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/**
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* '$RCSfile$'
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* Purpose: A class represent a replication server list in
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xml_replcation table
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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: Jing Tao
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*
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* '$Author$'
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* '$Date$'
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* '$Revision$'
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package edu.ucsb.nceas.metacat.replication;
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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import java.sql.Timestamp;
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import java.util.Calendar;
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import java.util.Date;
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import java.util.Vector;
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import org.apache.log4j.Logger;
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import edu.ucsb.nceas.metacat.database.DBConnection;
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import edu.ucsb.nceas.metacat.database.DBConnectionPool;
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import edu.ucsb.nceas.metacat.database.DatabaseService;
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/**
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* A class represent a replication server list in xml_replcation table
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*/
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public class ReplicationServerList
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{
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private static Vector<ReplicationServer> serverList = null; //Vector to store server list
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private static Logger logMetacat = Logger.getLogger(ReplicationServerList.class);
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sgarg
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/**
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* constructor of ReplicationServerList
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* It will build server list. If only local host exists, ther server list
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* will be null
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*/
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public ReplicationServerList()
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{
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serverList = new Vector<ReplicationServer>();
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//Build serverList
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buildServerList();
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}//ReplicationServerList
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/**
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* Method to create server list from xml_replication table
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* If in xml_replication table, only local host exists, server list will be
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* empty
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*/
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private void buildServerList()
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{
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ReplicationServer server = null; //element in server list
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DBConnection dbConn = null;//DBConnection
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int serialNumber = -1;//DBConnection serial number
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PreparedStatement pstmt = null;
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ResultSet rs = null;
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boolean hasReplication = false;//Replication xml or not
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boolean hasDataReplication = false;//Replication data file or not
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boolean hasSystemMetadataReplication = false;//Replication for system metadata or not
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boolean isHub = false;//local host is the hub for this server or not
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try
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{
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//Get DBConnection
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dbConn=DBConnectionPool.
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getDBConnection("ReplicationHandler.buildServerList");
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serialNumber=dbConn.getCheckOutSerialNumber();
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//Select fields from xml_replication table
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pstmt = dbConn.prepareStatement("select server, last_checked, replicate,"+
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" datareplicate, systemmetadatareplicate, hub from xml_replication");
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//Execute prepare statement
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pstmt.execute();
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//Get result set
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rs = pstmt.getResultSet();
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//Iterate over the result set
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boolean tableHasRows = rs.next();
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while(tableHasRows)
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{
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//Server name
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String serverName = rs.getString(1);
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logMetacat.info("ServerName: "+serverName);
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//Last check date
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Date lastChecked = rs.getDate(2);
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logMetacat.info("Last checked time: "+lastChecked);
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//Replication value
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int replication = rs.getInt(3);
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logMetacat.info("Replication value: "+replication);
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//Data replication value
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int dataReplication = rs.getInt(4);
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logMetacat.info("DataReplication value: "+dataReplication);
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//Data replication value
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int systemMetadataReplication = rs.getInt(5);
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logMetacat.info("DataReplication value: "+dataReplication);
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//Hub value
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int hubValue = rs.getInt(6);
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logMetacat.info("Hub value: "+hubValue);
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//Get rid of local host
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if(!serverName.equals("localhost"))
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{
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//create a new object of Replication
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server = new ReplicationServer();
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//Set server name
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server.setServerName(serverName);
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//Set last check date
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server.setLastCheckedDate(lastChecked);
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//From replication value to determine hasReplication valuse
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if (replication ==1)
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{
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//If replication equals 1, it can replicate xml documents
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hasReplication = true;
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}//if
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else
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{
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//if replication is NOT 1, it can't replicate xml documents
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hasReplication = false;
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}//else
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//Set replication value
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server.setReplication(hasReplication);
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//From both replication and data replication value to determine
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//hasDataReplication value
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if (hasReplication && dataReplication ==1)
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{
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//Only server can replicate xml (hasRplication == true) and
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// dataReplication is 1, local host can replicate data file
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hasDataReplication = true;
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}//if
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else
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{
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hasDataReplication = false;
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}//else
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//Set data replciation value
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server.setDataReplication(hasDataReplication);
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leinfelder
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if (systemMetadataReplication == 1) {
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hasSystemMetadataReplication = true;
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}
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server.setSystemMetadataReplication(hasSystemMetadataReplication);
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//Detemine isHub by hubValue
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if (hubValue ==1)
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{
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isHub = true;
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}//if
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else
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{
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isHub = false;
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}//else
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//Set hub value
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server.setHub(isHub);
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//Add this server into server list
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serverList.add(server);
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}//if
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//Go to new row
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tableHasRows = rs.next();
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}//while
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}//try
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catch(Exception e)
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{
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logMetacat.error("Error in ReplicationServerList."
