text: /*
   * 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 org.apache.tomee.jul.handler.rotating;
  
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  import java.util.concurrent.ThreadFactory;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicInteger;
  import java.util.logging.LogManager;
  
  // Note: don't touch this class while not needed to avoid to trigger the executor service init
  // mainly there to avoid all handlers to have their own threads
  class BackgroundTaskRunner {
      private static final ExecutorService EXECUTOR_SERVICE;
      private static final boolean SYNCHRONOUS;
  
      static {
          final LogManager logManager = LogManager.getLogManager();
          SYNCHRONOUS = Boolean.parseBoolean(getProperty(logManager, BackgroundTaskRunner.class.getName() + ".synchronous"));
          if (SYNCHRONOUS) {
              EXECUTOR_SERVICE = null;
          } else {
  
              final String threadCount = getProperty(logManager, BackgroundTaskRunner.class.getName() + ".threads");
              final String shutdownTimeoutStr = getProperty(logManager, BackgroundTaskRunner.class.getName() + ".shutdownTimeout");
              final Duration shutdownTimeout = new Duration(shutdownTimeoutStr == null ? "30 seconds" : shutdownTimeoutStr);
              EXECUTOR_SERVICE = Executors.newFixedThreadPool(Integer.parseInt(threadCount == null ? "2" : threadCount), new ThreadFactory() {
                  private final ThreadGroup group;
                  private final AtomicInteger threadNumber = new AtomicInteger(1);
                  private final String namePrefix = "org.apache.tomee.jul.handler.rotating.BackgroundTaskRunner-";
  
                  {
                      final SecurityManager s = System.getSecurityManager();
                      group = (s != null) ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
                  }
  
                  @Override
                  public Thread newThread(final Runnable r) {
                      final Thread t = new Thread(group, r, namePrefix + threadNumber.getAndIncrement(), 0);
                      if (!t.isDaemon()) {
                          t.setDaemon(true);
                      }
                      if (t.getPriority() != Thread.NORM_PRIORITY) {
                          t.setPriority(Thread.NORM_PRIORITY);
                      }
                      return t;
                  }
              });
  
              Runtime.getRuntime().addShutdownHook(new Thread() {
                  @Override
                  public void run() {
                      EXECUTOR_SERVICE.shutdown();
                      try {
                          EXECUTOR_SERVICE.awaitTermination(shutdownTimeout.asMillis(), TimeUnit.MILLISECONDS);
                      } catch (final InterruptedException e) {
                          Thread.interrupted();
                      }
                  }
              });
          }
      }
  
      private static String getProperty(final LogManager logManager, final String key) {
          final String val = logManager.getProperty(key);
          return val != null ? val : System.getProperty(key);
      }
  
      static void push(final Runnable runnable) {
          if (SYNCHRONOUS) {
              runnable.run();
          } else {
              EXECUTOR_SERVICE.submit(runnable);
          }
      }
  }
  