OpenServer/Utils
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Adding support for reading the last value.

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This commit is contained in:
Fabian Stamm 2019-08-22 13:54:56 +02:00
parent edd37246fb
commit 564166a781
3 changed files with 28 additions and 7 deletions
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8
package-lock.json generated
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@ -1,13 +1,13 @@
{ {
"name": "@hibas123/utils", "name": "@hibas123/utils",
"version": "2.1.0", "version": "2.1.1",
"lockfileVersion": 1, "lockfileVersion": 1,
"requires": true, "requires": true,
"dependencies": { "dependencies": {
"typescript": { "typescript": {
"version": "3.4.5", "version": "3.5.3",
"resolved": "https://registry.npmjs.org/typescript/-/typescript-3.4.5.tgz", "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.5.3.tgz",
"integrity": "sha512-YycBxUb49UUhdNMU5aJ7z5Ej2XGmaIBL0x34vZ82fn3hGvD+bgrMrVDpatgz2f7YxUMJxMkbWxJZeAvDxVe7Vw==", "integrity": "sha512-ACzBtm/PhXBDId6a6sDJfroT2pOWt/oOnk4/dElG5G33ZL776N3Y6/6bKZJBFpd+b05F3Ct9qDjMeJmRWtE2/g==",
"dev": true "dev": true
} }
} }

2
package.json
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@ -16,7 +16,7 @@
"type": "git" "type": "git"
}, },
"devDependencies": { "devDependencies": {
"typescript": "^3.4.5" "typescript": "^3.5.3"
}, },
"files": [ "files": [
"src/", "src/",

23
src/observable.ts
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@ -20,6 +20,7 @@ export type ObservableInterface<T> = {
}; };
const ClosedSymbol = Symbol("Observable Closed"); const ClosedSymbol = Symbol("Observable Closed");
const LastValueSymbol = Symbol("Observable LastValue");
export default class Observable<T = any> { export default class Observable<T = any> {
private subscriber: ObserverCallback<T>[] = []; private subscriber: ObserverCallback<T>[] = [];
@ -30,12 +31,22 @@ export default class Observable<T = any> {
// Use symbol to make sure this property cannot be changed from the outside // Use symbol to make sure this property cannot be changed from the outside
private [ClosedSymbol] = false; private [ClosedSymbol] = false;
private [LastValueSymbol]: T | undefined = undefined;
get lastValue() {
return this[LastValueSymbol];
}
get closed() { get closed() {
return this[ClosedSymbol]; return this[ClosedSymbol];
} }
constructor(private collect_intervall: number = 100) { } constructor(private collect_intervall: number = 100) { }
/**
* Subscribe to changes
* @param callback Callback called once a value is available
*/
subscribe(callback: ObserverCallback<T>) { subscribe(callback: ObserverCallback<T>) {
if (this[ClosedSymbol]) if (this[ClosedSymbol])
throw new Error("Observable is closed!"); throw new Error("Observable is closed!");
@ -45,6 +56,10 @@ export default class Observable<T = any> {
this.subscriber.push(callback) this.subscriber.push(callback)
} }
/**
* Unsubscribe specified callback. After that, it will be discarded.
* @param callback The callback originally subscribed
*/
unsubscribe(callback: ObserverCallback<T> | ObserverCallbackCollect<T>) { unsubscribe(callback: ObserverCallback<T> | ObserverCallbackCollect<T>) {
if (this[ClosedSymbol]) if (this[ClosedSymbol])
return; return;
@ -59,6 +74,10 @@ export default class Observable<T = any> {
} }
} }
/**
* Subscribe for a collection of changes
* @param callback Callback called once a or some values are available.
*/
subscribeCollect(callback: ObserverCallbackCollect<T>) { subscribeCollect(callback: ObserverCallbackCollect<T>) {
if (this[ClosedSymbol]) if (this[ClosedSymbol])
throw new Error("Observable is closed!"); throw new Error("Observable is closed!");
@ -89,7 +108,9 @@ export default class Observable<T = any> {
*/ */
send(data: T) { send(data: T) {
if (this[ClosedSymbol]) if (this[ClosedSymbol])
throw new Error("Observable is closed!") throw new Error("Observable is closed!");
this[LastValueSymbol] = data;
this.subscriber.forEach(e => e(data)); this.subscriber.forEach(e => e(data));
this.events.push(data); this.events.push(data);
if (!this.timeout) { if (!this.timeout) {