AssemblyCache.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Metadata / ObjectLayer / AssemblyCache.cs / 1305376 / AssemblyCache.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner       [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System.Collections.Generic; 
using System.Data.Common.Utils;
using System.Diagnostics;
using System.Reflection;
 
namespace System.Data.Metadata.Edm
{ 
    internal static class AssemblyCache 
    {
        // Global Assembly Cache 
        private readonly static Dictionary s_globalAssemblyCache = new Dictionary();
        private static object _assemblyCacheLock = new object();

        //List of assemblies having view gen attribute. We cache these things if we discover 
        //these assemblies while looking for O-space metadata.
        private static IList s_viewGenAssemblies = new ThreadSafeList(); 
 
        internal static LockedAssemblyCache AquireLockedAssemblyCache()
        { 
            return new LockedAssemblyCache(_assemblyCacheLock, s_globalAssemblyCache);
        }

        internal static void LoadAssembly(Assembly assembly, bool loadReferencedAssemblies, 
            KnownAssembliesSet knownAssemblies, out Dictionary typesInLoading, out List errors)
        { 
            object loaderCookie = null; 
            LoadAssembly(assembly, loadReferencedAssemblies, knownAssemblies, null, null, ref loaderCookie, out typesInLoading, out errors);
        } 

        internal static void LoadAssembly(Assembly assembly, bool loadReferencedAssemblies,
            KnownAssembliesSet knownAssemblies, EdmItemCollection edmItemCollection, Action logLoadMessage, ref object loaderCookie, out Dictionary typesInLoading, out List errors)
        { 
            Debug.Assert(loaderCookie == null || loaderCookie is Func, "This is a bad loader cookie");
            typesInLoading = null; 
            errors = null; 

            using (LockedAssemblyCache lockedAssemblyCache = AssemblyCache.AquireLockedAssemblyCache()) 
            {
                ObjectItemLoadingSessionData loadingData = new ObjectItemLoadingSessionData(knownAssemblies, lockedAssemblyCache, edmItemCollection, logLoadMessage, loaderCookie);

                LoadAssembly(assembly, loadReferencedAssemblies, loadingData); 
                loaderCookie = loadingData.LoaderCookie;
                // resolve references to top level types (base types, navigation properties returns and associations, and complex type properties) 
                loadingData.CompleteSession(); 

                if (loadingData.EdmItemErrors.Count == 0) 
                {
                    // do the validation for the all the new types
                    // Now, perform validation on all the new types
                    EdmValidator validator = new EdmValidator(); 
                    validator.SkipReadOnlyItems = true;
                    validator.Validate(loadingData.TypesInLoading.Values, loadingData.EdmItemErrors); 
                    // Update the global cache if there are no errors 
                    if (loadingData.EdmItemErrors.Count == 0)
                    { 
                        if (ObjectItemAssemblyLoader.IsAttributeLoader(loadingData.ObjectItemAssemblyLoaderFactory))
                        {
                            // we only cache items from the attribute loader globally, the
                            // items loaded by convention will change depending on the cspace 
                            // provided.  cspace will have a cache of it's own for assemblies
                            UpdateCache(lockedAssemblyCache, loadingData.AssembliesLoaded); 
                        } 
                        else if (loadingData.EdmItemCollection != null &&
                                ObjectItemAssemblyLoader.IsConventionLoader(loadingData.ObjectItemAssemblyLoaderFactory)) 
                        {
                            UpdateCache(loadingData.EdmItemCollection, loadingData.AssembliesLoaded);
                        }
                    } 
                }
 
                if (loadingData.TypesInLoading.Count > 0) 
                {
                    foreach (EdmType edmType in loadingData.TypesInLoading.Values) 
                    {
                        edmType.SetReadOnly();
                    }
                } 

                // Update the out parameters once you are done with loading 
                typesInLoading = loadingData.TypesInLoading; 
                errors = loadingData.EdmItemErrors;
            } 
        }

        private static void LoadAssembly(Assembly assembly, bool loadReferencedAssemblies, ObjectItemLoadingSessionData loadingData)
        { 
            // Check if the assembly is already loaded
            KnownAssemblyEntry entry; 
            bool shouldLoadReferences = false; 
            if (loadingData.KnownAssemblies.TryGetKnownAssembly(assembly, loadingData.ObjectItemAssemblyLoaderFactory, loadingData.EdmItemCollection, out entry))
            { 
                shouldLoadReferences = !entry.ReferencedAssembliesAreLoaded && loadReferencedAssemblies;
            }
            else
            { 
                ObjectItemAssemblyLoader loader = ObjectItemAssemblyLoader.CreateLoader(assembly, loadingData);
                loader.Load(); 
                shouldLoadReferences = loadReferencedAssemblies; 
            }
 
            if (shouldLoadReferences)
            {
                if (entry == null && loadingData.KnownAssemblies.TryGetKnownAssembly(assembly, loadingData.ObjectItemAssemblyLoaderFactory, loadingData.EdmItemCollection, out entry) ||
                    entry != null) 
                {
                    entry.ReferencedAssembliesAreLoaded = true; 
                } 
                Debug.Assert(entry != null, "we should always have an entry, why don't we?");
 
                // We will traverse through all the statically linked assemblies and their dependencies.
                // Only assemblies with the EdmSchemaAttribute will be loaded and rest will be ignored

                // Even if the schema attribute is missing, we should still check all the dependent assemblies 
                // any of the dependent assemblies can have the schema attribute
 
                // After the given assembly has been loaded, check on the flag in _knownAssemblies to see if it has already 
                // been recursively loaded. The flag can be true if it was already loaded before this function was called
                foreach (Assembly referencedAssembly in MetadataAssemblyHelper.GetNonSystemReferencedAssemblies(assembly)) 
                {
                    // filter out "known" assemblies to prevent unnecessary loading
                    EntityBid.Trace(" loadededAssembly='%ls'\n", referencedAssembly.FullName);
                    // recursive call 
                    LoadAssembly(referencedAssembly, loadReferencedAssemblies, loadingData);
                } 
            } 
        }
 

        private static void UpdateCache(EdmItemCollection edmItemCollection, Dictionary assemblies)
        {
            foreach (var entry in assemblies) 
            {
                edmItemCollection.ConventionalOcCache.AddAssemblyToOcCacheFromAssemblyCache( 
                    entry.Key, new ImmutableAssemblyCacheEntry(entry.Value)); 
            }
        } 

        private static void UpdateCache(LockedAssemblyCache lockedAssemblyCache, Dictionary assemblies)
        {
 
            foreach (KeyValuePair entry in assemblies)
            { 
                // Add all the assemblies from the loading context to the global cache 
                lockedAssemblyCache.Add(entry.Key, new ImmutableAssemblyCacheEntry(entry.Value));
            } 
        }

        internal static IList ViewGenerationAssemblies
        { 
            get
            { 
                return s_viewGenAssemblies; 
            }
        } 
    }
}

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

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