package org.apache.maven.surefire.junitcore;
   
   /*
    * 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.Collections;
  import java.util.List;
  import java.util.TreeSet;
  import java.util.concurrent.Future;
  import java.util.concurrent.TimeUnit;
  
  import org.apache.maven.surefire.common.junit4.JUnit4RunListener;
  import org.apache.maven.surefire.junitcore.pc.ParallelComputer;
  import org.apache.maven.surefire.testset.TestSetFailedException;
  import org.apache.maven.surefire.util.TestsToRun;
  
  import org.junit.runner.Computer;
  import org.junit.runner.Description;
  import org.junit.runner.JUnitCore;
  import org.junit.runner.Request;
  import org.junit.runner.Result;
  import org.junit.runner.Runner;
  import org.junit.runner.manipulation.Filter;
  import org.junit.runner.manipulation.NoTestsRemainException;
  import org.junit.runner.notification.RunListener;
  
  /**
   * Encapsulates access to JUnitCore
   *
   * @author Kristian Rosenvold
   */
  
  class JUnitCoreWrapper
  {
      private static class FilteringRequest
          extends Request
      {
          private Runner filteredRunner;
  
          public FilteringRequest( Request req, Filter filter )
          {
              try
              {
                  Runner runner = req.getRunner();
                  filter.apply( runner );
                  filteredRunner = runner;
              }
              catch ( NoTestsRemainException e )
              {
                  filteredRunner = null;
              }
          }
  
          @Override
          public Runner getRunner()
          {
              return filteredRunner;
          }
      }
  
      public static void execute( TestsToRun testsToRun, JUnitCoreParameters jUnitCoreParameters,
                                  List<RunListener> listeners, Filter filter )
          throws TestSetFailedException
      {
          ComputerWrapper computerWrapper = createComputer( jUnitCoreParameters );
          JUnitCore junitCore = createJUnitCore( listeners );
          if ( testsToRun.allowEagerReading() )
          {
              executeEager( testsToRun, filter, computerWrapper.getComputer(), junitCore );
          }
          else
          {
              exeuteLazy( testsToRun, filter, computerWrapper.getComputer(), junitCore );
          }
  
          String timeoutMessage = computerWrapper.describeElapsedTimeout();
          if ( timeoutMessage.length() != 0 )
          {
              throw new TestSetFailedException( timeoutMessage );
          }
      }
  
     private static JUnitCore createJUnitCore( List<RunListener> listeners )
     {
         JUnitCore junitCore = new JUnitCore();
         for ( RunListener runListener : listeners )
         {
             junitCore.addListener( runListener );
         }
         return junitCore;
     }
 
     private static void executeEager(TestsToRun testsToRun, Filter filter, Computer computer, JUnitCore junitCore)
             throws TestSetFailedException 
     {
         Class[] tests = testsToRun.getLocatedClasses();
         createRequestAndRun( filter, computer, junitCore, tests );
     }
 
     private static void exeuteLazy(TestsToRun testsToRun, Filter filter, Computer computer, JUnitCore junitCore)
             throws TestSetFailedException
     {
         // in order to support LazyTestsToRun, the iterator must be used
         for ( Class clazz : testsToRun )
         {
             createRequestAndRun( filter, computer, junitCore, clazz );
         }
     }
 
     private static void createRequestAndRun( Filter filter, Computer computer, JUnitCore junitCore, Class<?>... classesToRun )
             throws TestSetFailedException
     {
         Request req = Request.classes( computer, classesToRun );
         if ( filter != null )
         {
             req = new FilteringRequest( req, filter );
             if ( req.getRunner() == null )
             {
                 // nothing to run
                 return;
             }
         }
 
         final Result run = junitCore.run( req );
         JUnit4RunListener.rethrowAnyTestMechanismFailures( run );
     }
 
     private static ComputerWrapper createComputer( JUnitCoreParameters parameters )
         throws TestSetFailedException
     {
         return parameters.isNoThreading() ? new ComputerWrapper( Computer.serial() ) : createParallelComputer( parameters );
     }
 
     private static ComputerWrapper createParallelComputer( JUnitCoreParameters parameters )
             throws TestSetFailedException
     {
         ParallelComputer pc = ParallelComputerFactory.createParallelComputer( parameters );
 
         int timeout = parameters.getParallelTestsTimeoutInSeconds();
 
         int timeoutForced = parameters.getParallelTestsTimeoutForcedInSeconds();
 
         Future<Collection<Description>> testsBeforeShutdown =
                 timeout > 0 ? pc.scheduleShutdown( timeout, TimeUnit.SECONDS ) : null;
 
         Future<Collection<Description>> testsBeforeForcedShutdown =
                 timeoutForced > 0 ? pc.scheduleForcedShutdown( timeoutForced, TimeUnit.SECONDS ) : null;
 
         return new ComputerWrapper( pc, timeout, testsBeforeShutdown, timeoutForced, testsBeforeForcedShutdown );
     }
 
     private static class ComputerWrapper
     {
         private final Computer computer;
         private final int timeout;
         private final int timeoutForced;
         private final Future<Collection<Description>> testsBeforeShutdown;
         private final Future<Collection<Description>> testsBeforeForcedShutdown;
 
         ComputerWrapper( Computer computer )
         {
             this( computer, 0, null, 0, null );
         }
 
         ComputerWrapper( Computer computer,
                          int timeout, Future<Collection<Description>> testsBeforeShutdown,
                          int timeoutForced, Future<Collection<Description>> testsBeforeForcedShutdown )
         {
             this.computer = computer;
             this.timeout = timeout;
             this.testsBeforeShutdown = testsBeforeShutdown;
             this.timeoutForced = timeoutForced;
             this.testsBeforeForcedShutdown = testsBeforeForcedShutdown;
         }
 
         Computer getComputer()
         {
             return computer;
         }
 
         String describeElapsedTimeout() throws TestSetFailedException
         {
             TreeSet<String> executedTests = new TreeSet<String>();
             if ( timeout > 0 )
             {
                 executedTests.addAll( printShutdownHook( testsBeforeShutdown ) );
             }
 
             if ( timeoutForced > 0 )
             {
                 executedTests.addAll( printShutdownHook( testsBeforeForcedShutdown ) );
             }
 
             StringBuilder msg = new StringBuilder();
             if ( !executedTests.isEmpty() )
             {
                 msg.append( "The test run has finished abruptly after timeout of " );
                 msg.append( Math.min( timeout, timeoutForced ) );
                 msg.append( " seconds.\n" );
                 msg.append( "These tests were executed in prior of the shutdown operation:\n" );
                 for ( String executedTest : executedTests )
                 {
                     msg.append( executedTest ).append( "\n" );
                 }
             }
             return msg.toString();
         }
 
         static Collection<String> printShutdownHook( Future<Collection<Description>> future )
                 throws TestSetFailedException
         {
             if ( !future.isCancelled() && future.isDone() )
             {
                 try
                 {
                     TreeSet<String> executedTests = new TreeSet<String>();
                     for ( Description executedTest : future.get() )
                     {
                         if ( executedTest != null && executedTest.getDisplayName() != null )
                         {
                             executedTests.add( executedTest.getDisplayName() );
                         }
                     }
                     return executedTests;
                 }
                 catch ( Exception e )
                 {
                     throw new TestSetFailedException( e );
                 }
             }
             return Collections.emptySet();
         }
     }
 }