Retrieving messages from MQ Series

Question

Hi,
We have the situation where we need to receive messages from our partner, who only can use MQ Series to send them. So we are looking into ways how to solve it on our end, which is on a Unix server. We will only read messages, and the other side will be a black box for us which will provide us with settings to connect to their manager.
Do we need to install a client software (which IBM seems to provide for free) and on top of that use a Java API? Or do we use JMS on top of the client?
Or if we use JMS, isn't the client needed?
Thanks

Answer 1

Hi
I am trying to read messages from the MQ using the following code.
The queue used by this program is shared, msg is pushed other program and this progam fetch the msg and save it physically.
I m facing a problem, say there are 15 messages, then 15 files should be created, some time it creates 15 files one for each message, while some times it creates less then 15 files.
String messageType = null;
          String docId = null;
          String idocData = null;
          String fileName = null;
          String msgId = null;
          try {
               // Create a queue manager object and access the queue
     // that will be used for getting the messages.
               qMgr = new MQQueueManager(qManager, env);
               //int openOptions = MQC.MQOO_INPUT_EXCLUSIVE | MQC.MQOO_BROWSE | MQC.MQOO_INQUIRE;
               int openOptions = MQC.MQOO_INPUT_SHARED | MQC.MQOO_BROWSE | MQC.MQOO_INQUIRE | MQC.MQOO_FAIL_IF_QUIESCING;
               queue = qMgr.accessQueue(qName, openOptions, null, null, null);
               MQGetMessageOptions gmo = new MQGetMessageOptions();
               // Get the count of messages present into Queue.
               int messageCnt = queue.getCurrentDepth();
               _logger.info("Current Depth of MQ is : "+ messageCnt);
               if (messageCnt > cnt && cnt != 0) {
                    messageCnt = cnt;
               // If count is greater than Zero then get the message from Queue
               // and creates the file under the target folder.               
               if (messageCnt > 0) {
                    for (int i = 0; i < messageCnt; i++) {
                         _logger.info("Depth of MQ Before reading : "+ queue.getCurrentDepth());
                         messageType = "";
                         docId = "";
                         idocData = "";
                         fileName = "";
                         msgId = "";
                         MQMessage message = new MQMessage();
                         queue.get(message, gmo);
                         byte[] data = new byte[message.getMessageLength()];
                         String msg = null;
                         message.readFully(data);
                         _logger.info("Getting File  : "+ (i+1));
                         try {
                              msg = new String(data);
                              messageType = msg.substring(147, 177).trim();
                              docId = msg.substring(121, 137).trim();
                              idocData = msg.substring(108, msg.length());                              
                              msgId = String.valueOf(System.currentTimeMillis());
                              // Getting inbox folder path                              
                              if (messageType.trim().equalsIgnoreCase("INVOIC01")) {
                                   targetFolder = BOCConfig.getProperty("invoice.inbox.folder");
                              } else if (messageType.trim().equalsIgnoreCase("DELVRY03")) {
                                   targetFolder = BOCConfig.getProperty("asn.inbox.folder");
                              fileName = createFile(idocData, msgId, messageType, targetFolder);                              
                              _logger.info("File Created no " + (i+1) +" with msgId " + msgId + " messageType " + messageType + " DocId " +docId);                              
                              _logger.info("Depth of MQ After reading : "+ queue.getCurrentDepth());
                         } catch (NullPointerException ne) {
                              String strMsg = "Edgeware got junk or null message from MQ which is not proceed by MQ Adapter.";
                              fileName = createFile(idocData, msgId, messageType, failedFolder);
                              raiseAlert(strMsg, messageType, docId, fileName, ne.getMessage());                              
                         } catch (StringIndexOutOfBoundsException siobe) {
                              String strMsg = "Edgeware got invalid message from MQ which is not handled by MQ Adapter.";
                              fileName = createFile(idocData, msgId, messageType, failedFolder);
                              raiseAlert(strMsg, messageType, docId, fileName, siobe.getMessage());                         
                         } catch (Exception e) {
                              String strMsg = "Edgeware got error while creating idoc file or DB transction";
                              fileName = createFile(idocData, msgId, messageType, failedFolder);
                              raiseAlert(strMsg, messageType, docId, fileName, e.getMessage());
               // closing the queue.
               queue.close();
          } catch (MQException ex) {
               String strMsg = "Edgeware got MQ Error while connecting/retrieving message from Queue";
               String err = "MQ exception: CC = " + ex.completionCode + " RC = " + ex.reasonCode;               
               raiseAlert(strMsg, messageType, docId, failedFolder, err);
          } catch (IOException e) {
               String strMsg = "Edgeware got MQ Error while reading message from the Queue";               
               raiseAlert(strMsg, messageType, docId, failedFolder, e.getMessage());               
          }catch (Throwable th) {
               String strMsg = "Edgeware got Runtime Exception";               
               raiseAlert(strMsg, messageType, docId, failedFolder, th.getMessage());               
          }