namespace Microshaoft.MEF.Contracts
{
    using System;
    public delegate void ExceptionEventHandler<TSender>(TSender sender, Exception exception);
}
namespace Microshaoft.MEF.Contracts
{
    using System;
    public interface IMefChainedProcessorPart<TContainer, TPartKey, TResult, TParameter>
    {
        IMefChainedProcessorPart<TContainer, TPartKey, TResult, TParameter> Instance
        {
            get;
        }
        int Priority
        {
            get;
        }
        TPartKey Key
        {
            get;
        }
        void OnOnceProcessAction(params TParameter[] parameters);
        TResult OnOnceProcessFunc(params TParameter[] parameters);
        void OnChainedOnceProcessAction(out ChainedProcessNextStep next, params TParameter[] parameters);
        TResult OnChainedOnceProcessFunc(out ChainedProcessNextStep next, params TParameter[] parameters);
        void OnChainedOnceAsyncQueueProcessAction(out ChainedProcessNextStep next, params TParameter[] parameters);
        bool OnChainedOnceAsyncQueueProcessFunc(out ChainedProcessNextStep next, params TParameter[] parameters);
        event ExceptionEventHandler<IMefChainedProcessorPart<TContainer, TPartKey ,TResult, TParameter>> OnCaughtExceptionInContainer;
        string GetRuntimeTypeFullName();
        Type GetRuntimeType();
    }
    public enum ChainedProcessNextStep
    {
        Continue
        , Break
    }
}
namespace Microshaoft.MEF.Contracts
{
    using System;
    using System.Xml;
    public interface IMefPartsCompositionContainer<TPart, TPartKey, TResult, TInvokeParameter>
    {
        TPart[] Parts
        {
            get;
        }
        void ImportManyExports(string path);
        void ChainedInvokeAllPartsProcessAction(params TInvokeParameter[] parameters);
        TResult ChainedInvokeAllPartsProcessFunc(params TInvokeParameter[] parameters);
        TResult InvokeOnePartProcessFunc(TPartKey PartKey, params TInvokeParameter[] parameters);
        void InvokeOnePartProcessAction(TPartKey PartKey, params TInvokeParameter[] parameters);
    }
}
//=============================================================================================================================
namespace Microshaoft.MEF.CompositionContainers
{
    using Microshaoft;
    using Microshaoft.MEF.Contracts;
    using System;
    using System.Collections.Concurrent;
    using System.ComponentModel.Composition;
    using System.Linq;
    public class XmlMessageProcessorsCompositionContainer
                    : IMefPartsCompositionContainer
                            <
                                IMefChainedProcessorPart
                                            <
                                                XmlMessageProcessorsCompositionContainer
                                                , string
                                                , string
                                                , string
                                            >
                                , string
                                , string
                                , string
                            >
    {
        [ImportMany(typeof(IMefChainedProcessorPart<XmlMessageProcessorsCompositionContainer,string, string, string>))]
        public IMefChainedProcessorPart<XmlMessageProcessorsCompositionContainer,string, string, string>[] Parts
        {
            get;
            private set;
        }
        ConcurrentDictionary<string, IMefChainedProcessorPart<XmlMessageProcessorsCompositionContainer,string, string, string>> _dictionary;
        public void ImportManyExports(string path)
        {
            MEFHelper.ImportManyExportsComposeParts<XmlMessageProcessorsCompositionContainer>
                                                (
                                                    path
                                                    , this
                                                );
            var result = Parts.OrderBy(x => x.Priority);
            if (_dictionary == null)
            {
                _dictionary = new ConcurrentDictionary<string, IMefChainedProcessorPart<XmlMessageProcessorsCompositionContainer, string, string, string>>();
            }
            result.ToList().ForEach
                            (
                                x
                                =>
                                {
                                    _dictionary[x.Key] = x;
                                }
                            );
        }
        public void ChainedInvokeAllPartsProcessAction(params string[] parameters)
        {
            throw new NotImplementedException();
        }
        public string ChainedInvokeAllPartsProcessFunc(params string[] parameters)
        {
