aboutsummaryrefslogtreecommitdiffstats
path: root/catalog-ui/src/app/models/base-pubsub.ts
blob: 41e8039da5e8df0a0d4a7e0d018e94ef563f61e7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
declare const window: Window;

export class BasePubSub {

    subscribers: Map<string, ISubscriber>;
    eventsCallbacks: Array<Function>;
    clientId: string;
    eventsToWait: Map<string, Array<string>>;
    lastEventNotified: string;

    constructor(pluginId: string) {
        this.subscribers = new Map<string, ISubscriber>();
        this.eventsCallbacks = [];
        this.eventsToWait = new Map<string, Array<string>>();
        this.clientId = pluginId;
        this.lastEventNotified = "";
        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);
        });

        this.lastEventNotified = eventType;

        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;
}