package org.apache.maven.surefire.junitcore.pc;

 /*

  * 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.

  */

 import java.util.Collection;

 import java.util.concurrent.ExecutorService;

 import java.util.concurrent.Future;

 import java.util.concurrent.ThreadPoolExecutor;

 import java.util.concurrent.atomic.AtomicBoolean;

 /**

  * Abstract parallel scheduling strategy in private package.

  * The remaining abstract methods have to be implemented differently

  * depending if the thread pool is shared with other strategies or not.

  *

  * @author Tibor Digana (tibor17)

  * @since 2.16

  *

  * @see SchedulingStrategy

  * @see SharedThreadPoolStrategy

  * @see NonSharedThreadPoolStrategy

  */

 abstract class AbstractThreadPoolStrategy extends SchedulingStrategy {

     private final ExecutorService threadPool;

     private final Collection<Future<?>> futureResults;

     private final AtomicBoolean canSchedule = new AtomicBoolean(true);

     AbstractThreadPoolStrategy(ExecutorService threadPool) {

         this(threadPool, null);

     }

     AbstractThreadPoolStrategy(ExecutorService threadPool, Collection<Future<?>> futureResults) {

         this.threadPool = threadPool;

         this.futureResults = futureResults;

     }

     protected final ExecutorService getThreadPool() {

         return threadPool;

     }

     protected final Collection<Future<?>> getFutureResults() {

         return futureResults;

     }

     protected final void disable() {

         canSchedule.set(false);

     }

     @Override

     public void schedule(Runnable task) {

         if (canSchedule()) {

             Future<?> futureResult = threadPool.submit(task);

             if (futureResults != null) {

                 futureResults.add(futureResult);

             }

         }

     }

     @Override

     protected boolean stop() {

         boolean wasRunning = canSchedule.getAndSet(false);

         if (threadPool.isShutdown()) {

             wasRunning = false;

         } else {

             threadPool.shutdown();

         }

         return wasRunning;

     }

     @Override

     protected boolean stopNow() {

         boolean wasRunning = canSchedule.getAndSet(false);

         if (threadPool.isShutdown()) {

             wasRunning = false;

         } else {

             threadPool.shutdownNow();

         }

         return wasRunning;

     }

     @Override

     protected void setDefaultShutdownHandler(Scheduler.ShutdownHandler handler) {

         if (threadPool instanceof ThreadPoolExecutor) {

             ThreadPoolExecutor pool = (ThreadPoolExecutor) threadPool;

             handler.setRejectedExecutionHandler(pool.getRejectedExecutionHandler());

             pool.setRejectedExecutionHandler(handler);

         }

     }

     @Override

     public final boolean canSchedule() {

         return canSchedule.get();

     }

 }