ //delete the deleted documents;
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Vector w = new Vector((Vector)d.elementAt(k));
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String docid = (String)w.elementAt(0);
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if(!alreadyDeleted(docid, conn))
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{
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DocumentImpl.delete(conn, docid, null, null);
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System.out.println("Document " + docid + " deleted.");
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MetacatReplication.replLog("doc " + docid + " deleted");
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}
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}
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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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URL dateurl = new URL("https://" + server + "?action=gettime");
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String datexml = MetacatReplication.getURLContent(dateurl);
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String datestr = datexml.substring(11, datexml.indexOf('<', 11));
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StringBuffer sql = new StringBuffer();
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sql.append("update xml_replication set last_checked = to_date('");
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sql.append(datestr).append("', 'YY-MM-DD HH24:MI:SS') where ");
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sql.append("server like '").append(server).append("'");
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//System.out.println("sql: " + sql.toString());
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pstmt.close();
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pstmt = conn.prepareStatement(sql.toString());
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pstmt.executeUpdate();
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//conn.commit();
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System.out.println("last_checked updated to " + datestr + " on " +
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server);
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}
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}
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}
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catch(Exception e)
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{
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System.out.println("error in ReplicationHandler.update: " +
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e.getMessage());
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e.printStackTrace(System.out);
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}
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finally
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{
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try
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{
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pstmt.close();
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}
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catch(Exception ee) {}
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}
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}
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347
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/**
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* updates xml_catalog with entries from other servers.
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*/
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private void updateCatalog(Hashtable serverList)
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{
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Connection conn = null;
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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.update: " +
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sqleee.getMessage());
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}
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378
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}
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379
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}
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String server;
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Enumeration keys = serverList.keys();
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while(keys.hasMoreElements())
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{ //go through each server
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server = (String)(keys.nextElement());
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URL u = new URL("https://" + server + "?action=getcatalog");
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System.out.println("sending message " + u.toString());
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String catxml = MetacatReplication.getURLContent(u);
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//System.out.println("catxml: " + catxml);
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CatalogMessageHandler cmh = new CatalogMessageHandler();
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XMLReader catparser = initParser(cmh);
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catparser.parse(new InputSource(new StringReader(catxml)));
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//parse the returned catalog xml and put it into a vector
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Vector remoteCatalog = cmh.getCatalogVect();
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String localcatxml = MetacatReplication.getCatalogXML();
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//System.out.println("localcatxml: " + localcatxml);
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cmh = new CatalogMessageHandler();
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catparser = initParser(cmh);
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catparser.parse(new InputSource(new StringReader(localcatxml)));
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Vector localCatalog = cmh.getCatalogVect();
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|
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//now we have the catalog from the remote server and this local server
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//we now need to compare the two and merge the differences.
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//the comparison is base on the public_id fields which is the 4th
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//entry in each row vector.
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Vector publicId = new Vector();
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for(int i=0; i<localCatalog.size(); i++)
|
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{
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Vector v = new Vector((Vector)localCatalog.elementAt(i));
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//System.out.println("v1: " + v.toString());
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publicId.add(new String((String)v.elementAt(3)));
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//System.out.println("adding " + (String)v.elementAt(3));
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}
|
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|
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for(int i=0; i<remoteCatalog.size(); i++)
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{
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Vector v = (Vector)remoteCatalog.elementAt(i);
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//System.out.println("v2: " + v.toString());
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//System.out.println("i: " + i);
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//System.out.println("remoteCatalog.size(): " + remoteCatalog.size());
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//System.out.println("publicID: " + publicId.toString());
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//System.out.println("v.elementAt(3): " + (String)v.elementAt(3));
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if(!publicId.contains(v.elementAt(3)))
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{ //so we don't have this public id in our local table so we need to
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//add it.
