public virtual InternalEntityEntry StartTracking(
IEntityType entityType, EntityKey entityKey, object entity, ValueBuffer valueBuffer)
{
if (entityKey == EntityKey.InvalidEntityKey)
{
throw new InvalidOperationException(Strings.InvalidPrimaryKey(entityType.DisplayName()));
}
var existingEntry = TryGetEntry(entityKey);
if (existingEntry != null)
{
if (existingEntry.Entity != entity)
{
throw new InvalidOperationException(Strings.IdentityConflict(entityType.DisplayName()));
}
return existingEntry;
}
var newEntry = _subscriber.SnapshotAndSubscribe(_factory.Create(this, entityType, entity, valueBuffer));
_identityMap.Add(entityKey, newEntry);
_entityReferenceMap[entity] = newEntry;
newEntry.SetEntityState(EntityState.Unchanged);
return newEntry;
}
public virtual object GetEntity(
IEntityType entityType,
EntityKey entityKey,
EntityLoadInfo entityLoadInfo,
bool queryStateManager)
{
// hot path
Debug.Assert(entityType != null);
Debug.Assert(entityKey != null);
if (entityKey == EntityKey.InvalidEntityKey)
{
throw new InvalidOperationException(
Strings.InvalidEntityKeyOnQuery(entityType.DisplayName()));
}
if (queryStateManager)
{
var entry = _stateManager.TryGetEntry(entityKey);
if (entry != null)
{
return entry.Entity;
}
}
object entity;
WeakReference<object> weakReference;
if (!_identityMap.TryGetValue(entityKey, out weakReference)
|| !weakReference.TryGetTarget(out entity))
{
entity = entityLoadInfo.Materialize();
if (weakReference != null)
{
weakReference.SetTarget(entity);
}
else
{
GarbageCollectIdentityMap();
_identityMap.Add(entityKey, new WeakReference<object>(entity));
}
_valueBuffers.Add(entity, entityLoadInfo.ValueBuffer);
}
return entity;
}
public virtual object GetEntity(
IEntityType entityType,
EntityKey entityKey,
EntityLoadInfo entityLoadInfo,
bool queryStateManager)
{
// hot path
Debug.Assert(entityType != null);
Debug.Assert(entityKey != null);
if (entityKey == EntityKey.InvalidEntityKey)
{
return null;
}
if (queryStateManager)
{
var entry = _stateManager.TryGetEntry(entityKey);
if (entry != null)
{
return entry.Entity;
}
}
BufferedEntity bufferedEntity;
if (!_byEntityKey.TryGetValue(entityKey, out bufferedEntity))
{
bufferedEntity
= new BufferedEntity(entityType, entityLoadInfo.ValueReader)
{
// TODO: Optimize this by not materializing when not required for query execution. i.e.
// entity is only needed in final results
Instance = entityLoadInfo.Materialize()
};
_byEntityKey.Add(entityKey, bufferedEntity);
_byEntityInstance.Add(bufferedEntity.Instance, new List<BufferedEntity> { bufferedEntity });
}
return bufferedEntity.Instance;
}
public virtual void UpdateDependentMap(InternalEntityEntry entry, EntityKey oldKey, IForeignKey foreignKey)
{
if (entry.EntityState == EntityState.Detached)
{
return;
}
var newKey = entry.GetDependentKeyValue(foreignKey);
if (oldKey.Equals(newKey))
{
return;
}
Dictionary<EntityKey, HashSet<InternalEntityEntry>> fkMap;
if (_dependentsMap.TryGetValue(foreignKey, out fkMap))
{
HashSet<InternalEntityEntry> dependents;
if (oldKey != EntityKey.InvalidEntityKey
&& fkMap.TryGetValue(oldKey, out dependents))
{
dependents.Remove(entry);
if (dependents.Count == 0)
{
fkMap.Remove(oldKey);
}
}
if (newKey == EntityKey.InvalidEntityKey)
{
if (fkMap.Count == 0)
{
_dependentsMap.Remove(foreignKey);
}
}
else
{
if (!fkMap.TryGetValue(newKey, out dependents))
{
dependents = new HashSet<InternalEntityEntry>();
fkMap[newKey] = dependents;
}
dependents.Add(entry);
}
}
}
public virtual void UpdateIdentityMap(InternalEntityEntry entry, EntityKey oldKey, IKey principalKey)
{
if (entry.EntityState == EntityState.Detached)
{
return;
}
var newKey = GetKeyValueChecked(principalKey, entry);
if (oldKey.Equals(newKey))
{
return;
}
InternalEntityEntry existingEntry;
if (_identityMap.TryGetValue(newKey, out existingEntry)
&& existingEntry != entry)
{
throw new InvalidOperationException(CoreStrings.IdentityConflict(entry.EntityType.Name));
}
_identityMap.Remove(oldKey);
if (newKey != EntityKey.InvalidEntityKey)
{
_identityMap[newKey] = entry;
}
}
public virtual InternalEntityEntry TryGetEntry(EntityKey keyValue)
{
InternalEntityEntry entry;
_identityMap.TryGetValue(keyValue, out entry);
return entry;
}
private void AddToIdentityMap(IEntityType entityType, EntityKey entityKey, InternalEntityEntry newEntry)
