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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: leinfelder $'
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* '$Date: 2011-12-21 13:00:40 -0800 (Wed, 21 Dec 2011) $'
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* '$Revision: 6814 $'
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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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/**
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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, 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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//Hub value
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int hubValue = rs.getInt(5);
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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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//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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public synchronized Date getLastCheckedDate(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
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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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* To a given server name, try to get its xml replciation option
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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
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* value
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*/
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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
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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 false;
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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 this object's replication value
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return server.getReplication();
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}//getReplicationValue
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/**
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* To a given server name, try to get its data file replciation option
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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 data file
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* replication value
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*/
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public synchronized boolean getDataReplicationValue(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
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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 false;
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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 this object's data replication value
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return server.getDataReplication();
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}//getDataReplicationValue
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/**
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* To a given server name, try to get its hub option
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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 hub
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*/
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public synchronized boolean getHubValue(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
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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 false;
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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 this object's hub value
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return server.getHub();
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}//getHubValue
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/**
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* To a given server name, to check if it is in the server list.
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* If it is not, add it to server list and the xml_replication table
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* This method is for a document was replicated by a hub and the document's
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* home server is not in the replication table. The value for replicate,
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* datareplicate and hub are all false
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* @param givenServerName, the server's name which want to check
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*/
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public synchronized void addToServerListIfItIsNot(String givenServerName)
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{
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// Variable to store the index for the givenServerName
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int index = -1;
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// Variable to store the new replciation server object
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ReplicationServer newServer = null;
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// For sql command
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PreparedStatement pStmt=null;
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// For check out DBConnection
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DBConnection dbConn = null;
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int serialNumber = -1;
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// Field value for xml_replication table
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int replicate = 0;
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int dataReplicate = 0;
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int hub = 0;
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// Get the the index
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index = findIndexInServerList(givenServerName);
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// if index ==-1, it not in the server list
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// Add the server to server list
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// Add the server to xml_replication table
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if (index ==-1)
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{
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// Create a new replication server object it's replicate, datareplicate
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// and hub values are default - false
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newServer = new ReplicationServer();
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// Set newServer's name as givenServerName
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newServer.setServerName(givenServerName);
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// Add newServer to serverList
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this.addNewReplicationServer(newServer);
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// Add this server to xml_table too
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try
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{
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Calendar cal = Calendar.getInstance();
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cal.set(1980, 1, 1);
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// Checkout DBConnection
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dbConn=DBConnectionPool.
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getDBConnection("ReplicationSErverList.addToServerListIfItIsNot");
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serialNumber=dbConn.getCheckOutSerialNumber();
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459
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// Inser it into xml_replication table
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460
|
/*pStmt = dbConn.prepareStatement("INSERT INTO xml_replication " +
|
461
|
"(server, last_checked, replicate, datareplicate, hub) "+
|
462
|
"VALUES ('" + givenServerName + "', to_date(" +
|
463
|
"'01/01/00', 'MM/DD/YY'), '" +
|
464
|
replicate +"', '"+dataReplicate+"','"+ hub + "')");*/
|
465
|
pStmt = dbConn.prepareStatement("INSERT INTO xml_replication " +
|
466
|
"(server, last_checked, replicate, datareplicate, hub) "+
|
467
|
"VALUES (?, ?, ?, ?, ?, ?)");
|
468
|
pStmt.setString(1, givenServerName);
|
469
|
pStmt.setTimestamp(2, new Timestamp(cal.getTimeInMillis()) );
|
470
|
pStmt.setInt(3, replicate);
|
471
|
pStmt.setInt(4, dataReplicate);
|
472
|
pStmt.setInt(5, hub);
|
473
|
|
474
|
pStmt.execute();
|
475
|
|
476
|
pStmt.close();
|
477
|
}//try
|
478
|
catch (Exception e)
|
479
|
{
|
480
|
logMetacat.error("Error in ReplicationServerList."+
|
481
|
"addToServerListIfItIsNot: " + e.getMessage());
|
482
|
}//catch
|
483
|
finally
|
484
|
{
|
485
|
try
|
486
|
{
|
487
|
pStmt.close();
|
488
|
}//try
|
489
|
catch (Exception ee)
|
490
|
{
|
491
|
logMetacat.error("Error in ReplicationServerList."+
|
492
|
"addToServerListIfItIsNot: " + ee.getMessage());
|
493
|
}//catch
|
494
|
finally
|
495
|
{
|
496
|
DBConnectionPool.returnDBConnection(dbConn, serialNumber);
|
497
|
}//finally
|
498
|
}//finally
|
499
|
}//if
|
500
|
}//addToServerListIfItIsNot
|
501
|
|
502
|
}//ReplicationServerList
|