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import EventEmitter from 'events';
import AppDispatcher from 'dispatcher/app_dispatcher.jsx';
import Constants from 'utils/constants.jsx';
const ActionTypes = Constants.ActionTypes;
const CHANGE_EVENT = 'change';
const URL_DATA_CHANGE_EVENT = 'url_data_change';
class OpenGraphStoreClass extends EventEmitter {
constructor() {
super();
this.ogDataObject = {}; // Format: {<url>: <data-object>}
}
emitChange() {
this.emit(CHANGE_EVENT);
}
addChangeListener(callback) {
this.on(CHANGE_EVENT, callback);
}
removeChangeListener(callback) {
this.removeListener(CHANGE_EVENT, callback);
}
emitUrlDataChange(url) {
this.emit(URL_DATA_CHANGE_EVENT, url);
}
addUrlDataChangeListener(callback) {
this.on(URL_DATA_CHANGE_EVENT, callback);
}
removeUrlDataChangeListener(callback) {
this.removeListener(URL_DATA_CHANGE_EVENT, callback);
}
storeOgInfo(url, ogInfo) {
this.ogDataObject[url] = ogInfo;
}
getOgInfo(url) {
return this.ogDataObject[url];
}
}
var OpenGraphStore = new OpenGraphStoreClass();
// Not expecting more that `Constants.POST_CHUNK_SIZE` post previews rendered at a time
OpenGraphStore.setMaxListeners(Constants.POST_CHUNK_SIZE);
OpenGraphStore.dispatchToken = AppDispatcher.register((payload) => {
var action = payload.action;
switch (action.type) {
case ActionTypes.RECIVED_OPEN_GRAPH_METADATA:
OpenGraphStore.storeOgInfo(action.url, action.data);
OpenGraphStore.emitUrlDataChange(action.url);
OpenGraphStore.emitChange();
break;
default:
}
});
export default OpenGraphStore;
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