ChannelManagerHelpers.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx35 / System.WorkflowServices / System / Workflow / Runtime / Hosting / ChannelManagerHelpers.cs / 1305376 / ChannelManagerHelpers.cs
                        
                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

namespace System.Workflow.Runtime.Hosting 
{
    using System; 
    using System.Collections; 
    using System.Collections.Generic;
    using System.Diagnostics; 
    using System.IdentityModel.Claims;
    using System.Reflection;
    using System.Runtime;
    using System.Security.Principal; 
    using System.ServiceModel;
    using System.ServiceModel.Channels; 
    using System.ServiceModel.Configuration; 
    using System.ServiceModel.Description;
 
    static class ChannelManagerHelpers
    {
        static Hashtable contractInfoCollection = Hashtable.Synchronized(new Hashtable());
        static object thisLock = new object(); 

        public static EndpointAddress BuildCacheAddress(string endpointName, Type contractType) 
        { 
            Fx.Assert(!string.IsNullOrEmpty(endpointName), "endpointName should not be null");
            Fx.Assert(contractType != null, "contractType should not be null"); 

            return BuildCacheAddress(endpointName, contractType.AssemblyQualifiedName);
        }
 
        public static EndpointAddress BuildCacheAddress(string endpointName, string contractName)
        { 
            Fx.Assert(!string.IsNullOrEmpty(endpointName), "endpointName should not be null"); 
            Fx.Assert(!string.IsNullOrEmpty(contractName), "contractName should not be null");
 
            return new EndpointAddress("channelCache://" + endpointName + "/" + contractName);
        }

        public static EndpointAddress BuildCacheAddressWithIdentity(EndpointAddress address) 
        {
            Fx.Assert(address != null, "address should not be null"); 
 
            WindowsIdentity identity = WindowsIdentity.GetCurrent();
            try 
            {
                Claim claim = Claim.CreateWindowsSidClaim(identity.User);
                EndpointIdentity endpointIdentity = EndpointIdentity.CreateIdentity(claim);
                return new EndpointAddress(address.Uri, endpointIdentity); 
            }
            finally 
            { 
                identity.Dispose();
            } 
        }

        public static void CloseCommunicationObject(ICommunicationObject communicationObject)
        { 
            CloseCommunicationObject(communicationObject, ServiceDefaults.CloseTimeout);
        } 
 
        public static void CloseCommunicationObject(ICommunicationObject communicationObject, TimeSpan timeout)
        { 
            if (communicationObject == null)
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("communicationObject");
            } 

            bool flag = true; 
            try 
            {
                if (communicationObject.State == CommunicationState.Opened) 
                {
                    communicationObject.Close(timeout);
                    flag = false;
                } 
            }
            catch (CommunicationException communicatioException) 
            { 
                if (DiagnosticUtility.ShouldTraceInformation)
                { 
                    DiagnosticUtility.ExceptionUtility.TraceHandledException(communicatioException, TraceEventType.Information);
                }
            }
            catch (TimeoutException timeoutException) 
            {
                if (DiagnosticUtility.ShouldTraceInformation) 
                { 
                    DiagnosticUtility.ExceptionUtility.TraceHandledException(timeoutException, TraceEventType.Information);
                } 
            }
            finally
            {
                if (flag) 
                {
                    communicationObject.Abort(); 
                } 
            }
        } 

        public static IChannel CreateChannel(Type contractType, ChannelFactory factory, string customAddress)
        {
            if (contractType == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("contractType"); 
            } 

            if (factory == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("factory");
            }
 
            IChannel channel = null;
            bool channelFailed = true; 
 
            try
            { 
                ContractInfo contractInfo = GetContractInfo(contractType);
                if (string.IsNullOrEmpty(customAddress))
                {
                    channel = contractInfo.CreateChannelMethodInfo.Invoke(factory, null) as IChannel; 
                }
                else 
                { 
                    channel = contractInfo.CreateChannelWithCustomAddressMethodInfo.Invoke(factory,
                        new object[1] { new EndpointAddress(customAddress) }) as IChannel; 
                }

                if (!contractInfo.IsSessionless)
                { 
                    IContextManager contextManager = channel.GetProperty();
                    if (contextManager != null) 
                    { 
                        contextManager.Enabled = false;
                    } 
                }

                channel.Open();
 
                channelFailed = false;
            } 
            catch (TargetInvocationException exception) 
            {
                if (exception.InnerException != null) 
                {
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(exception.InnerException);
                }
 
                throw;
            } 
            finally 
            {
                if (channel != null && channelFailed) 
                {
                    channel.Abort();
                    channel = null;
                } 
            }
 
            return channel; 
        }
 
        public static ChannelFactory CreateChannelFactory(string endpointName, Type contractType)
        {
            return CreateChannelFactory(endpointName, contractType, null);
        } 

        public static ChannelFactory CreateChannelFactory(string endpointName, Type contractType, IDictionary codeEndpoints) 
        { 
            if (string.IsNullOrEmpty(endpointName))
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("endpointName");
            }

            if (contractType == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("contractType"); 
            } 