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+"buildServerList(): "+e.getMessage());
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}//catch
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finally
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{
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try
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{
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//close result set
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rs.close();
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//close prepareed statement
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pstmt.close();
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}//try
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catch (SQLException sqlE)
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{
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logMetacat.error("Error in ReplicationHandler.buildServerList: "
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+sqlE.getMessage());
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}//catch
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finally
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{
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//Return dbconnection too pool
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DBConnectionPool.returnDBConnection(dbConn, serialNumber);
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}//finally
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}//finally
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}//buildServerList
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/**
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* Method to determine the server list is empty or not
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*/
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public boolean isEmpty()
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{
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return serverList.isEmpty();
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}//isEmpty
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/**
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* Method to get the size of serverList
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*/
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public int size()
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{
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return serverList.size();
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}//size()
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/**
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* Method to add a new replciation server object to serverList
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* @Param newReplciationServer, the object need to be add
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*/
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private synchronized void addNewReplicationServer
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(ReplicationServer newReplicationServer)
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{
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serverList.add(newReplicationServer);
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}//addNewReplicationServer
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/**
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* Method to get a server object given a index number
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* @param index, the given index number
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*/
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public ReplicationServer serverAt(int index)
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{
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return (ReplicationServer)serverList.elementAt(index);
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}//serverAt
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/**
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* Method to determine if a given server in the replication server list
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* @param givenServerName, a server name will be check.
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*/
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public boolean isGivenServerInList(String givenServerName)
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{
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boolean result = false;//Variable store the return value
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ReplicationServer server = null; //Element in vetor
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int size = 0;//Variable to store the size of vector serverList
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//Get the size of vector
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size = serverList.size();
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//If server list is empty
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if (size == 0||givenServerName == null||givenServerName.equals(""))
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{
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result = false;
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return result;
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}
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//Check every element in the vector
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for (int i = 0; i < size; i++)
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{
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//Get the ReplicationServer object indexed i in vector
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server = (ReplicationServer) serverList.elementAt(i);
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//If given name match a server's name, return true
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if ( givenServerName.equalsIgnoreCase(server.getServerName()))
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{
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result = true;
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return result;
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}//if
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}//for
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//If reach here, there is no server's name match the given name
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//flase will return
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return result;
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}//isGinvenServerInList
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/**
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* Method to determine its index in server list for a given server.
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* If couldn't find it, -1 will be returned
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* @param givenServerName, a server name will be check.
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*/
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private synchronized int findIndexInServerList(String givenServerName)
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{
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int index = -1;//Variable store the return value
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ReplicationServer server = null; //Element in vetor
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int size = 0;//Variable to store the size of vector serverList
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//Get the size of vector
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size = serverList.size();
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//If server list is empty, -1 will be returned
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if (size == 0 || givenServerName ==null ||givenServerName.equals(""))
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{
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return index;
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}
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//Check every element in the vector
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for (int i = 0; i < size; i++)
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{
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//Get the ReplicationServer object indexed i in vector
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server = (ReplicationServer) serverList.elementAt(i);
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//If given name match a server's name, return true
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if ( givenServerName.equalsIgnoreCase(server.getServerName()))
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{
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index = i;
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return index;
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}//if
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}//for
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//If reach here, there is no server's name match the given name
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//-1 will return
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return index;
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}//isGinvenServerInList
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/**
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* To a given server name, try to get its lastcheck date.
