48 lines
949 B
JavaScript
48 lines
949 B
JavaScript
// manage a set of unique ids
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export default class {
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constructor() {
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this.ids = new Set();
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}
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/**
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* Returns a unique identifier.
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*
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* @method fetch
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* @param {Object} data Records attributes hash
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* @return {String} Unique identifier
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* @public
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*/
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fetch() {
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let uuid = crypto.randomUUID();
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// odds are incredibly low that we'll run into a duplicate using crypto.randomUUID()
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// but just to be safe...
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while (this.ids.has(uuid)) {
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uuid = crypto.randomUUID();
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}
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this.ids.add(uuid);
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return uuid;
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}
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/**
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* Register an identifier.
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* Must throw if identifier is already used.
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*
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* @method set
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* @param {String|Number} id
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* @public
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*/
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set(id) {
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if (this.ids.has(id)) {
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throw new Error(`ID ${id} is in use.`);
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}
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this.ids.add(id);
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}
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/**
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* Reset identity manager.
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*
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* @method reset
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* @public
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*/
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reset() {
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this.ids.clear();
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}
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}
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