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declare const window: Window;
export class BasePubSub {
subscribers: Map<string, ISubscriber>;
eventsCallbacks: Array<Function>;
clientId: string;
eventsToWait: Map<string, Array<string>>;
constructor(pluginId: string) {
this.subscribers = new Map<string, ISubscriber>();
this.eventsCallbacks = [];
this.eventsToWait = new Map<string, Array<string>>();
this.clientId = pluginId;
this.onMessage = this.onMessage.bind(this);
window.addEventListener("message", this.onMessage);
}
public register(subscriberId: string, subscriberWindow: Window, subscriberUrl: string) {
const subscriber = {
window: subscriberWindow,
locationUrl: subscriberUrl || subscriberWindow.location.href
} as ISubscriber;
this.subscribers.set(subscriberId, subscriber);
}
public unregister(subscriberId: string) {
this.subscribers.delete(subscriberId);
}
public on(callback: Function) {
let functionExists = this.eventsCallbacks.find((func: Function) => {
return callback.toString() == func.toString()
});
if (!functionExists) {
this.eventsCallbacks.push(callback);
}
}
public off(callback: Function) {
let index = this.eventsCallbacks.indexOf(callback);
this.eventsCallbacks.splice(index, 1)
}
public notify(eventType:string, eventData?:any) {
let eventObj = {
type: eventType,
data: eventData,
originId: this.clientId
} as IPubSubEvent;
this.subscribers.forEach( (subscriber: ISubscriber, subscriberId: string) => {
subscriber.window.postMessage(eventObj, subscriber.locationUrl);
});
return {
subscribe: function(callbackFn) {
if(this.subscribers.size !== 0) {
let subscribersToNotify = Array.from(this.subscribers.keys());
const checkNotifyComplete = (subscriberId: string) => {
let index = subscribersToNotify.indexOf(subscriberId);
subscribersToNotify.splice(index, 1);
if (subscribersToNotify.length === 0) {
callbackFn();
}
};
this.subscribers.forEach((subscriber: ISubscriber, subscriberId: string) => {
if (this.eventsToWait.has(subscriberId) && this.eventsToWait.get(subscriberId).indexOf(eventType) !== -1) {
const actionCompletedFunction = (eventData, subId = subscriberId) => {
if (eventData.type == "ACTION_COMPLETED") {
checkNotifyComplete(subId);
}
this.off(actionCompletedFunction);
};
this.on(actionCompletedFunction);
}
else {
checkNotifyComplete(subscriberId);
}
});
}
else {
callbackFn();
}
}.bind(this)
}
}
public isWaitingForEvent(eventName: string) : boolean {
return Array.from(this.eventsToWait.values()).some((eventsList: Array<string>) =>
eventsList.indexOf(eventName) !== -1
);
}
protected onMessage(event: any) {
if (this.subscribers.has(event.data.originId)) {
this.eventsCallbacks.forEach((callback: Function) => {
callback(event.data, event);
})
}
}
}
export interface IPubSubEvent {
type: string;
originId: string;
data: any;
}
export interface ISubscriber {
window: Window;
locationUrl: string;
}
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