package org.junit.internal.requests;
   
   import org.junit.internal.builders.AllDefaultPossibilitiesBuilder;
   import org.junit.runner.Request;
   import org.junit.runner.Runner;
   
   public class ClassRequest extends Request {
       private final Object runnerLock = new Object();
   
      /*
       * We have to use the f prefix, because IntelliJ's JUnit4IdeaTestRunner uses
       * reflection to access this field. See
       * https://github.com/junit-team/junit/issues/960
       */
      private final Class<?> fTestClass;
      private final boolean canUseSuiteMethod;
      private volatile Runner runner;
  
      public ClassRequest(Class<?> testClass, boolean canUseSuiteMethod) {
          this.fTestClass = testClass;
          this.canUseSuiteMethod = canUseSuiteMethod;
      }
  
      public ClassRequest(Class<?> testClass) {
          this(testClass, true);
      }
  
      @Override
      public Runner getRunner() {
          if (runner == null) {
              synchronized (runnerLock) {
                  if (runner == null) {
                      runner = new AllDefaultPossibilitiesBuilder(canUseSuiteMethod).safeRunnerForClass(fTestClass);
                  }
              }
          }
          return runner;
      }
  }