{
_identityMap.Add(entityKey, newEntry);
foreach (var key in entityType.GetKeys().Where(k => k != entityKey.Key))
{
var principalKeyValue = newEntry.GetPrincipalKeyValue(key);
if (principalKeyValue != EntityKey.InvalidEntityKey)
{
_identityMap[principalKeyValue] = newEntry;
}
}
foreach (var foreignKey in entityType.GetForeignKeys())
{
var dependentKey = newEntry.GetDependentKeyValue(foreignKey);
if (dependentKey == EntityKey.InvalidEntityKey)
{
continue;
}
Dictionary<EntityKey, HashSet<InternalEntityEntry>> fkMap;
if (!_dependentsMap.TryGetValue(foreignKey, out fkMap))
{
fkMap = new Dictionary<EntityKey, HashSet<InternalEntityEntry>>();
_dependentsMap[foreignKey] = fkMap;
}
HashSet<InternalEntityEntry> dependents;
if (!fkMap.TryGetValue(dependentKey, out dependents))
{
dependents = new HashSet<InternalEntityEntry>();
fkMap[dependentKey] = dependents;
}
dependents.Add(newEntry);
}
}
private IEntityType IncludeCore(
object entity,
INavigation navigation,
out EntityKey primaryKey,
out Func<ValueBuffer, EntityKey> relatedKeyFactory)
{
var primaryKeyFactory
= _entityKeyFactorySource
.GetKeyFactory(navigation.ForeignKey.PrincipalKey.Properties);
var foreignKeyFactory
= _entityKeyFactorySource
.GetKeyFactory(navigation.ForeignKey.Properties);
var targetEntityType = navigation.GetTargetType();
object boxedValueBuffer;
if (!_valueBuffers.TryGetValue(entity, out boxedValueBuffer))
{
var entry = _stateManager.TryGetEntry(entity);
Debug.Assert(entry != null);
primaryKey
= navigation.PointsToPrincipal()
? entry.GetDependentKeySnapshot(navigation.ForeignKey)
: entry.GetPrimaryKeyValue();
}
else
{
primaryKey
= navigation.PointsToPrincipal()
? foreignKeyFactory
.Create(
targetEntityType.RootType(),
navigation.ForeignKey.Properties,
(ValueBuffer)boxedValueBuffer)
: primaryKeyFactory
.Create(
navigation.DeclaringEntityType.RootType(),
navigation.ForeignKey.PrincipalKey.Properties,
(ValueBuffer)boxedValueBuffer);
}
if (navigation.PointsToPrincipal())
{
relatedKeyFactory
= valueBuffer =>
primaryKeyFactory
.Create(
targetEntityType.RootType(),
navigation.ForeignKey.PrincipalKey.Properties,
valueBuffer);
}
else
{
relatedKeyFactory
= valueBuffer =>
foreignKeyFactory
.Create(
navigation.DeclaringEntityType.RootType(),
navigation.ForeignKey.Properties,
valueBuffer);
}
return targetEntityType;
}
private IEntityType IncludeCore(
object entity,
INavigation navigation,
out EntityKey primaryKey,
out List<BufferedEntity> bufferedEntities,
out Func<IValueReader, EntityKey> relatedKeyFactory)
{
var primaryKeyFactory
= _entityKeyFactorySource
.GetKeyFactory(navigation.ForeignKey.PrincipalKey.Properties);
var foreignKeyFactory
= _entityKeyFactorySource
.GetKeyFactory(navigation.ForeignKey.Properties);
var targetEntityType = navigation.GetTargetType();
if (!_byEntityInstance.TryGetValue(entity, out bufferedEntities))
{
_byEntityInstance.Add(entity, bufferedEntities = new List<BufferedEntity> { null });
var entry = _stateManager.TryGetEntry(entity);
Debug.Assert(entry != null);
primaryKey
= navigation.PointsToPrincipal
? entry.GetDependentKeySnapshot(navigation.ForeignKey)
: entry.GetPrimaryKeyValue();
}
else
{
// if entity is already in state manager it can't be added to the buffer. 'null' value was added to signify that
// this means relevant key should be acquired from state manager rather than buffered reader
if (bufferedEntities[0] == null)
{
var entry = _stateManager.TryGetEntry(entity);
Debug.Assert(entry != null);
primaryKey
= navigation.PointsToPrincipal
? entry.GetDependentKeySnapshot(navigation.ForeignKey)
: entry.GetPrimaryKeyValue();
}
else
{
primaryKey
= navigation.PointsToPrincipal
? foreignKeyFactory
.Create(
targetEntityType,
navigation.ForeignKey.Properties,
bufferedEntities[0].ValueReader)
: primaryKeyFactory
.Create(
navigation.EntityType,
navigation.ForeignKey.PrincipalKey.Properties,
bufferedEntities[0].ValueReader);
}
}
if (navigation.PointsToPrincipal)
{
relatedKeyFactory
= valueReader =>
primaryKeyFactory
.Create(
targetEntityType,
navigation.ForeignKey.PrincipalKey.Properties,
valueReader);
}
else
{
relatedKeyFactory
= valueReader =>
foreignKeyFactory
.Create(
navigation.EntityType,
navigation.ForeignKey.Properties,
valueReader);
}
return targetEntityType;
}