An event source whose firing can be temporarily disabled

Calls to disable() and enable() may be nested, so the number of enable() calls must match the number of disable() calls in order for the event source to resume firing.

Events occuring while the source is disabled may be buffered. Readable sources will normally buffer only their last value, and therefore send at most one event when re-enabled. Non-readable sources such as Broadcast and Distributor typically will buffer as many events as there are currently registered callbacks for, and raise an error if more events occur, in order to avoid growing the buffer indefinitely.

disable ()

enable ()