angular2/es6/prod/src/web_workers/shared/post_message_bus.js

Angular 2 - a web framework for modern web apps

var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") return Reflect.decorate(decorators, target, key, desc);
    switch (arguments.length) {
        case 2: return decorators.reduceRight(function(o, d) { return (d && d(o)) || o; }, target);
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        case 4: return decorators.reduceRight(function(o, d) { return (d && d(target, key, o)) || o; }, desc);
    }
};
var __metadata = (this && this.__metadata) || function (k, v) {
    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
import { BaseException } from 'angular2/src/facade/exceptions';
import { EventEmitter } from 'angular2/src/facade/async';
import { StringMapWrapper } from 'angular2/src/facade/collection';
import { Injectable } from "angular2/src/core/di";
/**
 * A TypeScript implementation of {@link MessageBus} for communicating via JavaScript's
 * postMessage API.
 */
export let PostMessageBus = class {
    constructor(sink, source) {
        this.sink = sink;
        this.source = source;
    }
    attachToZone(zone) {
        this.source.attachToZone(zone);
        this.sink.attachToZone(zone);
    }
    initChannel(channel, runInZone = true) {
        this.source.initChannel(channel, runInZone);
        this.sink.initChannel(channel, runInZone);
    }
    from(channel) { return this.source.from(channel); }
    to(channel) { return this.sink.to(channel); }
};
PostMessageBus = __decorate([
    Injectable(), 
    __metadata('design:paramtypes', [PostMessageBusSink, PostMessageBusSource])
], PostMessageBus);
export class PostMessageBusSink {
    constructor(_postMessageTarget) {
        this._postMessageTarget = _postMessageTarget;
        this._channels = StringMapWrapper.create();
        this._messageBuffer = [];
    }
    attachToZone(zone) {
        this._zone = zone;
        this._zone.overrideOnEventDone(() => this._handleOnEventDone(), false);
    }
    initChannel(channel, runInZone = true) {
        if (StringMapWrapper.contains(this._channels, channel)) {
            throw new BaseException(`${channel} has already been initialized`);
        }
        var emitter = new EventEmitter();
        var channelInfo = new _Channel(emitter, runInZone);
        this._channels[channel] = channelInfo;
        emitter.subscribe((data) => {
            var message = { channel: channel, message: data };
            if (runInZone) {
                this._messageBuffer.push(message);
            }
            else {
                this._sendMessages([message]);
            }
        });
    }
    to(channel) {
        if (StringMapWrapper.contains(this._channels, channel)) {
            return this._channels[channel].emitter;
        }
        else {
            throw new BaseException(`${channel} is not set up. Did you forget to call initChannel?`);
        }
    }
    _handleOnEventDone() {
        if (this._messageBuffer.length > 0) {
            this._sendMessages(this._messageBuffer);
            this._messageBuffer = [];
        }
    }
    _sendMessages(messages) { this._postMessageTarget.postMessage(messages); }
}
export class PostMessageBusSource {
    constructor(eventTarget) {
        this._channels = StringMapWrapper.create();
        if (eventTarget) {
            eventTarget.addEventListener("message", (ev) => this._handleMessages(ev));
        }
        else {
            // if no eventTarget is given we assume we're in a WebWorker and listen on the global scope
            addEventListener("message", (ev) => this._handleMessages(ev));
        }
    }
    attachToZone(zone) { this._zone = zone; }
    initChannel(channel, runInZone = true) {
        if (StringMapWrapper.contains(this._channels, channel)) {
            throw new BaseException(`${channel} has already been initialized`);
        }
        var emitter = new EventEmitter();
        var channelInfo = new _Channel(emitter, runInZone);
        this._channels[channel] = channelInfo;
    }
    from(channel) {
        if (StringMapWrapper.contains(this._channels, channel)) {
            return this._channels[channel].emitter;
        }
        else {
            throw new BaseException(`${channel} is not set up. Did you forget to call initChannel?`);
        }
    }
    _handleMessages(ev) {
        var messages = ev.data;
        for (var i = 0; i < messages.length; i++) {
            this._handleMessage(messages[i]);
        }
    }
    _handleMessage(data) {
        var channel = data.channel;
        if (StringMapWrapper.contains(this._channels, channel)) {
            var channelInfo = this._channels[channel];
            if (channelInfo.runInZone) {
                this._zone.run(() => { channelInfo.emitter.next(data.message); });
            }
            else {
                channelInfo.emitter.next(data.message);
            }
        }
    }
}
/**
 * Helper class that wraps a channel's {@link EventEmitter} and
 * keeps track of if it should run in the zone.
 */
class _Channel {
    constructor(emitter, runInZone) {
        this.emitter = emitter;
        this.runInZone = runInZone;
    }
}
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