WorkflowServiceHostFactory.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / System.ServiceModel.Activation / System / ServiceModel / Activities / Activation / WorkflowServiceHostFactory.cs / 1305376 / WorkflowServiceHostFactory.cs
                        
                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------
namespace System.ServiceModel.Activities.Activation
{ 
    using System.Activities;
    using System.Activities.XamlIntegration; 
    using System.IO; 
    using System.Globalization;
    using System.Reflection; 
    using System.Runtime;
    using System.Runtime.DurableInstancing;
    using System.Security;
    using System.Security.Permissions; 
    using System.ServiceModel.Activation;
    using System.Web; 
    using System.Web.Compilation; 
    using System.Web.Hosting;
    using System.Xaml; 
    using System.Xml;
    using System.Xml.Linq;

    public class WorkflowServiceHostFactory : ServiceHostFactoryBase 
    {
        public override ServiceHostBase CreateServiceHost(string constructorString, Uri[] baseAddresses) 
        { 
            WorkflowServiceHost serviceHost = null;
 
            if (string.IsNullOrEmpty(constructorString))
            {
                throw FxTrace.Exception.AsError(new InvalidOperationException(SR.WorkflowServiceHostFactoryConstructorStringNotProvided));
            } 

            if (baseAddresses == null) 
            { 
                throw FxTrace.Exception.ArgumentNull("baseAddresses");
            } 

            if (baseAddresses.Length == 0)
            {
                throw FxTrace.Exception.AsError(new InvalidOperationException(SR.BaseAddressesNotProvided)); 
            }
 
            if (!HostingEnvironment.IsHosted) 
            {
                throw FxTrace.Exception.AsError(new InvalidOperationException(SR.Hosting_ProcessNotExecutingUnderHostedContext("WorkflowServiceHostFactory.CreateServiceHost"))); 
            }

            // We expect most users will use .xamlx file instead of precompiled assembly
            // Samples of xamlVirtualPath under all scenarios 
            //                          constructorString  XamlFileBaseLocation    xamlVirtualPath
            // 1. Xamlx direct          ~/sub/a.xamlx      ~/sub/                  ~/sub/a.xamlx 
            // 2. CBA with precompiled  servicetypeinfo    ~/sub/servicetypeinfo   ~/sub/servicetypeinfo  * no file will be found 
            // 3. CBA with xamlx        sub/a.xamlx        ~/                      ~/sub/a.xamlx
            // 4. Svc with precompiled  servicetypeinfo    ~/sub/servicetypeinfo   ~/sub/servicetypeinfo  * no file will be found 
            // 5. Svc with Xamlx        ../a.xamlx         ~/sub/                  ~/a.xamlx

            string xamlVirtualPath = VirtualPathUtility.Combine(AspNetEnvironment.Current.XamlFileBaseLocation, constructorString);
            Stream activityStream; 
            string compiledCustomString;
            if (GetServiceFileStreamOrCompiledCustomString(xamlVirtualPath, baseAddresses, out activityStream, out compiledCustomString)) 
            { 
                object serviceObject;
 
                using (activityStream)
                {
                    //
 
                    BuildManager.GetReferencedAssemblies();
                    //XmlnsMappingHelper.EnsureMappingPassed(); 
 
                    XamlXmlReaderSettings xamlXmlReaderSettings = new XamlXmlReaderSettings();
                    xamlXmlReaderSettings.ProvideLineInfo = true; 
                    XamlReader wrappedReader = ActivityXamlServices.CreateReader(new XamlXmlReader(XmlReader.Create(activityStream), xamlXmlReaderSettings));
                    if (TD.XamlServicesLoadStartIsEnabled())
                    {
                        TD.XamlServicesLoadStart(); 
                    }
                    serviceObject = XamlServices.Load(wrappedReader); 
                    if (TD.XamlServicesLoadStopIsEnabled()) 
                    {
                        TD.XamlServicesLoadStop(); 
                    }
                }

                WorkflowService service = null; 
                if (serviceObject is Activity)
                { 
                    service = new WorkflowService 
                    {
                        Body = (Activity)serviceObject 
                    };
                }
                else if (serviceObject is WorkflowService)
                { 
                    service = (WorkflowService)serviceObject;
                } 
 
                // If name of the service is not set
                // service name = xaml file name with extension 
                // service namespace = IIS virtual path
                // service config name = Activity.DisplayName
                if (service != null)
                { 
                    if (service.Name == null)
                    { 
                        string serviceName = VirtualPathUtility.GetFileName(xamlVirtualPath); 
                        string serviceNamespace = String.Format(CultureInfo.InvariantCulture, "/{0}{1}", ServiceHostingEnvironment.SiteName, VirtualPathUtility.GetDirectory(ServiceHostingEnvironment.FullVirtualPath));
                        service.Name = XName.Get(XmlConvert.EncodeLocalName(serviceName), serviceNamespace); 

