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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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*
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* '$Author: tao $'
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* '$Date: 2007-04-13 11:49:52 -0700 (Fri, 13 Apr 2007) $'
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* '$Revision: 3234 $'
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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 edu.ucsb.nceas.dbadapter.AbstractDatabase;
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import java.sql.*;
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import java.util.*;
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import java.util.Date;
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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.apache.log4j.Logger;
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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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ReplicationServerList serverList = null;
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//PrintWriter out;
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private static final AbstractDatabase dbAdapter = MetaCatUtil.dbAdapter;
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private static Logger logMetacat = Logger.getLogger(ReplicationHandler.class);
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private static int DOCINSERTNUMBER = 1;
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private static int DOCERRORNUMBER = 1;
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private static int REVINSERTNUMBER = 1;
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private static int REVERRORNUMBER = 1;
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public ReplicationHandler()
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{
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//this.out = o;
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serverList = new ReplicationServerList();
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}
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public ReplicationHandler(int serverCheckCode)
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{
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//this.out = o;
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this.serverCheckCode = serverCheckCode;
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serverList = new ReplicationServerList();
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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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//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();
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update();
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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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logMetacat.error("Error in replicationHandler.run():"
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+e.getMessage());
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e.printStackTrace();
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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()
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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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ReplicationServer replServer = null; // Variable to store the
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// ReplicationServer got from
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// Server list
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String server = null; // Variable to store server name
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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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XMLReader parser;
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URL u;
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try
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{
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parser = initParser(message);
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}
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catch (Exception e)
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{
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MetacatReplication.replErrorLog("Failed to replicate becaue couldn't "+
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" initParser for message and" +e.getMessage());
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logMetacat.error("Failed to replicate becaue couldn't " +
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" initParser for message and " +e.getMessage());
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// stop replication
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return;
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}
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//Check for every server in server list to get updated list and put
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// them in to response
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for (int i=0; i<serverList.size(); i++)
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{
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// Get ReplicationServer object from server list
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replServer = serverList.serverAt(i);
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// Get server name from ReplicationServer object
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server = replServer.getServerName().trim();
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String result = null;
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MetacatReplication.replLog("full update started to: " + server);
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// Send command to that server to get updated docid information
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try
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{
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u = new URL("https://" + server + "?server="
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+util.getLocalReplicationServerName()+"&action=update");
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logMetacat.info("Sending infomation " +u.toString());
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result = MetacatReplication.getURLContent(u);
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}
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catch (Exception e)
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{
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MetacatReplication.replErrorLog("Failed to get updated doc list "+
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"for server " + server + " because "+e.getMessage());
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logMetacat.error( "Failed to get updated doc list "+
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"for server " + server + " because "+e.getMessage());
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continue;
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}
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logMetacat.info("docid: "+server+" "+result);
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//check if result have error or not, if has skip it.
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if (result.indexOf("<error>")!=-1 && result.indexOf("</error>")!=-1)
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{
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MetacatReplication.replErrorLog("Failed to get updated doc list "+
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"for server " + server + " because "+result);
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logMetacat.info( "Failed to get updated doc list "+
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"for server " + server + " because "+result);
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continue;
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}
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//Add result to vector
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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, metacat don't need do anything
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if (responses==null || responses.isEmpty())
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{
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MetacatReplication.replErrorLog("No updated doc list for "+
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"every server and failed to replicate");
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logMetacat.info( "No updated doc list for "+
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"every server and failed to replicate");
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return;
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}
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logMetacat.info("Responses from remote metacat about updated "+
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"document information: "+ responses.toString());
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// go through response vector(it contains updated vector and delete vector
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for(int i=0; i<responses.size(); i++)
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{
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try
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{
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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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}
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catch(Exception e)
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{
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MetacatReplication.replErrorLog("Couldn't parse one responses "+
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"because "+ e.getMessage());
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logMetacat.error("Couldn't parse one responses "+
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"because "+ e.getMessage());
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continue;
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}
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//v is the list of updated documents
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Vector updateList = new Vector(message.getUpdatesVect());
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MetacatReplication.replLog("The document list size is "+updateList.size());
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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 deleteList = new Vector(message.getDeletesVect());
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//System.out.println("d: " + d.toString());
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logMetacat.info("Update vector size: "+ updateList.size());
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logMetacat.info("Delete vector size: "+ deleteList.size());
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MetacatReplication.replLog("The delete document list size is "+deleteList.size());
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// go though every element in updated document vector
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handleDocList(updateList, DocumentImpl.DOCUMENTTABLE);
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//handle deleted docs
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for(int k=0; k<deleteList.size(); k++)
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{ //delete the deleted documents;
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Vector w = new Vector((Vector)deleteList.elementAt(k));
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String docId = (String)w.elementAt(0);
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try
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{
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handleDeleteSingleDocument(docId, server);
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}
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catch (Exception ee)
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{
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continue;
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}
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}//for delete docs
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// handle replicate doc in xml_revision
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Vector revisionList = new Vector(message.getRevisionsVect());
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MetacatReplication.replLog("The revision document list size is "+revisionList.size());
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handleDocList(revisionList, DocumentImpl.REVISIONTABLE);
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DOCINSERTNUMBER = 1;
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DOCERRORNUMBER = 1;
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REVINSERTNUMBER = 1;
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REVERRORNUMBER = 1;
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}//for response
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//updated last_checked
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for (int i=0;i<serverList.size(); i++)
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{
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// Get ReplicationServer object from server list
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replServer = serverList.serverAt(i);
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try
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{
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updateLastCheckTimeForSingleServer(replServer);
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}
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catch(Exception e)
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{
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continue;
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}
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}//for
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}//update
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/* Handle replicate single xml document*/
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private void handleSingleXMLDocument(String remoteserver, String actions,
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String accNumber, String tableName)
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throws Exception
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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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// Get DBConnection from pool
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dbConn=DBConnectionPool.
