Public Member Functions
Descriptors.ServiceDescriptor	getDescriptorForType ()

void	callMethod (Descriptors.MethodDescriptor method, RpcController controller, Message request, RpcCallback< Message > done)

Message	getRequestPrototype (Descriptors.MethodDescriptor method)

Message	getResponsePrototype (Descriptors.MethodDescriptor method)

Detailed Description

Abstract base interface for protocol-buffer-based RPC services. Services themselves are abstract classes (implemented either by servers or as stubs), but they subclass this base interface. The methods of this interface can be used to call the methods of the service without knowing its exact type at compile time (analogous to the Message interface).

Starting with version 2.3.0, RPC implementations should not try to build on this, but should instead provide code generator plugins which generate code specific to the particular RPC implementation. This way the generated code can be more appropriate for the implementation in use and can avoid unnecessary layers of indirection.

Author: kento.nosp@m.n@go.nosp@m.ogle..nosp@m.com Kenton Varda

Member Function Documentation

◆ callMethod()

void com.google.protobuf.Service.callMethod	(	Descriptors.MethodDescriptor	method,
		RpcController	controller,
		Message	request,
		RpcCallback< Message >	done
	)

Call a method of the service specified by MethodDescriptor. This is normally implemented as a simple

switch()

that calls the standard definitions of the service's methods.

Preconditions:

method.getService() == getDescriptorForType()
request
is of the exact same class as the object returned by
getRequestPrototype(method)
.
controller
is of the correct type for the RPC implementation being used by this Service. For stubs, the "correct type" depends on the RpcChannel which the stub is using. Server-side Service implementations are expected to accept whatever type of
RpcController
the server-side RPC implementation uses.

Postconditions:

done
will be called when the method is complete. This may be before
callMethod()
returns or it may be at some point in the future.
The parameter to
done
is the response. It must be of the exact same type as would be returned by
getResponsePrototype(method)
.
If the RPC failed, the parameter to
done
will be
null
. Further details about the failure can be found by querying
controller
.

◆ getDescriptorForType()

Descriptors.ServiceDescriptor com.google.protobuf.Service.getDescriptorForType ( )

Get the

ServiceDescriptor

describing this service and its methods.

◆ getRequestPrototype()

Message com.google.protobuf.Service.getRequestPrototype ( Descriptors.MethodDescriptor method )

callMethod()

requires that the request passed in is of a particular subclass of

Message

.

getRequestPrototype()

gets the default instances of this type for a given method. You can then call

Message.newBuilderForType()

on this instance to construct a builder to build an object which you can then pass to

callMethod()

.

Example:

  MethodDescriptor method =
    service.getDescriptorForType().findMethodByName("Foo");
  Message request =
    stub.getRequestPrototype(method).newBuilderForType()
        .mergeFrom(input).build();
  service.callMethod(method, request, callback);

◆ getResponsePrototype()

Message com.google.protobuf.Service.getResponsePrototype ( Descriptors.MethodDescriptor method )

Like

getRequestPrototype()

, but gets a prototype of the response message.

getResponsePrototype()

is generally not needed because the

Service

implementation constructs the response message itself, but it may be useful in some cases to know ahead of time what type of object will be returned.

The documentation for this interface was generated from the following file:

Source/ThirdParty/libwebrtc/Source/third_party/protobuf/java/core/src/main/java/com/google/protobuf/Service.java