Thread1 是一个周期性线程（扩展 WatchedPeriodicThread），运行 10 个迭代后由于 “意外” 异常而终止。

Thread1 is a periodic thread (extends WatchedPeriodicThread) that runs for 10 iterations and then dies because of an "unexpected" exception.

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一个扩展执行模型，可以支持周期性计算和执行策略控制，为每一个活性对象实现异步化、事件驱动激活或周期性激活。

An extended execution model that supports periodic calculations and control of execution policies for each active object as asynchronous, event-driven activation, or for periodic activation.

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扩展：与适应周期性负载相比，升级容量是更常见的扩展情况。

Scaling: Upgrading capacity is a more common case of scaling than is accommodation of cyclical loads.

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