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getDBConnection("ReplicationHandler.handleSingleXMLDocument");
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serialNumber=dbConn.getCheckOutSerialNumber();
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//if the document needs to be updated or inserted, this is executed
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String readDocURLString = "https://" + remoteserver + "?server="+
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util.getLocalReplicationServerName()+"&action=read&docid="+accNumber;
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readDocURLString = MetaCatUtil.replaceWhiteSpaceForURL(readDocURLString);
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URL u = new URL(readDocURLString);
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// Get docid content
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String newxmldoc = MetacatReplication.getURLContent(u);
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// If couldn't get skip it
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if ( newxmldoc.indexOf("<error>")!= -1 && newxmldoc.indexOf("</error>")!=-1)
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{
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throw new Exception(newxmldoc);
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}
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//logMetacat.info("xml documnet:");
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//logMetacat.info(newxmldoc);
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// Try get the docid info from remote server
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DocInfoHandler dih = new DocInfoHandler();
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XMLReader docinfoParser = initParser(dih);
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String docInfoURLStr = "https://" + remoteserver +
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"?server="+util.getLocalReplicationServerName()+
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"&action=getdocumentinfo&docid="+accNumber;
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docInfoURLStr = MetaCatUtil.replaceWhiteSpaceForURL(docInfoURLStr);
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URL docinfoUrl = new URL(docInfoURLStr);
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logMetacat.info("Sending message: " +
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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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// Get home server of the docid
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String docHomeServer = (String)docinfoHash.get("home_server");
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logMetacat.info("doc home server in repl: "+docHomeServer);
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String createdDate = (String)docinfoHash.get("date_created");
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String updatedDate = (String)docinfoHash.get("date_updated");
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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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logMetacat.info("docid in repl: "+accNumber);
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String docType = (String)docinfoHash.get("doctype");
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logMetacat.info("doctype in repl: "+docType);
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String parserBase = null;
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// this for eml2 and we need user eml2 parser
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if (docType != null && (docType.trim()).equals(DocumentImpl.EML2_0_0NAMESPACE))
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{
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parserBase = DocumentImpl.EML200;
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}
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else if (docType != null && (docType.trim()).equals(DocumentImpl.EML2_0_1NAMESPACE))
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{
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parserBase = DocumentImpl.EML200;
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}
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else if (docType != null && (docType.trim()).equals(DocumentImpl.EML2_1_0NAMESPACE))
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{
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parserBase = DocumentImpl.EML210;
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}
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// Write the document into local host
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DocumentImplWrapper wrapper = new DocumentImplWrapper(parserBase, false);
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String newDocid = wrapper.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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actions,
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accNumber,
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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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remoteserver, tableName, true,// true is for time replication
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createdDate,
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updatedDate);
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logMetacat.info("Successfully replicated doc " + accNumber);
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if (tableName.equals(DocumentImpl.DOCUMENTTABLE))
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{
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MetacatReplication.replLog("" +DOCINSERTNUMBER + " Wrote xml doc " + accNumber +
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" into "+tableName + " from " +
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remoteserver);
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DOCINSERTNUMBER++;
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}
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else
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{
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MetacatReplication.replLog("" +REVINSERTNUMBER + " Wrote xml doc " + accNumber +
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" into "+tableName + " from " +
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remoteserver);
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REVINSERTNUMBER++;
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}
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String ip = getIpFromURL(u);
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EventLog.getInstance().log(ip, MetacatReplication.REPLICATIONUSER, accNumber, actions);
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380
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381
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}//try
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catch(Exception e)
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{
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385
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if (tableName.equals(DocumentImpl.DOCUMENTTABLE))
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{
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MetacatReplication.replErrorLog("" +DOCERRORNUMBER + " Failed to write xml doc " + accNumber +
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" into "+tableName + " from " +
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remoteserver + " because "+e.getMessage());
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DOCERRORNUMBER++;
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}
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else
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{
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MetacatReplication.replErrorLog("" +REVERRORNUMBER + " Failed to write xml doc " + accNumber +
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" into "+tableName + " from " +
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remoteserver +" because "+e.getMessage());
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REVERRORNUMBER++;
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}
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logMetacat.error("Failed to write doc " + accNumber +
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" into db because " +e.getMessage());
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throw e;
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}
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finally
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{
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//return DBConnection
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DBConnectionPool.returnDBConnection(dbConn, serialNumber);
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}//finally
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}
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410
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411
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412
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|
413
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/* Handle replicate single xml document*/
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414
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private void handleSingleDataFile(String remoteserver, String actions,
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String accNumber, String tableName)
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throws Exception
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{
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logMetacat.info("Try to replicate data file: "+accNumber);
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DBConnection dbConn = null;
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int serialNumber = -1;
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421
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try
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{
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// Get DBConnection from pool
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dbConn=DBConnectionPool.
