Spring Cloud Alibaba - 利用Nacos实现高效动态线程池管理

import com.alibaba.csp.sentinel.slots.block.flow.FlowRule;
import com.alibaba.csp.sentinel.slots.block.flow.FlowRuleManager;
import com.alibaba.nacos.api.config.ConfigService;
import com.alibaba.nacos.api.config.listener.Listener;
import com.alibaba.nacos.api.exception.NacosException;
import com.alibaba.nacos.spring.context.annotation.config.NacosPropertySource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.DependsOn;
 
import javax.annotation.PostConstruct;
import java.util.List;
import java.util.Properties;
 
@Configuration
@DependsOn("sentinelPropertySource")
@NacosPropertySource(dataId = "sentinel-flow-rules", groupId = "DEFAULT_GROUP", autoRefreshed = true)
public class SentinelNacosConfig {
 
    @Value("${nacos.config.server-addr}")
    private String serverAddr;
 
    @PostConstruct
    public void init() throws NacosException {
        ConfigService configService = NacosConfigServiceFactory.getConfigService(serverAddr);
        configService.addListener("sentinel-flow-rules", "DEFAULT_GROUP", new Listener() {
            @Override
            public void receiveConfigInfo(String configInfo) {
                Properties properties = new Properties();
                properties.load(new ByteArrayInputStream(configInfo.getBytes()));
                // 解析配置信息，转换为FlowRule列表
                List<FlowRule> rules = SentinelRuleParser.parseFlowRule(properties);
                // 更新Sentinel的流控规则
                FlowRuleManager.loadRules(rules);
            }
 
            @Override
            public Executor getExecutor() {
                return null;
            }
        });
        // 立即获取并应用配置
        String flowRules = configService.getConfig("sentinel-flow-rules", "DEFAULT_GROUP", 3000);
        Properties properties = new Properties();
        properties.load(new ByteArrayInputStream(flowRules.getBytes()));
        List<FlowRule> rules = SentinelRuleParser.parseFlowRule(properties);
        FlowRuleManager.loadRules(rules);
    }
}

这个代码示例展示了如何使用Nacos作为配置中心来管理Sentinel的流控规则。在Nacos中配置好相应的规则后，应用启动时会从Nacos拉取配置并动态更新到Sentinel规则管理器中，实现了动态的流量控制。