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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;
namespace Google.ProtocolBuffers
{
/// <summary>
/// Mediates a single method call. The primary purpose of the controller
/// is to provide a way to manipulate settings specific to the
/// RPC implementation and to find out about RPC-level errors.
///
/// The methods provided by this interface are intended to be a "least
/// common denominator" set of features which we expect all implementations to
/// support. Specific implementations may provide more advanced features,
/// (e.g. deadline propagation).
/// </summary>
public interface IRpcController
{
#region Client side calls
// These calls may be made from the client side only. Their results
// are undefined on the server side (may throw exceptions).
/// <summary>
/// Resets the controller to its initial state so that it may be reused in
/// a new call. This can be called from the client side only. It must not
/// be called while an RPC is in progress.
/// </summary>
void Reset();
/// <summary>
/// After a call has finished, returns true if the call failed. The possible
/// reasons for failure depend on the RPC implementation. Failed must
/// only be called on the client side, and must not be called before a call has
/// finished.
/// </summary>
bool Failed { get; }
/// <summary>
/// If Failed is true, ErrorText returns a human-readable description of the error.
/// </summary>
string ErrorText { get; }
/// <summary>
/// Advises the RPC system that the caller desires that the RPC call be
/// canceled. The RPC system may cancel it immediately, may wait awhile and
/// then cancel it, or may not even cancel the call at all. If the call is
/// canceled, the "done" callback will still be called and the RpcController
/// will indicate that the call failed at that time.
/// </summary>
void StartCancel();
#endregion
#region Server side calls
// These calls may be made from the server side only. Their results
// are undefined on the client side (may throw exceptions).
/// <summary>
/// Causes Failed to return true on the client side. <paramref name="reason"/>
/// will be incorporated into the message returned by ErrorText.
/// If you find you need to return machine-readable information about
/// failures, you should incorporate it into your response protocol buffer
/// and should *not* call SetFailed.
/// </summary>
void SetFailed(string reason);
/// <summary>
/// If true, indicates that the client canceled the RPC, so the server may as
/// well give up on replying to it. This method must be called on the server
/// side only. The server should still call the final "done" callback.
/// </summary>
bool IsCanceled();
/// <summary>
/// Requests that the given callback be called when the RPC is canceled.
/// The parameter passed to the callback will always be null. The callback will
/// be called exactly once. If the RPC completes without being canceled, the
/// callback will be called after completion. If the RPC has already been canceled
/// when NotifyOnCancel is called, the callback will be called immediately.
///
/// NotifyOnCancel must be called no more than once per request. It must be
/// called on the server side only.
/// </summary>
/// <param name="callback"></param>
void NotifyOnCancel(Action<object> callback);
#endregion
}
}
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