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.csp.sentinel.dashboard.rule.zookeeper;
  
  import com.alibaba.csp.sentinel.dashboard.datasource.entity.rule.FlowRuleEntity;
  import com.alibaba.csp.sentinel.dashboard.rule.DynamicRuleProvider;
  import com.alibaba.csp.sentinel.datasource.Converter;
  import org.apache.curator.framework.CuratorFramework;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.stereotype.Component;
  
  import java.util.ArrayList;
  import java.util.List;
  
  @Component("flowRuleZookeeperProvider")
  public class FlowRuleZookeeperProvider implements DynamicRuleProvider<List<FlowRuleEntity>> {
  
      @Autowired
      private CuratorFramework zkClient;
      @Autowired
      private Converter<String, List<FlowRuleEntity>> converter;
  
      @Override
      public List<FlowRuleEntity> getRules(String appName) throws Exception {
          String zkPath = ZookeeperConfigUtil.getPath(appName);
          byte[] bytes = zkClient.getData().forPath(zkPath);
          if (null == bytes || bytes.length == 0) {
              return new ArrayList<>();
          }
          String s = new String(bytes);
  
          return converter.convert(s);
      }
  }