code: /*
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed 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.
   */
  
  package io.reactivex.rxjava3.internal.schedulers;
  
  import static org.junit.Assert.*;
  
  import java.util.List;
  import java.util.concurrent.*;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.RxJavaTest;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.internal.functions.Functions;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class InstantPeriodicTaskTest extends RxJavaTest {
  
      @Test
      public void taskCrash() throws Exception {
          ExecutorService exec = Executors.newSingleThreadExecutor();
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
  
              InstantPeriodicTask task = new InstantPeriodicTask(new Runnable() {
                  @Override
                  public void run() {
                      throw new TestException();
                  }
              }, exec);
  
              try {
                  task.call();
                  fail("Should have thrown!");
              } catch (TestException excepted) {
                  // excepted
              }
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class);
          } finally {
              exec.shutdownNow();
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void dispose() throws Exception {
          ExecutorService exec = Executors.newSingleThreadExecutor();
          try {
  
              InstantPeriodicTask task = new InstantPeriodicTask(new Runnable() {
                  @Override
                  public void run() {
                      throw new TestException();
                  }
              }, exec);
  
              assertFalse(task.isDisposed());
  
              task.dispose();
  
              assertTrue(task.isDisposed());
  
              task.dispose();
  
              assertTrue(task.isDisposed());
          } finally {
              exec.shutdownNow();
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void dispose2() throws Exception {
          ExecutorService exec = Executors.newSingleThreadExecutor();
          try {
  
              InstantPeriodicTask task = new InstantPeriodicTask(new Runnable() {
                  @Override
                  public void run() {
                      throw new TestException();
                  }
              }, exec);
  
              task.setFirst(new FutureTask<Void>(Functions.EMPTY_RUNNABLE, null));
              task.setRest(new FutureTask<Void>(Functions.EMPTY_RUNNABLE, null));
  
              assertFalse(task.isDisposed());
  
              task.dispose();
  
              assertTrue(task.isDisposed());
  
              task.dispose();
  
              assertTrue(task.isDisposed());
          } finally {
              exec.shutdownNow();
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void dispose2CurrentThread() throws Exception {
          ExecutorService exec = Executors.newSingleThreadExecutor();
          try {
  
              InstantPeriodicTask task = new InstantPeriodicTask(new Runnable() {
                  @Override
                  public void run() {
                      throw new TestException();
                  }
              }, exec);
  
              task.runner = Thread.currentThread();
  
              task.setFirst(new FutureTask<Void>(Functions.EMPTY_RUNNABLE, null));
              task.setRest(new FutureTask<Void>(Functions.EMPTY_RUNNABLE, null));
  
              assertFalse(task.isDisposed());
  
              task.dispose();
  
              assertTrue(task.isDisposed());
  
              task.dispose();
  
              assertTrue(task.isDisposed());
          } finally {
              exec.shutdownNow();
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void dispose3() throws Exception {
          ExecutorService exec = Executors.newSingleThreadExecutor();
          try {
  
              InstantPeriodicTask task = new InstantPeriodicTask(new Runnable() {
                  @Override
                  public void run() {
                      throw new TestException();
                  }
              }, exec);
  
              task.dispose();
  
              FutureTask<Void> f1 = new FutureTask<>(Functions.EMPTY_RUNNABLE, null);
              task.setFirst(f1);
  
              assertTrue(f1.isCancelled());
  
              FutureTask<Void> f2 = new FutureTask<>(Functions.EMPTY_RUNNABLE, null);
              task.setRest(f2);
  
              assertTrue(f2.isCancelled());
          } finally {
              exec.shutdownNow();
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void disposeOnCurrentThread() throws Exception {
          ExecutorService exec = Executors.newSingleThreadExecutor();
          try {
  
              InstantPeriodicTask task = new InstantPeriodicTask(new Runnable() {
                  @Override
                  public void run() {
                      throw new TestException();
                  }
              }, exec);
  
              task.runner = Thread.currentThread();
  
              task.dispose();
  
              FutureTask<Void> f1 = new FutureTask<>(Functions.EMPTY_RUNNABLE, null);
              task.setFirst(f1);
  
              assertTrue(f1.isCancelled());
  
              FutureTask<Void> f2 = new FutureTask<>(Functions.EMPTY_RUNNABLE, null);
              task.setRest(f2);
  
              assertTrue(f2.isCancelled());
          } finally {
              exec.shutdownNow();
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void firstCancelRace() throws Exception {
          ExecutorService exec = Executors.newSingleThreadExecutor();
          try {
              for (int i = 0; i < TestHelper.RACE_LONG_LOOPS; i++) {
                  final InstantPeriodicTask task = new InstantPeriodicTask(new Runnable() {
                      @Override
                      public void run() {
                          throw new TestException();
                      }
                  }, exec);
  
                  final FutureTask<Void> f1 = new FutureTask<>(Functions.EMPTY_RUNNABLE, null);
                  Runnable r1 = new Runnable() {
                      @Override
                      public void run() {
                          task.setFirst(f1);
                      }
                  };
                  Runnable r2 = new Runnable() {
                      @Override
                      public void run() {
                          task.dispose();
                      }
                  };
  
                  TestHelper.race(r1, r2);
  
                  assertTrue(f1.isCancelled());
                  assertTrue(task.isDisposed());
              }
          } finally {
              exec.shutdownNow();
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void restCancelRace() throws Exception {
          ExecutorService exec = Executors.newSingleThreadExecutor();
          try {
              for (int i = 0; i < TestHelper.RACE_LONG_LOOPS; i++) {
                  final InstantPeriodicTask task = new InstantPeriodicTask(new Runnable() {
                      @Override
                      public void run() {
                          throw new TestException();
                      }
                  }, exec);
  
                  final FutureTask<Void> f1 = new FutureTask<>(Functions.EMPTY_RUNNABLE, null);
                  Runnable r1 = new Runnable() {
                      @Override
                      public void run() {
                          task.setRest(f1);
                      }
                  };
                  Runnable r2 = new Runnable() {
                      @Override
                      public void run() {
                          task.dispose();
                      }
                  };
  
                  TestHelper.race(r1, r2);
  
                  assertTrue(f1.isCancelled());
                  assertTrue(task.isDisposed());
              }
          } finally {
              exec.shutdownNow();
              RxJavaPlugins.reset();
          }
      }
  }
  