public async Task <IShape> CreateAsync(string shapeType, Func <Task <IShape> > shapeFactory, Action <ShapeCreatingContext> creating, Action <ShapeCreatedContext> created)
{
ShapeDescriptor shapeDescriptor;
(await GetShapeTableAsync()).Descriptors.TryGetValue(shapeType, out shapeDescriptor);
var creatingContext = new ShapeCreatingContext
{
New = this,
ShapeFactory = this,
ShapeType = shapeType,
OnCreated = new List <Func <ShapeCreatedContext, Task> >(),
CreateAsync = shapeFactory
};
creating?.Invoke(creatingContext);
// "creating" events may add behaviors and alter base type
foreach (var ev in _events)
{
ev.Creating(creatingContext);
}
if (shapeDescriptor != null)
{
foreach (var ev in shapeDescriptor.CreatingAsync)
{
await ev(creatingContext);
}
}
// Create the new instance
var createdContext = new ShapeCreatedContext
{
New = creatingContext.New,
ShapeFactory = creatingContext.ShapeFactory,
ShapeType = creatingContext.ShapeType,
Shape = await creatingContext.CreateAsync()
};
var shape = createdContext.Shape as IShape;
if (shape == null)
{
throw new InvalidOperationException("Invalid base type for shape: " + createdContext.Shape.GetType().ToString());
}
if (shape.Metadata == null)
{
shape.Metadata = new ShapeMetadata();
}
ShapeMetadata shapeMetadata = shape.Metadata;
shape.Metadata.Type = shapeType;
// Merge wrappers if there are any
if (shapeDescriptor != null && shapeMetadata.Wrappers.Count + shapeDescriptor.Wrappers.Count > 0)
{
shapeMetadata.Wrappers.AddRange(shapeDescriptor.Wrappers);
}
// "created" events provides default values and new object initialization
foreach (var ev in _events)
{
ev.Created(createdContext);
}
if (shapeDescriptor != null)
{
foreach (var ev in shapeDescriptor.CreatedAsync)
{
await ev(createdContext);
}
}
if (creatingContext != null)
{
foreach (var ev in creatingContext.OnCreated)
{
await ev(createdContext);
}
}
created?.Invoke(createdContext);
return(createdContext.Shape);
}
public virtual void Creating(ShapeCreatingContext context)
{
}
