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import { DEFAULT_ADAPTER } from './constants'; | |
/* | |
Creates the subscription object | |
@param component function the React component | |
@param autoUnmount boolean defaults to true, if it has to remove all subscriptions on cwunmount | |
@param adapter object the pubsub adapter | |
@return the subscription object | |
*/ | |
const createSubscription = function(component, autoUnmount = true, adapter) { | |
let sub = { | |
componentWillUnmount: component.componentWillUnmount, | |
subscriptions: [], | |
add(action, cb) { | |
const token = adapter.subscribe(action, cb); | |
sub.subscriptions.push(token); | |
return () => { | |
sub.subscriptions.splice(sub.subscriptions.indexOf(token), 1); | |
adapter.unsubscribe(token); | |
} | |
}, | |
removeAll() { | |
sub.subscriptions.forEach( token => adapter.unsubscribe(token) ); | |
sub.subscriptions = []; | |
}, | |
publish(action, params) { | |
adapter.publish(action, params); | |
} | |
}; | |
if (autoUnmount) { | |
component.componentWillUnmount = () => { | |
const { componentWillUnmount, removeAll } = sub; | |
componentWillUnmount && componentWillUnmount.apply(component, arguments); | |
removeAll(); | |
sub = void 0; | |
}; | |
} | |
return sub; | |
}; | |
/* | |
PubSubAdapter function | |
@param Object adapter being used | |
@returns an object wrapping publish/subscribe/unsubscribe from given adapter | |
*/ | |
const PubSubAdapter = (adapter) => { | |
const { publish, subscribe, unsubscribe } = adapter; | |
return { | |
publish, | |
subsribe, | |
unsubscribe | |
} | |
}; | |
/* | |
createPubSub function | |
@param subscribersMap Object, default to empty object, subscribers that will be populated | |
like so: | |
subscribersMap[MyReactComponent] = {...} | |
@param adapter Object, default to default adapter specified | |
@returns an object wrapping register/unregister for a particular component | |
*/ | |
const createPubSub = (subscribersMap = {}, adapter = DEFAULT_ADAPTER) => { | |
return { | |
register(component, autoUnmount = true) { | |
let registeredComponent = subscribersMap[component]; | |
registeredComponent = registeredComponent || createSubscription(component, autoUnmount, PubSubAdapter(adapter)); | |
return registeredComponent; | |
}, | |
unregister(component) { | |
if (subscribersMap[component]) { | |
subscribersMap[component].removeAll() && delete subscribersMap[component]; | |
} else { | |
console.log(`${component.displayName} is NOT registerd to PubSub`); | |
} | |
}, | |
}; | |
}; | |
export default createPubSub; |
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