Function subscribe

pub fn subscribe(
    pattern: MStr<Pattern>,
    handler: ShareableMessageHandler,
    priority: Option<u8>,
)

Subscribes the handler to the pattern with an optional priority.

Warnings

Assigning priority handling is an advanced feature which shouldn’t normally be needed by most users. Only assign a higher priority to the subscription if you are certain of what you’re doing. If an inappropriate priority is assigned then the handler may receive messages before core system components have been able to process necessary calculations and produce potential side effects for logically sound behavior.