Create a new command handler using an APIMessage source.
Create a new command handler using an APIMessage source.
The settings this handler should use.
The source of APIMessages.
A request helper object which will be passed to handlers.
Create a new command handler using a cache.
Create a new command handler using a cache.
The settings this handler should use.
The cache to use for subscribing to created messages.
A request helper object which will be passed to handlers.