Example usage for javax.jms QueueBrowser getEnumeration

Introduction

In this page you can find the example usage for javax.jms QueueBrowser getEnumeration.

Prototype

Enumeration getEnumeration() throws JMSException;

Source Link

Document

Gets an enumeration for browsing the current queue messages in the order they would be received.

Usage

From source file:nl.nn.adapterframework.jms.JmsMessageBrowser.java

protected Message doBrowse(Map selectors) throws ListenerException {
    QueueSession session = null;//from   w w  w . ja  v a  2s.  c  om
    Message msg = null;
    QueueBrowser queueBrowser = null;
    try {
        session = (QueueSession) createSession();
        queueBrowser = session.createBrowser((Queue) getDestination(), getCombinedSelector(selectors));
        Enumeration msgenum = queueBrowser.getEnumeration();
        if (msgenum.hasMoreElements()) {
            msg = (Message) msgenum.nextElement();
        }
        return msg;
    } catch (Exception e) {
        throw new ListenerException(e);
    } finally {
        try {
            if (queueBrowser != null) {
                queueBrowser.close();
            }
        } catch (JMSException e1) {
            throw new ListenerException("exception closing queueBrowser", e1);
        }
        closeSession(session);
    }
}

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From source file:org.apache.activemq.apollo.JmsQueueBrowserTest.java

/**
 * Tests the queue browser. Browses the messages then the consumer tries to receive them. The messages should still
 * be in the queue even when it was browsed.
 *
 * Re-enable once https://issues.apache.org/jira/browse/APLO-226 is fixed.
 *
 * @throws Exception/*ww  w.j av a  2  s  . c o  m*/
 */
public void testReceiveBrowseReceive() throws Exception {
    Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
    ActiveMQQueue destination = new ActiveMQQueue("TEST");
    MessageProducer producer = session.createProducer(destination);
    MessageConsumer consumer = session.createConsumer(destination);
    connection.start();

    Message[] outbound = new Message[] { session.createTextMessage("First Message"),
            session.createTextMessage("Second Message"), session.createTextMessage("Third Message") };

    // lets consume any outstanding messages from previous test runs
    while (consumer.receive(1000) != null) {
    }

    producer.send(outbound[0]);
    producer.send(outbound[1]);
    producer.send(outbound[2]);

    // Get the first.
    assertEquals(outbound[0], consumer.receive(1000));
    consumer.close();
    //Thread.sleep(200);

    QueueBrowser browser = session.createBrowser((Queue) destination);
    Enumeration enumeration = browser.getEnumeration();

    // browse the second
    assertTrue("should have received the second message", enumeration.hasMoreElements());
    assertEquals(outbound[1], (Message) enumeration.nextElement());

    // browse the third.
    assertTrue("Should have received the third message", enumeration.hasMoreElements());
    assertEquals(outbound[2], (Message) enumeration.nextElement());

    // There should be no more.
    boolean tooMany = false;
    while (enumeration.hasMoreElements()) {
        LOG.info("Got extra message: " + ((TextMessage) enumeration.nextElement()).getText());
        tooMany = true;
    }
    assertFalse(tooMany);
    browser.close();

    // Re-open the consumer.
    consumer = session.createConsumer(destination);
    // Receive the second.
    assertEquals(outbound[1], consumer.receive(1000));
    // Receive the third.
    assertEquals(outbound[2], consumer.receive(1000));
    consumer.close();

}

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From source file:org.apache.activemq.apollo.JmsQueueBrowserTest.java

public void testBrowseReceive() throws Exception {
    Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
    ActiveMQQueue destination = new ActiveMQQueue("TEST");

    connection.start();//from   w w w .  ja v a  2s  .  c  o m

    Message[] outbound = new Message[] { session.createTextMessage("First Message"),
            session.createTextMessage("Second Message"), session.createTextMessage("Third Message") };

    MessageProducer producer = session.createProducer(destination);
    producer.send(outbound[0]);

    // create browser first
    QueueBrowser browser = session.createBrowser((Queue) destination);
    Enumeration enumeration = browser.getEnumeration();

    // create consumer
    MessageConsumer consumer = session.createConsumer(destination);

    // browse the first message
    assertTrue("should have received the first message", enumeration.hasMoreElements());
    assertEquals(outbound[0], (Message) enumeration.nextElement());

    // Receive the first message.
    assertEquals(outbound[0], consumer.receive(1000));
    consumer.close();
    browser.close();
    producer.close();