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getDBConnection("ReplicationHandler.handleSinlgeDataFile");
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serialNumber=dbConn.getCheckOutSerialNumber();
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// Try get docid info from remote server
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DocInfoHandler dih = new DocInfoHandler();
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XMLReader docinfoParser = initParser(dih);
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430
|
String docInfoURLString = "https://" + remoteserver +
|
431
|
"?server="+util.getLocalReplicationServerName()+
|
432
|
"&action=getdocumentinfo&docid="+accNumber;
|
433
|
docInfoURLString = MetaCatUtil.replaceWhiteSpaceForURL(docInfoURLString);
|
434
|
URL docinfoUrl = new URL(docInfoURLString);
|
435
|
|
436
|
String docInfoStr = MetacatReplication.getURLContent(docinfoUrl);
|
437
|
docinfoParser.parse(new InputSource(new StringReader(docInfoStr)));
|
438
|
Hashtable docinfoHash = dih.getDocInfo();
|
439
|
// Get doicd owner
|
440
|
String user = (String)docinfoHash.get("user_owner");
|
441
|
// Get docid name (such as acl or dataset)
|
442
|
String docName = (String)docinfoHash.get("docname");
|
443
|
// Get doc type (eml public id)
|
444
|
String docType = (String)docinfoHash.get("doctype");
|
445
|
// Get docid home sever. it might be different to remoteserver
|
446
|
// becuause of hub feature
|
447
|
String docHomeServer = (String)docinfoHash.get("home_server");
|
448
|
String createdDate = (String)docinfoHash.get("date_created");
|
449
|
String updatedDate = (String)docinfoHash.get("date_updated");
|
450
|
//docid should include rev number too
|
451
|
/*String accnum=docId+util.getOption("accNumSeparator")+
|
452
|
(String)docinfoHash.get("rev");*/
|
453
|
|
454
|
|
455
|
String datafilePath = util.getOption("datafilepath");
|
456
|
// Get data file content
|
457
|
String readDataURLString = "https://" + remoteserver + "?server="+
|
458
|
util.getLocalReplicationServerName()+
|
459
|
"&action=readdata&docid="+accNumber;
|
460
|
readDataURLString = MetaCatUtil.replaceWhiteSpaceForURL(readDataURLString);
|
461
|
URL u = new URL(readDataURLString);
|
462
|
InputStream input = u.openStream();
|
463
|
//register data file into xml_documents table and wite data file
|
464
|
//into file system
|
465
|
if ( input != null)
|
466
|
{
|
467
|
DocumentImpl.writeDataFileInReplication(input,
|
468
|
datafilePath,
|
469
|
docName,docType,
|
470
|
accNumber, user,
|
471
|
docHomeServer,
|
472
|
remoteserver,
|
473
|
tableName,
|
474
|
true, //true means timed replication
|
475
|
createdDate,
|
476
|
updatedDate);
|
477
|
|
478
|
logMetacat.info("Successfully to write datafile " + accNumber);
|
479
|
/*MetacatReplication.replLog("wrote datafile " + accNumber + " from " +
|
480
|
remoteserver);*/
|
481
|
if (tableName.equals(DocumentImpl.DOCUMENTTABLE))
|
482
|
{
|
483
|
MetacatReplication.replLog("" +DOCINSERTNUMBER + " Wrote data file" + accNumber +
|
484
|
" into "+tableName + " from " +
|
485
|
remoteserver);
|
486
|
DOCINSERTNUMBER++;
|
487
|
}
|
488
|
else
|
489
|
{
|
490
|
MetacatReplication.replLog("" +REVINSERTNUMBER + " Wrote data file" + accNumber +
|
491
|
" into "+tableName + " from " +
|
492
|
remoteserver);
|
493
|
REVINSERTNUMBER++;
|
494
|
}
|
495
|
String ip = getIpFromURL(u);
|
496
|
EventLog.getInstance().log(ip, MetacatReplication.REPLICATIONUSER, accNumber, actions);
|
497
|
|
498
|
}//if
|
499
|
else
|
500
|
{
|
501
|
logMetacat.info("Couldn't open the data file: " + accNumber);
|
502
|
throw new Exception("Couldn't open the data file: " + accNumber);
|
503
|
}//else
|
504
|
|
505
|
}//try
|
506
|
catch(Exception e)
|
507
|
{
|
508
|
/*MetacatReplication.replErrorLog("Failed to try wrote datafile " + accNumber +
|
509
|
" because " +e.getMessage());*/
|
510
|
if (tableName.equals(DocumentImpl.DOCUMENTTABLE))
|
511
|
{
|
512
|
MetacatReplication.replErrorLog("" +DOCERRORNUMBER + " Failed to write data file " + accNumber +
|
513
|
" into "+tableName + " from " +
|
514
|
remoteserver + " because "+e.getMessage());
|
515
|
DOCERRORNUMBER++;
|
516
|
}
|
517
|
else
|
518
|
{
|
519
|
MetacatReplication.replErrorLog("" +REVERRORNUMBER + " Failed to write data file" + accNumber +
|
520
|
" into "+tableName + " from " +
|
521
|
remoteserver +" because "+e.getMessage());
|
522
|
REVERRORNUMBER++;
|
523
|
}
|
524
|
logMetacat.error("Failed to try wrote datafile " + accNumber +
|
525
|
" because " +e.getMessage());
|
526
|
throw e;
|
527
|
}
|
528
|
finally
|
529
|
{
|
530
|
//return DBConnection
|
531
|
DBConnectionPool.returnDBConnection(dbConn, serialNumber);
|
532
|
}//finally
|
533
|
}
|
534
|
|
535
|
|
536
|
|
537
|
/* Handle delete single document*/
|
538
|
private void handleDeleteSingleDocument(String docId, String notifyServer)
|
539
|
throws Exception
|
540
|
{
|
541
|
logMetacat.info("Try delete doc: "+docId);
|
542
|
DBConnection dbConn = null;
|
543
|
int serialNumber = -1;
|
544
|
try
|
545
|
{
|
546
|
// Get DBConnection from pool
|
547
|
dbConn=DBConnectionPool.
|
548
|
getDBConnection("ReplicationHandler.handleDeleteSingleDoc");
|
549
|
serialNumber=dbConn.getCheckOutSerialNumber();
|
550
|
if(!alreadyDeleted(docId))
|
551
|
{
|
552
|
|
553
|
//because delete method docid should have rev number
|
554
|
//so we just add one for it. This rev number is no sence.
