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REDNACO Commons and Utils for Java.

There is a newer version: 3.0.2

/*
 * 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 io.github.matteobertozzi.rednaco.threading;

import java.util.concurrent.atomic.AtomicBoolean;

import io.github.matteobertozzi.easerinsights.logging.Logger;
import io.github.matteobertozzi.easerinsights.tracing.Span;
import io.github.matteobertozzi.easerinsights.tracing.Tracer;
import io.github.matteobertozzi.rednaco.strings.HumansUtil;

public final class ShutdownUtil {
  private static final NamedThreadFactory threadFactory = new NamedThreadFactory("ShutdownHook");

  private ShutdownUtil() {
    // no-op
  }

  public interface StopSignal {
    boolean sendStopSignal();
  }

  public static void addShutdownHook(final String name, final StopSignal... services) {
    addShutdownHook(name, Thread.currentThread(), services);
  }

  public static void addShutdownHook(final String name, final Thread mainThread, final StopSignal... services) {
    addShutdownHook(name, mainThread, new AtomicBoolean(true), services);
  }

  public static void addShutdownHook(final String name, final AtomicBoolean running, final StopSignal... services) {
    addShutdownHook(name, Thread.currentThread(), running, services);
  }

  public static void addShutdownHook(final String name, final Thread mainThread, final AtomicBoolean running, final StopSignal... services) {
    Runtime.getRuntime().addShutdownHook(threadFactory.newThread(() -> {
      try (Span span = Tracer.newRootSpan()) {
        span.setName("Shutdown Hook");

        final long startTime = System.nanoTime();
        Logger.info("{} shutdown hook!", name);
        for (int i = 0; i < services.length; ++i) {
          services[i].sendStopSignal();
        }
        running.set(false);
        Logger.debug("waiting for {} to finish", mainThread);
        ThreadUtil.shutdown(mainThread);
        Logger.info("shutdown took: {}", HumansUtil.humanTimeSince(startTime));
      }
    }));
  }
}