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Camel HazelCast based work queue implementation
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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
package org.apache.camel.component.hazelcast.queue;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.TimeUnit;

import com.hazelcast.collection.IQueue;
import com.hazelcast.core.HazelcastInstance;
import org.apache.camel.Endpoint;
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.component.hazelcast.HazelcastDefaultConsumer;
import org.apache.camel.component.hazelcast.listener.CamelItemListener;

public class HazelcastQueueConsumer extends HazelcastDefaultConsumer {

    private final Processor processor;
    private ExecutorService executor;
    private QueueConsumerTask queueConsumerTask;
    private HazelcastQueueConfiguration config;

    public HazelcastQueueConsumer(HazelcastInstance hazelcastInstance, Endpoint endpoint, Processor processor, String cacheName,
                                  final HazelcastQueueConfiguration configuration) {
        super(hazelcastInstance, endpoint, processor, cacheName);
        this.processor = processor;
        this.config = configuration;
    }

    @Override
    protected void doStart() throws Exception {
        super.doStart();
        executor = ((HazelcastQueueEndpoint) getEndpoint()).createExecutor();

        CamelItemListener camelItemListener = new CamelItemListener(this, cacheName);
        queueConsumerTask = new QueueConsumerTask(camelItemListener);
        executor.submit(queueConsumerTask);
    }

    @Override
    protected void doStop() throws Exception {
        super.doStop();

        if (executor != null) {
            if (getEndpoint() != null && getEndpoint().getCamelContext() != null) {
                getEndpoint().getCamelContext().getExecutorServiceManager().shutdownNow(executor);
            } else {
                executor.shutdownNow();
            }
        }
        executor = null;
    }

    class QueueConsumerTask implements Runnable {

        CamelItemListener camelItemListener;

        public QueueConsumerTask(CamelItemListener camelItemListener) {
            this.camelItemListener = camelItemListener;
        }

        @Override
        public void run() {
            IQueue