Java/PCF Program to Delete an IBM MQ Queue

A couple of days ago, I posted a Java/PCF program that would create a IBM MQ queue. So, if you require creating a queue via Java/PCF then you probably will need to delete a queue via Java/PCF.

If you are used to deleting an IBM MQ queue using runmqsc command then the following simple Java/PCF program will delete a IBM MQ queue based on the following runmqsc command:

DELETE QL('TEST.QUEUE') AUTHREC(YES) PURGE

You can download the source code from here.

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Hashtable;

import com.ibm.mq.MQException;
import com.ibm.mq.MQQueueManager;
import com.ibm.mq.constants.CMQC;
import com.ibm.mq.constants.MQConstants;
import com.ibm.mq.headers.MQDataException;
import com.ibm.mq.headers.pcf.PCFException;
import com.ibm.mq.headers.pcf.PCFMessage;
import com.ibm.mq.headers.pcf.PCFMessageAgent;

/**
 * Program Name
 *  MQDeleteQueue01
 *
 * Description
 *  This java class issues a PCF "delete queue" request message to delete a queue. 
 *  
 *  This PCF code is equivalent to issuing the runmqsc command of:
 *     DELETE QL('TEST.QUEUE') AUTHREC(YES) PURGE
 *
 * Sample Command Line Parameters
 *  -m MQA1 -q Queue_Name -h 127.0.0.1 -p 1414 -c TEST.CHL -u UserID -x Password
 *
 * @author Roger Lacroix
 */
public class MQDeleteQueue01
{
   private static final SimpleDateFormat  LOGGER_TIMESTAMP = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss.SSS");

   private Hashtable<String,String> params;
   private Hashtable<String,Object> mqht;

   public MQDeleteQueue01()
   {
      super();
      params = new Hashtable<String,String>();
      mqht = new Hashtable<String,Object>();
   }

   /**
    * Make sure the required parameters are present.
    * @return true/false
    */
   private boolean allParamsPresent()
   {
      boolean b = params.containsKey("-h") && params.containsKey("-p") &&
                  params.containsKey("-c") && params.containsKey("-m") &&
                  params.containsKey("-q") &&
                  params.containsKey("-u") && params.containsKey("-x");
      if (b)
      {
         try
         {
            Integer.parseInt((String) params.get("-p"));
         }
         catch (NumberFormatException e)
         {
            b = false;
         }
      }

      return b;
   }

   /**
    * Extract the command-line parameters and initialize the MQ HashTable.
    * @param args
    * @throws IllegalArgumentException
    */
   private void init(String[] args) throws IllegalArgumentException
   {
      int port = 1414;
      if (args.length > 0 && (args.length % 2) == 0)
      {
         for (int i = 0; i < args.length; i += 2)
         {
            params.put(args[i], args[i + 1]);
         }
      }
      else
      {
         throw new IllegalArgumentException();
      }

      if (allParamsPresent())
      {
         try
         {
            port = Integer.parseInt((String) params.get("-p"));
         }
         catch (NumberFormatException e)
         {
            port = 1414;
         }
         
         mqht.put(CMQC.CHANNEL_PROPERTY, params.get("-c"));
         mqht.put(CMQC.HOST_NAME_PROPERTY, params.get("-h"));
         mqht.put(CMQC.PORT_PROPERTY, new Integer(port));
         mqht.put(CMQC.USER_ID_PROPERTY, params.get("-u"));
         mqht.put(CMQC.PASSWORD_PROPERTY, params.get("-x"));

         // I don't want to see MQ exceptions at the console.
         MQException.log = null;
      }
      else
      {
         throw new IllegalArgumentException();
      }
   }
   
   /**
    * Handle connecting to the queue manager, issuing PCF command then 
    * disconnect from the queue manager. 
    */
   private void doPCF()
   {
      String qMgrName = (String) params.get("-m");
      String qName    = (String) params.get("-q");

      MQQueueManager qMgr = null;
      PCFMessageAgent agent = null;
      PCFMessage   request = null;
      
      try
      {
         qMgr = new MQQueueManager(qMgrName, mqht);
         logger("successfully connected to "+ qMgrName);

         agent = new PCFMessageAgent(qMgr);
         logger("successfully created agent");
      
         // https://www.ibm.com/docs/en/ibm-mq/latest?topic=formats-mqcmd-delete-q-delete-queue
         
         request = new PCFMessage(MQConstants.MQCMD_DELETE_Q);

         // Specify the queue name to be deleted.
         request.addParameter(MQConstants.MQCA_Q_NAME, qName);

         // Specify that the associated authority record is to be deleted too.  
         // Does not apply to z/OS queue managers.
         request.addParameter(MQConstants.MQIACF_REMOVE_AUTHREC, MQConstants.MQRAR_YES);

         // Specify that the queue is to be deleted even if it contains messages. 
         request.addParameter(MQConstants.MQIACF_PURGE, MQConstants.MQPO_YES);

         agent.send(request);
         
         logger("successfully deleted queue: " + qName);
      }
      catch (PCFException pcfe) 
      {
         if (pcfe.reasonCode == MQConstants.MQRC_UNKNOWN_OBJECT_NAME) 
            logger("Error: The queue '" + qName+ "' does not exists on the queue manager '" + qMgrName + "'.");
         else
            logger("CC=" +pcfe.completionCode +  " [" + MQConstants.lookupCompCode(pcfe.completionCode) + "] : RC=" + pcfe.reasonCode + " ["+MQConstants.lookupReasonCode(pcfe.reasonCode)+"]");
      }
      catch (MQException e)
      {
         logger("CC=" +e.completionCode +  " [" + MQConstants.lookupCompCode(e.completionCode) + "] : RC=" + e.reasonCode + " ["+MQConstants.lookupReasonCode(e.reasonCode)+"]");
      }
      catch (IOException e)
      {
         logger("IOException:" +e.getLocalizedMessage());
      }
      catch (MQDataException e)
      {
         logger("MQDataException:" +e.getLocalizedMessage());
      }
      catch (Exception e)
      {
         logger("Exception:" +e.getLocalizedMessage());
      }
      finally
      {
         try
         {
            if (agent != null)
            {
               agent.disconnect();
               logger("disconnected from agent");
            }
         }
         catch (MQDataException e)
         {
            logger("CC=" +e.completionCode + " : RC=" + e.reasonCode);
         }

         try
         {
            if (qMgr != null)
            {
               qMgr.disconnect();
               logger("disconnected from "+ qMgrName);
            }
         }
         catch (MQException e)
         {
            logger("CC=" +e.completionCode + " : RC=" + e.reasonCode);
         }
      }
   }

   /**
    * A simple logger method
    * @param data
    */
   public static void logger(String data)
   {
      String className = Thread.currentThread().getStackTrace()[2].getClassName();

      // Remove the package info.
      if ( (className != null) && (className.lastIndexOf('.') != -1) )
         className = className.substring(className.lastIndexOf('.')+1);

      System.out.println(LOGGER_TIMESTAMP.format(new Date())+" "+className+": "+Thread.currentThread().getStackTrace()[2].getMethodName()+": "+data);
   }

   public static void main(String[] args)
   {
      MQDeleteQueue01 mqcq = new MQDeleteQueue01();
      
      try
      {
         mqcq.init(args);
         mqcq.doPCF();
      }
      catch (IllegalArgumentException e)
      {
         logger("Usage: java MQDeleteQueue01 -m QueueManagerName -q Queue_Name -h host -p port -c channel -u UserID -x Password");
         System.exit(1);
      }

      System.exit(0);
   }
}

Regards,
Roger Lacroix
Capitalware Inc.