b38dea0597
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113 lines
2.7 KiB
JavaScript
Executable file
113 lines
2.7 KiB
JavaScript
Executable file
'use strict';
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/**
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* CloseLockManager manages requests from multiple modules on whether we
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* should close ourselves *now* or wait for the "stayAwake" lock to unlock.
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* The "requestClose" request is a lock too because one might ask to close
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* the app but decide not to do that later.
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*
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* Examples:
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*
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* 1. If there is no stayAwake lock exist and one ask for a requestClose lock,
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* the app will be closed immediately.
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* 2. If there is a stayAwake lock exist, app will close only until the existing
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* stayAwake lock unlocks.
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* 2.1. Or, you could cancel the request by unlock your requestClose lock.
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*
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*/
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(function(exports) {
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var CloseLock = function(manager, topic) {
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this._manager = manager;
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this._topic = topic;
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};
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CloseLock.prototype.unlock = function() {
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this._manager.releaseLock(this, this._topic);
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};
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var CloseLockManager = function CloseLockManager() {
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this._closeLocks = null;
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this._awakeLocks = null;
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this.waitForUnlock = false;
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};
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CloseLockManager.prototype.onclose = null;
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CloseLockManager.prototype.start = function() {
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this._closeLocks = new Set();
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this._awakeLocks = new Set();
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this.waitForUnlock = false;
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};
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CloseLockManager.prototype.stop = function() {
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this._closeLocks = null;
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this._awakeLocks = null;
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this.waitForUnlock = false;
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};
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CloseLockManager.prototype.requestLock = function(topic) {
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var lock = new CloseLock(this, topic);
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switch (topic) {
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case 'requestClose':
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this._closeLocks.add(lock);
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break;
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case 'stayAwake':
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this._awakeLocks.add(lock);
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break;
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default:
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throw 'CloseLockManager: Undefined topic ' + topic;
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}
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this._maybeCloseNow();
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return lock;
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};
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CloseLockManager.prototype.releaseLock = function(lock, topic) {
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if (!(lock instanceof CloseLock)) {
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throw 'CloseLockManager: releaseLock need a lock.';
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}
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var set;
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switch (topic) {
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case 'requestClose':
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set = this._closeLocks;
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break;
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case 'stayAwake':
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set = this._awakeLocks;
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break;
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default:
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throw 'CloseLockManager: Undefined topic ' + topic;
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}
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if (!set.has(lock)) {
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// Already released
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return;
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}
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set.delete(lock);
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this._maybeCloseNow();
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};
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CloseLockManager.prototype._maybeCloseNow = function() {
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// If there is no stayAwake lock present and there is a requestClose lock,
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// we should close now.
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if (this._awakeLocks.size === 0 && this._closeLocks.size !== 0) {
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if (typeof this.onclose === 'function') {
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this.onclose();
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} else {
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console.error('CloseLockManager: ' +
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'close should be triggered now but no callback attached.');
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}
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}
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};
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exports.CloseLockManager = CloseLockManager;
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exports.CloseLock = CloseLock;
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})(window);
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