InstanceBehavior.cs source code in C# .NET

                        Code:
                         / WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / ServiceModel / System / ServiceModel / Dispatcher / InstanceBehavior.cs / 1 / InstanceBehavior.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------

namespace System.ServiceModel.Dispatcher 
{
    using System; 
    using System.Diagnostics; 
    using System.ServiceModel.Channels;
    using System.ServiceModel; 
    using System.Reflection;
    using System.Globalization;
    using System.Threading;
    using System.ServiceModel.Diagnostics; 

    class InstanceBehavior 
    { 
        const BindingFlags DefaultBindingFlags =
        BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Public; 

        bool useSession;
        ServiceHostBase host;
        IInstanceContextInitializer[] initializers; 
        IInstanceContextProvider instanceContextProvider;
        IInstanceProvider provider; 
        InstanceContext singleton; 
        bool transactionAutoCompleteOnSessionClose = false;
        bool releaseServiceInstanceOnTransactionComplete = true; 
        bool isSynchronized = false;
        ImmutableDispatchRuntime immutableRuntime;

        internal InstanceBehavior(DispatchRuntime dispatch, ImmutableDispatchRuntime immutableRuntime) 
        {
            this.useSession = dispatch.ChannelDispatcher.Session; 
            this.immutableRuntime = immutableRuntime; 
            this.host = (dispatch.ChannelDispatcher == null) ? null : dispatch.ChannelDispatcher.Host;
            this.initializers = EmptyArray.ToArray(dispatch.InstanceContextInitializers); 
            this.provider = dispatch.InstanceProvider;
            this.singleton = dispatch.SingletonInstanceContext;
            this.transactionAutoCompleteOnSessionClose = dispatch.TransactionAutoCompleteOnSessionClose;
            this.releaseServiceInstanceOnTransactionComplete = dispatch.ReleaseServiceInstanceOnTransactionComplete; 
            this.isSynchronized = (dispatch.ConcurrencyMode != ConcurrencyMode.Multiple);
            this.instanceContextProvider = dispatch.InstanceContextProvider; 
 
            if (this.provider == null)
            { 
                ConstructorInfo constructor = null;

                if (dispatch.Type != null)
                    constructor = InstanceBehavior.GetConstructor(dispatch.Type); 

                if (this.singleton == null) 
                { 
                    if (dispatch.Type != null && (dispatch.Type.IsAbstract || dispatch.Type.IsInterface))
                        throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.SFxServiceTypeNotCreatable))); 

                    if (constructor == null)
                        throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.SFxNoDefaultConstructor)));
                } 

                if (constructor != null) 
                { 
                    if(this.singleton == null || !this.singleton.IsWellKnown)
                    { 
                        InvokerUtil util = new InvokerUtil();
                        CreateInstanceDelegate creator = util.GenerateCreateInstanceDelegate(dispatch.Type, constructor);
                        this.provider = new InstanceProvider(creator);
                    } 
                }
            } 
 
            if (this.singleton != null)
            { 
                this.singleton.Behavior = this;
            }
        }
 
        internal bool TransactionAutoCompleteOnSessionClose
        { 
            get 
            {
                return this.transactionAutoCompleteOnSessionClose; 
            }
        }

        internal bool ReleaseServiceInstanceOnTransactionComplete 
        {
            get 
            { 
                return this.releaseServiceInstanceOnTransactionComplete;
            } 
        }

        internal IInstanceContextProvider InstanceContextProvider
        { 
            get
            { 
                return this.instanceContextProvider; 
            }
        } 

        internal void AfterReply(ref MessageRpc rpc, ErrorBehavior error)
        {
            InstanceContext context = rpc.InstanceContext; 

            if (context != null) 
            { 
                try
                { 
                    if (rpc.Operation.ReleaseInstanceAfterCall)
                    {
                        if (context.State == CommunicationState.Opened)
                        { 
                            context.ReleaseServiceInstance();
                        } 
                    } 
                    else if(releaseServiceInstanceOnTransactionComplete &&
                            this.isSynchronized && 
                            rpc.transaction != null &&
                            (rpc.transaction.IsCompleted || (rpc.Error != null)))
                    {
                        if (context.State == CommunicationState.Opened) 
                        {
                            context.ReleaseServiceInstance(); 
                        } 
                        if(DiagnosticUtility.ShouldTraceInformation)
                        { 
                            DiagnosticUtility.DiagnosticTrace.TraceEvent(TraceEventType.Information,
                                                                         TraceCode.TxReleaseServiceInstanceOnCompletion,
                                                                         SR.GetString(SR.TraceCodeTxReleaseServiceInstanceOnCompletion, "*"));
                        } 
                    }
                } 
                catch (Exception e) 
                {
                    if (DiagnosticUtility.IsFatal(e)) 
                    {
                        throw;
                    }
                    error.HandleError(e); 
                }
 
