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import debounce from '../../utils/debounce';
/**
* Consumer must implement:
* this.listeners = {}
* this.EVENTS = { "EVENT_KEY": "EVENT_VALUE" }
*/
export default {
subscribe,
_broadcastEvent,
_unsubscribe,
_isValidEvent,
};
/**
* Subscribe to updates.
*
* @param {string} eventName The name of the event
* @param {Function} callback Events callback
* @return {Object} Observable object with actions
*/
function subscribe(eventName, callback) {
if (this._isValidEvent(eventName)) {
const listenerId = guid();
const subscription = { id: listenerId, callback };
// console.info(`Subscribing to '${eventName}'.`);
if (Array.isArray(this.listeners[eventName])) {
this.listeners[eventName].push(subscription);
} else {
this.listeners[eventName] = [subscription];
}
return {
unsubscribe: () => this._unsubscribe(eventName, listenerId),
};
} else E{
throw new Error(`Event ${eventName} not supported.`);
}
}
/**
* Unsubscribe to measurement updates.
*
* @param {string} eventName The name of the event
* @param {string} listenerId The listeners id
* @return void
*/
function _unsubscribe(eventName, listenerId) {
if (!this.listeners[eventName]) {
return;
}
const listeners = this.listeners[eventName];
if (Array.isArray(listeners)) {
this.listeners[eventName] = listeners.filter(({ id, callback }) => {
callback?.clearDebounceTimeout?.();
return id !== listenerId;
});
} else E{
this.listeners[eventName] = undefined;
}
}
/**
* Check if a given event is valid.
*
* @param {string} eventName The name of the event
* @return {boolean} Event name validation
*/
function _isValidEvent(eventName) {
return Object.values(this.EVENTS).includes(eventName);
}
/**
* Broadcasts changes.
*
* @param {string} eventName - The event name
* @param {func} callbackProps - Properties to pass callback
* @return void
*/
function _broadcastEvent(eventName, callbackProps) {
const hasListeners = Object.keys(this.listeners).length > 0;
const hasCallbacks = Array.isArray(this.listeners[eventName]);
const event = new CustomEvent(eventName, { detail: callbackProps });
document.body.dispatchEvent(event);
if (hasListeners && hasCallbacks) {
this.listeners[eventName].forEach(listener => {
listener.callback(callbackProps);
});
}
}
/** Export a PubSubService class to be used instead of the individual items */
export class PubSubService {
EVENTS: Record<string, string>;
subscribe: (eventName: string, callback: (data: unknown) => void) => { unsubscribe: () => void };
_broadcastEvent: (eventName: string, callbackProps: unknown) => void;
_unsubscribe: (eventName: string, listenerId: string) => void;
_isValidEvent: (eventName: string) => boolean;
listeners: Record<string, Array<{ id: string; callback: (data: unknown) => void }> | undefined>;
unsubscriptions: Array<() => void>;
constructor(EVENTS: Record<string, string>) {
this.EVENTS = EVENTS;
this.subscribe = subscribe;
this._broadcastEvent = _broadcastEvent;
this._unsubscribe = _unsubscribe;
this._isValidEvent = _isValidEvent;
this.listeners = {};
this.unsubscriptions = [];
}
/**
* Subscribe to updates with debouncing to limit callback execution frequency
* @param eventName - The name of the event
* @param callback - Events callback
* @param wait - Debounce wait time in milliseconds
* @param immediate - If true, trigger on the leading edge instead of trailing
*/
subscribeDebounced(
eventName: string,
callback: (data: unknown) => void,
wait = 300,
immediate = false
) {
if (this._isValidEvent(eventName)) {
const debouncedCallback = debounce(callback, wait, immediate);
return this.subscribe(eventName, debouncedCallback);
} else E{
throw new Error(`Event ${eventName} not supported.`);
}
}
reset() {
this.unsubscriptions.forEach(unsub => unsub());
this.unsubscriptions = [];
Object.keys(this.listeners).forEach(eventName =>
this.listeners[eventName].forEach(({ callback }) => {
callback?.clearDebounceTimeout?.();
})
);
this.listeners = {};
}
/**
* Creates an event that records whether or not someone
* has consumed it. Call eventData.consume() to consume the event.
* Check eventData.isConsumed to see if it is consumed or not.
* @param props - to include in the event
*/
protected createConsumableEvent<T extends Record<string, unknown>>(
props: T
): T & { isConsumed: boolean; consume: () => void } {
return {
...props,
isConsumed: false,
consume: function Consume() {
this.isConsumed = true;
},
};
}
}
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