|
555
|
String accnum=docId+util.getOption("accNumSeparator")+"1";
|
556
|
//System.out.println("accnum: "+accnum);
|
557
|
DocumentImpl.delete(accnum, null, null, notifyServer);
|
558
|
logMetacat.info("Successfully deleted doc " + docId);
|
559
|
MetacatReplication.replLog("Doc " + docId + " deleted");
|
560
|
URL u = new URL("https://"+notifyServer);
|
561
|
String ip = getIpFromURL(u);
|
562
|
EventLog.getInstance().log(ip, MetacatReplication.REPLICATIONUSER, docId, "delete");
|
563
|
}
|
564
|
|
565
|
}//try
|
566
|
catch(Exception e)
|
567
|
{
|
568
|
MetacatReplication.replErrorLog("Failed to delete doc " + docId +
|
569
|
" in db because " +e.getMessage());
|
570
|
logMetacat.error("Failed to delete doc " + docId +
|
571
|
" in db because because " + e.getMessage());
|
572
|
throw e;
|
573
|
}
|
574
|
finally
|
575
|
{
|
576
|
//return DBConnection
|
577
|
DBConnectionPool.returnDBConnection(dbConn, serialNumber);
|
578
|
}//finally
|
579
|
}
|
580
|
|
581
|
/* Handle updateLastCheckTimForSingleServer*/
|
582
|
private void updateLastCheckTimeForSingleServer(ReplicationServer repServer)
|
583
|
throws Exception
|
584
|
{
|
585
|
String server = repServer.getServerName();
|
586
|
DBConnection dbConn = null;
|
587
|
int serialNumber = -1;
|
588
|
PreparedStatement pstmt = null;
|
589
|
try
|
590
|
{
|
591
|
// Get DBConnection from pool
|
592
|
dbConn=DBConnectionPool.
|
593
|
getDBConnection("ReplicationHandler.updateLastCheckTimeForServer");
|
594
|
serialNumber=dbConn.getCheckOutSerialNumber();
|
595
|
|
596
|
logMetacat.info("Try to update last_check for server: "+server);
|
597
|
// Get time from remote server
|
598
|
URL dateurl = new URL("https://" + server + "?server="+
|
599
|
util.getLocalReplicationServerName()+"&action=gettime");
|
600
|
String datexml = MetacatReplication.getURLContent(dateurl);
|
601
|
logMetacat.info("datexml: "+datexml);
|
602
|
if (datexml!=null && !datexml.equals(""))
|
603
|
{
|
604
|
String datestr = datexml.substring(11, datexml.indexOf('<', 11));
|
605
|
StringBuffer sql = new StringBuffer();
|
606
|
/*sql.append("update xml_replication set last_checked = to_date('");
|
607
|
sql.append(datestr).append("', 'YY-MM-DD HH24:MI:SS') where ");
|
608
|
sql.append("server like '").append(server).append("'");*/
|
609
|
sql.append("update xml_replication set last_checked = ");
|
610
|
sql.append(dbAdapter.toDate(datestr, "MM/DD/YY HH24:MI:SS"));
|
611
|
sql.append(" where server like '").append(server).append("'");
|
612
|
pstmt = dbConn.prepareStatement(sql.toString());
|
613
|
|
614
|
pstmt.executeUpdate();
|
615
|
dbConn.commit();
|
616
|
pstmt.close();
|
617
|
logMetacat.info("last_checked updated to "+datestr+" on "
|
618
|
+ server);
|
619
|
}//if
|
620
|
else
|
621
|
{
|
622
|
|
623
|
logMetacat.info("Failed to update last_checked for server " +
|
624
|
server + " in db because couldn't get time "
|
625
|
);
|
626
|
throw new Exception("Couldn't get time for server "+ server);
|
627
|
}
|
628
|
|
629
|
}//try
|
630
|
catch(Exception e)
|
631
|
{
|
632
|
|
633
|
logMetacat.error("Failed to update last_checked for server " +
|
634
|
server + " in db because because " +
|
635
|
e.getMessage());
|
636
|
throw e;
|
637
|
}
|
638
|
finally
|
639
|
{
|
640
|
//return DBConnection
|
641
|
DBConnectionPool.returnDBConnection(dbConn, serialNumber);
|
642
|
}//finally
|
643
|
}
|
644
|
|
645
|
|
646
|
|
647
|
/**
|
648
|
* updates xml_catalog with entries from other servers.
|
649
|
*/
|
650
|
private void updateCatalog()
|
651
|
{
|
652
|
logMetacat.info("Start of updateCatalog");
|
653
|
// ReplicationServer object in server list
|
654
|
ReplicationServer replServer = null;
|
655
|
PreparedStatement pstmt = null;
|
656
|
String server = null;
|
657
|
|
658
|
|
659
|
// Go through each ReplicationServer object in sererlist
|
660
|
for (int j=0; j<serverList.size(); j++)
|
661
|
{
|
662
|
Vector remoteCatalog = new Vector();
|
663
|
Vector publicId = new Vector();
|
664
|
try
|
665
|
{
|
666
|
// Get ReplicationServer object from server list
|
667
|
replServer = serverList.serverAt(j);
|
668
|
// Get server name from the ReplicationServer object
|
669
|
server = replServer.getServerName();
|
670
|
// Try to get catalog
|
671
|
URL u = new URL("https://" + server + "?server="+
|
672
|
util.getLocalReplicationServerName()+"&action=getcatalog");
|
673
|
logMetacat.info("sending message " + u.toString());
|
674
|
String catxml = MetacatReplication.getURLContent(u);
|
675
|
|
676
|
// Make sure there are not error, no empty string
|
677
|
if (catxml.indexOf("error")!=-1 || catxml==null||catxml.equals(""))
|
678
|
{
|
679
|
throw new Exception("Couldn't get catalog list form server " +server);
|
680
|
}
|
681
|
logMetacat.info("catxml: " + catxml);
|
682
|
CatalogMessageHandler cmh = new CatalogMessageHandler();
|
683
|
XMLReader catparser = initParser(cmh);
|
684
|
catparser.parse(new InputSource(new StringReader(catxml)));
|
685
|
//parse the returned catalog xml and put it into a vector
|
686
|
remoteCatalog = cmh.getCatalogVect();
|
687
|
|
688
|
// Makse sure remoteCatalog is not empty
|
689
|
if (remoteCatalog.isEmpty())
|
690
|
{
|
691
|
throw new Exception("Couldn't get catalog list form server " +server);
|
692
|
}
|
693
|
|
694
|
String localcatxml = MetacatReplication.getCatalogXML();
|
695
|
|
696
|
// Make sure local catalog is no empty
|
697
|
if (localcatxml==null||localcatxml.equals(""))
|
698
|
{
|
699
|
throw new Exception("Couldn't get catalog list form server " +server);
|
700
|
}
|
701
|
|
702
|
cmh = new CatalogMessageHandler();
|
703
|
catparser = initParser(cmh);
|
704
|
catparser.parse(new InputSource(new StringReader(localcatxml)));
|
705
|
Vector localCatalog = cmh.getCatalogVect();
|
706
|
|
707
|
//now we have the catalog from the remote server and this local server
|
708
|
//we now need to compare the two and merge the differences.
