/*
    * 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.maven.surefire.junitcore.pc;
  
  import java.util.Queue;
  import java.util.concurrent.ConcurrentLinkedQueue;
  
  import org.apache.maven.plugin.surefire.log.api.ConsoleLogger;
  
  /**
   * The sequentially executing strategy in private package.
   *
   * @author Tibor Digana (tibor17)
   * @see SchedulingStrategy
   * @since 2.16
   */
  final class InvokerStrategy extends SchedulingStrategy {
  
      private final Queue<Thread> activeThreads = new ConcurrentLinkedQueue<>();
  
      protected InvokerStrategy(ConsoleLogger logger) {
          super(logger);
      }
  
      @Override
      public void schedule(Runnable task) {
          if (canSchedule()) {
              final Thread currentThread = Thread.currentThread();
              try {
                  activeThreads.add(currentThread);
                  task.run();
              } finally {
                  activeThreads.remove(currentThread);
              }
          }
      }
  
      @Override
      protected boolean stop() {
          return disable();
      }
  
      @Override
      protected boolean stopNow() {
          final boolean stopped = disable();
  
          for (Thread activeThread = activeThreads.poll(); activeThread != null; activeThread = activeThreads.poll()) {
              activeThread.interrupt();
          }
          return stopped;
      }
  
      @Override
      public boolean hasSharedThreadPool() {
          return false;
      }
  
      @Override
      public boolean finished() throws InterruptedException {
          return disable();
      }
  
      @Override
      public boolean destroy() {
          return stop();
      }
  }