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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
cr.define('hotword', function() {
'use strict';
/**
* Base class for managing hotwording sessions.
* @param {!hotword.StateManager} stateManager Manager of global hotwording
* state.
* @param {!hotword.constants.SessionSource} sessionSource Source of the
* hotword session request.
* @constructor
*/
function BaseSessionManager(stateManager, sessionSource) {
/**
* Manager of global hotwording state.
* @protected {!hotword.StateManager}
*/
this.stateManager = stateManager;
/**
* Source of the hotword session request.
* @private {!hotword.constants.SessionSource}
*/
this.sessionSource_ = sessionSource;
/**
* Chrome event listeners. Saved so that they can be de-registered when
* hotwording is disabled.
* @private
*/
this.sessionRequestedListener_ = this.handleSessionRequested_.bind(this);
this.sessionStoppedListener_ = this.handleSessionStopped_.bind(this);
// Need to setup listeners on startup, otherwise events that caused the
// event page to start up, will be lost.
this.setupListeners_();
this.stateManager.onStatusChanged.addListener(function() {
hotword.debug('onStatusChanged');
this.updateListeners();
}.bind(this));
}
BaseSessionManager.prototype = {
/**
* Return whether or not this session type is enabled.
* @protected
* @return {boolean}
*/
enabled: assertNotReached,
/**
* Called when the hotwording session is stopped.
* @protected
*/
onSessionStop: function() {
},
/**
* Starts a launcher hotwording session.
* @param {hotword.constants.TrainingMode=} opt_mode The mode to start the
* recognizer in.
*/
startSession: function(opt_mode) {
this.stateManager.startSession(
this.sessionSource_,
function() {
chrome.hotwordPrivate.setHotwordSessionState(true, function() {});
},
this.handleHotwordTrigger.bind(this),
opt_mode);
},
/**
* Stops a launcher hotwording session.
* @private
*/
stopSession_: function() {
this.stateManager.stopSession(this.sessionSource_);
this.onSessionStop();
},
/**
* Handles a hotword triggered event.
* @param {?Object} log Audio log data, if audio logging is enabled.
* @protected
*/
handleHotwordTrigger: function(log) {
hotword.debug('Hotword triggered: ' + this.sessionSource_, log);
chrome.hotwordPrivate.notifyHotwordRecognition('search',
log,
function() {});
},
/**
* Handles a hotwordPrivate.onHotwordSessionRequested event.
* @private
*/
handleSessionRequested_: function() {
hotword.debug('handleSessionRequested_: ' + this.sessionSource_);
this.startSession();
},
/**
* Handles a hotwordPrivate.onHotwordSessionStopped event.
* @private
*/
handleSessionStopped_: function() {
hotword.debug('handleSessionStopped_: ' + this.sessionSource_);
this.stopSession_();
},
/**
* Set up event listeners.
* @private
*/
setupListeners_: function() {
if (chrome.hotwordPrivate.onHotwordSessionRequested.hasListener(
this.sessionRequestedListener_)) {
return;
}
chrome.hotwordPrivate.onHotwordSessionRequested.addListener(
this.sessionRequestedListener_);
chrome.hotwordPrivate.onHotwordSessionStopped.addListener(
this.sessionStoppedListener_);
},
/**
* Remove event listeners.
* @private
*/
removeListeners_: function() {
chrome.hotwordPrivate.onHotwordSessionRequested.removeListener(
this.sessionRequestedListener_);
chrome.hotwordPrivate.onHotwordSessionStopped.removeListener(
this.sessionStoppedListener_);
},
/**
* Update event listeners based on the current hotwording state.
* @protected
*/
updateListeners: function() {
if (this.enabled()) {
this.setupListeners_();
} else {
this.removeListeners_();
this.stopSession_();
}
}
};
return {
BaseSessionManager: BaseSessionManager
};
});
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