package org.apache.maven.surefire.junitplatform;
   
   /*
    * 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 org.apache.maven.surefire.api.util.ReflectionUtils;
  import org.junit.platform.launcher.Launcher;
  import org.junit.platform.launcher.LauncherDiscoveryRequest;
  import org.junit.platform.launcher.TestExecutionListener;
  import org.junit.platform.launcher.TestPlan;
  import org.junit.platform.launcher.core.LauncherFactory;
  
  /**
   * Launcher proxy which delays the most possible the initialization of the real JUnit
   * Launcher in order to avoid stream/stdout corruption due to early logging.
   */
  class LazyLauncher implements Launcher, AutoCloseable
  {
      private AutoCloseable launcherSession;
  
      private Launcher launcher;
  
      @Override
      public void registerTestExecutionListeners( TestExecutionListener... testExecutionListeners )
      {
          launcher().registerTestExecutionListeners( testExecutionListeners );
      }
  
      @Override
      public TestPlan discover( LauncherDiscoveryRequest launcherDiscoveryRequest )
      {
          return launcher().discover( launcherDiscoveryRequest );
      }
  
      @Override
      public void execute( LauncherDiscoveryRequest launcherDiscoveryRequest,
                           TestExecutionListener... testExecutionListeners )
      {
          launcher().execute( launcherDiscoveryRequest, testExecutionListeners );
      }
  
      private Launcher launcher()
      {
          if ( launcher == null )
          {
              try
              {
                  Class<?> sessionClass = Class.forName( "org.junit.platform.launcher.LauncherSession" );
                  launcherSession = ReflectionUtils.invokeGetter( LauncherFactory.class, null, "openSession" ); 
                  launcher = ReflectionUtils.invokeGetter( sessionClass, launcherSession, "getLauncher" );
              }
              catch ( ClassNotFoundException e )
              {
                  launcher = LauncherFactory.create();
              }
          }
          return launcher;
      }
  
      @Override
      public void close() throws Exception
      {
          if ( launcherSession != null )
          {
              launcherSession.close();
              launcherSession = null;
          }
          launcher = null;
      }
  }