}

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From source file:org.apache.activemq.apollo.JmsQueueBrowserTest.java

public void testQueueBrowserWith2Consumers() throws Exception {
    final int numMessages = 1000;
    //        connection.setAlwaysSyncSend(false);
    Session session = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
    ActiveMQQueue destination = new ActiveMQQueue("TEST");
    ActiveMQQueue destinationPrefetch10 = new ActiveMQQueue("TEST?jms.prefetchSize=10");
    ActiveMQQueue destinationPrefetch1 = new ActiveMQQueue("TEST?jms.prefetchsize=1");
    connection.start();/*  w ww  .  j ava2s .  c o  m*/

    Connection connection2 = factory.createConnection(userName, password);
    connection2.start();
    connections.add(connection2);
    Session session2 = connection2.createSession(false, Session.AUTO_ACKNOWLEDGE);

    MessageProducer producer = session.createProducer(destination);
    MessageConsumer consumer = session.createConsumer(destinationPrefetch10);

    for (int i = 0; i < numMessages; i++) {
        TextMessage message = session.createTextMessage("Message: " + i);
        producer.send(message);
    }

    QueueBrowser browser = session2.createBrowser(destinationPrefetch1);
    Enumeration<Message> browserView = browser.getEnumeration();

    List<Message> messages = new ArrayList<Message>();
    for (int i = 0; i < numMessages; i++) {
        Message m1 = consumer.receive(5000);
        assertNotNull("m1 is null for index: " + i, m1);
        messages.add(m1);
    }

    int i = 0;
    for (; i < numMessages && browserView.hasMoreElements(); i++) {
        Message m1 = messages.get(i);
        Message m2 = browserView.nextElement();
        assertNotNull("m2 is null for index: " + i, m2);
        assertEquals(m1.getJMSMessageID(), m2.getJMSMessageID());
    }

    // currently browse max page size is ignored for a queue browser consumer
    // only guarantee is a page size - but a snapshot of pagedinpending is
    // used so it is most likely more
    assertTrue("got at least our expected minimum in the browser: ", i > 200);

    assertFalse("nothing left in the browser", browserView.hasMoreElements());
    assertNull("consumer finished", consumer.receiveNoWait());
}

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From source file:org.apache.activemq.apollo.JmsQueueBrowserTest.java

public void testBrowseClose() throws Exception {
    Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
    ActiveMQQueue destination = new ActiveMQQueue("TEST");

    connection.start();/*from   ww  w.j  a  va  2 s. c  o m*/

    TextMessage[] outbound = new TextMessage[] { session.createTextMessage("First Message"),
            session.createTextMessage("Second Message"), session.createTextMessage("Third Message") };

    MessageProducer producer = session.createProducer(destination);
    producer.send(outbound[0]);
    producer.send(outbound[1]);
    producer.send(outbound[2]);

    // create browser first
    QueueBrowser browser = session.createBrowser((Queue) destination);
    Enumeration enumeration = browser.getEnumeration();

    // browse some messages
    assertEquals(outbound[0], (Message) enumeration.nextElement());
    assertEquals(outbound[1], (Message) enumeration.nextElement());
    //assertEquals(outbound[2], (Message) enumeration.nextElement());

    browser.close();

    // create consumer
    MessageConsumer consumer = session.createConsumer(destination);

    // Receive the first message.
    TextMessage msg = (TextMessage) consumer.receive(1000);
    assertEquals("Expected " + outbound[0].getText() + " but received " + msg.getText(), outbound[0], msg);
    msg = (TextMessage) consumer.receive(1000);
    assertEquals("Expected " + outbound[1].getText() + " but received " + msg.getText(), outbound[1], msg);
    msg = (TextMessage) consumer.receive(1000);
    assertEquals("Expected " + outbound[2].getText() + " but received " + msg.getText(), outbound[2], msg);

    consumer.close();
    producer.close();

}

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From source file:org.apache.activemq.leveldb.test.ReplicatedLevelDBBrokerTest.java

private ArrayList<String> browseMessagesViaJMS(BrokerService brokerService) throws Exception {
    ArrayList<String> rc = new ArrayList<String>();
    ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory(
            "tcp://localhost:" + connectPort(brokerService));
    Connection connection = factory.createConnection();
    try {//from www . j a v  a  2 s .  c o  m
        connection.start();
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        QueueBrowser browser = session.createBrowser(session.createQueue("FOO"));
        Enumeration enumeration = browser.getEnumeration();
        while (enumeration.hasMoreElements()) {
            TextMessage textMessage = (TextMessage) enumeration.nextElement();
            rc.add(textMessage.getText());
        }
    } finally {
        connection.close();
    }
    return rc;
}

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From source file:org.apache.activemq.network.BrokerNetworkWithStuckMessagesTest.java