|
709
|
//the comparison is base on the public_id fields which is the 4th
|
710
|
//entry in each row vector.
|
711
|
publicId = new Vector();
|
712
|
for(int i=0; i<localCatalog.size(); i++)
|
713
|
{
|
714
|
Vector v = new Vector((Vector)localCatalog.elementAt(i));
|
715
|
logMetacat.info("v1: " + v.toString());
|
716
|
publicId.add(new String((String)v.elementAt(3)));
|
717
|
//System.out.println("adding " + (String)v.elementAt(3));
|
718
|
}
|
719
|
}//try
|
720
|
catch (Exception e)
|
721
|
{
|
722
|
MetacatReplication.replErrorLog("Failed to update catalog for server "+
|
723
|
server + " because " +e.getMessage());
|
724
|
logMetacat.error("Failed to update catalog for server "+
|
725
|
server + " because " +e.getMessage());
|
726
|
}//catch
|
727
|
|
728
|
for(int i=0; i<remoteCatalog.size(); i++)
|
729
|
{
|
730
|
// DConnection
|
731
|
DBConnection dbConn = null;
|
732
|
// DBConnection checkout serial number
|
733
|
int serialNumber = -1;
|
734
|
try
|
735
|
{
|
736
|
dbConn=DBConnectionPool.
|
737
|
getDBConnection("ReplicationHandler.updateCatalog");
|
738
|
serialNumber=dbConn.getCheckOutSerialNumber();
|
739
|
Vector v = (Vector)remoteCatalog.elementAt(i);
|
740
|
//System.out.println("v2: " + v.toString());
|
741
|
//System.out.println("i: " + i);
|
742
|
//System.out.println("remoteCatalog.size(): " + remoteCatalog.size());
|
743
|
//System.out.println("publicID: " + publicId.toString());
|
744
|
logMetacat.info
|
745
|
("v.elementAt(3): " + (String)v.elementAt(3));
|
746
|
if(!publicId.contains(v.elementAt(3)))
|
747
|
{ //so we don't have this public id in our local table so we need to
|
748
|
//add it.
|
749
|
//System.out.println("in if");
|
750
|
StringBuffer sql = new StringBuffer();
|
751
|
sql.append("insert into xml_catalog (entry_type, source_doctype, ");
|
752
|
sql.append("target_doctype, public_id, system_id) values (?,?,?,");
|
753
|
sql.append("?,?)");
|
754
|
//System.out.println("sql: " + sql.toString());
|
755
|
pstmt = dbConn.prepareStatement(sql.toString());
|
756
|
pstmt.setString(1, (String)v.elementAt(0));
|
757
|
pstmt.setString(2, (String)v.elementAt(1));
|
758
|
pstmt.setString(3, (String)v.elementAt(2));
|
759
|
pstmt.setString(4, (String)v.elementAt(3));
|
760
|
pstmt.setString(5, (String)v.elementAt(4));
|
761
|
pstmt.execute();
|
762
|
pstmt.close();
|
763
|
MetacatReplication.replLog("Success fully to insert new publicid "+
|
764
|
(String)v.elementAt(3) + " from server"+server);
|
765
|
logMetacat.info("Success fully to insert new publicid "+
|
766
|
(String)v.elementAt(3) + " from server" +server);
|
767
|
}
|
768
|
}
|
769
|
catch(Exception e)
|
770
|
{
|
771
|
MetacatReplication.replErrorLog("Failed to update catalog for server "+
|
772
|
server + " because " +e.getMessage());
|
773
|
logMetacat.error("Failed to update catalog for server "+
|
774
|
server + " because " +e.getMessage());
|
775
|
}//catch
|
776
|
finally
|
777
|
{
|
778
|
DBConnectionPool.returnDBConnection(dbConn, serialNumber);
|
779
|
}//finall
|
780
|
}//for remote catalog
|
781
|
}//for server list
|
782
|
logMetacat.info("End of updateCatalog");
|
783
|
}
|
784
|
|
785
|
/**
|
786
|
* Method that returns true if docid has already been "deleted" from metacat.
|
787
|
* This method really implements a truth table for deleted documents
|
788
|
* The table is (a docid in one of the tables is represented by the X):
|
789
|
* xml_docs xml_revs deleted?
|
790
|
* ------------------------------------
|
791
|
* X X FALSE
|
792
|
* X _ FALSE
|
793
|
* _ X TRUE
|
794
|
* _ _ TRUE
|
795
|
*/
|
796
|
private static boolean alreadyDeleted(String docid) throws Exception
|
797
|
{
|
798
|
DBConnection dbConn = null;
|
799
|
int serialNumber = -1;
|
800
|
PreparedStatement pstmt = null;
|
801
|
try
|
802
|
{
|
803
|
dbConn=DBConnectionPool.
