co.cask.cdap.internal.app.runtime.schedule.DistributedSchedulerService.java Source code

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Here is the source code for co.cask.cdap.internal.app.runtime.schedule.DistributedSchedulerService.java

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/*
 * Copyright  2014 Cask Data, Inc.
 *
 * 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 co.cask.cdap.internal.app.runtime.schedule;

import co.cask.cdap.app.store.Store;
import co.cask.cdap.common.conf.CConfiguration;
import co.cask.cdap.common.service.RetryOnStartFailureService;
import co.cask.cdap.common.service.RetryStrategies;
import com.google.common.base.Supplier;
import com.google.common.util.concurrent.AbstractService;
import com.google.common.util.concurrent.Service;
import com.google.inject.Inject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.TimeUnit;

/**
 * Scheduler service to run in Distributed CDAP. Waits for Dataset service to be available.
 */
public final class DistributedSchedulerService extends AbstractSchedulerService {

    private static final Logger LOG = LoggerFactory.getLogger(DistributedSchedulerService.class);
    private final Service serviceDelegate;

    @Inject
    public DistributedSchedulerService(TimeScheduler timeScheduler, StreamSizeScheduler streamSizeScheduler,
            CConfiguration cConf, Store store) {
        super(timeScheduler, streamSizeScheduler, cConf, store);
        this.serviceDelegate = new RetryOnStartFailureService(new Supplier<Service>() {
            @Override
            public Service get() {
                return new AbstractService() {
                    @Override
                    protected void doStart() {
                        try {
                            startSchedulers();
                            notifyStarted();
                        } catch (SchedulerException e) {
                            notifyFailed(e);
                        }
                    }

                    @Override
                    protected void doStop() {
                        try {
                            stopScheduler();
                            notifyStopped();
                        } catch (SchedulerException e) {
                            notifyFailed(e);
                        }
                    }
                };
            }
        }, RetryStrategies.exponentialDelay(200, 5000, TimeUnit.MILLISECONDS));
    }

    @Override
    protected void startUp() throws Exception {
        LOG.info("Starting scheduler.");
        serviceDelegate.startAndWait();
    }

    @Override
    protected void shutDown() throws Exception {
        LOG.info("Stopping scheduler.");
        serviceDelegate.stopAndWait();
    }
}