Example usage for com.rabbitmq.client Channel queueDeclarePassive

Introduction

In this page you can find the example usage for com.rabbitmq.client Channel queueDeclarePassive.

Prototype

Queue.DeclareOk queueDeclarePassive(String queue) throws IOException;

Source Link

Document

Declare a queue passively; i.e., check if it exists.

Usage

From source file:pl.nask.hsn2.bus.rabbitmq.RbtUtils.java

License:Open Source License

/**
 * Gets a count of messages in given queue.
 * /* ww  w. j av  a 2s . c o  m*/
 * @param connection Connection to Rabbit MQ server.
 * @param queueName Name of the queue to check.
 * @return Number of messages in the queue.
 * @throws BusException Any problem with connection or queue will thrown an exception.
 */
public static int getMessageCount(Connection connection, String queueName) throws BusException {
    Channel channel = createChannel(connection);
    try {
        DeclareOk ok = channel.queueDeclarePassive(queueName);
        return ok.getMessageCount();
    } catch (IOException ex) {
        throw new BusException(ex);
    } finally {
        closeChannel(channel);
    }
}

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From source file:pl.nask.hsn2.bus.rabbitmq.RbtUtils.java

License:Open Source License

/**
 * Gets a count of consumers attached to given queue.
 * /*  www.  j a  v a  2s  . co  m*/
 * @param connection Connection to Rabbit MQ server.
 * @param queueName Name of the queue to check.
 * @return Number of consumers attached to the queue.
 * @throws BusException Any problem with connection or queue will thrown an exception.
 */
public static int getConsumersCount(Connection connection, String queueName) throws BusException {
    Channel channel = createChannel(connection);
    try {
        DeclareOk ok = channel.queueDeclarePassive(queueName);
        return ok.getConsumerCount();
    } catch (IOException ex) {
        throw new BusException(ex);
    } finally {
        closeChannel(channel);
    }
}

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From source file:reactor.rabbitmq.RabbitFluxTests.java

License:Open Source License

@Test
public void declareDeleteResources() throws Exception {
    Channel channel = connection.createChannel();

    final String queueName = UUID.randomUUID().toString();
    final String exchangeName = UUID.randomUUID().toString();

    try {/* w  w w.  java 2  s  .  co  m*/
        CountDownLatch latchCreation = new CountDownLatch(1);
        sender = createSender();
        Disposable resourceCreation = sender.declare(exchange(exchangeName))
                .then(sender.declare(queue(queueName)))
                .then(sender.bind(binding(exchangeName, "a.b", queueName)))
                .doAfterTerminate(() -> latchCreation.countDown()).subscribe();

        assertTrue(latchCreation.await(1, TimeUnit.SECONDS));

        channel.exchangeDeclarePassive(exchangeName);
        channel.queueDeclarePassive(queueName);
        resourceCreation.dispose();

        CountDownLatch latchDeletion = new CountDownLatch(1);

        Disposable resourceDeletion = sender.unbind(binding(exchangeName, "a.b", queueName))
                .then(sender.delete(exchange(exchangeName))).then(sender.delete(queue(queueName)))
                .doAfterTerminate(() -> latchDeletion.countDown()).subscribe();

        assertTrue(latchDeletion.await(1, TimeUnit.SECONDS));
        resourceDeletion.dispose();
    } finally {
        try {
            channel.exchangeDeclarePassive(exchangeName);
            fail("The exchange should have been deleted, exchangeDeclarePassive should have thrown an exception");
        } catch (IOException e) {
            // OK
            channel = connection.createChannel();
        }
        try {
            channel.queueDeclarePassive(queueName);
            fail("The queue should have been deleted, queueDeclarePassive should have thrown an exception");
        } catch (IOException e) {
            // OK
        }
    }
}

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From source file:reactor.rabbitmq.RabbitFluxTests.java

License:Open Source License

@Test
public void declareDeleteResourcesWithOptions() throws Exception {
    Channel channel = connection.createChannel();

    final String queueName = UUID.randomUUID().toString();
    final String exchangeName = UUID.randomUUID().toString();

    try {/*from  www.  j a  va  2 s. c  o m*/
        SenderOptions senderOptions = new SenderOptions();
        Mono<Connection> connectionMono = Mono
                .fromCallable(() -> senderOptions.getConnectionFactory().newConnection());
        AtomicInteger channelMonoCalls = new AtomicInteger(0);
        Mono<Channel> channelMono = connectionMono.map(c -> {
            try {
                channelMonoCalls.incrementAndGet();
                return c.createChannel();
            } catch (Exception e) {
                Exceptions.propagate(e);
            }
            return null;
        });
        senderOptions.connectionMono(connectionMono);
        CountDownLatch latchCreation = new CountDownLatch(1);
        sender = createSender(senderOptions);

