RabbitMQ Module for Play! Framework

RabbitMQ offers a highly available, scalable and portable messaging system with predictable and consistent throughput and latency. RabbitMQ is the leading implementation of AMQP, the open standard for business messaging, and, through adapters, supports XMPP, SMTP, STOMP and HTTP for lightweight web messaging.

This new module allows you to consume and produce messages on a RabbitMQ instance from your Play! Framework application.

Installation

play install rabbitmq

Configuration

module.rabbitmq=${play.path}/modules/rabbitmq-0.0.1
rabbitmq.host=localhost
rabbitmq.port=5672
rabbitmq.userName=guest
rabbitmq.password=guest
rabbitmq.vhost=/
rabbitmq.exchangeType=direct
rabbitmq.durable=true
rabbitmq.autoAck=false
rabbitmq.basicQos=true

Define Message that will be used by the Queue (just a simple POJO)

public class SampleMessage implements Serializable {

    /** The field1. */
    private String field1;

    /** The field2. */
    private String field2;

    /**
     * Instantiates a new sample message.
     */
    public SampleMessage() {

    }

    /**
     * Instantiates a new sample message.
     *
     * @param field1 the field1
     * @param field2 the field2
     */
    public SampleMessage(String field1, String field2) {
        super();
        this.field1 = field1;
        this.field2 = field2;
    }

    /**
     * Gets the field1.
     *
     * @return the field1
     */
    public String getField1() {
        return field1;
    }

    /**
     * Sets the field1.
     *
     * @param field1 the new field1
     */
    public void setField1(String field1) {
        this.field1 = field1;
    }

    /**
     * Gets the field2.
     *
     * @return the field2
     */
    public String getField2() {
        return field2;
    }

    /**
     * Sets the field2.
     *
     * @param field2 the new field2
     */
    public void setField2(String field2) {
        this.field2 = field2;
    }

    /**
     * To String
     *
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString() {
        return "SampleMessage [field1=" + field1 + ", field2=" + field2 + "]";
    }
}

Publish a Message

public static void publish(String q) {
     RabbitMQPublisher.publish("myQueue", new SampleMessage(q, q));
     render(q);
    }

Creating a Message Consumer

@OnApplicationStart(async=true)
public class RabbitMQSampleConsumer extends RabbitMQConsumer {

    /**
     * Consume Message
     *
     * @see play.modules.rabbitmq.consumer.RabbitMQConsumer#consume(T)
     */
    @Override
    protected void consume(SampleMessage message) {
        System.out.println("******************************");
        System.out.println("* Message Consumed: " + message);
        System.out.println("******************************");
    }

    /**
     * Name of the Queue that this consumer will be listening to.
     *
     * @return the string
     * @see play.modules.rabbitmq.consumer.RabbitMQConsumer#queue()
     */
    @Override
    protected String queue() {
        return "myQueue";
    }

    /**
     * Return message type.
     *
     * @return the message type
     * @see play.modules.rabbitmq.consumer.RabbitMQConsumer#getMessageType()
     */
    protected Class getMessageType() {
        return SampleMessage.class;
    }
}

* Please note this is a Play! job so you can start it manualy or you can use the other annotations provided by Play! like @On or @Every. More information available at Asynchronous Jobs documentation.

Firehose – Another way to publish messages in batch

@OnApplicationStart(async = true)
public class RabbitMQSampleFirehose extends RabbitMQFirehose {

    /** The count. */
    public int count = 0;

    /**
     * Get data to be loaded.
     *
     * @param n the n
     * @return the data
     * @throws Exception the exception
     * @see play.modules.rabbitmq.producer.RabbitMQFirehose#getData(int)
     */
    @Override
    protected List getData(int n) throws Exception {
        if ( count >= 10 ) {
            return null;
        }
        List results = new ArrayList();
        for (int i = 0; i < n; i++) {
            results.add(new SampleMessage("field1", "field2"));
            count++;
        }
        return results;
    }

    /**
     * Batch Size - How many records we will select at the time?.
     *
     * @return the int
     * @see play.modules.rabbitmq.producer.RabbitMQFirehose#batchSize()
     */
    @Override
    protected int batchSize() {
        return 2;
    }

    /**
     * Queue Name.
     *
     * @return the string
     * @see play.modules.rabbitmq.producer.RabbitMQFirehose#queueName()
     */
    @Override
    protected String queueName() {
        return "myQueue";
    }

}

* Please note this is a Play! job so you can start it manualy or you can use the other annotations provided by Play! like @On or @Every. More information available at Asynchronous Jobs documentation. Of course the code is available on Github.

Now Go Play!

Reference : RabbitMQ Module for Play! Framework from our JCG partner Felipe Oliveira at Geeks Are Totally In.

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