/source/library/Interlace/ReactorUtilities/VoidDeferred.cs

#region Using Directives and Copyright Notice



// Copyright (c) 2007-2010, Computer Consultancy Pty Ltd

// 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 the Computer Consultancy Pty Ltd 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 COMPUTER CONSULTANCY PTY LTD 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.



using System;

using System.Collections.Generic;

using System.Text;



#endregion



namespace Interlace.ReactorUtilities

{

    public class VoidDeferred : DeferredObject

    {

        public delegate void Callback();

        public delegate void CallbackWithState<TState>(TState state);

        public delegate void Failback(DeferredFailure result);

        public delegate void FailbackWithState<TState>(DeferredFailure result, TState state);



        public delegate TReturn ConvertingCallback<TReturn>();

        public delegate Deferred<TReturn> ChainingCallback<TReturn>();

        public delegate void ConvertingCallback();

        public delegate VoidDeferred ChainingCallback();



        public static VoidDeferred Success()

        {

            VoidDeferred deferred = new VoidDeferred();

            deferred.SucceedObject(null);

            return deferred;

        }



        public static VoidDeferred Failure(DeferredFailure failure)

        {

            VoidDeferred deferred = new VoidDeferred();

            deferred.Fail(failure);

            return deferred;

        }



        public void Completion(Callback callback, Failback failback)

        {

            ObjectCompletion(

                delegate(object result) { callback(); return null; },

                delegate(DeferredFailure failure) { failback(failure); return null; },

                null);

        }



        public void Completion<TState>(VoidDeferred deferred)

        {

            ObjectCompletion(IdentityCallback, IdentityFailback, deferred);

        }



        public void Completion<TState>(CallbackWithState<TState> callback, Failback failback, TState state)

        {

            ObjectCompletion(

                delegate(object result) { callback(state); return null; },

                delegate(DeferredFailure failure) { failback(failure); return null; },

                null);

        }



        public void Completion<TState>(CallbackWithState<TState> callback, FailbackWithState<TState> failback, TState state)

        {

            ObjectCompletion(

                delegate(object result) { callback(state); return null; },

                delegate(DeferredFailure failure) { failback(failure, state); return null; },

                null);

        }



        public void Succeed()

        {

            SucceedObject(null);

        }



        public Deferred<TReturn> Chained<TReturn>(ChainingCallback<TReturn> callback)

        {

            Deferred<TReturn> returnDeferred = new Deferred<TReturn>();



            ObjectCompletion(delegate(object result)

            {

                Deferred<TReturn> resultDeferred = callback();



                resultDeferred.Completion(returnDeferred);



                return null;

            },

            delegate(DeferredFailure failure)

            {

                returnDeferred.Fail(failure);



                return null;

            }, null);



            return returnDeferred;

        }



        public Deferred<TReturn> Converted<TReturn>(ConvertingCallback<TReturn> callback)

        {

            Deferred<TReturn> returnDeferred = new Deferred<TReturn>();



            ObjectCompletion(delegate(object result)

            {

                return callback();

            },

            IdentityFailback, returnDeferred);



            return returnDeferred;

        }



        public VoidDeferred Chained(ChainingCallback callback)

        {

            VoidDeferred returnDeferred = new VoidDeferred();



            ObjectCompletion(delegate(object result)

            {

                VoidDeferred resultDeferred = callback();



                resultDeferred.ObjectCompletion(IdentityCallback, IdentityFailback, returnDeferred);



                return null;

            },

            delegate(DeferredFailure failure)

            {

                returnDeferred.Fail(failure);



                return null;

            }, null);



            return returnDeferred;

        }



        public VoidDeferred Converted(ConvertingCallback callback)

        {

            VoidDeferred returnDeferred = new VoidDeferred();



            ObjectCompletion(delegate(object result)

            {

                callback();



                return null;

            },

            IdentityFailback, returnDeferred);



            return returnDeferred;

        }

    }

}