hystrix总结

hystrix封装依赖调用架构如下所示：

流程图：

四种调用方式，前两种只适用于HystrixCommand，不适用于HystrixObservableCommand

• execute() — blocks, then returns the single response received from the dependency (or throws an exception in case of an error)
• queue() — returns a Future with which you can obtain the single response from the dependency
• observe() — subscribes to the Observable that represents the response(s) from the dependency and returns an Observable that replicates that source Observable
• toObservable() — returns an Observable that, when you subscribe to it, will execute the Hystrix command and emit its responses

K             value   = command.execute();
Future<K>     fValue  = command.queue();
Observable<K> ohValue = command.observe();         //hot observable
Observable<K> ocValue = command.toObservable();    //cold observable

缓存流程示意图：

没有办法强制使超时的线程停止执行，hystrix可以抛出一个InterruptException异常，如果这个包装类InterruptException异常。

对于线程中断，Hystrix不能保证中断实际发生。像在JVM上运行的所有其他代码一样，您只能抛出一个InterruptedException，您不能强制包装的代码来捕获它。