/source/library/Interlace/ReactorService/BlockingReactorThreadInvoker.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;

using System.Threading;



using Interlace.ReactorCore;

using Interlace.Utilities;



#endregion



namespace Interlace.ReactorService

{

    public class BlockingReactorThreadInvoker : IThreadInvoker

    {

        delegate void QueueDelegate();



        ReactorThreadInvokerQueue _queue;



        public BlockingReactorThreadInvoker(ReactorThreadInvokerQueue queue)

        {

            _queue = queue;

        }



        #region IThreadInvoker Members



        public object Invoke(Delegate method)

        {

            return Invoke(method, new object[] { });

        }



        public object Invoke(Delegate method, params object[] args)

        {

            object result = null;

            Exception exception = null;



            using (ManualResetEvent waitHandle = new ManualResetEvent(false))

            {

                _queue._queue.Enqueue(

                    delegate()

                    {

                        try

                        {

                            result = method.DynamicInvoke(args);

                        }

                        catch (Exception e)

                        {

                            exception = e;

                        }



                        waitHandle.Set();

                    });



                waitHandle.WaitOne();

            }



            if (exception != null)

            {

                throw new ReactorInvocationException("An exception occurred invoking a method " +

                    "in a reactor thread; check InnerException for the exception.", exception);

            }

            else

            {

                return result;

            }

        }



        #endregion

    }

}