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#region Copyright notice and license

// Copyright 2015 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#endregion

using System.Threading.Tasks;

namespace Grpc.Core
{
    /// <summary>
    /// Server-side handler for unary call.
    /// </summary>
    /// <typeparam name="TRequest">Request message type for this method.</typeparam>
    /// <typeparam name="TResponse">Response message type for this method.</typeparam>
    public delegate Task<TResponse> UnaryServerMethod<TRequest, TResponse>(TRequest request, ServerCallContext context)
        where TRequest : class
        where TResponse : class;

    /// <summary>
    /// Server-side handler for client streaming call.
    /// </summary>
    /// <typeparam name="TRequest">Request message type for this method.</typeparam>
    /// <typeparam name="TResponse">Response message type for this method.</typeparam>
    public delegate Task<TResponse> ClientStreamingServerMethod<TRequest, TResponse>(IAsyncStreamReader<TRequest> requestStream, ServerCallContext context)
        where TRequest : class
        where TResponse : class;

    /// <summary>
    /// Server-side handler for server streaming call.
    /// </summary>
    /// <typeparam name="TRequest">Request message type for this method.</typeparam>
    /// <typeparam name="TResponse">Response message type for this method.</typeparam>
    public delegate Task ServerStreamingServerMethod<TRequest, TResponse>(TRequest request, IServerStreamWriter<TResponse> responseStream, ServerCallContext context)
        where TRequest : class
        where TResponse : class;

    /// <summary>
    /// Server-side handler for bidi streaming call.
    /// </summary>
    /// <typeparam name="TRequest">Request message type for this method.</typeparam>
    /// <typeparam name="TResponse">Response message type for this method.</typeparam>
    public delegate Task DuplexStreamingServerMethod<TRequest, TResponse>(IAsyncStreamReader<TRequest> requestStream, IServerStreamWriter<TResponse> responseStream, ServerCallContext context)
        where TRequest : class
        where TResponse : class;
}