content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * 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 com.alibaba.nacos.common.task.engine;
  
  import com.alibaba.nacos.api.exception.NacosException;
  import com.alibaba.nacos.common.lifecycle.Closeable;
  import com.alibaba.nacos.common.task.AbstractExecuteTask;
  import com.alibaba.nacos.common.task.NacosTask;
  import com.alibaba.nacos.common.task.NacosTaskProcessor;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.concurrent.ArrayBlockingQueue;
  import java.util.concurrent.BlockingQueue;
  import java.util.concurrent.atomic.AtomicBoolean;
  
  /**
   * Nacos execute task execute worker.
   *
   * @author xiweng.yy
   */
  public final class TaskExecuteWorker implements NacosTaskProcessor, Closeable {
      
      /**
       * Max task queue size 32768.
       */
      private static final int QUEUE_CAPACITY = 1 << 15;
      
      private final Logger log;
      
      private final String name;
      
      private final BlockingQueue<Runnable> queue;
      
      private final AtomicBoolean closed;
      
      private final InnerWorker realWorker;
      
      public TaskExecuteWorker(final String name, final int mod, final int total) {
          this(name, mod, total, null);
      }
      
      public TaskExecuteWorker(final String name, final int mod, final int total, final Logger logger) {
          this.name = name + "_" + mod + "%" + total;
          this.queue = new ArrayBlockingQueue<>(QUEUE_CAPACITY);
          this.closed = new AtomicBoolean(false);
          this.log = null == logger ? LoggerFactory.getLogger(TaskExecuteWorker.class) : logger;
          realWorker = new InnerWorker(this.name);
          realWorker.start();
      }
      
      public String getName() {
          return name;
      }
      
      @Override
      public boolean process(NacosTask task) {
          if (task instanceof AbstractExecuteTask) {
              putTask((Runnable) task);
          }
          return true;
      }
      
      private void putTask(Runnable task) {
          try {
              queue.put(task);
          } catch (InterruptedException ire) {
              log.error(ire.toString(), ire);
          }
      }
      
      public int pendingTaskCount() {
          return queue.size();
      }
      
      /**
       * Worker status.
       */
      public String status() {
          return getName() + ", pending tasks: " + pendingTaskCount();
      }
      
      @Override
      public void shutdown() throws NacosException {
          queue.clear();
          closed.compareAndSet(false, true);
          realWorker.interrupt();
      }
      
      /**
       * Inner execute worker.
       */
      private class InnerWorker extends Thread {
          
          InnerWorker(String name) {
              setDaemon(false);
              setName(name);
          }
          
          @Override
          public void run() {
              while (!closed.get()) {
                  try {
                      Runnable task = queue.take();
                      long begin = System.currentTimeMillis();
                      task.run();
                      long duration = System.currentTimeMillis() - begin;
                      if (duration > 1000L) {
                          log.warn("task {} takes {}ms", task, duration);
                      }
                  } catch (InterruptedException e) {
                      // [issue #13752] ignore stack log
                  } catch (Throwable e) {
                      log.error("[TASK-FAILED] " + e, e);
                  }
              }
          }
      }
  }
  