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Contains metaclasses used to create protocol service and service stub
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The GeneratedServiceType and GeneratedServiceStubType metaclasses are used to
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compiler at compile-time.
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Creates a message service class.

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This class constructs a protocol service class using a service descriptor.

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The body of all methods in the generated service class.

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Constructs a protocol service stub class using a service descriptor.

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The body of all service methods in the generated stub class.

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