1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
//---------------------------------------------------------------------
// <copyright file="AssemblyCache.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//
// @owner Microsoft
// @backupOwner Microsoft
//---------------------------------------------------------------------
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<Assembly, ImmutableAssemblyCacheEntry> s_globalAssemblyCache = new Dictionary<Assembly, ImmutableAssemblyCacheEntry>();
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<Assembly> s_viewGenAssemblies = new ThreadSafeList<Assembly>();
internal static LockedAssemblyCache AquireLockedAssemblyCache()
{
return new LockedAssemblyCache(_assemblyCacheLock, s_globalAssemblyCache);
}
internal static void LoadAssembly(Assembly assembly, bool loadReferencedAssemblies,
KnownAssembliesSet knownAssemblies, out Dictionary<string, EdmType> typesInLoading, out List<EdmItemError> 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<String> logLoadMessage, ref object loaderCookie, out Dictionary<string, EdmType> typesInLoading, out List<EdmItemError> errors)
{
Debug.Assert(loaderCookie == null || loaderCookie is Func<Assembly, ObjectItemLoadingSessionData, ObjectItemAssemblyLoader>, "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
// recursive call
LoadAssembly(referencedAssembly, loadReferencedAssemblies, loadingData);
}
}
}
private static void UpdateCache(EdmItemCollection edmItemCollection, Dictionary<Assembly, MutableAssemblyCacheEntry> assemblies)
{
foreach (var entry in assemblies)
{
edmItemCollection.ConventionalOcCache.AddAssemblyToOcCacheFromAssemblyCache(
entry.Key, new ImmutableAssemblyCacheEntry(entry.Value));
}
}
private static void UpdateCache(LockedAssemblyCache lockedAssemblyCache, Dictionary<Assembly, MutableAssemblyCacheEntry> assemblies)
{
foreach (KeyValuePair<Assembly, MutableAssemblyCacheEntry> 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<Assembly> ViewGenerationAssemblies
{
get
{
return s_viewGenAssemblies;
}
}
}
}
|
