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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package com.google.protobuf;
/**
* <p>Abstract interface for an RPC channel. An {@code RpcChannel} represents a
* communication line to a {@link Service} which can be used to call that
* {@link Service}'s methods. The {@link Service} may be running on another
* machine. Normally, you should not call an {@code RpcChannel} directly, but
* instead construct a stub {@link Service} wrapping it. Example:
*
* <pre>
* RpcChannel channel = rpcImpl.newChannel("remotehost.example.com:1234");
* RpcController controller = rpcImpl.newController();
* MyService service = MyService.newStub(channel);
* service.myMethod(controller, request, callback);
* </pre>
*
* <p>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 kenton@google.com Kenton Varda
*/
public interface RpcChannel {
/**
* Call the given method of the remote service. This method is similar to
* {@code Service.callMethod()} with one important difference: the caller
* decides the types of the {@code Message} objects, not the callee. The
* request may be of any type as long as
* {@code request.getDescriptor() == method.getInputType()}.
* The response passed to the callback will be of the same type as
* {@code responsePrototype} (which must have
* {@code getDescriptor() == method.getOutputType()}).
*/
void callMethod(Descriptors.MethodDescriptor method,
RpcController controller,
Message request,
Message responsePrototype,
RpcCallback<Message> done);
}
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