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A simple implementation of an event bus in Javascript
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| function EventBus() { | |
| const eventCallbacksPairs = []; | |
| this.subscribe = function( eventType, callback ) { | |
| const eventCallbacksPair = findEventCallbacksPair(eventType); | |
| if(eventCallbacksPair) | |
| eventCallbacksPair.callbacks.push(callback); | |
| else | |
| eventCallbacksPairs.push( new EventCallbacksPair(eventType, callback) ); | |
| } | |
| this.post = function( eventType, args ) { | |
| const eventCallbacksPair = findEventCallbacksPair(eventType); | |
| if(!eventCallbacksPair) { | |
| console.error("no subscribers for event " +eventType); | |
| return; | |
| } | |
| eventCallbacksPair.callbacks.forEach( callback => callback(args) ); | |
| } | |
| function findEventCallbacksPair(eventType) { | |
| return eventCallbacksPairs.find( eventObject => eventObject.eventType === eventType ); | |
| } | |
| function EventCallbacksPair( eventType, callback ) { | |
| this.eventType = eventType; | |
| this.callbacks = [callback]; | |
| } | |
| } |
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