@SuppressWarnings({ "unchecked", "unused" })
private Object[] browseQueueWithJms(BrokerService broker) throws Exception {
    Object[] messages = null;//  w  ww . j a  va2s .c  o  m
    Connection connection = null;
    Session session = null;

    try {
        URI brokerUri = connector.getUri();
        ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(brokerUri.toString());
        connection = connectionFactory.createConnection();
        connection.start();
        session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        Queue destination = session.createQueue(queueName);
        QueueBrowser browser = session.createBrowser(destination);
        List<Message> list = new ArrayList<Message>();
        for (Enumeration<Message> enumn = browser.getEnumeration(); enumn.hasMoreElements();) {
            list.add(enumn.nextElement());
        }
        messages = list.toArray();
    } finally {
        if (session != null) {
            session.close();
        }
        if (connection != null) {
            connection.close();
        }
    }
    LOG.info("+Browsed with JMS: " + messages.length);

    return messages;
}

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From source file:org.apache.james.queue.jms.JMSMailQueue.java

@Override
@SuppressWarnings("unchecked")
public MailQueueIterator browse() throws MailQueueException {
    QueueBrowser browser = null;
    try {/*  w  w w.j  a  v a2 s. co m*/
        browser = session.createBrowser(queue);

        Enumeration<Message> messages = browser.getEnumeration();
        QueueBrowser myBrowser = browser;

        return new MailQueueIterator() {

            @Override
            public void remove() {
                throw new UnsupportedOperationException("Read-only");
            }

            @Override
            public MailQueueItemView next() {
                while (hasNext()) {
                    try {
                        Message m = messages.nextElement();
                        return new MailQueueItemView(createMail(m), nextDeliveryDate(m));
                    } catch (MessagingException | JMSException e) {
                        LOGGER.error("Unable to browse queue", e);
                    }
                }

                throw new NoSuchElementException();
            }

            private ZonedDateTime nextDeliveryDate(Message m) throws JMSException {
                long nextDeliveryTimestamp = m.getLongProperty(JAMES_NEXT_DELIVERY);
                return Instant.ofEpochMilli(nextDeliveryTimestamp).atZone(ZoneId.systemDefault());
            }

            @Override
            public boolean hasNext() {
                return messages.hasMoreElements();
            }

            @Override
            public void close() {
                closeBrowser(myBrowser);
            }
        };

    } catch (Exception e) {
        closeBrowser(browser);

        LOGGER.error("Unable to browse queue {}", queueName, e);
        throw new MailQueueException("Unable to browse queue " + queueName, e);
    }
}

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From source file:org.dhatim.routing.jms.JMSRouter.java

private int getQueueLength(QueueBrowser queueBrowser) throws JMSException {
    int length = 0;
    Enumeration queueEnum = queueBrowser.getEnumeration();
    while (queueEnum.hasMoreElements()) {
        length++;// www  .  j a  va 2  s.  co  m
        queueEnum.nextElement();
    }
    return length;
}

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From source file:org.easybatch.jms.JmsIntegrationTest.java

@Test
public void testJmsRecordWriter() throws Exception {
    Context jndiContext = getJndiContext();
    Queue queue = (Queue) jndiContext.lookup("q");
    QueueConnectionFactory queueConnectionFactory = (QueueConnectionFactory) jndiContext
            .lookup("QueueConnectionFactory");
    QueueConnection queueConnection = queueConnectionFactory.createQueueConnection();
    QueueSession queueSession = queueConnection.createQueueSession(false, Session.AUTO_ACKNOWLEDGE);
    queueConnection.start();//from  w ww  .j a va 2 s.c o  m

    String dataSource = "foo" + LINE_SEPARATOR + "bar";

    aNewJob().reader(new StringRecordReader(dataSource)).processor(new JmsMessageTransformer(queueSession))
            .writer(new JmsQueueRecordWriter(queueConnectionFactory, queue)).call();

    // Assert that queue contains 2 messages: "foo" and "bar"
    QueueBrowser queueBrowser = queueSession.createBrowser(queue);
    Enumeration enumeration = queueBrowser.getEnumeration();

    assertThat(enumeration.hasMoreElements()).isTrue();
    TextMessage message1 = (TextMessage) enumeration.nextElement();
    assertThat(message1.getText()).isEqualTo("foo");

    assertThat(enumeration.hasMoreElements()).isTrue();
    TextMessage message2 = (TextMessage) enumeration.nextElement();
    assertThat(message2.getText()).isEqualTo("bar");

    assertThat(enumeration.hasMoreElements()).isFalse();

    queueSession.close();
    queueConnection.close();
}

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