@ux-aspects/ux-aspects
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Open source user interface framework for building modern, responsive, mobile big data applications
87 lines • 14.6 kB
JavaScript
import { Subject } from 'rxjs';
import { distinctUntilChanged, filter, takeUntil } from 'rxjs/operators';
export class ConduitSubject {
constructor(conduit, _zone, zoneId) {
this.conduit = conduit;
this._zone = _zone;
this.zoneId = zoneId;
this._onDestroy = new Subject();
// store the target subject object
this._subject = conduit.subject;
// check if there are any conduits that have supplied an initial value
this.getInitialValue();
// subscribe to changes to the source subject
this._subject.pipe(distinctUntilChanged(conduit.changeDetection), takeUntil(this._onDestroy))
.subscribe(this.onOutput.bind(this));
// subscribe to the zone events and root zone events
_zone.getEvents().pipe(filter(event => event.conduit.id === conduit.id), takeUntil(this._onDestroy)).subscribe(this.onInput.bind(this));
}
/** Check all allow inputs to see if there is a value we should initially set the conduit to */
getInitialValue() {
// if we do not accept inputs then do nothing
if (this.conduit.acceptsInput === false) {
return;
}
// return all subjects that are 1) Not itself 2) In a zone that is listed in acceptsInput 3) Have a currentValue set
const subjects = this._zone.getSubjects().filter(subject => {
// If this is itself or if it has not value to give us then do nothing
// eslint-disable-next-line no-prototype-builtins
if (subject === this || subject.conduit.id !== this.conduit.id || !subject.conduit.hasOwnProperty('currentValue')) {
return false;
}
// if acceptsInput is true then we return every time
if (this.conduit.acceptsInput === true) {
return true;
}
if (Array.isArray(this.conduit.acceptsInput)) {
return this.conduit.acceptsInput.indexOf(subject.zoneId) !== -1;
}
});
// if there are no matches then do nothing
if (subjects.length === 0) {
return;
}
// otherwise sort by the last modified field
subjects.sort((subjectOne, subjectTwo) => subjectOne.conduit.lastModified.getTime() < subjectTwo.conduit.lastModified.getTime() ? 1 : -1);
// get the most recent value
this._subject.next(subjects[0].conduit.currentValue);
}
/** This will be triggered when a conduits value has changed */
onInput(event) {
// if we dont accept input or we emitted this value then do nothing
if (this.conduit.acceptsInput === false || event.conduit === this.conduit) {
return;
}
// check if the conduit produces output - if not we only do something if we are in the same zone
if (event.conduit.producesOutput === false && event.zoneId !== this.zoneId) {
return;
}
// check if we only accept inputs from specific zones
if (Array.isArray(this.conduit.acceptsInput)) {
// check if the event came from an acceptable zone
if (!this.conduit.acceptsInput.find(zone => zone === event.zoneId)) {
return;
}
}
// if required transform the value
const outputValue = this.conduit.map ? this.conduit.map(event.value) : event.value;
// update the subject
this._subject.next(outputValue);
}
/** This will be fired when this conduit emits a new value */
onOutput(value) {
// store the most recent value and when it was modified - can be used for any new conduits to lookup a value
this.conduit.currentValue = value;
this.conduit.lastModified = new Date();
// check if this should produce output
if (this.conduit.producesOutput) {
this._zone.emit({ conduit: this.conduit, zoneId: this.zoneId, value });
}
}
/** Unsubscribe once this subject is destroyed */
destroy() {
this._onDestroy.next();
this._onDestroy.complete();
}
}