|
804
|
getDBConnection("ReplicationHandler.alreadyDeleted");
|
805
|
serialNumber=dbConn.getCheckOutSerialNumber();
|
806
|
boolean xml_docs = false;
|
807
|
boolean xml_revs = false;
|
808
|
|
809
|
StringBuffer sb = new StringBuffer();
|
810
|
sb.append("select docid from xml_revisions where docid like '");
|
811
|
sb.append(docid).append("'");
|
812
|
pstmt = dbConn.prepareStatement(sb.toString());
|
813
|
pstmt.execute();
|
814
|
ResultSet rs = pstmt.getResultSet();
|
815
|
boolean tablehasrows = rs.next();
|
816
|
if(tablehasrows)
|
817
|
{
|
818
|
xml_revs = true;
|
819
|
}
|
820
|
|
821
|
sb = new StringBuffer();
|
822
|
sb.append("select docid from xml_documents where docid like '");
|
823
|
sb.append(docid).append("'");
|
824
|
pstmt.close();
|
825
|
pstmt = dbConn.prepareStatement(sb.toString());
|
826
|
//increase usage count
|
827
|
dbConn.increaseUsageCount(1);
|
828
|
pstmt.execute();
|
829
|
rs = pstmt.getResultSet();
|
830
|
tablehasrows = rs.next();
|
831
|
pstmt.close();
|
832
|
if(tablehasrows)
|
833
|
{
|
834
|
xml_docs = true;
|
835
|
}
|
836
|
|
837
|
if(xml_docs && xml_revs)
|
838
|
{
|
839
|
return false;
|
840
|
}
|
841
|
else if(xml_docs && !xml_revs)
|
842
|
{
|
843
|
return false;
|
844
|
}
|
845
|
else if(!xml_docs && xml_revs)
|
846
|
{
|
847
|
return true;
|
848
|
}
|
849
|
else if(!xml_docs && !xml_revs)
|
850
|
{
|
851
|
return true;
|
852
|
}
|
853
|
}
|
854
|
catch(Exception e)
|
855
|
{
|
856
|
logMetacat.error("error in ReplicationHandler.alreadyDeleted: " +
|
857
|
e.getMessage());
|
858
|
throw e;
|
859
|
}
|
860
|
finally
|
861
|
{
|
862
|
try
|
863
|
{
|
864
|
pstmt.close();
|
865
|
}//try
|
866
|
catch (SQLException ee)
|
867
|
{
|
868
|
logMetacat.error("Error in replicationHandler.alreadyDeleted "+
|
869
|
"to close pstmt: "+ee.getMessage());
|
870
|
throw ee;
|
871
|
}//catch
|
872
|
finally
|
873
|
{
|
874
|
DBConnectionPool.returnDBConnection(dbConn, serialNumber);
|
875
|
}//finally
|
876
|
}//finally
|
877
|
return false;
|
878
|
}
|
879
|
|
880
|
|
881
|
/**
|
882
|
* Method to initialize the message parser
|
883
|
*/
|
884
|
public static XMLReader initParser(DefaultHandler dh)
|
885
|
throws Exception
|
886
|
{
|
887
|
XMLReader parser = null;
|
888
|
|
889
|
try {
|
890
|
ContentHandler chandler = dh;
|
891
|
|
892
|
// Get an instance of the parser
|
893
|
MetaCatUtil util = new MetaCatUtil();
|
894
|
String parserName = util.getOption("saxparser");
|
895
|
parser = XMLReaderFactory.createXMLReader(parserName);
|
896
|
|
897
|
// Turn off validation
|
898
|
parser.setFeature("http://xml.org/sax/features/validation", false);
|
899
|
|
900
|
parser.setContentHandler((ContentHandler)chandler);
|
901
|
parser.setErrorHandler((ErrorHandler)chandler);
|
902
|
|
903
|
} catch (Exception e) {
|
904
|
throw e;
|
905
|
}
|
906
|
|
907
|
return parser;
|
908
|
}
|
909
|
|
910
|
/**
|
911
|
* This method will combinate given time string(in short format) to
|
912
|
* current date. If the given time (e.g 10:00 AM) passed the current time
|
913
|
* (e.g 2:00 PM Aug 21, 2005), then the time will set to second day,
|
914
|
* 10:00 AM Aug 22, 2005. If the given time (e.g 10:00 AM) haven't passed
|
915
|
* the current time (e.g 8:00 AM Aug 21, 2005) The time will set to be
|
916
|
* 10:00 AM Aug 21, 2005.
|
917
|
* @param givenTime the format should be "10:00 AM " or "2:00 PM"
|
918
|
* @return
|
919
|
* @throws Exception
|
920
|
*/
|
921
|
public static Date combinateCurrentDateAndGivenTime(String givenTime) throws Exception
|
922
|
{
|
923
|
Date givenDate = parseTime(givenTime);
|
924
|
Date newDate = null;
|
925
|
Date now = new Date();
|
926
|
String currentTimeString = getTimeString(now);
|
927
|
Date currentTime = parseTime(currentTimeString);
|
928
|
if ( currentTime.getTime() >= givenDate.getTime())
|
929
|
{
|
930
|
logMetacat.info("Today already pass the given time, we should set it as tomorrow");
|
931
|
String dateAndTime = getDateString(now) + " " + givenTime;
|
932
|
Date combinationDate = parseDateTime(dateAndTime);
|
933
|
// new date should plus 24 hours to make is the second day
|
934
|
newDate = new Date(combinationDate.getTime()+24*3600*1000);
|
935
|
}
|
936
|
else
|
937
|
{
|
938
|
logMetacat.info("Today haven't pass the given time, we should it as today");
|
939
|
String dateAndTime = getDateString(now) + " " + givenTime;
|
940
|
newDate = parseDateTime(dateAndTime);
|
941
|
}
|
942
|
logMetacat.warn("final setting time is "+ newDate.toString());
|
943
|
return newDate;
|
944
|
}
|
945
|
|
946
|
/*
|
947
|
* parse a given string to Time in short format.
