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.DynamicRulePublisher;
  import com.alibaba.csp.sentinel.datasource.Converter;
  import com.alibaba.csp.sentinel.util.AssertUtil;
  import org.apache.curator.framework.CuratorFramework;
  import org.apache.zookeeper.CreateMode;
  import org.apache.zookeeper.data.Stat;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.stereotype.Component;
  import org.springframework.util.CollectionUtils;
  
  import java.util.List;
  
  @Component("flowRuleZookeeperPublisher")
  public class FlowRuleZookeeperPublisher implements DynamicRulePublisher<List<FlowRuleEntity>> {
      @Autowired
      private CuratorFramework zkClient;
      @Autowired
      private Converter<List<FlowRuleEntity>, String> converter;
  
      @Override
      public void publish(String app, List<FlowRuleEntity> rules) throws Exception {
          AssertUtil.notEmpty(app, "app name cannot be empty");
  
          String path = ZookeeperConfigUtil.getPath(app);
          Stat stat = zkClient.checkExists().forPath(path);
          if (stat == null) {
              zkClient.create().creatingParentContainersIfNeeded().withMode(CreateMode.PERSISTENT).forPath(path, null);
          }
          byte[] data = CollectionUtils.isEmpty(rules) ? "[]".getBytes() : converter.convert(rules).getBytes();
          zkClient.setData().forPath(path, data);
      }
  }