目录

一、简介

二、思路

三、示例代码

一、简介

这篇文章总结hystrix链路跟踪器的实现

二、思路

上一篇文章总结了feign的链路跟踪器的实现，同样的，这里也可以用AOP来拦截，除此之外，hystrix还有一些自身的特点

1、需要从http中获取链路信息，由于是新建的线程需要特殊处理，可以参看《springCloud微服务系列——OAuth2+JWT模式下的feign+hystrix处理》

2、处理结束后，需要销毁上下文信息

三、示例代码

@Component
public class RequestAttributeHystrixConcurrencyStrategy extends HystrixConcurrencyStrategy {

	private static final Logger logger = LoggerFactory.getLogger(RequestAttributeHystrixConcurrencyStrategy.class);
	private HystrixConcurrencyStrategy delegate;
	public RequestAttributeHystrixConcurrencyStrategy() {
		try {
			this.delegate = HystrixPlugins.getInstance().getConcurrencyStrategy();
			if (this.delegate instanceof RequestAttributeHystrixConcurrencyStrategy) {
				// Welcome to singleton hell...
				return;
			}
			HystrixCommandExecutionHook commandExecutionHook = HystrixPlugins
					.getInstance().getCommandExecutionHook();
			HystrixEventNotifier eventNotifier = HystrixPlugins.getInstance()
					.getEventNotifier();
			HystrixMetricsPublisher metricsPublisher = HystrixPlugins.getInstance()
					.getMetricsPublisher();
			HystrixPropertiesStrategy propertiesStrategy = HystrixPlugins.getInstance()
					.getPropertiesStrategy();
			this.logCurrentStateOfHystrixPlugins(eventNotifier, metricsPublisher,
					propertiesStrategy);
			HystrixPlugins.reset();
			HystrixPlugins.getInstance().registerConcurrencyStrategy(this);
			HystrixPlugins.getInstance()
					.registerCommandExecutionHook(commandExecutionHook);
			HystrixPlugins.getInstance().registerEventNotifier(eventNotifier);
			HystrixPlugins.getInstance().registerMetricsPublisher(metricsPublisher);