org.nebula.service.core.Heartbeat.java Source code

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Here is the source code for org.nebula.service.core.Heartbeat.java

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/*
 * Copyright 2002-2015 the original author or authors.
 *
 * 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.
 */

package org.nebula.service.core;

import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;

@Service
public class Heartbeat {

    private final static Logger logger = Logger.getLogger(Heartbeat.class);

    private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);

    @Value("${heartbeat.intervalSecs}")
    private int intervalSecs;

    @Autowired
    private HeartbeatDetector heartbeatDetector;

    @PostConstruct
    public void start() throws Exception {

        heartbeatDetector.preProcess();

        scheduler.scheduleWithFixedDelay(heartbeatDetector, 0, intervalSecs, TimeUnit.SECONDS);

        logger.info("Heartbeat started interval " + intervalSecs);
    }

    @PreDestroy
    public void stop() {

        shutdownScheduler();
    }

    private void shutdownScheduler() {
        scheduler.shutdown();
        try {
            scheduler.awaitTermination(10, TimeUnit.SECONDS);
        } catch (InterruptedException e) {
            //ignore the exception
        }
    }

}