28 lines
646 B
JavaScript
28 lines
646 B
JavaScript
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/**
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* Implementation of a simple Oberver Pattern for custom event handling
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*/
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function Observer() {
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this.handlers = new Set();
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}
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Observer.prototype = {
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// Adds handler for this message
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on(callback) {
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this.handlers.add(callback);
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return callback;
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},
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clear(callback) {
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return this.handlers.delete(callback);
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},
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emit(msg) {
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this.handlers.forEach(async (handler) => {
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try {
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await handler(msg);
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} catch (e) {
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console.warn('Observer failed to run handler');
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console.warn(handler);
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}
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});
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},
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};
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