            throw new NotImplementedException();
        }
        public string InvokeOnePartProcessFunc(string PartKey, params string[] parameters)
        {
            string r = string.Empty;
            IMefChainedProcessorPart<XmlMessageProcessorsCompositionContainer,string, string, string> part;
            if (_dictionary.TryGetValue(PartKey, out part))
            {
                r = part.OnOnceProcessFunc(parameters[0]);
            }
            return r;
        }
        public void InvokeOnePartProcessAction(string PartKey, params string[] parameters)
        {
            throw new NotImplementedException();
        }
    }
}
namespace Microshaoft.MEF.CompositionContainersManagers
{
    using Microshaoft.MEF.CompositionContainers;
    public static class CompositionContainersManager
    {
        private static XmlMessageProcessorsCompositionContainer _xmlMessageProcessorsCompositionContainer =
                                new XmlMessageProcessorsCompositionContainer();
        public static XmlMessageProcessorsCompositionContainer xmlMessageProcessorsCompositionContainer
        {
            get { return CompositionContainersManager._xmlMessageProcessorsCompositionContainer; }
            set { CompositionContainersManager._xmlMessageProcessorsCompositionContainer = value; }
        }
    }
}
namespace Microshaoft
{
    using System.ComponentModel.Composition;
    using System.ComponentModel.Composition.Hosting;
    public static class MEFHelper
    {
        public static void ImportManyExportsComposeParts<T>(string path, T attributedPart)
        {
            var catalog = new AggregateCatalog();
            catalog.Catalogs.Add(new DirectoryCatalog(path));
            var container = new CompositionContainer(catalog);
            container.ComposeParts(attributedPart);
        }
    }
}
//=====================================================================================================================
//可扩展部件样例
namespace Microshaoft.MEF.Parts
{
    using Microshaoft.MEF.Contracts;
    using Microshaoft.MEF.CompositionContainers;
    using System;
    using System.ComponentModel.Composition;
    [Export(typeof(IMefChainedProcessorPart<XmlMessageProcessorsCompositionContainer, string, string, string>))]
    public class SampleXmlMessageProcessorPart : IMefChainedProcessorPart<XmlMessageProcessorsCompositionContainer, string, string, string>
    {
        public IMefChainedProcessorPart<XmlMessageProcessorsCompositionContainer, string, string, string> Instance
        {
            get { throw new NotImplementedException(); }
        }
        public int Priority
        {
            get
            {
                return 100;
            }
        }
        public string Key
        {
            get
            {
                return "SampleXmlMessageProcessorPart";
            }
        }
        public void OnOnceProcessAction(params string[] parameters)
        {
            throw new NotImplementedException();
        }
        public string OnOnceProcessFunc(params string[] parameters)
        {
            return "";
        }
        public void OnChainedOnceProcessAction(out ChainedProcessNextStep next, params string[] parameters)
        {
            throw new NotImplementedException();
        }
        public string OnChainedOnceProcessFunc(out ChainedProcessNextStep next, params string[] parameters)
        {
            throw new NotImplementedException();
        }
        public void OnChainedOnceAsyncQueueProcessAction(out ChainedProcessNextStep next, params string[] parameters)
        {
            throw new NotImplementedException();
        }
        public bool OnChainedOnceAsyncQueueProcessFunc(out ChainedProcessNextStep next, params string[] parameters)
        {
            throw new NotImplementedException();
        }
        public string GetRuntimeTypeFullName()
        {
            throw new NotImplementedException();
        }
        public Type GetRuntimeType()
        {
            throw new NotImplementedException();
        }
        void SampleXmlMessageProcessorPart_OnCaughtExceptionInContainer(IMefChainedProcessorPart<XmlMessageProcessorsCompositionContainer, string, string, string> sender, Exception exception)
        {
            throw new NotImplementedException();
        }
        public event ExceptionEventHandler<IMefChainedProcessorPart<XmlMessageProcessorsCompositionContainer, string, string, string>>
                    OnCaughtExceptionInContainer =
                                                    (
                                                        (x, y) =>
                                                        {
                                                        }
                                                    );
    }
}