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Only call GetTypes() once for each assembly

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All types with a GTypeNameAttribute are stored in a Dictionary
This commit is contained in:
Maarten Bosmans 2009-12-24 23:30:50 +01:00 committed by Sebastian Dröge
parent 0ab40256cd
commit 7cd7afbfa6
1 changed files with 29 additions and 33 deletions
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62
gstreamer-sharp/Application.cs
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@ -58,62 +58,58 @@ namespace Gst {
gst_deinit();
}
private static Dictionary<string,bool> AssemblyReferencesGstreamerSharp = new Dictionary<string,bool> ();
private static Dictionary<int,bool> AssemblyTypesInCache = new Dictionary<int,bool> ();
private static Dictionary<string,Type> TypeCache = new Dictionary<string,Type> ();
private static bool CheckAssemblyReferences (Assembly asm)
// Recursively check for types with GTypeNameAttribute and put them in TypeCache,
// but only gstreamer-sharp is in the chain of referenced assemblies.
private static bool PutAssemblyTypesInCache (Assembly asm)
{
bool result = false;
AssemblyName asm_name = asm.GetName ();
bool result;
// If already visited, return immediately
if (AssemblyReferencesGstreamerSharp.ContainsKey (asm_name.FullName))
return AssemblyReferencesGstreamerSharp[asm_name.FullName];
if (AssemblyTypesInCache.TryGetValue(asm.GetHashCode (), out result))
return result;
AssemblyReferencesGstreamerSharp.Add (asm_name.FullName, false);
result = false;
AssemblyTypesInCache.Add (asm.GetHashCode (), false);
// Result is true for gstreamer-sharp or if a referenced assembly results in true
if (asm_name.Name == "gstreamer-sharp")
if (asm.GetName().Name == "gstreamer-sharp")
result = true;
foreach (AssemblyName ref_name in asm.GetReferencedAssemblies ()) {
try {
result = result | CheckAssemblyReferences (Assembly.Load (ref_name));
result = result | PutAssemblyTypesInCache (Assembly.Load (ref_name));
} catch {
/* Failure to load a referenced assembly is not an error */
}
}
if (result)
AssemblyReferencesGstreamerSharp[asm_name.FullName] = true;
// Add types with GTypeNameAttribute in TypeCache
if (result) {
AssemblyTypesInCache[asm.GetHashCode ()] = true;
Type[] ts = asm.GetTypes ();
foreach (Type t in ts) {
if (t.IsDefined (typeof (GTypeNameAttribute), false)) {
GTypeNameAttribute gattr = (GTypeNameAttribute) Attribute.GetCustomAttribute (t, typeof (GTypeNameAttribute), false);
TypeCache[gattr.TypeName] = t;
}
}
}
return result;
}
private static System.Type GstResolveType (Gst.GLib.GType gtype, string gtype_name) {
// Make sure all loaded assemblies are in the TypeCache
Assembly[] assemblies = (Assembly[]) AppDomain.CurrentDomain.GetAssemblies ().Clone ();
// Make sure all loaded assemblies are in the Dictionary
foreach (Assembly asm in assemblies) {
CheckAssemblyReferences (asm);
PutAssemblyTypesInCache (asm);
}
foreach (string key in AssemblyReferencesGstreamerSharp.Keys) {
if (AssemblyReferencesGstreamerSharp[key]) {
try {
Assembly asm = Assembly.Load (key);
Type[] ts = asm.GetTypes ();
foreach (Type t in ts) {
if (t.IsDefined (typeof (Gst.GTypeNameAttribute), false)) {
GTypeNameAttribute gattr = (GTypeNameAttribute) Attribute.GetCustomAttribute (t, typeof (GTypeNameAttribute), false);
if (gtype_name.Equals (gattr.TypeName)) {
return t;
}
}
}
} catch (Exception) {
/* Failure to load a referenced assembly is not an error */
}
}
}
// Return the managed type
if (TypeCache.ContainsKey (gtype_name))
return TypeCache[gtype_name];
return null;
}