content: /*
   * Copyright 2010-2025 Hyland Software, Inc. and its affiliates.
   *
   * 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 org.activiti.engine.test.bpmn.event.end;
  
  import static org.assertj.core.api.Assertions.assertThat;
  
  import org.activiti.engine.ActivitiOptimisticLockingException;
  import org.activiti.engine.impl.test.PluggableActivitiTestCase;
  import org.activiti.engine.runtime.ProcessInstance;
  import org.activiti.engine.task.Task;
  import org.activiti.engine.test.Deployment;
  
  /**
  
   */
  public class EndEventTest extends PluggableActivitiTestCase {
  
      // Test case for ACT-1259
      @Deployment
      public void testConcurrentEndOfSameProcess() throws Exception {
          ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("oneTaskWithDelay");
          Task task = taskService.createTaskQuery().singleResult();
          assertThat(task).isNotNull();
  
          // We will now start two threads that both complete the task.
          // In the process, the task is followed by a delay of three seconds
          // This will cause both threads to call the taskService.complete method with enough time,
          // before ending the process. Both threads will now try to end the process
          // and only one should succeed (due to optimistic locking).
          TaskCompleter taskCompleter1 = new TaskCompleter(task.getId());
          TaskCompleter taskCompleter2 = new TaskCompleter(task.getId());
  
          assertThat(taskCompleter1.isSucceeded()).isFalse();
          assertThat(taskCompleter2.isSucceeded()).isFalse();
  
          taskCompleter1.start();
          taskCompleter2.start();
          taskCompleter1.join();
          taskCompleter2.join();
  
          int successCount = 0;
          if (taskCompleter1.isSucceeded()) {
              successCount++;
          }
          if (taskCompleter2.isSucceeded()) {
              successCount++;
          }
  
          assertThat(successCount)
              .as("(Only) one thread should have been able to successfully end the process")
              .isEqualTo(1);
          assertProcessEnded(processInstance.getId());
      }
  
      /** Helper class for concurrent testing */
      class TaskCompleter extends Thread {
  
          protected String taskId;
          protected boolean succeeded;
  
          public TaskCompleter(String taskId) {
              this.taskId = taskId;
          }
  
          public boolean isSucceeded() {
              return succeeded;
          }
  
          public void run() {
              try {
                  taskService.complete(taskId);
                  succeeded = true;
              } catch (ActivitiOptimisticLockingException ae) {
                  // Exception is expected for one of the threads
              }
          }
      }
  }
  