                try 
                {
                    context.UnbindRpc(ref rpc); 
                }
                catch (Exception e)
                {
                    if (DiagnosticUtility.IsFatal(e)) 
                    {
                        throw; 
                    } 
                    error.HandleError(e);
                } 
            }
        }

        internal bool CanUnload(InstanceContext instanceContext) 
        {
            if (InstanceContextProviderBase.IsProviderSingleton(this.instanceContextProvider)) 
                return false; 

            if(InstanceContextProviderBase.IsProviderPerCall(this.instanceContextProvider) || 
                InstanceContextProviderBase.IsProviderSessionful(this.instanceContextProvider))
                return true;

            //User provided InstanceContextProvider. Call the provider to check for idle. 
            if (!this.instanceContextProvider.IsIdle(instanceContext))
            { 
                this.instanceContextProvider.NotifyIdle(InstanceContext.NotifyIdleCallback, instanceContext); 
                return false;
            } 
            return true;
        }

        internal void EnsureInstanceContext(ref MessageRpc rpc) 
        {
            if (rpc.InstanceContext == null) 
            { 
                rpc.InstanceContext = new InstanceContext(rpc.Host, false);
                rpc.InstanceContext.ServiceThrottle = rpc.channelHandler.InstanceContextServiceThrottle; 
                rpc.MessageRpcOwnsInstanceContextThrottle = false;
            }

            rpc.OperationContext.SetInstanceContext(rpc.InstanceContext); 
            rpc.InstanceContext.Behavior = this;
 
            if (rpc.InstanceContext.State == CommunicationState.Created) 
            {
                lock (rpc.InstanceContext.ThisLock) 
                {
                    if (rpc.InstanceContext.State == CommunicationState.Created)
                    {
                        rpc.InstanceContext.Open(rpc.Channel.CloseTimeout); 
                    }
                } 
            } 
            rpc.InstanceContext.BindRpc(ref rpc);
        } 

        static ConstructorInfo GetConstructor(Type type)
        {
            return type.GetConstructor(DefaultBindingFlags, null, Type.EmptyTypes, null); 
        }
 
        internal object GetInstance(InstanceContext instanceContext) 
        {
            if (this.provider == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.SFxNoDefaultConstructor)));
            }
 
            return this.provider.GetInstance(instanceContext);
        } 
 
        internal object GetInstance(InstanceContext instanceContext, Message request)
        { 
            if (this.provider == null)
            {
                throw TraceUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.SFxNoDefaultConstructor)), request);
            } 

            return this.provider.GetInstance(instanceContext, request); 
        } 

        internal void Initialize(InstanceContext instanceContext) 
        {
            OperationContext current = OperationContext.Current;
            Message message = (current != null) ? current.IncomingMessage : null;
 
            if (current != null && current.InternalServiceChannel != null)
            { 
                IContextChannel transparentProxy = (IContextChannel)current.InternalServiceChannel.Proxy; 
                this.instanceContextProvider.InitializeInstanceContext(instanceContext, message, transparentProxy);
            } 

            for (int i = 0; i < this.initializers.Length; i++)
                this.initializers[i].Initialize(instanceContext, message);
        } 

        internal void ReleaseBefore(ref MessageRpc rpc) 
        { 
            if (rpc.Operation.ReleaseInstanceBeforeCall)
            { 
                rpc.InstanceContext.ReleaseServiceInstance();
            }
        }
 
        internal void ReleaseInstance(InstanceContext instanceContext, object instance)
        { 
            if (this.provider != null) 
            {
                try 
                {
                    this.provider.ReleaseInstance(instanceContext, instance);
                }
                catch (Exception e) 
                {
                    if (DiagnosticUtility.IsFatal(e)) 
                    { 
                        throw;
                    } 

                    this.immutableRuntime.ErrorBehavior.HandleError(e);
                }
            } 
        }
 
        class InstanceProvider : IInstanceProvider 
        {
            CreateInstanceDelegate creator; 

            internal InstanceProvider(CreateInstanceDelegate creator)
            {
                if (creator == null) 
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("creator");
 
                this.creator = creator; 
            }
 
            public object GetInstance(InstanceContext instanceContext)
            {
                return this.creator();
            } 

            public object GetInstance(InstanceContext instanceContext, Message message) 
            { 
                return this.creator();
            } 

            public void ReleaseInstance(InstanceContext instanceContext, object instance)
            {
                IDisposable dispose = instance as IDisposable; 
                if (dispose != null)
                    dispose.Dispose(); 
            } 
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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InstanceBehavior.cs source code in C# .NET

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