/*
 * SonarQube
 * Copyright (C) 2009-2023 SonarSource SA
 * mailto:info AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.server.util;

import com.google.common.collect.ImmutableList;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import org.junit.Test;
import org.mockito.InOrder;
import org.mockito.Mockito;

import static java.util.concurrent.TimeUnit.SECONDS;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

public class AbstractStoppableExecutorServiceTest {
  private static final Callable<String> SOME_CALLABLE = () -> null;
  private static final Runnable SOME_RUNNABLE = () -> {

  };
  private static final String SOME_STRING = "some string";
  private static final long SOME_LONG = 100L;
  private static final int TIMEOUT = 5;
  private static final TimeUnit TIMEOUT_UNIT = TimeUnit.SECONDS;

  private ExecutorService executorService = mock(ExecutorService.class);
  private InOrder inOrder = Mockito.inOrder(executorService);
  private AbstractStoppableExecutorService underTest = new AbstractStoppableExecutorService(executorService) {
  };
  public static final ImmutableList<Callable<String>> CALLABLES = ImmutableList.of(SOME_CALLABLE);

  @Test
  public void stop_calls_shutdown_and_verify_termination() throws InterruptedException {
    when(executorService.awaitTermination(TIMEOUT, TIMEOUT_UNIT)).thenReturn(true);

    underTest.stop();

    inOrder.verify(executorService).shutdown();
    inOrder.verify(executorService).awaitTermination(TIMEOUT, TIMEOUT_UNIT);
    inOrder.verifyNoMoreInteractions();
  }

  @Test
  public void stop_calls_shutdown_then_shutdownNow_if_not_terminated_and_check_termination_again() throws InterruptedException {
    when(executorService.awaitTermination(TIMEOUT, TIMEOUT_UNIT)).thenReturn(false).thenReturn(true);

    underTest.stop();

    inOrder.verify(executorService).shutdown();
    inOrder.verify(executorService).awaitTermination(TIMEOUT, TIMEOUT_UNIT);
    inOrder.verify(executorService).shutdownNow();
    inOrder.verify(executorService).awaitTermination(TIMEOUT, TIMEOUT_UNIT);
    inOrder.verifyNoMoreInteractions();
  }

  @Test
  public void stop_calls_shutdownnow_if_interrupted_exception_is_raised() throws InterruptedException {
    when(executorService.awaitTermination(TIMEOUT, TIMEOUT_UNIT)).thenThrow(new InterruptedException());

    underTest.stop();

    inOrder.verify(executorService).shutdown();
    inOrder.verify(executorService).awaitTermination(TIMEOUT, TIMEOUT_UNIT);
    inOrder.verify(executorService).shutdownNow();
    inOrder.verifyNoMoreInteractions();
  }

  @Test
  public void shutdown_delegates_to_executorService() {
    underTest.shutdown();

    inOrder.verify(executorService).shutdown();
    inOrder.verifyNoMoreInteractions();
  }

  @Test
  public void shutdownNow_delegates_to_executorService() {
    underTest.shutdownNow();

    inOrder.verify(executorService).shutdownNow();
    inOrder.verifyNoMoreInteractions();
  }

  @Test
  public void isShutdown_delegates_to_executorService() {
    underTest.isShutdown();

    inOrder.verify(executorService).isShutdown();
    inOrder.verifyNoMoreInteractions();
  }

  @Test
  public void isTerminated_delegates_to_executorService() {
    underTest.isTerminated();

    inOrder.verify(executorService).isTerminated();
    inOrder.verifyNoMoreInteractions();
  }

  @Test
  public void awaitTermination_delegates_to_executorService() throws InterruptedException {
    underTest.awaitTermination(SOME_LONG, SECONDS);

    inOrder.verify(executorService).awaitTermination(SOME_LONG, SECONDS);
    inOrder.verifyNoMoreInteractions();
  }

  @Test
  public void submit_callable_delegates_to_executorService() {
    underTest.submit(SOME_CALLABLE);

    inOrder.verify(executorService).submit(SOME_CALLABLE);
    inOrder.verifyNoMoreInteractions();
  }

  @Test
  public void submit_runnable_delegates_to_executorService() {
    underTest.submit(SOME_RUNNABLE);

    inOrder.verify(executorService).submit(SOME_RUNNABLE);
    inOrder.verifyNoMoreInteractions();
  }

  @Test
  public void submit_runnable_with_result_delegates_to_executorService() {
    underTest.submit(SOME_RUNNABLE, SOME_STRING);

    inOrder.verify(executorService).submit(SOME_RUNNABLE, SOME_STRING);
    inOrder.verifyNoMoreInteractions();
  }

  @Test
  public void invokeAll_delegates_to_executorService() throws InterruptedException {
    underTest.invokeAll(CALLABLES);

    inOrder.verify(executorService).invokeAll(CALLABLES);
    inOrder.verifyNoMoreInteractions();
  }

  @Test
  public void invokeAll1_delegates_to_executorService() throws InterruptedException {
    underTest.invokeAll(CALLABLES, SOME_LONG, SECONDS);

    inOrder.verify(executorService).invokeAll(CALLABLES, SOME_LONG, SECONDS);
    inOrder.verifyNoMoreInteractions();
  }

  @Test
  public void invokeAny_delegates_to_executorService() throws ExecutionException, InterruptedException {
    underTest.invokeAny(CALLABLES);

    inOrder.verify(executorService).invokeAny(CALLABLES);
    inOrder.verifyNoMoreInteractions();
  }

  @Test
  public void invokeAny1_delegates_to_executorService() throws InterruptedException, ExecutionException, TimeoutException {
    underTest.invokeAny(CALLABLES, SOME_LONG, SECONDS);

    inOrder.verify(executorService).invokeAny(CALLABLES, SOME_LONG, SECONDS);
    inOrder.verifyNoMoreInteractions();
  }

  @Test
  public void execute_delegates_to_executorService() {
    underTest.execute(SOME_RUNNABLE);

    inOrder.verify(executorService).execute(SOME_RUNNABLE);
    inOrder.verifyNoMoreInteractions();
  }
}
