WebSphere MQ for Java programming example-implementing MQ trigger-Example

The source code of mqtrigger. Java is as follows:

import java.io.*;import java.lang.*;import com.ibm.mq.*;class MQTrigger{    private String structId;    private String version;    private String qName;    private String processName;    private String triggerData;    private String applType;    private String applId;    private String envData;    private String userData;    private String qMgrName;    /******************************************************/    /* Constructor to parse the MQTMC2 stucture and set */    /* the class attributes. */    /* Values derived from field definitions given for */    /* MQTMC2 in the WebSphere Application Programming */    /* Reference. */    /******************************************************/    public MQTrigger(String tmcStruct) throws StringIndexOutOfBoundsException    {        structId = tmcStruct.substring(0,3).trim();        version = tmcStruct.substring(4,8).trim();        qName = tmcStruct.substring(8,55).trim();        processName = tmcStruct.substring(56,103).trim();        triggerData = tmcStruct.substring(104,167).trim();        applType = tmcStruct.substring(168,171).trim();        applId = tmcStruct.substring(172,427).trim();        envData = tmcStruct.substring(428,555).trim();        userData = tmcStruct.substring(556,683).trim();        qMgrName = tmcStruct.substring(684,730).trim();    }    public String getStructId()    {        return(structId);    }    public String getVersion()    {        return(version);    }    public String getQueueName()    {        return(qName);    }    public String getProcessName()    {        return(processName);    }    public String getTriggerData()    {        return(triggerData);    }    public String getApplicationType()    {        return(applType);    }    public String getApplicationId()    {        return(applId);    }    public String getEnvironmentData()    {        return(envData);    }    public String getUserData()    {        return(userData);    }    public String getQueueManagerName()    {        return(qMgrName);    }}

 

 

Javatrigger. Java source code is as follows:

import java.io.IOException;import com.ibm.mq.MQC;import com.ibm.mq.MQException;import com.ibm.mq.MQGetMessageOptions;import com.ibm.mq.MQMessage;import com.ibm.mq.MQQueue;import com.ibm.mq.MQQueueManager;public class JavaTrigger{    private MQQueueManager qMgr;    public static void main (String args[]) throws IOException    {        if (args.length < 1)        {            System.out.println("This must be a triggered application");        }        else        {            JavaTrigger jt = new JavaTrigger();            jt.start(args);        }        System.exit(0);    }    public void start(String args[])    {        try        {            MQException.log = null;            /******************************************************/            /* Create a MQTrigger class object to read the MQTMC2 */            /* structure into the correct attribute. */            /******************************************************/            MQTrigger tmc = new MQTrigger(args[0]);            /******************************************************/            /* Connect to the queue manager identified by the */            /* trigger. */            /******************************************************/            qMgr = new MQQueueManager(tmc.getQueueManagerName());            /******************************************************/            /* Open the queue identified by the trigger. */            /******************************************************/            int openOptions = MQC.MQOO_INPUT_AS_Q_DEF            | MQC.MQOO_FAIL_IF_QUIESCING;            MQQueue triggerQueue = qMgr.accessQueue(tmc.getQueueName(),            openOptions,            null, null, null);            /******************************************************/            /* Set up our options to get the first message */            /* Wait 5 seconds to be cetain all messages are */            /* processed. */            /******************************************************/            MQGetMessageOptions gmo = new MQGetMessageOptions();            gmo.options = MQC.MQGMO_WAIT | MQC.MQGMO_CONVERT;            gmo.waitInterval = 5000;            MQMessage triggerMessage = new MQMessage();            /*****************************************************/            /* Read each message from the queue until there are */            /* no more messages to get. */            /*****************************************************/            long rc = 0;            do            {                rc = 0;                try                {                    /***********************************************/                    /* Set the messageId and correlationId to none */                    /* to get all messages with no message */                    /* selection. */                    /***********************************************/                    triggerMessage.clearMessage();                    triggerMessage.correlationId = MQC.MQCI_NONE;                    triggerMessage.messageId = MQC.MQMI_NONE;                    triggerQueue.get(triggerMessage, gmo);                    String msg = triggerMessage.readString(triggerMessage.getMessageLength());                    /***********************************************/                    /* Insert business logic for the message here. */                    /* For this sample, echo the first 20 */                    /* characters of the message. */                    /***********************************************/                    if (msg.length() > 20)                    {                        System.out.println("Message: " + msg.substring(0,20));                    }                    else                    {                        System.out.println("Message: " + msg);                    }                }                catch (MQException mqEx)                {                    rc = mqEx.reasonCode;                    if (rc != MQException.MQRC_NO_MSG_AVAILABLE)                    {                        System.out.println(" PUT Message failed with rc = "                        + rc);                    }                }                catch (Exception ex)                {                    System.out.println("Generic exception: " + ex);                    rc = 1;                }            } while (rc == 0);            /**********************************************************/            /* Cleanup MQ resources prior to exiting. */            /**********************************************************/            triggerQueue.close();            qMgr.disconnect();        }        catch (MQException mqEx)        {            System.out.println("MQ failed with completion code = "            + mqEx.completionCode            + " and reason code = " + mqEx.reasonCode);        }    }}

 

 

Reprinted: http://ganquan.itpub.net/post/8445/290844