使用以下代码行添加一个静态映射，跟踪为每个社区发出的实例。

Use the following line of code to add a static map that keeps track of which instance is issued for each community.

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您可以创建StateCode查询关系，以建立州全名和代码之间的静态映射。

You can create a StateCode lookup relationship to establish a static mapping between the state full names and codes.

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工厂类保留已连接的线程的静态映射，可以在线程进行调用时返回现有连接句柄，或创建并存储连接句柄。

The factory class keeps a static map of the threads that have been connected and can either return the existing connection handle, or create and store the connection handle when called by a thread.

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