The AuthorizedCalls bean (shown in Listing 13) provides thread-safe methods for managing the set of authorized calls.

Authorized Calls bean(见清单13)提供了一些线程安全的方法，用于管理这个经过授权的调用的集合。

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In some situations, the methods you implement might be called from more than one thread, and therefore must be written to be thread-safe.

在某些场合，方法可能会从不止一个线程中被调用，因此这些方法必须是写成线程安全的。

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Because these methods might be called from any number of threads at the same time, they too must be implemented to be thread-safe.

因为这些方法可能会从很多线程同时调用，它们也必须实现为线程安全的。

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