com.esri.geoevent.transport.rabbitmq.RabbitMQQueueingConsumer.java Source code

Introduction

Here is the source code for com.esri.geoevent.transport.rabbitmq.RabbitMQQueueingConsumer.java

Source

/*
  Copyright 1995-2015 Esri
    
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
    
   http://www.apache.org/licenses/LICENSE-2.0
    
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
    
  For additional information, contact:
  Environmental Systems Research Institute, Inc.
  Attn: Contracts Dept
  380 New York Street
  Redlands, California, USA 92373
    
  email: contracts@esri.com
*/

package com.esri.geoevent.transport.rabbitmq;

import java.io.IOException;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;

import com.rabbitmq.client.AMQP;
import com.rabbitmq.client.BasicProperties;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Consumer;
import com.rabbitmq.client.ConsumerCancelledException;
import com.rabbitmq.client.Envelope;
import com.rabbitmq.client.ShutdownSignalException;

public class RabbitMQQueueingConsumer implements Consumer {
    private final Channel channel;
    private volatile String consumerTag;
    private final BlockingQueue<Delivery> queue = new LinkedBlockingQueue<Delivery>();

    public RabbitMQQueueingConsumer(Channel channel) {
        this.channel = channel;
    }

    public Channel getChannel() {
        return channel;
    }

    public String getConsumerTag() {
        return consumerTag;
    }

    @Override
    public void handleShutdownSignal(String consumerTag, ShutdownSignalException shutdownSignal) {
        // ignore
    }

    @Override
    public void handleCancel(String consumerTag) throws IOException {
        // ignore
    }

    @Override
    public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body)
            throws IOException {
        queue.add(new Delivery(envelope, properties, body));
    }

    public Delivery nextDelivery()
            throws InterruptedException, ShutdownSignalException, ConsumerCancelledException {
        return queue.take();
    }

    public Delivery nextDelivery(long timeout)
            throws InterruptedException, ShutdownSignalException, ConsumerCancelledException {
        return queue.poll(timeout, TimeUnit.MILLISECONDS);
    }

    @Override
    public void handleConsumeOk(String consumerTag) {
        this.consumerTag = consumerTag;
    }

    @Override
    public void handleCancelOk(String consumerTag) {
        // ignore
    }

    @Override
    public void handleRecoverOk(String consumerTag) {
        // ignore
    }

    public static class Delivery {
        private final Envelope envelope;
        private final AMQP.BasicProperties properties;
        private final byte[] body;

        public Delivery(Envelope envelope, AMQP.BasicProperties properties, byte[] body) {
            this.envelope = envelope;
            this.properties = properties;
            this.body = body;
        }

        public Envelope getEnvelope() {
            return envelope;
        }

        public BasicProperties getProperties() {
            return properties;
        }

        public byte[] getBody() {
            return body;
        }
    }
}