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.common.task.NacosTask;
  import com.alibaba.nacos.common.task.NacosTaskProcessor;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.Collection;
  import java.util.concurrent.ConcurrentHashMap;
  
  /**
   * Abstract nacos task execute engine.
   *
   * @author xiweng.yy
   */
  public abstract class AbstractNacosTaskExecuteEngine<T extends NacosTask> implements NacosTaskExecuteEngine<T> {
      
      private final Logger log;
      
      private final ConcurrentHashMap<Object, NacosTaskProcessor> taskProcessors = new ConcurrentHashMap<>();
      
      private NacosTaskProcessor defaultTaskProcessor;
      
      public AbstractNacosTaskExecuteEngine(Logger logger) {
          this.log = null != logger ? logger : LoggerFactory.getLogger(AbstractNacosTaskExecuteEngine.class.getName());
      }
      
      @Override
      public void addProcessor(Object key, NacosTaskProcessor taskProcessor) {
          taskProcessors.putIfAbsent(key, taskProcessor);
      }
      
      @Override
      public void removeProcessor(Object key) {
          taskProcessors.remove(key);
      }
      
      @Override
      public NacosTaskProcessor getProcessor(Object key) {
          return taskProcessors.containsKey(key) ? taskProcessors.get(key) : defaultTaskProcessor;
      }
      
      @Override
      public Collection<Object> getAllProcessorKey() {
          return taskProcessors.keySet();
      }
      
      @Override
      public void setDefaultTaskProcessor(NacosTaskProcessor defaultTaskProcessor) {
          this.defaultTaskProcessor = defaultTaskProcessor;
      }
      
      protected Logger getEngineLog() {
          return log;
      }
  }
  