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{ Subject } from 'rxjs';\nimport { distinctUntilChanged, filter, takeUntil } from 'rxjs/operators';\nimport { ConduitZone } from './conduit-zone.service';\nimport { ConduitEvent } from './interfaces/conduit-event';\nimport { ConduitMetadata } from './interfaces/conduit-metadata';\n\nexport class ConduitSubject {\n\n     \n    private readonly _subject: Subject<any>;\n    private readonly _onDestroy = new Subject<void>();\n\n    constructor(public conduit: ConduitMetadata, private readonly _zone: ConduitZone, public zoneId: string) {\n\n        // store the target subject object\n        this._subject = conduit.subject;\n\n        // check if there are any conduits that have supplied an initial value\n        this.getInitialValue();\n\n        // subscribe to changes to the source subject\n        this._subject.pipe(distinctUntilChanged(conduit.changeDetection), takeUntil(this._onDestroy))\n            .subscribe(this.onOutput.bind(this));\n\n        // subscribe to the zone events and root zone events\n        _zone.getEvents().pipe(filter(event => event.conduit.id === conduit.id), takeUntil(this._onDestroy)).subscribe(this.onInput.bind(this));\n    }\n\n    /** Check all allow inputs to see if there is a value we should initially set the conduit to */\n    getInitialValue(): void {\n\n        // if we do not accept inputs then do nothing\n        if (this.conduit.acceptsInput === false) {\n            return;\n        }\n\n        // return all subjects that are 1) Not itself 2) In a zone that is listed in acceptsInput 3) Have a currentValue set\n        const subjects = this._zone.getSubjects().filter(subject => {\n\n            // If this is itself or if it has not value to give us then do nothing\n            // eslint-disable-next-line no-prototype-builtins\n            if (subject === this || subject.conduit.id !== this.conduit.id || !subject.conduit.hasOwnProperty('currentValue')) {\n                return false;\n            }\n\n            // if acceptsInput is true then we return every time\n            if (this.conduit.acceptsInput === true) {\n                return true;\n            }\n\n            if (Array.isArray(this.conduit.acceptsInput)) {\n                return this.conduit.acceptsInput.indexOf(subject.zoneId) !== -1;\n            }\n        });\n\n        // if there are no matches then do nothing\n        if (subjects.length === 0) {\n            return;\n        }\n\n        // otherwise sort by the last modified field\n        subjects.sort((subjectOne, subjectTwo) => subjectOne.conduit.lastModified.getTime() < subjectTwo.conduit.lastModified.getTime() ? 1 : -1);\n\n        // get the most recent value\n        this._subject.next(subjects[0].conduit.currentValue);\n    }\n\n    /** This will be triggered when a conduits value has changed */\n    onInput(event: ConduitEvent): void {\n        // if we dont accept input or we emitted this value then do nothing\n        if (this.conduit.acceptsInput === false || event.conduit === this.conduit) {\n            return;\n        }\n\n        // check if the conduit produces output - if not we only do something if we are in the same zone\n        if (event.conduit.producesOutput === false && event.zoneId !== this.zoneId) {\n            return;\n        }\n\n        // check if we only accept inputs from specific zones\n        if (Array.isArray(this.conduit.acceptsInput)) {\n            // check if the event came from an acceptable zone\n            if (!this.conduit.acceptsInput.find(zone => zone === event.zoneId)) {\n                return;\n            }\n        }\n\n        // if required transform the value\n        const outputValue = this.conduit.map ? this.conduit.map(event.value) : event.value;\n\n        // update the subject\n        this._subject.next(outputValue);\n    }\n\n    /** This will be fired when this conduit emits a new value */\n     \n    onOutput(value: any): void {\n\n        // store the most recent value and when it was modified - can be used for any new conduits to lookup a value\n        this.conduit.currentValue = value;\n        this.conduit.lastModified = new Date();\n\n        // check if this should produce output\n        if (this.conduit.producesOutput) {\n            this._zone.emit({ conduit: this.conduit, zoneId: this.zoneId, value });\n        }\n    }\n\n    /** Unsubscribe once this subject is destroyed */\n    destroy(): void {\n        this._onDestroy.next();\n        this._onDestroy.complete();\n    }\n}\n"]}