#region Copyright notice and license

// Copyright 2015-2016, 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
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#endregion

using System.Threading.Tasks;
using Grpc.Core.Internal;

namespace Grpc.Core
{
    /// <summary>
    /// Abstraction of client-side RPC invocation.
    /// </summary>
    /// <seealso cref="Calls"/>
    public abstract class CallInvoker
    {
        /// <summary>
        /// Invokes a simple remote call in a blocking fashion.
        /// </summary>
        public abstract TResponse BlockingUnaryCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options, TRequest request)
            where TRequest : class
            where TResponse : class;

        /// <summary>
        /// Invokes a simple remote call asynchronously.
        /// </summary>
        public abstract AsyncUnaryCall<TResponse> AsyncUnaryCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options, TRequest request)
            where TRequest : class
            where TResponse : class;

        /// <summary>
        /// Invokes a server streaming call asynchronously.
        /// In server streaming scenario, client sends on request and server responds with a stream of responses.
        /// </summary>
        public abstract AsyncServerStreamingCall<TResponse> AsyncServerStreamingCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options, TRequest request)
            where TRequest : class
            where TResponse : class;

        /// <summary>
        /// Invokes a client streaming call asynchronously.
        /// In client streaming scenario, client sends a stream of requests and server responds with a single response.
        /// </summary>
        public abstract AsyncClientStreamingCall<TRequest, TResponse> AsyncClientStreamingCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options)
            where TRequest : class
            where TResponse : class;

        /// <summary>
        /// Invokes a duplex streaming call asynchronously.
        /// In duplex streaming scenario, client sends a stream of requests and server responds with a stream of responses.
        /// The response stream is completely independent and both side can be sending messages at the same time.
        /// </summary>
        public abstract AsyncDuplexStreamingCall<TRequest, TResponse> AsyncDuplexStreamingCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options)
            where TRequest : class
            where TResponse : class;
    }
}