<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<body link="#355491" alink="#4262a1" vlink="#355491" style="background: #e2e2e2; margin: 0; padding: 20px;">
<div>
<table cellpadding="0" bgcolor="#FFFFFF" border="0" cellspacing="0" style="border: 1px solid #dadada; margin-bottom: 30px; width: 100%; -moz-border-radius: 6px; -webkit-border-radius: 6px;">
<tbody>
<tr>
<td>
<table border="0" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF" style="border: solid 2px #ccc; background: #dadada; width: 100%; -moz-border-radius: 6px; -webkit-border-radius: 6px;">
<tbody>
<tr>
<td bgcolor="#000000" valign="middle" height="58px" style="border-bottom: 1px solid #ccc; padding: 20px; -moz-border-radius-topleft: 3px; -moz-border-radius-topright: 3px; -webkit-border-top-right-radius: 5px; -webkit-border-top-left-radius: 5px;">
<h1 style="color: #333333; font: bold 22px Arial, Helvetica, sans-serif; margin: 0; display: block !important;">
<!-- To have a header image/logo replace the name below with your img tag -->
<!-- Email clients will render the images when the message is read so any image -->
<!-- must be made available on a public server, so that all recipients can load the image. -->
<a href="https://community.jboss.org/index.jspa" style="text-decoration: none; color: #E1E1E1">JBoss Community</a></h1>
</td>
</tr>
<tr>
<td bgcolor="#FFFFFF" style="font: normal 12px Arial, Helvetica, sans-serif; color:#333333; padding: 20px; -moz-border-radius-bottomleft: 4px; -moz-border-radius-bottomright: 4px; -webkit-border-bottom-right-radius: 5px; -webkit-border-bottom-left-radius: 5px;"><h3 style="margin: 10px 0 5px; font-size: 17px; font-weight: normal;">
How to make the JMS receiver client wait till the next message arrives in the queue?
</h3>
<span style="margin-bottom: 10px;">
created by <a href="https://community.jboss.org/people/chithu21">chithu21</a> in <i>JBoss Messaging Development</i> - <a href="https://community.jboss.org/message/747708#747708">View the full discussion</a>
</span>
<hr style="margin: 20px 0; border: none; background-color: #dadada; height: 1px;">
<div class="jive-rendered-content"><p>Hi,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I have a receiver client program and a sender program.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Receiver Program:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import java.io.BufferedReader;</p><p>import java.io.DataInput;</p><p>import java.io.DataInputStream;</p><p>import java.io.File;</p><p>import java.io.FileInputStream;</p><p>import java.io.IOException;</p><p>import java.io.InputStreamReader;</p><p>import java.sql.SQLException;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import javax.jms.JMSException;</p><p>import javax.jms.Message;</p><p>import javax.jms.MessageListener;</p><p>import javax.jms.Queue;</p><p>import javax.jms.QueueReceiver;</p><p>import javax.jms.QueueSession;</p><p>import javax.jms.TextMessage;</p><p>import javax.naming.NamingException;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import com.dcat2.common.Config;</p><p>import com.dcat2.common.Constants;</p><p>import com.dcat2.common.ReadConfig;</p><p>import com.dcat2.logger.LoggerFactory;</p><p>import com.dcat2.logger.LoggerImp;</p><p>import com.dcat2.datatransfer.DbConnection;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import EDU.oswego.cs.dl.util.concurrent.CountDown;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>/**.</p><p> * This class contains methods to read messages from the Queue</p><p> * and inserts them to receiving DB</p><p> *</p><p> * This class needs to be updated after getting spec from XIB,</p><p> * and is just retained as place holder, it will not work on Jboss 6</p><p> * </p><p> * @author Chithra V S</p><p> *</p><p> */</p><p>public class MessageReceiver implements MessageListener {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    /**.</p><p>     * Initialize the logger</p><p>     */</p><p>    private static com.dcat2.logger.LogInterface log =</p><p>            (LoggerImp) LoggerFactory.getLogger(MessageReceiver.class);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    /**.</p><p>     * Initialize the counter</p><p>     */</p><p>    static final int N = 1;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    /**.</p><p>     * Initialize the CountDown which is used to</p><p>     * notify a driver when all threads are complete.</p><p>     */</p><p>    static CountDown done = new CountDown(N);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    /**.</p><p>     * Initialize the DCAT Centre Variable</p><p>     */</p><p>    private static String strDcatCentre = "";</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    /**.</p><p>     * Initialize the Rejection Table Name Variable.</p><p>     */</p><p>    private String strRejectionTable = "";</p><p>    /**.</p><p>     * Initialize the Counter for DB.</p><p>     */</p><p>    private static int count = 0 ;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    /**.</p><p>     * Initialize the ReadConfig</p><p>     */</p><p>    private static ReadConfig readConfig = new ReadConfig();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    /**.</p><p>     * Read the properties file</p><p>     */</p><p>    private static Config config = readConfig.readPropertiesFile();</p><p>    static JMSConnector jmsConnector = new JMSConnector();</p><p>    private boolean quit = false;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    /**.