SchedulerService.java

/*
 * Copyright (c) 2015 Dell Inc. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */
package org.opendaylight.tsdr.spi.scheduler;


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

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * This class provides scheduling service to schedule a Task either
 * immediately or with a delay.
 *
 * @author <a href="mailto:yuling_c@dell.com">YuLing Chen</a>
 *
 * Created: May 4th, 2015
 */
public class SchedulerService {

    private static final int ThreadsCount = 10;
    private static SchedulerService schedulerService;
    private static final Logger log = LoggerFactory.getLogger(SchedulerService.class);
    private ScheduledExecutorService scheduler = null;
    private SchedulerService(){
        scheduler = Executors.newScheduledThreadPool(ThreadsCount);
        log.debug("Scheduler Service created the Thread Pool with Threads {}\n" , ThreadsCount);
    }

    public  synchronized  static SchedulerService getInstance(){
        if(schedulerService==null){
            schedulerService = new SchedulerService();
        }
        return schedulerService;
    }
    public ScheduledFuture scheduleTask(Task task){
        return scheduleTask(task,0L);
    }

    public ScheduledFuture scheduleTaskAtFixedRate(Task task, long initialDelay, long retryInterval){
        final ScheduledFuture<?> scheduledFuture = scheduler.scheduleAtFixedRate(task, initialDelay, retryInterval, TimeUnit.SECONDS);
        task.setScheduledFuture(scheduledFuture);
        return scheduledFuture;
    }

    public ScheduledFuture scheduleTask(Task task, long delay){
        final ScheduledFuture<?> scheduledFuture = scheduler.schedule(task, delay, TimeUnit.SECONDS);
        task.setScheduledFuture(scheduledFuture);
        return scheduledFuture;
    }
}