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#region Copyright notice and license
// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// http://github.com/jskeet/dotnet-protobufs/
// Original C++/Java/Python code:
// http://code.google.com/p/protobuf/
//
// 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.
#endregion
using System;
using Google.ProtocolBuffers;
using Google.ProtocolBuffers.TestProtos;
using NUnit.Framework;
namespace Google.ProtocolBuffers
{
/// <summary>
/// This class verifies the correct code is generated from unittest_rpc_interop.proto and provides a small demonstration
/// of using the new IRpcDispatch to write a client/server
/// </summary>
[TestFixture]
public class TestRpcGenerator
{
/// <summary>
/// A sample implementation of the ISearchService for testing
/// </summary>
private class ExampleSearchImpl : ISearchService
{
SearchResponse ISearchService.Search(SearchRequest searchRequest)
{
if (searchRequest.CriteriaCount == 0)
{
throw new ArgumentException("No criteria specified.", new InvalidOperationException());
}
SearchResponse.Builder resp = SearchResponse.CreateBuilder();
foreach (string criteria in searchRequest.CriteriaList)
{
resp.AddResults(
SearchResponse.Types.ResultItem.CreateBuilder().SetName(criteria).SetUrl("http://search.com").
Build());
}
return resp.Build();
}
SearchResponse ISearchService.RefineSearch(RefineSearchRequest refineSearchRequest)
{
SearchResponse.Builder resp = refineSearchRequest.PreviousResults.ToBuilder();
foreach (string criteria in refineSearchRequest.CriteriaList)
{
resp.AddResults(
SearchResponse.Types.ResultItem.CreateBuilder().SetName(criteria).SetUrl("http://refine.com").
Build());
}
return resp.Build();
}
}
/// <summary>
/// An example extraction of the wire protocol
/// </summary>
private interface IWireTransfer
{
byte[] Execute(string method, byte[] message);
}
/// <summary>
/// An example of a server responding to a wire request
/// </summary>
private class ExampleServerHost : IWireTransfer
{
private readonly IRpcServerStub _stub;
public ExampleServerHost(ISearchService implementation)
{
//on the server, we create a dispatch to call the appropriate method by name
IRpcDispatch dispatch = new SearchService.Dispatch(implementation);
//we then wrap that dispatch in a server stub which will deserialize the wire bytes to the message
//type appropriate for the method name being invoked.
_stub = new SearchService.ServerStub(dispatch);
}
byte[] IWireTransfer.Execute(string method, byte[] message)
{
//now when we recieve a wire transmission to invoke a method by name with a byte[] or stream payload
//we just simply call the sub:
IMessageLite response = _stub.CallMethod(method, CodedInputStream.CreateInstance(message),
ExtensionRegistry.Empty);
//now we return the expected response message:
return response.ToByteArray();
}
}
/// <summary>
/// An example of a client sending a wire request
/// </summary>
private class ExampleClient : IRpcDispatch
{
private readonly IWireTransfer _wire;
public ExampleClient(IWireTransfer wire)
{
_wire = wire;
}
TMessage IRpcDispatch.CallMethod<TMessage, TBuilder>(string method, IMessageLite request,
IBuilderLite<TMessage, TBuilder> response)
{
byte[] rawResponse = _wire.Execute(method, request.ToByteArray());
response.MergeFrom(rawResponse);
return response.Build();
}
}
/// <summary>
/// Put it all together to create one seamless client/server experience full of rich-type goodness ;)
/// All you need to do is send/recieve the method name and message bytes across the wire.
/// </summary>
[Test]
public void TestClientServerDispatch()
{
ExampleServerHost server = new ExampleServerHost(new ExampleSearchImpl());
//obviously if this was a 'real' transport we would not use the server, rather the server would be listening, the client transmitting
IWireTransfer wire = server;
ISearchService client = new SearchService(new ExampleClient(wire));
//now the client has a real, typed, interface to work with:
SearchResponse result = client.Search(SearchRequest.CreateBuilder().AddCriteria("Test").Build());
Assert.AreEqual(1, result.ResultsCount);
Assert.AreEqual("Test", result.ResultsList[0].Name);
Assert.AreEqual("http://search.com", result.ResultsList[0].Url);
//The test part of this, call the only other method
result =
client.RefineSearch(
RefineSearchRequest.CreateBuilder().SetPreviousResults(result).AddCriteria("Refine").Build());
Assert.AreEqual(2, result.ResultsCount);
Assert.AreEqual("Test", result.ResultsList[0].Name);
Assert.AreEqual("http://search.com", result.ResultsList[0].Url);
Assert.AreEqual("Refine", result.ResultsList[1].Name);
Assert.AreEqual("http://refine.com", result.ResultsList[1].Url);
}
}
}
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