As a programmer, much of your challenge is to cope with unceasing change: new protocols, application programming interfaces (APIs), customer requirements, hardware constraints, and so on.
作为程序员，很多挑战是要应付不断的更改：新的协议、应用程序编程接口(API)、客户需求、硬件约束等。
If the queue depth is high, assume that the application is not healthy or able to cope with the rate of messages.
如果队列深度比较高，则假定应用程序不健康或不能够处理消息的速率。
The service invocation approach must be flexible enough to cope with events such as switching frequently between external providers of a similar service without requiring changes to the application.
服务调用方法必须足够灵活以处理一些事件，比如经常在类似服务的外部提供者之间切换，而不需要更改应用程序。
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