org.apache.ambari.servicemonitor.utils.KillHungProcess.java Source code

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Here is the source code for org.apache.ambari.servicemonitor.utils.KillHungProcess.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.ambari.servicemonitor.utils;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

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

/**
 * Kill a hung process.
 * This schedules a thread on startup; the class is 
 */
public final class KillHungProcess implements Runnable {
    private static final Log LOG = LogFactory.getLog(KillHungProcess.class);

    private ScheduledFuture<?> future;
    private final String exitText;
    private final int timeoutMilliseconds;

    public KillHungProcess(int timeoutMilliseconds, String exitText) {
        this.timeoutMilliseconds = timeoutMilliseconds;
        this.exitText = exitText;
    }

    public void start() {
        ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
        future = scheduler.schedule(this, this.timeoutMilliseconds, TimeUnit.MILLISECONDS);
    }

    public void cancel() {
        if (future != null) {
            future.cancel(false);
        }
    }

    @Override
    public void run() {
        LOG.warn(exitText);
        Exit.exitProcess(false);
    }
}