Example usage for com.rabbitmq.client Channel basicNack

Introduction

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

Prototype

void basicNack(long deliveryTag, boolean multiple, boolean requeue) throws IOException;

Source Link

Document

Reject one or several received messages.

Usage

From source file:uk.ac.sanger.cgp.wwdocker.messages.Messaging.java

License:Open Source License

public void removeFromStateQueue(String queue, String hostToRemove) throws IOException, InterruptedException {
    logger.trace(queue.concat(": ").concat(hostToRemove));
    Connection connectionRcv = getRmqConn();
    Channel channel = connectionRcv.createChannel();
    int maxTries = channel.queueDeclare(queue, true, false, false, null).getMessageCount();
    logger.trace("Queue : messages\t" + queue + " : " + maxTries);

    QueueingConsumer consumer = new QueueingConsumer(channel);
    channel.basicConsume(queue, false, consumer);
    QueueingConsumer.Delivery delivery = consumer.nextDelivery(200);
    logger.trace(maxTries);/*from www  . ja  va2 s. c  o  m*/
    while (delivery != null && maxTries > 0) {
        // the toString in the middle of this is needed as it is wrapped with another type that can hold 4GB
        Map<String, Object> headers = delivery.getProperties().getHeaders();
        if (headers != null && headers.get("host").toString().equals(hostToRemove)) {
            logger.trace(headers.get("host").toString().concat(" remove"));
            channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);
        } else {
            channel.basicNack(delivery.getEnvelope().getDeliveryTag(), false, true);
        }
        delivery = consumer.nextDelivery(200);
        maxTries--;
    }
    channel.close();
    closeRmqConn(connectionRcv);
}

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