/source/library/Interlace/Utilities/Proxies.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;



#endregion



namespace Interlace.Utilities

{

    public static class Proxies

    {

        static ProxyGeneratorCore _generator;

        static Dictionary<Type, ProxyFactoryBase> _proxyFactories;

        static ReaderWriterLock _lock;



        static Proxies()

        {

            _generator = new ProxyGeneratorCore();

            _proxyFactories = new Dictionary<Type, ProxyFactoryBase>();

            _lock = new ReaderWriterLock();

        }



        public static TInterface MakeProxy<TInterface>(IProxyHandler handler) where TInterface : class

        {

            return MakeProxyFactory<TInterface>().Create(handler) as TInterface;

        }



        public static object MakeProxy(Type interfaceType, IProxyHandler handler) 

        {

            return MakeProxyFactory(interfaceType).CreateBase(handler);

        }



        public static ProxyFactory<TInterface> MakeProxyFactory<TInterface>() where TInterface : class

        {

            return MakeProxyFactory(typeof(TInterface)) as ProxyFactory<TInterface>;

        }



        public static ProxyFactoryBase MakeProxyFactory(Type interfaceType) 

        {

            if (!interfaceType.IsInterface)

            {

                throw new ArgumentException("A proxy factory can only be generated for an interface.", "interfaceType");

            }

            

            _lock.AcquireReaderLock(-1);



            try

            {

                if (_proxyFactories.ContainsKey(interfaceType))

                {

                    return _proxyFactories[interfaceType];

                }

                else

                {

                    _lock.UpgradeToWriterLock(-1);



                    ProxyFactoryBase proxyFactory = _generator.GenerateProxy(interfaceType);

                    _proxyFactories[interfaceType] = proxyFactory;



                    return proxyFactory;

                }

            }

            finally

            {

                _lock.ReleaseLock();

            }

        }

    }

}