content: package com.alibaba.csp.sentinel.demo.zuul2.gateway;
  
  import com.alibaba.csp.sentinel.adapter.gateway.common.SentinelGatewayConstants;
  import com.alibaba.csp.sentinel.adapter.gateway.common.api.ApiDefinition;
  import com.alibaba.csp.sentinel.adapter.gateway.common.api.ApiPathPredicateItem;
  import com.alibaba.csp.sentinel.adapter.gateway.common.api.ApiPredicateItem;
  import com.alibaba.csp.sentinel.adapter.gateway.common.api.GatewayApiDefinitionManager;
  import com.alibaba.csp.sentinel.adapter.gateway.common.rule.GatewayFlowRule;
  import com.alibaba.csp.sentinel.adapter.gateway.common.rule.GatewayParamFlowItem;
  import com.alibaba.csp.sentinel.adapter.gateway.common.rule.GatewayRuleManager;
  import com.alibaba.csp.sentinel.slots.block.RuleConstant;
  
  import java.util.HashSet;
  import java.util.Set;
  
  public class GatewayRuleConfig {
  
      public void doInit() {
          // Prepare some gateway rules and API definitions (only for demo).
          // It's recommended to leverage dynamic data source or the Sentinel dashboard to push the rules.
          initCustomizedApis();
          initGatewayRules();
      }
  
      private void initCustomizedApis() {
          Set<ApiDefinition> definitions = new HashSet<>();
          ApiDefinition api1 = new ApiDefinition("some_customized_api")
              .setPredicateItems(new HashSet<ApiPredicateItem>() {{
                  add(new ApiPathPredicateItem().setPattern("/images"));
                  add(new ApiPathPredicateItem().setPattern("/comments")
                      .setMatchStrategy(SentinelGatewayConstants.URL_MATCH_STRATEGY_PREFIX));
              }});
          ApiDefinition api2 = new ApiDefinition("another_customized_api")
              .setPredicateItems(new HashSet<ApiPredicateItem>() {{
                  add(new ApiPathPredicateItem().setPattern("/**")
                      .setMatchStrategy(SentinelGatewayConstants.URL_MATCH_STRATEGY_PREFIX));
              }});
          definitions.add(api1);
          definitions.add(api2);
          GatewayApiDefinitionManager.loadApiDefinitions(definitions);
      }
  
      private void initGatewayRules() {
          Set<GatewayFlowRule> rules = new HashSet<>();
          rules.add(new GatewayFlowRule("images")
              .setCount(10)
              .setIntervalSec(1)
          );
          rules.add(new GatewayFlowRule("images")
              .setCount(2)
              .setIntervalSec(2)
              .setBurst(2)
              .setParamItem(new GatewayParamFlowItem()
                  .setParseStrategy(SentinelGatewayConstants.PARAM_PARSE_STRATEGY_CLIENT_IP)
              )
          );
          rules.add(new GatewayFlowRule("comments")
              .setCount(3)
              .setIntervalSec(1)
              .setControlBehavior(RuleConstant.CONTROL_BEHAVIOR_RATE_LIMITER)
              .setMaxQueueingTimeoutMs(6000)
              .setParamItem(new GatewayParamFlowItem()
                  .setParseStrategy(SentinelGatewayConstants.PARAM_PARSE_STRATEGY_HEADER)
                  .setFieldName("X-Sentinel-Flag")
              )
          );
          rules.add(new GatewayFlowRule("comments")
              .setCount(1)
              .setIntervalSec(1)
              .setParamItem(new GatewayParamFlowItem()
                  .setParseStrategy(SentinelGatewayConstants.PARAM_PARSE_STRATEGY_URL_PARAM)
                  .setFieldName("pa")
              )
          );
  
          rules.add(new GatewayFlowRule("some_customized_api")
              .setResourceMode(SentinelGatewayConstants.RESOURCE_MODE_CUSTOM_API_NAME)
              .setCount(5)
              .setIntervalSec(1)
              .setParamItem(new GatewayParamFlowItem()
                  .setParseStrategy(SentinelGatewayConstants.PARAM_PARSE_STRATEGY_URL_PARAM)
                  .setFieldName("pn")
              )
          );
          GatewayRuleManager.loadRules(rules);
      }
  }