com.alibaba.rocketmq.client.impl.consumer.PullMessageService Maven / Gradle / Ivy

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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 com.alibaba.rocketmq.client.impl.consumer;

import com.alibaba.rocketmq.client.impl.factory.MQClientInstance;
import com.alibaba.rocketmq.client.log.ClientLogger;
import com.alibaba.rocketmq.common.ServiceThread;
import org.slf4j.Logger;

import java.util.concurrent.*;


/**
 * @author shijia.wxr
 */
public class PullMessageService extends ServiceThread {
    private final Logger log = ClientLogger.getLog();
    private final LinkedBlockingQueue pullRequestQueue = new LinkedBlockingQueue();
    private final MQClientInstance mQClientFactory;
    private final ScheduledExecutorService scheduledExecutorService = Executors
            .newSingleThreadScheduledExecutor(new ThreadFactory() {
                @Override
                public Thread newThread(Runnable r) {
                    return new Thread(r, "PullMessageServiceScheduledThread");
                }
            });
    ;


    public PullMessageService(MQClientInstance mQClientFactory) {
        this.mQClientFactory = mQClientFactory;
    }

    public void executePullRequestLater(final PullRequest pullRequest, final long timeDelay) {
        this.scheduledExecutorService.schedule(new Runnable() {

            @Override
            public void run() {
                PullMessageService.this.executePullRequestImmediately(pullRequest);
            }
        }, timeDelay, TimeUnit.MILLISECONDS);
    }

    public void executePullRequestImmediately(final PullRequest pullRequest) {
        try {
            this.pullRequestQueue.put(pullRequest);
        } catch (InterruptedException e) {
            log.error("executePullRequestImmediately pullRequestQueue.put", e);
        }
    }

    public void executeTaskLater(final Runnable r, final long timeDelay) {
        this.scheduledExecutorService.schedule(r, timeDelay, TimeUnit.MILLISECONDS);
    }

    public ScheduledExecutorService getScheduledExecutorService() {
        return scheduledExecutorService;
    }

    private void pullMessage(final PullRequest pullRequest) {
        final MQConsumerInner consumer = this.mQClientFactory.selectConsumer(pullRequest.getConsumerGroup());
        if (consumer != null) {
            DefaultMQPushConsumerImpl impl = (DefaultMQPushConsumerImpl) consumer;
            impl.pullMessage(pullRequest);
        } else {
            log.warn("No matched consumer for the PullRequest {}, drop it", pullRequest);
        }
    }


    @Override
    public void run() {
        log.info(this.getServiceName() + " service started");

        while (!this.isStoped()) {
            try {
                PullRequest pullRequest = this.pullRequestQueue.take();
                if (pullRequest != null) {
                    this.pullMessage(pullRequest);
                }
            } catch (InterruptedException e) {
            } catch (Exception e) {
                log.error("Pull Message Service Run Method exception", e);
            }
        }

        log.info(this.getServiceName() + " service end");
    }


    @Override
    public String getServiceName() {
        return PullMessageService.class.getSimpleName();
    }


}