                        if (service.ConfigurationName == null && service.Body != null)
                        {
                            service.ConfigurationName = XmlConvert.EncodeLocalName(service.Body.DisplayName); 
                        }
                    } 
 
                    serviceHost = CreateWorkflowServiceHost(service, baseAddresses);
                } 
            }
            else
            {
                Type activityType = this.GetTypeFromAssembliesInCurrentDomain(constructorString); 
                if (null == activityType)
                { 
                    activityType = GetTypeFromCompileCustomString(compiledCustomString, constructorString); 
                }
                if (null == activityType) 
                {
                    //for file-less cases, try in referenced assemblies as CompileCustomString assemblies are empty.
                    BuildManager.GetReferencedAssemblies();
                    activityType = this.GetTypeFromAssembliesInCurrentDomain(constructorString); 
                }
                if (null != activityType) 
                { 
                    if (!TypeHelper.AreTypesCompatible(activityType, typeof(Activity)))
                    { 
                        throw FxTrace.Exception.AsError(new InvalidOperationException(SR.TypeNotActivity(activityType.FullName)));
                    }

                    Activity activity = (Activity)Activator.CreateInstance(activityType); 
                    serviceHost = CreateWorkflowServiceHost(activity, baseAddresses);
                } 
            } 
            if (serviceHost == null)
            { 
                throw FxTrace.Exception.AsError(
                    new InvalidOperationException(SR.CannotResolveConstructorStringToWorkflowType(constructorString)));
            }
 
            //The Description.Name and Description.NameSpace aren't included intentionally - because
            //in farm scenarios the sole and unique identifier is the service deployment URL 
            ((IDurableInstancingOptions)serviceHost.DurableInstancingOptions).SetScopeName( 
                XName.Get(XmlConvert.EncodeLocalName(VirtualPathUtility.GetFileName(ServiceHostingEnvironment.FullVirtualPath)),
                String.Format(CultureInfo.InvariantCulture, "/{0}{1}", ServiceHostingEnvironment.SiteName, VirtualPathUtility.GetDirectory(ServiceHostingEnvironment.FullVirtualPath)))); 

            return serviceHost;
        }
 
        Type GetTypeFromAssembliesInCurrentDomain(string typeString)
        { 
            Type activityType = Type.GetType(typeString, false); 
            if (null == activityType)
            { 
                foreach (Assembly assembly in AppDomain.CurrentDomain.GetAssemblies())
                {
                    activityType = assembly.GetType(typeString, false);
                    if (null != activityType) 
                    {
                        break; 
                    } 
                }
            } 
            return activityType;
        }

        Type GetTypeFromCompileCustomString(string compileCustomString, string typeString) 
        {
            if (string.IsNullOrEmpty(compileCustomString)) 
            { 
                return null;
            } 
            string[] components = compileCustomString.Split('|');
            if (components.Length < 3)
            {
                throw FxTrace.Exception.AsError(new InvalidOperationException(SR.InvalidCompiledString(compileCustomString))); 
            }
            Type activityType = null; 
            for (int i = 3; i < components.Length; i++) 
            {
                Assembly assembly = Assembly.Load(components[i]); 
                activityType = assembly.GetType(typeString, false);
                if (activityType != null)
                {
                    break; 
                }
            } 
            return activityType; 
        }
 
        protected virtual WorkflowServiceHost CreateWorkflowServiceHost(Activity activity, Uri[] baseAddresses)
        {
            return new WorkflowServiceHost(activity, baseAddresses);
        } 

        protected virtual WorkflowServiceHost CreateWorkflowServiceHost(WorkflowService service, Uri[] baseAddresses) 
        { 
            return new WorkflowServiceHost(service, baseAddresses);
        } 

        // The code is optimized for reducing impersonation
        // true means serviceFileStream has been set; false means CompiledCustomString has been set
        [Fx.Tag.SecurityNote(Critical = "Calls SecurityCritical method HostingEnvironmentWrapper.UnsafeImpersonate().", 
            Safe = "Demands unmanaged code permission, disposes impersonation context in a finally, and tightly scopes the usage of the umpersonation token.")]
        [SecurityPermission(SecurityAction.Demand, UnmanagedCode = true)] 
        [SecuritySafeCritical] 
        bool GetServiceFileStreamOrCompiledCustomString(string virtualPath, Uri[] baseAddresses, out Stream serviceFileStream, out string compiledCustomString)
        { 
            IDisposable unsafeImpersonate = null;
            compiledCustomString = null;
            serviceFileStream = null;
            try 
            {
                try 
                { 
                    try
                    { 
                    }
                    finally
                    {
                        unsafeImpersonate = HostingEnvironmentWrapper.UnsafeImpersonate(); 
                    }
                    if (HostingEnvironment.VirtualPathProvider.FileExists(virtualPath)) 
                    { 
                        serviceFileStream = HostingEnvironment.VirtualPathProvider.GetFile(virtualPath).Open();
                        return true; 
                    }
                    else
                    {
                        if (!AspNetEnvironment.Current.IsConfigurationBased) 
                        {
                            compiledCustomString = BuildManager.GetCompiledCustomString(baseAddresses[0].AbsolutePath); 
                        } 
                        return false;
                    } 
                }
                finally
                {
                    if (null != unsafeImpersonate) 
                    {
                        unsafeImpersonate.Dispose(); 
                    } 
                }
            } 
            catch
            {
                throw;
            } 
        }
    } 
} 

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

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