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 data source object is the initial object that every provider must instantiate.
资料来源物件为每个提供者都必须执行个体化的初始物件。
The data source object is the initial object that every provider must instantiate.
资料来源物件为每个提供者都必须执行个体化的初始物件。
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