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* If couldn't find the server in the server list, null will return
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* @param givenServerName, the server's name which we want to get last checked
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* out date
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*/
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329 |
6118
|
leinfelder
|
public synchronized Date getLastCheckedDate(String givenServerName)
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330 |
1292
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tao
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{
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331 |
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int index = -1;//Variable to store the index
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ReplicationServer server = null;//Variable for replication server
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//Get the server's index in server list
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index = findIndexInServerList(givenServerName);
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//If index = -1, couldn't find this server, null will return
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if (index == -1)
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{
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return null;
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}//if
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//Get Replication server object
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server = (ReplicationServer) serverList.elementAt(index);
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//return its lastcheckeddate attributes in this object
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return server.getLastCheckedDate();
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}//getLastCehckedDate
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/**
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348 |
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* To a given server name, try to get its xml replciation option
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349 |
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* If couldn't find the server in the server list, false will return
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* @param givenServerName, the server's name which we want to get replication
|
351 |
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* value
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352 |
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*/
|
353 |
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|
public synchronized boolean getReplicationValue(String givenServerName)
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{
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int index = -1;//Variable to store the index
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ReplicationServer server = null;//Variable for replication server
|
357 |
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//Get the server's index in server list
|
359 |
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index = findIndexInServerList(givenServerName);
|
360 |
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//If index = -1, couldn't find this server, null will return
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361 |
|
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if (index == -1)
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362 |
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{
|
363 |
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return false;
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364 |
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|
}//if
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365 |
|
|
//Get Replication server object
|
366 |
|
|
server = (ReplicationServer) serverList.elementAt(index);
|
367 |
|
|
//return this object's replication value
|
368 |
|
|
return server.getReplication();
|
369 |
|
|
}//getReplicationValue
|
370 |
|
|
|
371 |
|
|
/**
|
372 |
|
|
* To a given server name, try to get its data file replciation option
|
373 |
|
|
* If couldn't find the server in the server list, false will return
|
374 |
|
|
* @param givenServerName, the server's name which we want to get data file
|
375 |
|
|
* replication value
|
376 |
|
|
*/
|
377 |
|
|
public synchronized boolean getDataReplicationValue(String givenServerName)
|
378 |
|
|
{
|
379 |
|
|
int index = -1;//Variable to store the index
|
380 |
|
|
ReplicationServer server = null;//Variable for replication server
|
381 |
|
|
|
382 |
|
|
//Get the server's index in server list
|
383 |
|
|
index = findIndexInServerList(givenServerName);
|
384 |
|
|
//If index = -1, couldn't find this server, null will return
|
385 |
|
|
if (index == -1)
|
386 |
|
|
{
|
387 |
|
|
return false;
|
388 |
|
|
}//if
|
389 |
|
|
//Get Replication server object
|
390 |
|
|
server = (ReplicationServer) serverList.elementAt(index);
|
391 |
|
|
//Return this object's data replication value
|
392 |
|
|
return server.getDataReplication();
|
393 |
|
|
}//getDataReplicationValue
|
394 |
6135
|
leinfelder
|
|
395 |
|
|
/**
|
396 |
|
|
* To a given server name, try to get its data file replciation option
|
397 |
|
|
* If couldn't find the server in the server list, false will return
|
398 |
|
|
* @param givenServerName, the server's name which we want to get data file
|
399 |
|
|
* replication value
|
400 |
|
|
*/
|
401 |
|
|
public synchronized boolean getSystemMetadataReplicationValue(String givenServerName)
|
402 |
|
|
{
|
403 |
|
|
int index = -1;//Variable to store the index
|
404 |
|
|
ReplicationServer server = null;//Variable for replication server
|
405 |
|
|
|
406 |
|
|
//Get the server's index in server list
|
407 |
|
|
index = findIndexInServerList(givenServerName);
|
408 |
|
|
//If index = -1, couldn't find this server, null will return
|
409 |
|
|
if (index == -1)
|
410 |
|
|
{
|
411 |
|
|
return false;
|
412 |
|
|
}//if
|
413 |
|
|
//Get Replication server object
|
414 |
|
|
server = (ReplicationServer) serverList.elementAt(index);
|
415 |
|
|
//Return this object's data replication value
|
416 |
|
|
return server.isSystemMetadataReplication();
|
417 |
|
|
}
|
418 |
1292
|
tao
|
|
419 |
|
|
/**
|
420 |
|
|
* To a given server name, try to get its hub option
|
421 |
|
|
* If couldn't find the server in the server list, false will return
|
422 |
|
|
* @param givenServerName, the server's name which we want to get hub
|
423 |
|
|
*/
|
424 |
|
|
public synchronized boolean getHubValue(String givenServerName)
|
425 |
|
|
{
|
426 |
|
|
int index = -1;//Variable to store the index
|
427 |
|
|
ReplicationServer server = null;//Variable for replication server
|
428 |
|
|
|
429 |
|
|
//Get the server's index in server list
|
430 |
|
|
index = findIndexInServerList(givenServerName);
|
431 |
|
|
//If index = -1, couldn't find this server, null will return
|
432 |
|
|
if (index == -1)
|
433 |
|
|
{
|
434 |
|
|
return false;
|
435 |
|
|
}//if
|
436 |
|
|
//Get Replication server object
|
437 |
|
|
server = (ReplicationServer) serverList.elementAt(index);
|
438 |
|
|
//Return this object's hub value
|
439 |
|
|
return server.getHub();
|
440 |
|
|
}//getHubValue
|
441 |
|
|
|
442 |
|
|
/**
|
443 |
|
|
* To a given server name, to check if it is in the server list.