</p><p>     * Constructor</p><p>     */</p><p>    public MessageReceiver() {</p><p>        if (log == null) {</p><p>            System.err.println(</p><p>                    "Failure Creating Logtrace Object!!!");</p><p>        }</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    /**.</p><p>     * Inner class which implements MessageListener</p><p>     * and receives messages from the Queue</p><p>     *</p><p>     */</p><p>   public static class ExListener implements MessageListener {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        DbConnection dbConnection = new DbConnection();</p><p>        /**.</p><p>         *  @see javax.jms.MessageListener#onMessage(javax.jms.Message)</p><p>         *  @param msg - The JMS Message</p><p>         */</p><p>        public void onMessage(Message msg) {</p><p>            log.debug("Inside OnMessage");</p><p>            //done.release();</p><p>            try {</p><p>                String strReceivedMsg = "";</p><p>                if (msg instanceof TextMessage) {</p><p>                    strReceivedMsg = ((TextMessage) msg).getText();</p><p>                } else {</p><p>                    strReceivedMsg = msg.toString();</p><p>                }</p><p>                log.debug("onMessage, recv text=" + strReceivedMsg);</p><p>                </p><p>                if (strReceivedMsg.equalsIgnoreCase("quit")) {</p><p>                    synchronized (this) {</p><p>                        quit = true;</p><p>                        this.notifyAll(); // Notify main thread to quit</p><p>                    }</p><p>                }</p><p>                dbConnection.insertToReceivingDb(strReceivedMsg,</p><p>                        getStrDcatCentre(), config.getRecvMsgTable());</p><p>                count++;</p><p>            } catch (JMSException e) {</p><p>                log.error(</p><p>                        "An exception occured while receiving from Queue : "</p><p>                                                        + e);</p><p>            }</p><p>            finally {</p><p>                try {</p><p>                    //MessageReceiver.done.acquire();</p><p>                    jmsConnector.closePTP();</p><p>                }/* catch (InterruptedException e) {</p><p>                    // TODO Auto-generated catch block</p><p>                    e.printStackTrace();</p><p>                }*/ catch (JMSException e) {</p><p>                    // TODO Auto-generated catch block</p><p>                    e.printStackTrace();</p><p>                }</p><p>                </p><p>            }</p><p>        }</p><p>}</p><p>    /**.</p><p>     * This methods throws an exception when an exception occurs in</p><p>     * the onMessage method</p><p>     * @param exception - Exception</p><p>     */</p><p>    public void onException(final JMSException exception) {</p><p>        log.error("An error occurred: " + exception);</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    /**.</p><p>     * This method is used to receive messages from the in bound queue</p><p>     * and insert them to the receiving database</p><p>     * @param None</p><p>     * @throws JMSException - JMS Exception</p><p>     * @throws NamingException - Naming Exception</p><p>     * @throws InterruptedException - Interrupted Exception</p><p>     * @throws ClassNotFoundException - Class Not Found Exception</p><p>     * @throws SQLException - SQL Exception</p><p>     */</p><p>    public final void receiveMessage() throws JMSException, NamingException,</p><p>            InterruptedException, ClassNotFoundException, SQLException {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        log.debug("Begin receiveMessage method");</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        QueueObject queueObj = jmsConnector.setupPTP(config.getProviderUrl(),</p><p>                config.getXibToCatQueue());</p><p>        QueueSession session = queueObj.getQueueSession();</p><p>        Queue xibToCatQueue = queueObj.getQueue();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        log.debug("Queue Name : " + xibToCatQueue.getQueueName());</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        // Set the async listener for xibToCatQueue</p><p>        QueueReceiver recv = session.createReceiver(xibToCatQueue);</p><p>        log.info("************Receiver Is Ready To Receive Messages************");</p><p>      recv.setMessageListener(new ExListener());</p><p>     </p><p>        synchronized (recv) {</p><p>            while (!quit) {</p><p>                try {</p><p>                    recv.wait();</p><p>                } catch (InterruptedException ie) {</p><p>                }</p><p>            }</p><p>        }</p><p>     </p><p>        recv.close();</p><p>        </p><p>        //log.info(count + " row/rows inserted to " + config.getRecvMsgTable() + " table");</p><p>        //log.info("************Receiving Of Messages Completed************");</p><p>        //log.debug("End receiveMessage method");</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    /**.</p><p>     * This method returns the value of Dcat Centre</p><p>     * @param None</p><p>     * @return strDcatCentre</p><p>     * @exception None</p><p>     */</p><p>    public static String getStrDcatCentre() {</p><p>        return strDcatCentre;</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    /**.