io.uploader.drive.util.ThreadUtils.java Source code

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Here is the source code for io.uploader.drive.util.ThreadUtils.java

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/*
 * Copyright 2014 Loic Merckel
 * 
 * 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 io.uploader.drive.util;

import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.TimeUnit;

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

import com.google.common.base.Preconditions;

public class ThreadUtils {

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

    private ThreadUtils() {
        super();
        throw new IllegalStateException();
    }

    public static void shutdownExecutor(ExecutorService executor) {
        Preconditions.checkNotNull(executor);
        logger.info("Shutdown executors");
        executor.shutdown();
        try {
            executor.awaitTermination(2, TimeUnit.SECONDS);
        } catch (InterruptedException e) {
            logger.error("Error occurred while awaiting threads termination", e);
        }
        List<Runnable> notStarted = executor.shutdownNow();
        if (!notStarted.isEmpty()) {
            logger.info("Unstarted tasks stopped (" + notStarted.size() + " tasks in total)");
        }
    }
}