/**
    * Logback: the reliable, generic, fast and flexible logging framework. Copyright (C) 1999-2015, QOS.ch. All rights
    * reserved.
    *
    * This program and the accompanying materials are dual-licensed under either the terms of the Eclipse Public License
    * v1.0 as published by the Eclipse Foundation
    *
    * or (per the licensee's choosing)
    *
   * under the terms of the GNU Lesser General Public License version 2.1 as published by the Free Software Foundation.
   */
  package ch.qos.logback.core.util;
  
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  import java.util.concurrent.ScheduledExecutorService;
  import java.util.concurrent.ScheduledThreadPoolExecutor;
  import java.util.concurrent.SynchronousQueue;
  import java.util.concurrent.ThreadFactory;
  import java.util.concurrent.ThreadPoolExecutor;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import ch.qos.logback.core.CoreConstants;
  
  /**
   * Static utility methods for manipulating an {@link ExecutorService}.
   *
   * @author Carl Harris
   * @author Mikhail Mazursky
   */
  public class ExecutorServiceUtil {
  
      private static final ThreadFactory THREAD_FACTORY_FOR_SCHEDULED_EXECUTION_SERVICE = new ThreadFactory() {
  
          private final AtomicInteger threadNumber = new AtomicInteger(1);
  
          private final ThreadFactory defaultFactory = makeThreadFactory();
  
          /**
           * A thread factory which may be a virtual thread factory the JDK supports it.
           *
           * @return
           */
          private ThreadFactory makeThreadFactory() {
              return Executors.defaultThreadFactory();
          }
  
          @Override
          public Thread newThread(Runnable r) {
              Thread thread = defaultFactory.newThread(r);
              if (!thread.isDaemon()) {
                  thread.setDaemon(true);
              }
              thread.setName("logback-" + threadNumber.getAndIncrement());
              return thread;
          }
      };
  
      static public ScheduledExecutorService newScheduledExecutorService() {
          return new ScheduledThreadPoolExecutor(CoreConstants.SCHEDULED_EXECUTOR_POOL_SIZE,
                  THREAD_FACTORY_FOR_SCHEDULED_EXECUTION_SERVICE);
      }
  
      /**
       * @deprecated replaced by {@link #newThreadPoolExecutor()}
       */
      static public ExecutorService newExecutorService() {
          return newThreadPoolExecutor();
      }
  
      /**
       * Creates an ThreadPoolExecutor suitable for use by logback components.
       *
       * @since 1.4.7
       * @return ThreadPoolExecutor
       */
      static public ThreadPoolExecutor newThreadPoolExecutor() {
          return new ThreadPoolExecutor(CoreConstants.CORE_POOL_SIZE, CoreConstants.MAX_POOL_SIZE, 0L,
                  TimeUnit.MILLISECONDS, new SynchronousQueue<Runnable>(),
                  THREAD_FACTORY_FOR_SCHEDULED_EXECUTION_SERVICE);
      }
  
      /**
       * Shuts down an executor service.
       * <p>
       *
       * @param executorService the executor service to shut down
       */
      static public void shutdown(ExecutorService executorService) {
          if (executorService != null) {
              executorService.shutdownNow();
          }
      }
  
      /**
       * An alternate implementation of {@linl #newThreadPoolExecutor} which returns a virtual thread per task executor when
      * available.
      *
      * @since 1.3.12/1.4.12
      */
     static public ExecutorService newAlternateThreadPoolExecutor() {
         return newThreadPoolExecutor();
     }
 }