public IObjectReaderFactory Compile(SqlExpression expression, Type elementType)
{
object mapping = this.services.Context.Mapping.Identity;
DataLoadOptions options = this.services.Context.LoadOptions;
IObjectReaderFactory factory = null;
ObjectReaderFactoryCache cache = null;
bool canBeCompared = SqlProjectionComparer.CanBeCompared(expression);
if (canBeCompared)
{
cache = (ObjectReaderFactoryCache)Thread.GetData(cacheSlot);
if (cache == null)
{
cache = new ObjectReaderFactoryCache(maxReaderCacheSize);
Thread.SetData(cacheSlot, cache);
}
factory = cache.GetFactory(elementType, this.dataReaderType, mapping, options, expression);
}
if (factory == null)
{
DynamicTypeGenerator gen = new DynamicTypeGenerator(this, elementType);
#if DEBUG
if (ObjectReaderCompiler.CaptureModule != null)
{
this.CompileCapturedMethod(gen, expression, elementType);
}
#endif
DynamicMethod dm = this.CompileDynamicMethod(gen, expression, elementType);
Type fnMatType = typeof(Func <,>).MakeGenericType(typeof(ObjectMaterializer <>).MakeGenericType(this.dataReaderType), elementType);
var fnMaterialize = (Delegate)dm.CreateDelegate(fnMatType);
Type factoryType = typeof(ObjectReaderFactory <,>).MakeGenericType(this.dataReaderType, elementType);
factory = (IObjectReaderFactory)Activator.CreateInstance(
factoryType, BindingFlags.Instance | BindingFlags.NonPublic, null,
new object[] { fnMaterialize, gen.NamedColumns, gen.Globals, gen.Locals }, null
);
if (canBeCompared)
{
expression = new SourceExpressionRemover().VisitExpression(expression);
cache.AddFactory(elementType, this.dataReaderType, mapping, options, expression, factory);
}
}
return(factory);
}
internal IObjectReaderFactory GetFactory(Type elementType, Type dataReaderType, object mapping, DataLoadOptions options, SqlExpression projection)
{
for (LinkedListNode <CacheInfo> info = this.list.First; info != null; info = info.Next)
{
if (elementType == info.Value.elementType &&
dataReaderType == info.Value.dataReaderType &&
mapping == info.Value.mapping &&
DataLoadOptions.ShapesAreEquivalent(options, info.Value.options) &&
SqlProjectionComparer.AreSimilar(projection, info.Value.projection)
)
{
// move matching item to head of list to reset its lifetime
this.list.Remove(info);
this.list.AddFirst(info);
return(info.Value.factory);
}
}
return(null);
}