#region Copyright notice and license

// Copyright 2015, Google Inc.
// All rights reserved.
//
// 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.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;
}