|
948
|
* For example, given time is 10:00 AM, the date will be return as
|
949
|
* Jan 1 1970, 10:00 AM
|
950
|
*/
|
951
|
private static Date parseTime(String timeString) throws Exception
|
952
|
{
|
953
|
DateFormat format = DateFormat.getTimeInstance(DateFormat.SHORT);
|
954
|
Date time = format.parse(timeString);
|
955
|
logMetacat.info("Date string is after parse a time string "
|
956
|
+time.toString());
|
957
|
return time;
|
958
|
|
959
|
}
|
960
|
|
961
|
/*
|
962
|
* Pasre a given string to date and time. Date format is long and time
|
963
|
* format is short.
|
964
|
*/
|
965
|
private static Date parseDateTime(String timeString) throws Exception
|
966
|
{
|
967
|
DateFormat format = DateFormat.getDateTimeInstance(DateFormat.LONG, DateFormat.SHORT);
|
968
|
Date time = format.parse(timeString);
|
969
|
logMetacat.info("Date string is after parse a time string "+
|
970
|
time.toString());
|
971
|
return time;
|
972
|
}
|
973
|
|
974
|
/*
|
975
|
* Get a date string from a Date object. The date format will be long
|
976
|
*/
|
977
|
private static String getDateString(Date now)
|
978
|
{
|
979
|
DateFormat df = DateFormat.getDateInstance(DateFormat.LONG);
|
980
|
String s = df.format(now);
|
981
|
logMetacat.info("Today is " + s);
|
982
|
return s;
|
983
|
}
|
984
|
|
985
|
/*
|
986
|
* Get a time string from a Date object, the time format will be short
|
987
|
*/
|
988
|
private static String getTimeString(Date now)
|
989
|
{
|
990
|
DateFormat df = DateFormat.getTimeInstance(DateFormat.SHORT);
|
991
|
String s = df.format(now);
|
992
|
logMetacat.info("Time is " + s);
|
993
|
return s;
|
994
|
}
|
995
|
|
996
|
|
997
|
/*
|
998
|
* This method will go through the docid list both in xml_Documents table
|
999
|
* and in xml_revisions table
|
1000
|
* @author tao
|
1001
|
*/
|
1002
|
private void handleDocList(Vector docList, String tableName)
|
1003
|
{
|
1004
|
boolean dataFile=false;
|
1005
|
for(int j=0; j<docList.size(); j++)
|
1006
|
{
|
1007
|
//initial dataFile is false
|
1008
|
dataFile=false;
|
1009
|
//w is information for one document, information contain
|
1010
|
//docid, rev, server or datafile.
|
1011
|
Vector w = new Vector((Vector)(docList.elementAt(j)));
|
1012
|
//Check if the vector w contain "datafile"
|
1013
|
//If it has, this document is data file
|
1014
|
if (w.contains((String)util.getOption("datafileflag")))
|
1015
|
{
|
1016
|
dataFile=true;
|
1017
|
}
|
1018
|
//System.out.println("w: " + w.toString());
|
1019
|
// Get docid
|
1020
|
String docid = (String)w.elementAt(0);
|
1021
|
logMetacat.info("docid: " + docid);
|
1022
|
// Get revision number
|
1023
|
int rev = Integer.parseInt((String)w.elementAt(1));
|
1024
|
logMetacat.info("rev: " + rev);
|
1025
|
// Get remote server name (it is may not be doc homeserver because
|
1026
|
// the new hub feature
|
1027
|
String remoteServer = (String)w.elementAt(2);
|
1028
|
remoteServer = remoteServer.trim();
|
1029
|
|
1030
|
try
|
1031
|
{
|
1032
|
if (tableName.equals(DocumentImpl.DOCUMENTTABLE))
|
1033
|
{
|
1034
|
handleDocInXMLDocuments(docid, rev, remoteServer, dataFile);
|
1035
|
}
|
1036
|
else if (tableName.equals(DocumentImpl.REVISIONTABLE))
|
1037
|
{
|
1038
|
handleDocInXMLRevisions(docid, rev, remoteServer, dataFile);
|
1039
|
}
|
1040
|
else
|
1041
|
{
|
1042
|
continue;
|
1043
|
}
|
1044
|
|
1045
|
}
|
1046
|
catch (Exception e)
|
1047
|
{
|
1048
|
logMetacat.error("error to handle update doc in "+
|
1049
|
tableName +" in time replication"+e.getMessage());
|
1050
|
continue;
|
1051
|
}
|
1052
|
|
1053
|
}//for update docs
|
1054
|
|
1055
|
}
|
1056
|
|
1057
|
/*
|
1058
|
* This method will handle doc in xml_documents table.
|
1059
|
*/
|
1060
|
private void handleDocInXMLDocuments(String docid, int rev, String remoteServer, boolean dataFile)
|
1061
|
throws Exception
|
1062
|
{
|
1063
|
// compare the update rev and local rev to see what need happen
|
1064
|
int localrev = -1;
|
1065
|
String action = null;
|
1066
|
boolean flag = false;
|
1067
|
try
|
1068
|
{
|
1069
|
localrev = DBUtil.getLatestRevisionInDocumentTable(docid);
|
1070
|
}
|
1071
|
catch (SQLException e)
|
1072
|
{
|
1073
|
logMetacat.error("Local rev for docid "+ docid + " could not "+
|
1074
|
" be found because " + e.getMessage());
|
1075
|
MetacatReplication.replErrorLog(""+DOCERRORNUMBER+"Docid "+ docid + " could not be "+
|
1076
|
"written because error happend to find it's local revision");
|
1077
|
DOCERRORNUMBER++;
|
1078
|
throw new Exception (e.getMessage());
|
1079
|
}
|
1080
|
logMetacat.info("Local rev for docid "+ docid + " is "+
|
1081
|
localrev);
|
1082
|
|
1083
|
//check the revs for an update because this document is in the
|
1084
|
//local DB, it might be out of date.
