服务熔断器
在微服务架构中，经常会碰到服务超时或通讯失败的问题，由于服务间层层依赖，很可能由于某个服务出现问题，不合理的重试和超时设置，导致问题层层传递引发雪崩现象，而限流和熔断是解决这个问题重要的方式。
本章内容提要：
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技术岁月
techyears
断路器在半开状态转换到打开状态的逻辑实现感觉有问题(获取是halfMaxCalls变量定义有问题)，根据代码中的规则，在半开状态，只有连续调用成功halfMaxCalls才能生效。当断路器在半开状态并且执行失败进入onFail()方法中，断路器会转换成打开状态，不能一定保证在半开状态还能执行halfMaxCalls次
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