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//System.out.println("in if");
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StringBuffer sql = new StringBuffer();
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sql.append("insert into xml_catalog (entry_type, source_doctype, ");
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sql.append("target_doctype, public_id, system_id) values (?,?,?,");
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sql.append("?,?)");
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431
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//System.out.println("sql: " + sql.toString());
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432
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PreparedStatement pstmt = conn.prepareStatement(sql.toString());
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pstmt.setString(1, (String)v.elementAt(0));
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pstmt.setString(2, (String)v.elementAt(1));
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435
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pstmt.setString(3, (String)v.elementAt(2));
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436
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pstmt.setString(4, (String)v.elementAt(3));
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437
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pstmt.setString(5, (String)v.elementAt(4));
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438
|
pstmt.execute();
|
439
|
pstmt.close();
|
440
|
}
|
441
|
}
|
442
|
}
|
443
|
}
|
444
|
catch(Exception e)
|
445
|
{
|
446
|
System.out.println("error in ReplicationHandler.updateCatalog: " +
|
447
|
e.getMessage());
|
448
|
e.printStackTrace(System.out);
|
449
|
}
|
450
|
}
|
451
|
|
452
|
/**
|
453
|
* Method that returns true if docid has already been "deleted" from metacat.
|
454
|
* This method really implements a truth table for deleted documents
|
455
|
* The table is (a docid in one of the tables is represented by the X):
|
456
|
* xml_docs xml_revs deleted?
|
457
|
* ------------------------------------
|
458
|
* X X FALSE
|
459
|
* X _ FALSE
|
460
|
* _ X TRUE
|
461
|
* _ _ TRUE
|
462
|
*/
|
463
|
private static boolean alreadyDeleted(String docid, Connection conn)
|
464
|
{
|
465
|
try
|
466
|
{
|
467
|
boolean xml_docs = false;
|
468
|
boolean xml_revs = false;
|
469
|
|
470
|
StringBuffer sb = new StringBuffer();
|
471
|
sb.append("select docid from xml_revisions where docid like '");
|
472
|
sb.append(docid).append("'");
|
473
|
PreparedStatement pstmt = conn.prepareStatement(sb.toString());
|
474
|
pstmt.execute();
|
475
|
ResultSet rs = pstmt.getResultSet();
|
476
|
boolean tablehasrows = rs.next();
|
477
|
if(tablehasrows)
|
478
|
{
|
479
|
xml_revs = true;
|
480
|
}
|
481
|
|
482
|
sb = new StringBuffer();
|
483
|
sb.append("select docid from xml_documents where docid like '");
|
484
|
sb.append(docid).append("'");
|
485
|
pstmt.close();
|
486
|
pstmt = conn.prepareStatement(sb.toString());
|
487
|
pstmt.execute();
|
488
|
rs = pstmt.getResultSet();
|
489
|
tablehasrows = rs.next();
|
490
|
pstmt.close();
|
491
|
if(tablehasrows)
|
492
|
{
|
493
|
xml_docs = true;
|
494
|
}
|
495
|
|
496
|
if(xml_docs && xml_revs)
|
497
|
{
|
498
|
return false;
|
499
|
}
|
500
|
else if(xml_docs && !xml_revs)
|
501
|
{
|
502
|
return false;
|
503
|
}
|
504
|
else if(!xml_docs && xml_revs)
|