|
444 |
|
|
* If it is not, add it to server list and the xml_replication table
|
445 |
|
|
* This method is for a document was replicated by a hub and the document's
|
446 |
|
|
* home server is not in the replication table. The value for replicate,
|
447 |
|
|
* datareplicate and hub are all false
|
448 |
|
|
* @param givenServerName, the server's name which want to check
|
449 |
|
|
*/
|
450 |
|
|
public synchronized void addToServerListIfItIsNot(String givenServerName)
|
451 |
|
|
{
|
452 |
|
|
// Variable to store the index for the givenServerName
|
453 |
|
|
int index = -1;
|
454 |
|
|
// Variable to store the new replciation server object
|
455 |
|
|
ReplicationServer newServer = null;
|
456 |
|
|
// For sql command
|
457 |
|
|
PreparedStatement pStmt=null;
|
458 |
|
|
// For check out DBConnection
|
459 |
|
|
DBConnection dbConn = null;
|
460 |
|
|
int serialNumber = -1;
|
461 |
|
|
// Field value for xml_replication table
|
462 |
|
|
int replicate = 0;
|
463 |
|
|
int dataReplicate = 0;
|
464 |
|
|
int hub = 0;
|
465 |
|
|
|
466 |
|
|
// Get the the index
|
467 |
|
|
index = findIndexInServerList(givenServerName);
|
468 |
|
|
// if index ==-1, it not in the server list
|
469 |
|
|
// Add the server to server list
|
470 |
|
|
// Add the server to xml_replication table
|
471 |
|
|
if (index ==-1)
|
472 |
|
|
{
|
473 |
|
|
// Create a new replication server object it's replicate, datareplicate
|
474 |
|
|
// and hub values are default - false
|
475 |
|
|
newServer = new ReplicationServer();
|
476 |
|
|
// Set newServer's name as givenServerName
|
477 |
|
|
newServer.setServerName(givenServerName);
|
478 |
|
|
// Add newServer to serverList
|
479 |
|
|
this.addNewReplicationServer(newServer);
|
480 |
|
|
// Add this server to xml_table too
|
481 |
|
|
try
|
482 |
|
|
{
|
483 |
6595
|
leinfelder
|
Calendar cal = Calendar.getInstance();
|
484 |
|
|
cal.set(1980, 1, 1);
|
485 |
1292
|
tao
|
// Checkout DBConnection
|
486 |
|
|
dbConn=DBConnectionPool.
|
487 |
|
|
getDBConnection("ReplicationSErverList.addToServerListIfItIsNot");
|
488 |
|
|
serialNumber=dbConn.getCheckOutSerialNumber();
|
489 |
|
|
// Inser it into xml_replication table
|
490 |
1751
|
tao
|
/*pStmt = dbConn.prepareStatement("INSERT INTO xml_replication " +
|
491 |
1292
|
tao
|
"(server, last_checked, replicate, datareplicate, hub) "+
|
492 |
|
|
"VALUES ('" + givenServerName + "', to_date(" +
|
493 |
|
|
"'01/01/00', 'MM/DD/YY'), '" +
|
494 |
1751
|
tao
|
replicate +"', '"+dataReplicate+"','"+ hub + "')");*/
|
495 |
|
|
pStmt = dbConn.prepareStatement("INSERT INTO xml_replication " +
|
496 |
|
|
"(server, last_checked, replicate, datareplicate, hub) "+
|
497 |
6595
|
leinfelder
|
"VALUES (?, ?, ?, ?, ?, ?)");
|
498 |
|
|
pStmt.setString(1, givenServerName);
|
499 |
|
|
pStmt.setTimestamp(2, new Timestamp(cal.getTimeInMillis()) );
|
500 |
|
|
pStmt.setInt(3, replicate);
|
501 |
|
|
pStmt.setInt(4, dataReplicate);
|
502 |
|
|
pStmt.setInt(5, hub);
|
503 |
|
|
|
504 |
1292
|
tao
|
pStmt.execute();
|
505 |
1757
|
tao
|
|
506 |
1292
|
tao
|
pStmt.close();
|
507 |
|
|
}//try
|
508 |
|
|
catch (Exception e)
|
509 |
|
|
{
|
510 |
2663
|
sgarg
|
logMetacat.error("Error in ReplicationServerList."+
|
511 |
|
|
"addToServerListIfItIsNot: " + e.getMessage());
|
512 |
1292
|
tao
|
}//catch
|
513 |
|
|
finally
|
514 |
|
|
{
|
515 |
|
|
try
|
516 |
|
|
{
|
517 |
|
|
pStmt.close();
|
518 |
|
|
}//try
|
519 |
|
|
catch (Exception ee)
|
520 |
|
|
{
|
521 |
2663
|
sgarg
|
logMetacat.error("Error in ReplicationServerList."+
|
522 |
|
|
"addToServerListIfItIsNot: " + ee.getMessage());
|
523 |
1292
|
tao
|
}//catch
|
524 |
|
|
finally
|
525 |
|
|
{
|
526 |
|
|
DBConnectionPool.returnDBConnection(dbConn, serialNumber);
|
527 |
|
|
}//finally
|
528 |
|
|
}//finally
|
529 |
|
|
}//if
|
530 |
|
|
}//addToServerListIfItIsNot
|
531 |
|
|
|
532 |
|
|
}//ReplicationServerList
|