org.apache.slider.server.services.workflow.EndOfServiceWaiter.java Source code

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Here is the source code for org.apache.slider.server.services.workflow.EndOfServiceWaiter.java

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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.slider.server.services.workflow;

import org.apache.hadoop.service.Service;
import org.apache.hadoop.service.ServiceStateChangeListener;
import org.junit.Assert;

import java.util.concurrent.atomic.AtomicBoolean;

/**
 * Wait for a service to stop
 */
public class EndOfServiceWaiter implements ServiceStateChangeListener {

    private final AtomicBoolean finished = new AtomicBoolean(false);

    public EndOfServiceWaiter(Service svc) {
        svc.registerServiceListener(this);
    }

    public synchronized void waitForServiceToStop(long timeout) throws InterruptedException {
        if (!finished.get()) {
            wait(timeout);
        }
        Assert.assertTrue("Service did not finish in time period", finished.get());
    }

    @Override
    public synchronized void stateChanged(Service service) {
        if (service.isInState(Service.STATE.STOPPED)) {
            finished.set(true);
            notify();
        }
    }

}