com.github.kagkarlsson.scheduler.ExecutorUtils Maven / Gradle / Ivy

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Simple persistent scheduler for scheduled tasks, recurring or ad-hoc.

There is a newer version: 15.0.0

/*
 * Copyright (C) Gustav Karlsson
 *
 * 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 com.github.kagkarlsson.scheduler;

import java.time.Duration;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ExecutorUtils {

  private static final Logger LOG = LoggerFactory.getLogger(ExecutorUtils.class);

  public static boolean shutdownAndAwaitTermination(
      ExecutorService executorService, Duration waitBeforeInterrupt, Duration waitAfterInterrupt) {
    executorService.shutdown();
    boolean successfulShutdown = awaitTermination(executorService, waitBeforeInterrupt);
    if (!successfulShutdown) {
      LOG.info("Interrupting executor service threads for shutdown.");
      executorService.shutdownNow();
      return awaitTermination(executorService, waitAfterInterrupt);
    } else {
      return true;
    }
  }

  public static boolean awaitTermination(ExecutorService executor, Duration timeout) {
    try {
      return executor.awaitTermination(timeout.toMillis(), TimeUnit.MILLISECONDS);
    } catch (InterruptedException e) {
      LOG.warn("Interrupted while waiting for termination of executor.", e);
      return false;
    }
  }

  public static ThreadFactory defaultThreadFactoryWithPrefix(String prefix) {
    return new PrefixingDefaultThreadFactory(prefix);
  }

  private static class PrefixingDefaultThreadFactory implements ThreadFactory {

    private final String prefix;
    private final ThreadFactory defaultThreadFactory;

    public PrefixingDefaultThreadFactory(String prefix) {
      this.defaultThreadFactory = Executors.defaultThreadFactory();
      this.prefix = prefix;
    }

    @Override
    public Thread newThread(Runnable r) {
      final Thread thread = defaultThreadFactory.newThread(r);
      thread.setName(prefix + thread.getName());
      return thread;
    }
  }
}