</p><p>     * This method sets the value of Dcat Centre</p><p>     * @param strDcatCentre = DCAT Centre Code</p><p>     * @exception None</p><p>     */</p><p>    public final void setStrDcatCentre(final String strDcatCentre) {</p><p>        MessageReceiver.strDcatCentre = strDcatCentre;</p><p>    }</p><p>      </p><p>   public static void main(final String[] args) throws JMSException,</p><p>            NamingException, InterruptedException, ClassNotFoundException,</p><p>            SQLException {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>     </p><p>        MessageReceiver msgReceiver = new MessageReceiver();</p><p>      </p><p>        msgReceiver.receiveMessage();</p><p>    }</p><p>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Sender:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>package com.dcat2.messaging.sendreceive;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import java.util.ArrayList;</p><p>import java.util.Iterator;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import javax.jms.DeliveryMode;</p><p>import javax.jms.JMSException;</p><p>import javax.jms.Queue;</p><p>import javax.jms.QueueSender;</p><p>import javax.jms.QueueSession;</p><p>import javax.jms.TextMessage;</p><p>import javax.naming.NamingException;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import com.dcat2.common.Config;</p><p>import com.dcat2.common.Constants;</p><p>import com.dcat2.common.ReadConfig;</p><p>import com.dcat2.logger.LoggerFactory;</p><p>import com.dcat2.logger.LoggerImp;</p><p>import com.dcat2.datatransfer.DbConnection;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>/**</p><p> * This class has methods to send XML messages to the XIB Queue. Note:Once the</p><p> * XIB details are available, this class may need modification</p><p> *</p><p> * @author Chithra V S</p><p> *</p><p> */</p><p>public class MessageSender {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    /**.</p><p>     * Initialize the logger</p><p>     */</p><p>    private static com.dcat2.logger.LogInterface log =</p><p>            (LoggerImp) LoggerFactory.getLogger(MessageSender.class);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    /**.</p><p>     * Constructor</p><p>     */</p><p>    public MessageSender() {</p><p>        if (log == null) {</p><p>            System.err.println("Failure Creating Logtrace Object!!!");</p><p>        }</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    /**.</p><p>     * This method sends xml message to the out bound queue</p><p>     * @param strKey - Key received at run time</p><p>     * @param strDcatCentre - DCAT Center Code received at run time</p><p>     * @throws JMSException - JMS Exception</p><p>     * @throws NamingException - Naming Exception</p><p>     */</p><p>    public final void sendMessage(final String strKey, final String strDcatCentre)</p><p>            throws JMSException, NamingException {</p><p>        log.debug("Begin sendMessage Method");</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        ReadConfig readValues = new ReadConfig();</p><p>        Config config = readValues.readPropertiesFile();</p><p>        JMSConnector jmsConnector = new JMSConnector();</p><p>        String strStatus = "";</p><p>        String strXMLMessage = "";</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        /*</p><p>         * Read segments from SendMsg Db Table</p><p>         * and sends to the Queue</p><p>         */</p><p>        DbConnection dbConnection = new DbConnection();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        /*QueueObject queueObj = jmsConnector.setupPTP(</p><p>                config.getProviderUrlXib(),</p><p>                config.getCatToXibQueue());*/</p><p>        QueueObject queueObj = jmsConnector.setupPTP(</p><p>                config.getProviderUrlXib(),</p><p>                config.getXibToCatQueue());</p><p>        QueueSession session = queueObj.getQueueSession();</p><p>        Queue catToXibQueue = queueObj.getQueue();</p><p>        log.debug("Queue Name: " + catToXibQueue.getQueueName());</p><p>        QueueSender sender = session.createSender(catToXibQueue);</p><p>        sender.setDeliveryMode(DeliveryMode.PERSISTENT);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        try {</p><p>            ArrayList<String> msgList = dbConnection.readFromSendMsgDb(</p><p>                    config.getSendMsgDb(), strKey, strDcatCentre);</p><p>            Iterator<String> iterator = msgList.iterator();</p><p>            log.info("************Sending Of Messages Started************");</p><p>            while (iterator.hasNext()) {</p><p>                    strXMLMessage = iterator.next();</p><p>                    log.debug("XML Message to be sent : " + strXMLMessage);</p><p>                    TextMessage tm = session.createTextMessage(strXMLMessage);</p><p>                    sender.send(tm);</p><p>                    log.info("Sent Message =" + tm.getText());</p><p>                    strStatus = Constants.RETURN_CODE_OK;</p><p>                }</p><p>        } catch (JMSException e) {</p><p>            // write to log file if the message was not sent</p><p>            log.error("The message: " + strXMLMessage + " was not sent : " + e);</p><p>            strStatus = Constants.RETURN_CODE_NOK;</p><p>        } finally {</p><p>            if (sender != null) {</p><p>                sender.close();</p><p>            }</p><p>            jmsConnector.closePTP();</p><p>        }</p><p>        log.info("************Sending Of Messages Completed************");</p><p>        log.debug("End sendMessage Method");</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>     /**.