Split ImmediateSpeaker into separate class

This commit is contained in:
Talia 2021-11-25 10:37:16 +01:00
parent 738d6ca493
commit cabf557569
2 changed files with 41 additions and 31 deletions

View file

@ -1,43 +1,47 @@
class Speaker {
#callbacks = new Set()
#immediate
#scheduled = []
#retain
export class Speaker {
_callbacks = new Set()
_scheduled = []
_retain
constructor(immediate, ...initial) {
this.#immediate = immediate
this.#retain = initial
constructor(...initial) {
this._retain = initial
}
listen(callback) {
this.#callbacks.add(callback)
return this.#retain
this._callbacks.add(callback)
return this._retain
}
speak(...args) {
if (this.#immediate) {
for (let callback of this.#callbacks) {
callback(...args)
}
this.#retain = args
} else {
if (!this.#scheduled.length) {
queueMicrotask(() => {
for (let args of this.#scheduled) {
for (let callback of this.#callbacks) {
callback(...args)
}
this.#retain = args
if (!this._scheduled.length) {
queueMicrotask(() => {
for (let args of this._scheduled) {
for (let callback of this._callbacks) {
callback(...args)
}
this.#scheduled = []
})
}
this.#scheduled.push(args)
this._retain = args
}
this._scheduled = []
})
}
this._scheduled.push(args)
}
silence(callback) {
this.#callbacks.delete(callbacks)
forget(callback) {
this._callbacks.delete(callbacks)
}
silence() {
this._callbacks.clear()
}
}
export class ImmediateSpeaker extends Speaker {
speak(...args) {
for (let callback of this._callbacks) {
callback(...args)
}
this._retain = args
}
}

View file

@ -6,7 +6,7 @@ Callbacks are scheduled as microtasks by default.
## Interface:
```
Speaker(immediate=false, ...initial)
Speaker(...initial)
// Creates a new speaker.
Speaker.listen(callback)
// Registers a callback.
@ -24,7 +24,7 @@ first call to `speak`.
A simple example:
```js
const speaker = new Speaker(true /* run callbacks immediately */)
const speaker = new Speaker()
speaker.listen(value => console.log(value))
speaker.listen(value => console.warn(value))
@ -64,3 +64,9 @@ defer(() => {
defer(() => console.log("This message will appear last"))
})
```
## ImmediateSpeaker
This class may likely be renamed in the future.
Extends the speaker class, but doesn't defer its callbacks to a mycrotask.