/*
Copyright 1999-2011 (c) My-Channels
Copyright (c) 2012-2014 Software AG, Darmstadt, Germany and/or Software AG USA Inc., Reston, VA, USA, and/or its subsidiaries and/or its affiliates and/or their licensors.

Use, reproduction, transfer, publication or disclosure is prohibited except as specifically provided for in your License Agreement with Software AG.
*/
package com.pcbsys.nirvana.apps;

import com.pcbsys.nirvana.client.*;


/**
 * Gets the last EID for a channel specified
 */
public class getLastEID extends nSampleApp {

  private static getLastEID mySelf=null;

  /**
   * This method demonstrates the Nirvana API calls necessary to get the
   * last eid for a channel.
   * It is called after all command line arguments have been received and
   * validated
   *
   * @param realmDetails a String[] containing the possible RNAME values
   * @param cname the channel name to get the last eid for
   */
  private void doit(String[] realmDetails, String cname ) {

    mySelf.constructSession(realmDetails);

    //Gets the last EID for the specified channel
    try{
      nChannelAttributes nca = new nChannelAttributes();
      nca.setName( cname );
      nChannel chan = mySession.findChannel( nca );
      System.out.println( "Last EID: " + chan.getLastEID() );
    }
    catch(nSessionPausedException sp){

    }
    catch (nIllegalArgumentException ex){}
    //Handle errors
    catch(nChannelNotFoundException cnfe){
      System.out.println("The channel specified could not be found.");
      System.out.println("Please ensure that the channel exists in the REALM you connect to.");
      cnfe.printStackTrace();
      System.exit(1);
    }
    catch (nSecurityException se) {
      System.out.println("Insufficient permissions for the requested operation.");
      System.out.println("Please check the ACL settings on the server.");
      se.printStackTrace();
      System.exit(1);
    }
    catch (nSessionNotConnectedException snce) {
      System.out.println("The session object used is not physically connected to the Nirvana realm.");
      System.out.println("Please ensure the realm is up and check your RNAME value.");
      snce.printStackTrace();
      System.exit(1);
    }
    catch (nUnexpectedResponseException ure) {
      System.out.println("The Nirvana REALM has returned an unexpected response.");
      System.out.println("Please ensure the Nirvana REALM and client API used are compatible.");
      ure.printStackTrace();
      System.exit(1);
    }
    catch (nUnknownRemoteRealmException urre) {
      System.out.println("The channel specified resided in a remote realm which could not be found.");
      System.out.println("Please ensure the channel name specified is correct.");
      urre.printStackTrace();
      System.exit(1);
    }
    catch (nRequestTimedOutException rtoe) {
      System.out.println("The requested operation has timed out waiting for a response from the REALM.");
      System.out.println("If this is a very busy REALM ask your administrator to increase the client timeout values.");
      rtoe.printStackTrace();
      System.exit(1);
    }
    catch(nIllegalChannelMode cm){
      System.out.println("The requested channel is a queue and cannot be accessed like a channel");
      System.out.println("Use the queue API's instead");
      cm.printStackTrace();
      System.exit(1);
    }
    //Close the session we opened
    try{
      nSessionFactory.close ( mySession );
    }
    catch(Exception ex){}
    //Close any other sessions within this JVM so that we can exit
    nSessionFactory.shutdown ( );
  }

  protected void processArgs(String[] args){
    switch (args.length){
      case 1:
        if (args[0].equals("-?")) {
          Usage();
          UsageEnv();
        }
        System.getProperties().put("CHANNAME",args[0]);
        break;
    }
  }

  public static void main( String[] args ) {

    //Create an instance for this class
    mySelf = new getLastEID();

    //Process command line arguments
    mySelf.processArgs(args);

    //Process Environment Variables
    nSampleApp.processEnvironmentVariables();

    //Check the channel name specified
    String channelName=null;
    if ( System.getProperty( "CHANNAME" ) != null )
      channelName= System.getProperty( "CHANNAME" ) ;
    else{
      Usage();
      System.exit( 1 );
    }

    //Check the local realm details
    int idx = 0;
    String RNAME=null;
    if ( System.getProperty( "RNAME" ) != null )
      RNAME= System.getProperty( "RNAME" ) ;
    else{
      Usage();
      System.exit( 1 );
    }

    //Process the local REALM RNAME details
    String[] rproperties = new String[4];
    rproperties=parseRealmProperties(RNAME);

    //get the last eid for the channel specified
    mySelf.doit(rproperties, channelName);

  }

  /**
   * Prints the usage message for this class
   */
  private static void Usage() {

    System.out.println( "Usage ...\n" );
    System.out.println("ngetlasteid <channel name>  \n");

    System.out.println(
      "<Required Arguments> \n");
    System.out.println(
      "<channel name> - Channel name parameter to get the last EID for" );

    System.out.println(
      "\n\nNote: -? provides help on environment variables \n");
  }

} // End of getLastEID Class