80 lines
2.3 KiB
JavaScript
80 lines
2.3 KiB
JavaScript
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import { Action } from './Action';
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export class AsyncAction extends Action {
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constructor(scheduler, work) {
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super(scheduler, work);
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this.scheduler = scheduler;
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this.work = work;
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this.pending = false;
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}
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schedule(state, delay = 0) {
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if (this.closed) {
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return this;
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}
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this.state = state;
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const id = this.id;
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const scheduler = this.scheduler;
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if (id != null) {
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this.id = this.recycleAsyncId(scheduler, id, delay);
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}
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this.pending = true;
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this.delay = delay;
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this.id = this.id || this.requestAsyncId(scheduler, this.id, delay);
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return this;
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}
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requestAsyncId(scheduler, id, delay = 0) {
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return setInterval(scheduler.flush.bind(scheduler, this), delay);
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}
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recycleAsyncId(scheduler, id, delay = 0) {
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if (delay !== null && this.delay === delay && this.pending === false) {
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return id;
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}
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clearInterval(id);
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return undefined;
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}
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execute(state, delay) {
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if (this.closed) {
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return new Error('executing a cancelled action');
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}
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this.pending = false;
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const error = this._execute(state, delay);
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if (error) {
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return error;
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}
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else if (this.pending === false && this.id != null) {
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this.id = this.recycleAsyncId(this.scheduler, this.id, null);
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}
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}
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_execute(state, delay) {
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let errored = false;
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let errorValue = undefined;
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try {
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this.work(state);
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}
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catch (e) {
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errored = true;
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errorValue = !!e && e || new Error(e);
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}
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if (errored) {
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this.unsubscribe();
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return errorValue;
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}
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}
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_unsubscribe() {
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const id = this.id;
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const scheduler = this.scheduler;
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const actions = scheduler.actions;
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const index = actions.indexOf(this);
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this.work = null;
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this.state = null;
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this.pending = false;
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this.scheduler = null;
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if (index !== -1) {
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actions.splice(index, 1);
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}
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if (id != null) {
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this.id = this.recycleAsyncId(scheduler, id, null);
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}
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this.delay = null;
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}
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}
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//# sourceMappingURL=AsyncAction.js.map
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