/source/library/Interlace/ReactorService/InvokeReactorQueueProxyHandler.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.Reflection;

using System.Text;



using Interlace.ReactorUtilities;

using Interlace.Utilities;



#endregion



namespace Interlace.ReactorService

{

    class InvokeReactorQueueProxyHandler : IProxyHandler

    {

        InvokeReactorQueue _queue;

        object _implementation;

        IThreadInvoker _invoker;



        public InvokeReactorQueueProxyHandler(InvokeReactorQueue queue, object implementation, IThreadInvoker invoker)

        {

            _queue = queue;

            _implementation = implementation;

            _invoker = invoker;

        }



        public object Invoke(object proxyObject, MethodInfo method, object[] arguments)

        {

            foreach (ParameterInfo parameter in method.GetParameters())

            {

                if (parameter.ParameterType.IsByRef)

                {

                    throw new InvalidOperationException("Remoting interfaces can not include methods that " +

                        "have \"out\" or \"ref\" parameters.");

                }

            }



            Type returnType = method.ReturnType;



            if (!Deferred.IsTypedDeferred(returnType)) 

            {

                throw new InvalidOperationException("Remoting interface methods must return a typed deferred.");

            }



            Type deferredPairType = typeof(DeferredThreadingPair<>).MakeGenericType(new Type[] { returnType });

            IDeferredThreadingPair deferredPair = 

                Activator.CreateInstance(deferredPairType, (object)_invoker) as IDeferredThreadingPair;



            _queue.AcceptRequest(method, arguments, deferredPair.ForThreadDeferred, _implementation);



            bool isProxiedReturn = method.GetCustomAttributes(typeof(ProxiedReturnAttribute), true).Length > 0;



            if (isProxiedReturn)

            {

                Type interfaceType = Deferred.DeferredResultType(returnType);



                if (!interfaceType.IsInterface)

                {

                    throw new InvalidOperationException("A return type on a method marked with the \"ProxiedReturn\" " +

                        "attribute must be a deferred of an interface.");

                }



                DeferredObject convertedDeferred = Activator.CreateInstance(returnType) as DeferredObject;



                deferredPair.ReturnDeferred.ObjectCompletion(

                    delegate(object result)

                    {

                        return _queue.CreateProxy(interfaceType, _invoker, result);

                    },

                    DeferredObject.IdentityFailback,

                    convertedDeferred);



                return convertedDeferred;

            }

            else

            {

                return deferredPair.ReturnDeferred;

            }

        }

    }

}