content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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.ververica.demo.backend.controllers;
  
  import com.fasterxml.jackson.core.JsonProcessingException;
  import com.fasterxml.jackson.databind.ObjectMapper;
  import com.ververica.demo.backend.entities.Rule;
  import com.ververica.demo.backend.model.RulePayload;
  import com.ververica.demo.backend.model.RulePayload.ControlType;
  import com.ververica.demo.backend.model.RulePayload.RuleState;
  import com.ververica.demo.backend.services.FlinkRulesService;
  import org.springframework.web.bind.annotation.GetMapping;
  import org.springframework.web.bind.annotation.RequestMapping;
  import org.springframework.web.bind.annotation.RestController;
  
  @RestController
  @RequestMapping("/api")
  public class FlinkController {
  
    private final FlinkRulesService flinkRulesService;
  
    // Currently rules channel is also (mis)used for control messages. This has to do with how control
    // channels are set up in Flink Job.
    FlinkController(FlinkRulesService flinkRulesService) {
      this.flinkRulesService = flinkRulesService;
    }
  
    private final ObjectMapper mapper = new ObjectMapper();
  
    @GetMapping("/syncRules")
    void syncRules() throws JsonProcessingException {
      Rule command = createControllCommand(ControlType.EXPORT_RULES_CURRENT);
      flinkRulesService.addRule(command);
    }
  
    @GetMapping("/clearState")
    void clearState() throws JsonProcessingException {
      Rule command = createControllCommand(ControlType.CLEAR_STATE_ALL);
      flinkRulesService.addRule(command);
    }
  
    private Rule createControllCommand(ControlType clearStateAll) throws JsonProcessingException {
      RulePayload payload = new RulePayload();
      payload.setRuleState(RuleState.CONTROL);
      payload.setControlType(clearStateAll);
      Rule rule = new Rule();
      rule.setRulePayload(mapper.writeValueAsString(payload));
      return rule;
    }
  }
  