A callback function that creates the provider object.
一个回调函数，用于创建提供程序对象。
Opens a stream for reading the virtual path of the current build provider object.
开启资料流，以读取目前的组建提供者物件的虚拟路径。
The session object represents a single conversation between a consumer and provider.
工作阶段物件代表消费者和提供者之间的单一转换。
The session object represents a single conversation between a consumer and provider.
工作阶段物件代表消费者和提供者之间的单一转换。
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