src/csharp/Grpc.Core/CallInvoker.cs

#region Copyright notice and license

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#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;
    }
}