Rebouncer is a package that takes a noisy source of events and produces a cleaner, fitter, happier (not drinking too much) source. It is useful in scenarios where you want debounce-like functionality, and full control over how events are consumed, filtered, queued and flushed to the consuming process.
NiceEvent is simply the type of event you pass in to Rebouncer. It exists only as a concept so we can have something to refer to:
type Rebouncer[NICE any] interface {
Subscribe() <-chan NICE // the channel a consumer can subsribe to
emit() // flushes the Queue
readQueue() []NICE // gets the Queue, with safety and locking
writeQueue([]NICE) // sets the Queue, handling safety and locking
ingest(Ingester[NICE])
quantize(Quantizer[NICE]) // decides whether the flush the Queue
reduce(Reducer[NICE], NICE) // removes unwanted NiceEvents from the Queue
Interrupt() // call this to initiate the "Draining" state
}
type myType struct {
...
}
bufferSize = 1024 // how much buffer space do we want for incoming events?
// myRebouncer is a Rebouncer of type myType
myRebouncer := rebouncer.NewRebouncer[myType](ingest, reduce, quantize, bufferSize)Rebouncer has two run-loops:
The Ingestor runs in it's own loop, pushing events to a channel in Rebouncer. Every time an event is pushed, Reducer runs. Reducer operates on the entire queue of events, filtering out unwanted events or modifying to taste. Here are the definitions of these functions. NICE is a type parameter. Internally, your custom event type is known as a "Nice Event".
type Ingester[NICE any] func(chan<- NICE)
type Reducer[NICE any] func([]NICE) []NICEQuantizer returns true or false. True when we want to flush the queue to the consumer, and False when we don't. As soon as Quantizer is returned, it's run again. So to throttle it, do time.Sleep().
When the program enters the Draining state, it shuts down after the last Emit(). Otherwise it keeps looping.
type Quantizer[NICE any] func([]NICE) boolEnsure that your Ingestor, Reducer, and Quantizer all operate on the same type:
// Example
type myEvent struct {
id int
name string
timestamp time.Time
}
// ingest events
ingest := func(incoming<- myEvent) {
for ev := range mySourceOfEvents() {
incoming<-ev
}
}
// we're not interested in any event involving .DS_Store
reduce := func(inEvents []myEvent) []myEvent {
outEvents := []myEvent{}
for ev := range inEvents {
if ev.name != ".DS_Store" {
outEvents = append(outEvents, ev)
}
}
return outEvents
}
// flush the queue every second
quantize := func(queue []myEvent) bool {
time.Sleep(time.Second)
if len(queue) > 0 {
return true
} else {
return false
}
}
re := rebouncer.NewRebouncer[myEvent](ingest, reduce, quantize, 1024)
for ev := range re.Subscribe() {
fmt.Println(ev)
}
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