505
|
{
|
506
|
return true;
|
507
|
}
|
508
|
else if(!xml_docs && !xml_revs)
|
509
|
{
|
510
|
return true;
|
511
|
}
|
512
|
}
|
513
|
catch(Exception e)
|
514
|
{
|
515
|
System.out.println("error in ReplicationHandler.alreadyDeleted: " +
|
516
|
e.getMessage());
|
517
|
e.printStackTrace(System.out);
|
518
|
}
|
519
|
finally
|
520
|
{
|
521
|
|
522
|
}
|
523
|
return false;
|
524
|
}
|
525
|
|
526
|
/**
|
527
|
* Checks to see if a document is already in the DB. Returns
|
528
|
* "UPDATE" if it is, "INSERT" if it isn't
|
529
|
*/
|
530
|
private static String getAction(String docid)
|
531
|
{
|
532
|
try
|
533
|
{
|
534
|
MetaCatUtil util = new MetaCatUtil();
|
535
|
StringBuffer sql = new StringBuffer();
|
536
|
sql.append("select docid from xml_documents where docid like '");
|
537
|
sql.append(docid).append("'");
|
538
|
Connection conn = util.openDBConnection();
|
539
|
PreparedStatement pstmt = conn.prepareStatement(sql.toString());
|
540
|
pstmt.execute();
|
541
|
ResultSet rs = pstmt.getResultSet();
|
542
|
|
543
|
if(rs.next())
|
544
|
{
|
545
|
pstmt.close();
|
546
|
conn.close();
|
547
|
return "UPDATE";
|
548
|
}
|
549
|
else
|
550
|
{
|
551
|
pstmt.close();
|
552
|
conn.close();
|
553
|
return "INSERT";
|
554
|
}
|
555
|
}
|
556
|
catch(Exception e)
|
557
|
{
|
558
|
System.out.println("error in replicationHandler.getAction: " +
|
559
|
e.getMessage());
|
560
|
}
|
561
|
return "";
|
562
|
}
|
563
|
|
564
|
/**
|
565
|
* Method to query xml_replication and build a hashtable of each server
|
566
|
* and it's last update time.
|
567
|
* @param conn a connection to the database
|
568
|
*/
|
569
|
public static Hashtable buildServerList(Connection conn)
|
570
|
{
|
571
|
Hashtable sl = new Hashtable();
|
572
|
PreparedStatement pstmt;
|
573
|
try
|
574
|
{
|
575
|
pstmt = conn.prepareStatement("select server, last_checked, replicate " +
|
576
|
"from xml_replication");
|
577
|
pstmt.execute();
|
578
|
ResultSet rs = pstmt.getResultSet();
|
579
|
boolean tableHasRows = rs.next();
|
580
|
while(tableHasRows)
|
581
|
{
|
582
|
if(rs.getInt(3) == 1)
|
583
|
{//only put the server in the list if the replicate flag is true
|
584
|
String server = rs.getString(1);
|
585
|
String last_checked = rs.getString(2);
|
586
|
if(!server.equals("localhost"))
|
587
|
{
|
588
|
sl.put(server, last_checked);
|
589
|
}
|
590
|
}
|
591
|
tableHasRows = rs.next();
|
592
|
}
|
593
|
pstmt.close();
|
594
|
}
|
595
|
catch(Exception e)
|
596
|
{
|
597
|
System.out.println("error in replicationHandler.buildServerList(): " +
|
598
|
e.getMessage());
|
599
|
}
|
600
|
return sl;
|
601
|
}
|
602
|
|
603
|
/**
|
604
|
* Method to initialize the message parser
|
605
|
*/
|
606
|
public static XMLReader initParser(DefaultHandler dh)
|
607
|
throws Exception
|
608
|
{
|
609
|
XMLReader parser = null;
|
610
|
|
611
|
try {
|
612
|
ContentHandler chandler = dh;
|
613
|
|
614
|
// Get an instance of the parser
|
615
|
MetaCatUtil util = new MetaCatUtil();
|
616
|
String parserName = util.getOption("saxparser");
|
617
|
parser = XMLReaderFactory.createXMLReader(parserName);
|
618
|
|
619
|
// Turn off validation
|
620
|
parser.setFeature("http://xml.org/sax/features/validation", false);
|
621
|
|
622
|
parser.setContentHandler((ContentHandler)chandler);
|
623
|
parser.setErrorHandler((ErrorHandler)chandler);
|
624
|
|
625
|
} catch (Exception e) {
|
626
|
throw e;
|
627
|
}
|
628
|
|
629
|
return parser;
|
630
|
}
|
631
|
}
|