package org.apache.maven.plugin.surefire.booterclient;
   
   /*
    * 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.plugin.surefire.JdkAttributes;
  import org.apache.maven.surefire.booter.SystemUtils;
  
  import java.util.concurrent.Callable;
  import java.util.concurrent.FutureTask;
  import java.util.concurrent.RunnableFuture;
  
  import static org.apache.maven.surefire.util.internal.DaemonThreadFactory.newDaemonThread;
  
  /**
   * Loads platform specifics.
   *
   * @author <a href="mailto:tibordigana@apache.org">Tibor Digana (tibor17)</a>
   * @since 2.20.1
   */
  public final class Platform
  {
      private final RunnableFuture<Long> pluginPidJob;
  
      private volatile JdkAttributes jdk;
  
      public Platform()
      {
          // the job may take 50 or 80 ms
          this( new FutureTask<>( pidJob() ), null );
          newDaemonThread( pluginPidJob ).start();
      }
  
      private Platform( RunnableFuture<Long> pluginPidJob, JdkAttributes jdk )
      {
          this.pluginPidJob = pluginPidJob;
          this.jdk = jdk;
      }
  
      public Long getPluginPid()
      {
          try
          {
              return pluginPidJob.get();
          }
          catch ( Exception e )
          {
              return null;
          }
      }
  
      public JdkAttributes getJdkExecAttributesForTests()
      {
          return jdk;
      }
  
      public Platform withJdkExecAttributesForTests( JdkAttributes jdk )
      {
          return new Platform( pluginPidJob, jdk );
      }
  
      private static Callable<Long> pidJob()
      {
          return new Callable<Long>()
          {
              @Override
              public Long call() throws Exception
              {
                  return SystemUtils.pid();
              }
          };
      }
  }