        ResourceManagementOptions options = new ResourceManagementOptions().channelMono(channelMono);

        Disposable resourceCreation = sender.declare(exchange(exchangeName), options)
                .then(sender.declare(queue(queueName), options))
                .then(sender.bind(binding(exchangeName, "a.b", queueName), options))
                .doAfterTerminate(() -> latchCreation.countDown()).subscribe();

        assertTrue(latchCreation.await(1, TimeUnit.SECONDS));
        assertEquals(3, channelMonoCalls.get());

        channel.exchangeDeclarePassive(exchangeName);
        channel.queueDeclarePassive(queueName);
        resourceCreation.dispose();

        CountDownLatch latchDeletion = new CountDownLatch(1);

        Disposable resourceDeletion = sender.unbind(binding(exchangeName, "a.b", queueName), options)
                .then(sender.delete(exchange(exchangeName), options))
                .then(sender.delete(queue(queueName), options))
                .doAfterTerminate(() -> latchDeletion.countDown()).subscribe();

        assertTrue(latchDeletion.await(1, TimeUnit.SECONDS));
        assertEquals(3 + 3, channelMonoCalls.get());
        resourceDeletion.dispose();
    } finally {
        try {
            channel.exchangeDeclarePassive(exchangeName);
            fail("The exchange should have been deleted, exchangeDeclarePassive should have thrown an exception");
        } catch (IOException e) {
            // OK
            channel = connection.createChannel();
        }
        try {
            channel.queueDeclarePassive(queueName);
            fail("The queue should have been deleted, queueDeclarePassive should have thrown an exception");
        } catch (IOException e) {
            // OK
        }
    }
}

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From source file:reactor.rabbitmq.ReactorRabbitMqTests.java

License:Open Source License

@Test
public void createResources() throws Exception {
    final Channel channel = connection.createChannel();

    final String queueName = UUID.randomUUID().toString();
    final String exchangeName = UUID.randomUUID().toString();

    try {//  w ww  . ja  v a 2 s . c om
        sender = ReactorRabbitMq.createSender();

        Mono<AMQP.Queue.BindOk> resources = sender
                .createExchange(ExchangeSpecification.exchange().name(exchangeName))
                .then(sender.createQueue(QueueSpecification.queue(queueName)))
                .then(sender.bind(BindingSpecification.binding().queue(queueName).exchange(exchangeName)
                        .routingKey("a.b")));

        resources.block(java.time.Duration.ofSeconds(1));

        channel.exchangeDeclarePassive(exchangeName);
        channel.queueDeclarePassive(queueName);
    } finally {
        channel.exchangeDelete(exchangeName);
        channel.queueDelete(queueName);
        channel.close();
    }
}

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From source file:uk.ac.soton.itinnovation.experimedia.arch.ecc.amqpAPI.impl.amqp.AMQPBasicChannel.java

public static boolean amqpQueueExists(AMQPConnectionFactory conFactory, String queueName) throws Exception {
    // Safety first
    if (conFactory == null)
        throw new Exception("Could not test amqp queue: amqp connection factory is null");
    if (queueName == null)
        throw new Exception("Could not test amqp queue: queue name is null");
    if (!conFactory.isConnectionValid())
        throw new Exception("Could not test amqp queue: factory connection is invalid");

    // Need to create an independent connection & channel to test for a queue -
    // a negative result automatically closes a channel.

    AMQPBasicChannel bc = conFactory.createNewChannel();
    Channel channelImpl = (Channel) bc.getChannelImpl();

    boolean result = false;
    String resultInfo = "AMQP queue ( " + queueName + ") existence result: ";

    if (channelImpl != null && channelImpl.isOpen()) {
        // Try passively declaring the queue to see if it exists
        try {// ww  w  .j av  a 2 s  . c o  m
            channelImpl.queueDeclarePassive(queueName);
            result = true;
            resultInfo += "exists";
            channelImpl.close();
        } catch (IOException ex) {
            resultInfo += "does not exist";
            // Channel will be automatically closed in this case
        }

    } else
        resultInfo += " could not test: channel is null or closed";

    LoggerFactory.getLogger(AMQPBasicChannel.class).info(resultInfo);

    return result;
}

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From source file:vn.com.uet.performance.rabbitmq.MulticastParams.java

License:Open Source License

private static boolean queueExists(Connection connection, final String queueName) throws IOException {
    return queueName != null && exists(connection, new Checker() {
        public void check(Channel ch) throws IOException {
            ch.queueDeclarePassive(queueName);
        }//from w  ww  .j  a  v  a  2  s.  co m
    });
}

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