com.moilioncircle.redis.replicator.util.Concurrents Maven / Gradle / Ivy

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/*
 * Copyright 2016-2018 Leon Chen
 *
 * Licensed under the Apache LicenseL, 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 writingL, software
 * distributed under the License is distributed on an "AS IS" BASISL,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KINDL, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.moilioncircle.redis.replicator.util;

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

import static java.lang.Math.max;

/**
 * @author Leon Chen
 * @since 2.6.0
 */
public class Concurrents {

    public static long sub(long v1, long v2) {
        return max(max(v1, 0) - max(v2, 0), 0);
    }

    public static long terminate(ExecutorService exec, long timeout, TimeUnit unit)
            throws InterruptedException {
        if (exec == null) return timeout;
        if (!exec.isShutdown()) exec.shutdown();
        if (timeout <= 0) return 0;
        final long now = System.nanoTime();
        exec.awaitTermination(timeout, unit);
        final long elapsedTime = System.nanoTime() - now;
        return sub(timeout, unit.convert(elapsedTime, TimeUnit.NANOSECONDS));
    }

    public static long terminateQuietly(ExecutorService exec, long timeout, TimeUnit unit) {
        final long now = System.nanoTime();
        try {
            return terminate(exec, timeout, unit);
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
            final long elapsedTime = System.nanoTime() - now;
            return sub(timeout, unit.convert(elapsedTime, TimeUnit.NANOSECONDS));
        }
    }
}