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.task.AbstractExecuteTask;
  import com.alibaba.nacos.common.task.NacosTaskProcessor;
  import com.alibaba.nacos.common.utils.ThreadUtils;
  import org.slf4j.Logger;
  
  import java.util.Collection;
  
  /**
   * Nacos execute task execute engine.
   *
   * @author xiweng.yy
   */
  public class NacosExecuteTaskExecuteEngine extends AbstractNacosTaskExecuteEngine<AbstractExecuteTask> {
      
      private final TaskExecuteWorker[] executeWorkers;
      
      public NacosExecuteTaskExecuteEngine(String name, Logger logger) {
          this(name, logger, ThreadUtils.getSuitableThreadCount(1));
      }
      
      public NacosExecuteTaskExecuteEngine(String name, Logger logger, int dispatchWorkerCount) {
          super(logger);
          executeWorkers = new TaskExecuteWorker[dispatchWorkerCount];
          for (int mod = 0; mod < dispatchWorkerCount; ++mod) {
              executeWorkers[mod] = new TaskExecuteWorker(name, mod, dispatchWorkerCount, getEngineLog());
          }
      }
      
      @Override
      public int size() {
          int result = 0;
          for (TaskExecuteWorker each : executeWorkers) {
              result += each.pendingTaskCount();
          }
          return result;
      }
      
      @Override
      public boolean isEmpty() {
          return 0 == size();
      }
      
      @Override
      public void addTask(Object tag, AbstractExecuteTask task) {
          NacosTaskProcessor processor = getProcessor(tag);
          if (null != processor) {
              processor.process(task);
              return;
          }
          TaskExecuteWorker worker = getWorker(tag);
          worker.process(task);
      }
      
      private TaskExecuteWorker getWorker(Object tag) {
          int idx = (tag.hashCode() & Integer.MAX_VALUE) % workersCount();
          return executeWorkers[idx];
      }
      
      private int workersCount() {
          return executeWorkers.length;
      }
      
      @Override
      public AbstractExecuteTask removeTask(Object key) {
          throw new UnsupportedOperationException("ExecuteTaskEngine do not support remove task");
      }
      
      @Override
      public Collection<Object> getAllTaskKeys() {
          throw new UnsupportedOperationException("ExecuteTaskEngine do not support get all task keys");
      }
      
      @Override
      public void shutdown() throws NacosException {
          for (TaskExecuteWorker each : executeWorkers) {
              each.shutdown();
          }
      }
      
      /**
       * Get workers status.
       *
       * @return workers status string
       */
      public String workersStatus() {
          StringBuilder sb = new StringBuilder();
          for (TaskExecuteWorker worker : executeWorkers) {
              sb.append(worker.status()).append('\n');
          }
          return sb.toString();
      }
  }
  