|
1085
|
if (localrev == -1)
|
1086
|
{
|
1087
|
// check if the revision is in the revision table
|
1088
|
Vector localRevVector = DBUtil.getRevListFromRevisionTable(docid);
|
1089
|
if (localRevVector != null && localRevVector.contains(new Integer(rev)))
|
1090
|
{
|
1091
|
// this version was deleted, so don't need replicate
|
1092
|
flag = false;
|
1093
|
}
|
1094
|
else
|
1095
|
{
|
1096
|
//insert this document as new because it is not in the local DB
|
1097
|
action = "INSERT";
|
1098
|
flag = true;
|
1099
|
}
|
1100
|
}
|
1101
|
else
|
1102
|
{
|
1103
|
if(localrev == rev)
|
1104
|
{
|
1105
|
// Local meatacat has the same rev to remote host, don't need
|
1106
|
// update and flag set false
|
1107
|
flag = false;
|
1108
|
}
|
1109
|
else if(localrev < rev)
|
1110
|
{
|
1111
|
//this document needs to be updated so send an read request
|
1112
|
action = "UPDATE";
|
1113
|
flag = true;
|
1114
|
}
|
1115
|
}
|
1116
|
|
1117
|
String accNumber = docid + MetaCatUtil.getOption("accNumSeparator") + rev;
|
1118
|
// this is non-data file
|
1119
|
if(flag && !dataFile)
|
1120
|
{
|
1121
|
try
|
1122
|
{
|
1123
|
handleSingleXMLDocument(remoteServer, action, accNumber, DocumentImpl.DOCUMENTTABLE);
|
1124
|
}
|
1125
|
catch(Exception e)
|
1126
|
{
|
1127
|
// skip this document
|
1128
|
throw e;
|
1129
|
}
|
1130
|
}//if for non-data file
|
1131
|
|
1132
|
// this is for data file
|
1133
|
if(flag && dataFile)
|
1134
|
{
|
1135
|
try
|
1136
|
{
|
1137
|
handleSingleDataFile(remoteServer, action, accNumber, DocumentImpl.DOCUMENTTABLE);
|
1138
|
}
|
1139
|
catch(Exception e)
|
1140
|
{
|
1141
|
// skip this datafile
|
1142
|
throw e;
|
1143
|
}
|
1144
|
|
1145
|
}//for datafile
|
1146
|
}
|
1147
|
|
1148
|
/*
|
1149
|
* This method will handle doc in xml_documents table.
|
1150
|
*/
|
1151
|
private void handleDocInXMLRevisions(String docid, int rev, String remoteServer, boolean dataFile)
|
1152
|
throws Exception
|
1153
|
{
|
1154
|
// compare the update rev and local rev to see what need happen
|
1155
|
logMetacat.info("In handle repliation revsion table");
|
1156
|
logMetacat.info("the docid is "+ docid);
|
1157
|
logMetacat.info("The rev is "+rev);
|
1158
|
Vector localrev = null;
|
1159
|
String action = "INSERT";
|
1160
|
boolean flag = false;
|
1161
|
try
|
1162
|
{
|
1163
|
localrev = DBUtil.getRevListFromRevisionTable(docid);
|
1164
|
}
|
1165
|
catch (SQLException e)
|
1166
|
{
|
1167
|
logMetacat.error("Local rev for docid "+ docid + " could not "+
|
1168
|
" be found because " + e.getMessage());
|
1169
|
MetacatReplication.replErrorLog(""+REVERRORNUMBER+" Docid "+ docid + " could not be "+
|
1170
|
"written because error happend to find it's local revision");
|
1171
|
REVERRORNUMBER++;
|
1172
|
throw new Exception (e.getMessage());
|
1173
|
}
|
1174
|
logMetacat.info("rev list in xml_revision table for docid "+ docid + " is "+
|
1175
|
localrev.toString());
|
1176
|
|
1177
|
// if the rev is not in the xml_revision, we need insert it
|
1178
|
if (!localrev.contains(new Integer(rev)))
|
1179
|
{
|
1180
|
flag = true;
|
1181
|
}
|
1182
|
|
1183
|
String accNumber = docid + MetaCatUtil.getOption("accNumSeparator") + rev;
|
1184
|
// this is non-data file
|
1185
|
if(flag && !dataFile)
|
1186
|
{
|
1187
|
try
|
1188
|
{
|
1189
|
|
1190
|
handleSingleXMLDocument(remoteServer, action, accNumber, DocumentImpl.REVISIONTABLE);
|
1191
|
}
|
1192
|
catch(Exception e)
|
1193
|
{
|
1194
|
// skip this document
|
1195
|
throw e;
|
1196
|
}
|
1197
|
}//if for non-data file
|
1198
|
|
1199
|
// this is for data file
|
1200
|
if(flag && dataFile)
|
1201
|
{
|
1202
|
try
|
1203
|
{
|
1204
|
handleSingleDataFile(remoteServer, action, accNumber, DocumentImpl.REVISIONTABLE);
|
1205
|
}
|
1206
|
catch(Exception e)
|
1207
|
{
|
1208
|
// skip this datafile
|
1209
|
throw e;
|
1210
|
}
|
1211
|
|
1212
|
}//for datafile
|
1213
|
}
|
1214
|
|
1215
|
/*
|
1216
|
* Return a ip address for given url
|
1217
|
*/
|
1218
|
private String getIpFromURL(URL url)
|
1219
|
{
|
1220
|
String ip = null;
|
1221
|
try
|
1222
|
{
|
1223
|
InetAddress address = InetAddress.getByName(url.getHost());
|
1224
|
ip = address.getHostAddress();
|
1225
|
}
|
1226
|
catch(UnknownHostException e)
|
1227
|
{
|
1228
|
logMetacat.error("Error in get ip address for host: "
|
1229
|
+e.getMessage());
|
1230
|
}
|
1231
|
|
1232
|
return ip;
|
1233
|
}
|
1234
|
|
1235
|
}
|
1236
|
|