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.impl.asyncexecutor;
  
  import jakarta.enterprise.concurrent.ManagedThreadFactory;
  import java.util.concurrent.ArrayBlockingQueue;
  import java.util.concurrent.ThreadPoolExecutor;
  import java.util.concurrent.TimeUnit;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Simple JSR-236 async job executor to allocate threads through {@link ManagedThreadFactory}. Falls back to {@link AsyncExecutor} when a thread factory was not referenced in configuration.
   * In Java EE 7, all application servers should provide access to a {@link ManagedThreadFactory}.
   *
   */
  public class ManagedAsyncJobExecutor extends DefaultAsyncJobExecutor {
  
      private static Logger log = LoggerFactory.getLogger(ManagedAsyncJobExecutor.class);
  
      protected ManagedThreadFactory threadFactory;
  
      public ManagedThreadFactory getThreadFactory() {
          return threadFactory;
      }
  
      public void setThreadFactory(ManagedThreadFactory threadFactory) {
          this.threadFactory = threadFactory;
      }
  
      protected void initAsyncJobExecutionThreadPool() {
          if (threadFactory == null) {
              log.warn("A managed thread factory was not found, falling back to self-managed threads");
              super.initAsyncJobExecutionThreadPool();
          } else {
              if (threadPoolQueue == null) {
                  log.info("Creating thread pool queue of size {}", queueSize);
                  threadPoolQueue = new ArrayBlockingQueue<Runnable>(queueSize);
              }
  
              if (executorService == null) {
                  log.info(
                      "Creating executor service with corePoolSize {}, maxPoolSize {} and keepAliveTime {}",
                      corePoolSize,
                      maxPoolSize,
                      keepAliveTime
                  );
  
                  ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(
                      corePoolSize,
                      maxPoolSize,
                      keepAliveTime,
                      TimeUnit.MILLISECONDS,
                      threadPoolQueue,
                      threadFactory
                  );
                  threadPoolExecutor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
                  executorService = threadPoolExecutor;
              }
  
              startJobAcquisitionThread();
          }
      }
  }
  