</p><p>     * Main method</p><p>     * @param args - String array of command line arguments</p><p>     * @throws JMSException - JMS Exception</p><p>     * @throws NamingException - Naming Exception</p><p>     */</p><p>    public static void main(final String[] args) throws JMSException,</p><p>            NamingException {</p><p>        String strKey = args[0];</p><p>        String strDcatCentre = args[1];</p><p>        MessageSender messageSender = new MessageSender();</p><p>        messageSender.sendMessage(strKey, strDcatCentre);</p><p>    }</p><p>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>JMSConnector:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>package com.dcat2.messaging.sendreceive;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import java.util.Properties;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import javax.jms.JMSException;</p><p>import javax.jms.Queue;</p><p>import javax.jms.QueueConnection;</p><p>import javax.jms.QueueConnectionFactory;</p><p>import javax.jms.QueueSession;</p><p>import javax.naming.Context;</p><p>import javax.naming.InitialContext;</p><p>import javax.naming.NamingException;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import com.dcat2.common.Config;</p><p>import com.dcat2.common.ReadConfig;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>/**.</p><p> * This class contains methods to setup a point to point connection</p><p> * to a JMS Queue</p><p> *</p><p> * @author Chithra V S</p><p> *</p><p> */</p><p>public class JMSConnector {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    /**.</p><p>     * Queue Connection Object</p><p>     */</p><p>    private QueueConnection connection;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    /**.</p><p>     * Queue Session Object</p><p>     */</p><p>    private QueueSession session;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    /**.</p><p>     * This method is used to setup a Point To Point Connection</p><p>     * @param contextUrl - URL of the Queue Provider</p><p>     * @param queueName - Name of the Queue</p><p>     * @return QueueObject</p><p>     * @throws JMSException - JMS Exception</p><p>     * @throws NamingException - Naming Exception</p><p>     */</p><p>    public final QueueObject setupPTP(</p><p>            final String contextUrl, final String queueName)</p><p>            throws JMSException, NamingException {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        ReadConfig readValues = new ReadConfig();</p><p>        Config config = readValues.readPropertiesFile();</p><p>        Properties env = new Properties();</p><p>        env.put(Context.INITIAL_CONTEXT_FACTORY, config.getContextFactory());</p><p>        env.put(Context.SECURITY_PRINCIPAL, config.getJmsUserName());</p><p>        env.put(Context.SECURITY_CREDENTIALS, config.getJmsUserPwd());</p><p>        env.put(Context.PROVIDER_URL, contextUrl);</p><p>        InitialContext iniCtx = new InitialContext(env);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        QueueConnectionFactory qcf = (QueueConnectionFactory)iniCtx.lookup(config.getJmsFactory());</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        connection = qcf.createQueueConnection();</p><p>        String lookUpObj = "java:/" + queueName;</p><p>        Queue xibToCatQueue =  (Queue) iniCtx.lookup(lookUpObj);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        session = connection.createQueueSession(</p><p>                false, QueueSession.AUTO_ACKNOWLEDGE);</p><p>        connection.start();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        return new QueueObject(session, xibToCatQueue);</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    /**.</p><p>     * This method is used to close the Point To Point Connection</p><p>     * @param None</p><p>     * @throws JMSException - JMS Exception</p><p>     */</p><p>    public final void closePTP() throws JMSException {</p><p>        if (session != null) {</p><p>            session.close();</p><p>        }</p><p>        if (connection != null) {</p><p>            connection.stop();</p><p>        }</p><p>    }</p><p>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I ran the MessageReceiver & then ran the MessageSender. The receiver program didnt terminate. But it also didnt trigger the onMessage method to receive the messages.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Any idea what is wrong?</p></div>
<div style="background-color: #f4f4f4; padding: 10px; margin-top: 20px;">
<p style="margin: 0;">Reply to this message by <a href="https://community.jboss.org/message/747708#747708">going to Community</a></p>
<p style="margin: 0;">Start a new discussion in JBoss Messaging Development at <a href="https://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2043">Community</a></p>
</div></td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</div>
</body>
</html>