            ChannelFactory factory = null; 
            bool factoryFailed = true;

            try
            { 
                ContractInfo contractInfo = GetContractInfo(contractType);
                Type channelFactoryType = contractInfo.ChannelFactoryType; 
                object[] args = null; 

                EndpointAddress key = BuildCacheAddress(endpointName, contractType); 
                ServiceEndpoint endpoint = null;

                if (codeEndpoints != null &&
                    codeEndpoints.TryGetValue(key, out endpoint) && 
                    !IsEndpointDefinedInConfiguration(endpointName, contractType))
                { 
                    args = new object[] { endpoint }; 
                }
                else 
                {
                    args = new object[] { endpointName ?? string.Empty };
                }
 
                factory = Activator.CreateInstance(channelFactoryType, args) as ChannelFactory;
                factory.Open(); 
 
                factoryFailed = false;
            } 
            catch (TargetInvocationException exception)
            {
                if (exception.InnerException != null)
                { 
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(exception.InnerException);
                } 
 
                throw;
            } 
            finally
            {
                if (factory != null && factoryFailed)
                { 
                    factory.Abort();
                } 
            } 

            return factory; 
        }

        public static bool IsEndpointDefinedInConfiguration(string endpointName, Type contractType)
        { 
            if (string.IsNullOrEmpty(endpointName))
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("endpointName"); 
            }
 
            if (contractType == null)
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("contractType");
            } 

            bool wildcard = string.Equals(endpointName, "*", StringComparison.Ordinal); 
 
            ClientSection section = ClientSection.GetSection();
            foreach (ChannelEndpointElement element in section.Endpoints) 
            {
                if ((!wildcard && (element.Name != endpointName)) || (element.Contract != contractType.FullName))
                {
                    continue; 
                }
                return true; 
            } 

            return false; 
        }

        public static bool IsSessionlessContract(Type contractType)
        { 
            return GetContractInfo(contractType).IsSessionless;
        } 
 
        static ContractInfo GetContractInfo(Type contractType)
        { 
            ContractInfo contractInfo = contractInfoCollection[contractType] as ContractInfo;
            if (contractInfo == null)
            {
                lock (thisLock) 
                {
                    contractInfo = contractInfoCollection[contractType] as ContractInfo; 
                    if (contractInfo == null) 
                    {
                        contractInfo = new ContractInfo(contractType); 
                        contractInfoCollection.Add(contractType, contractInfo);
                    }
                }
            } 

            return contractInfo; 
        } 

        class ContractInfo 
        {
            Type channelFactoryType;
            Type contractType;
            MethodInfo createChannelMethodInfo; 
            MethodInfo createChannelWithCustomAddressMethodInfo;
            bool isSessionless; 
 
            public ContractInfo(Type contractType)
            { 
                this.contractType = contractType;

                Type[] typeArguments = new Type[] { contractType };
                this.channelFactoryType = typeof(ChannelFactory < > ).MakeGenericType(typeArguments); 

                this.createChannelMethodInfo = this.channelFactoryType.GetMethod("CreateChannel", new Type[0] { }); 
                this.createChannelWithCustomAddressMethodInfo = this.channelFactoryType.GetMethod("CreateChannel", new Type[1] { typeof(EndpointAddress) }); 

                this.isSessionless = (ContractDescription.GetContract(contractType).SessionMode == SessionMode.NotAllowed); 
            }

            public Type ChannelFactoryType
            { 
                get
                { 
                    return this.channelFactoryType; 
                }
            } 

            public MethodInfo CreateChannelMethodInfo
            {
                get 
                {
                    return this.createChannelMethodInfo; 
                } 
            }
 
            public MethodInfo CreateChannelWithCustomAddressMethodInfo
            {
                get
                { 
                    return this.createChannelWithCustomAddressMethodInfo;
                } 
            } 

            public bool IsSessionless 
            {
                get
                {
                    return this.isSessionless; 
                }
            } 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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ChannelManagerHelpers.cs source code in C# .NET

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