internal TMetadata GetMetadataFromCache <TMetadata>(string name)
where TMetadata : IMetadata
{
MetadataKey key = new MetadataKey(typeof(TMetadata), name, this.Notation.Comparer);
if (this.entries.TryGetValue(key, out object value))
{
return((TMetadata)value);
}
return(default);
public void AddMetadata <TMetadata>(TMetadata metadata)
where TMetadata : IMetadata
{
if (metadata == null)
{
throw new ArgumentNullException(nameof(metadata));
}
if (metadata.Relation == null)
{
throw new ArgumentNullException(nameof(metadata.Relation));
}
MetadataKey key = MetadataKey.FromIdentity <TMetadata>(metadata.Relation.Identity);
if (!this.entries.TryAdd(key, metadata))
{
throw new InvalidOperationException("Metadata already added.");
}
}
public TMetadata Lookup <TMetadata>(string name)
where TMetadata : IMetadata
{
MetadataKey key = this.CreateKey <TMetadata>(name);
ReaderWriterLockSlim slim = this.GetLock <TMetadata>();
try
{
slim.EnterReadLock();
if (this.entries.TryGetValue(key, out object value))
{
return((TMetadata)value);
}
}
catch (LockRecursionException ex)
{
throw MetadataBuilderException.NoRecursion <TMetadata>(name, ex);
}
finally
{
if (slim.IsReadLockHeld)
{
slim.ExitReadLock();
}
}
slim.EnterWriteLock();
try
{
MetadataIdentity identity = new MetadataIdentity(this, name);
IRelationMetadata relation = this.GetCachedMetadata <IRelationMetadata>(name) ?? this.Store.RelationBuilder.GetMetadata(this, identity);
if (relation == null)
{
return(default);