WorkflowHostingEndpoint.cs source code in C# .NET

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                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / System.ServiceModel.Activities / System / ServiceModel / Activities / WorkflowHostingEndpoint.cs / 1305376 / WorkflowHostingEndpoint.cs
                        
                        
                            //---------------------------------------------------------------- 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//---------------------------------------------------------------

namespace System.ServiceModel.Activities 
{
    using System.Activities; 
    using System.Collections.Generic; 
    using System.Collections.ObjectModel;
    using System.Diagnostics.CodeAnalysis; 
    using System.Globalization;
    using System.Runtime;
    using System.ServiceModel.Activities.Description;
    using System.ServiceModel.Activities.Dispatcher; 
    using System.ServiceModel.Channels;
    using System.ServiceModel.Description; 
    using System.ServiceModel.Dispatcher; 

    public abstract class WorkflowHostingEndpoint : ServiceEndpoint 
    {
        Collection correlationQueries;

        protected WorkflowHostingEndpoint(Type contractType) 
            : this(contractType, null, null)
        { 
        } 

        protected WorkflowHostingEndpoint(Type contractType, Binding binding, EndpointAddress address) 
            : base(ContractDescription.GetContract(contractType), binding, address)
        {
            this.IsSystemEndpoint = true;
            this.Contract.Behaviors.Add(new ServiceMetadataContractBehavior(false)); 
            this.Contract.Behaviors.Add(new WorkflowHostingContractBehavior());
            Fx.Assert(!this.Behaviors.Contains(typeof(CorrelationQueryBehavior)), "Must not contain correlation query!"); 
            this.correlationQueries = new Collection(); 
            this.Behaviors.Add(new CorrelationQueryBehavior(this.correlationQueries));
 
            // If TransactionFlowOption.Allowed or TransactionFlowOption.Mandatory is defined on an operation, we will set
            // TransactionScopeRequired = true for that operation.  The operation will become transacted (use transaction flow,
            // or create one locally).  For usability reason, we assume this is the majority usage.  User could opt out by
            // setting TransactionScopeRequired to false or remove the TransactionFlowAttribute from the operation. 
            foreach (OperationDescription operationDescription in this.Contract.Operations)
            { 
                TransactionFlowAttribute transactionFlow = operationDescription.Behaviors.Find(); 
                if (transactionFlow != null && transactionFlow.Transactions != TransactionFlowOption.NotAllowed)
                { 
                    OperationBehaviorAttribute operationAttribute = operationDescription.Behaviors.Find();
                    operationAttribute.TransactionScopeRequired = true;
                }
            } 
        }
 
        public Collection CorrelationQueries 
        {
            get { return this.correlationQueries; } 
        }

        // There are two main scenario that user will override this api.
        // - For ResumeBookmark, User explicitly put or know how to extract InstanceId from Message.  This enables user to provide 
        //   customized and lighter-weight (no InstanceKeys indirection) correlation.
        // - For Workflow Creation, User could provide a preferred Id for newly created Workflow Instance. 
        protected internal virtual Guid OnGetInstanceId(object[] inputs, OperationContext operationContext) 
        {
            return Guid.Empty; 
        }

        protected internal virtual WorkflowCreationContext OnGetCreationContext(
            object[] inputs, OperationContext operationContext, 
            Guid instanceId, WorkflowHostingResponseContext responseContext)
        { 
            return null; 
        }
 
        [SuppressMessage(FxCop.Category.Design, FxCop.Rule.AvoidOutParameters,
            Justification = "By design, return both Bookmark and its payload.")]
        protected internal virtual Bookmark OnResolveBookmark(object[] inputs, OperationContext operationContext,
            WorkflowHostingResponseContext responseContext, out object value) 
        {
            value = null; 
            return null; 
        }
 
        internal static FaultException CreateDispatchFaultException()
        {
            FaultCode code = new FaultCode(FaultCodeConstants.Codes.InternalServiceFault, FaultCodeConstants.Namespaces.NetDispatch);
            code = FaultCode.CreateReceiverFaultCode(code); 
            MessageFault dispatchFault = MessageFault.CreateFault(code,
                    new FaultReason(new FaultReasonText(SR.InternalServerError, CultureInfo.CurrentCulture))); 
            return new FaultException(dispatchFault, FaultCodeConstants.Actions.NetDispatcher); 
        }
 
        class WorkflowHostingContractBehavior : IContractBehavior
        {
            public void AddBindingParameters(ContractDescription contractDescription, ServiceEndpoint endpoint, BindingParameterCollection bindingParameters)
            { 
            }
 
            public void ApplyClientBehavior(ContractDescription contractDescription, ServiceEndpoint endpoint, ClientRuntime clientRuntime) 
            {
            } 

            public void ApplyDispatchBehavior(ContractDescription contractDescription, ServiceEndpoint endpoint, DispatchRuntime dispatchRuntime)
            {
                Fx.Assert(endpoint is WorkflowHostingEndpoint, "Must be hosting endpoint!"); 
                foreach (OperationDescription operation in contractDescription.Operations)
                { 
                    if (operation.Behaviors.Find() == null) 
                    {
                        operation.Behaviors.Add(new WorkflowHostingOperationBehavior((WorkflowHostingEndpoint)endpoint)); 
                    }
                }
            }
 
            public void Validate(ContractDescription contractDescription, ServiceEndpoint endpoint)
            { 
                Fx.Assert(endpoint is WorkflowHostingEndpoint, "Must be hosting endpoint!"); 
            }
 
            class WorkflowHostingOperationBehavior : WorkflowOperationBehavior
            {
                WorkflowHostingEndpoint hostingEndpoint;
 
                public WorkflowHostingOperationBehavior(WorkflowHostingEndpoint hostingEndpoint)
                    : base(true) 
                { 
                    this.hostingEndpoint = hostingEndpoint;
                } 

                protected internal override Bookmark OnResolveBookmark(WorkflowOperationContext context, out BookmarkScope bookmarkScope, out object value)
                {
                    CorrelationMessageProperty correlationMessageProperty; 
                    if (CorrelationMessageProperty.TryGet(context.OperationContext.IncomingMessageProperties, out correlationMessageProperty))
                    { 
                        bookmarkScope = new BookmarkScope(correlationMessageProperty.CorrelationKey.Value); 
                    }
                    else 
                    {
                        bookmarkScope = null;
                    }
 
                    WorkflowHostingResponseContext responseContext = new WorkflowHostingResponseContext(context);
                    Bookmark bookmark = this.hostingEndpoint.OnResolveBookmark(context.Inputs, context.OperationContext, responseContext, out value); 
                    if (bookmark == null) 
                    {
                        throw FxTrace.Exception.AsError(CreateDispatchFaultException()); 
                    }
                    return bookmark;
                }
            } 
        }
    } 
} 


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

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