Bug 731779: Integrate the Add-on SDK loader and API libraries into Firefox (uplifting from addon-sdk a16bbd5772880b578a939eeb65102bca6560d494)

addon-sdk/source/lib/sdk/timers.js

@@ -0,0 +1,53 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+'use strict';
+
+module.metadata = {
+  "stability": "stable"
+};
+
+const { CC, Ci } = require('chrome');
+const { when: unload } = require('./system/unload');
+
+const { TYPE_ONE_SHOT, TYPE_REPEATING_SLACK } = Ci.nsITimer;
+const Timer = CC('@mozilla.org/timer;1', 'nsITimer');
+const timers = Object.create(null);
+
+// Last timer id.
+let lastID = 0;
+
+// Sets typer either by timeout or by interval
+// depending on a given type.
+function setTimer(type, callback, delay) {
+  let id = ++ lastID;
+  let timer = timers[id] = Timer();
+  let args = Array.slice(arguments, 3);
+  timer.initWithCallback({
+    notify: function notify() {
+      try {
+        if (type === TYPE_ONE_SHOT)
+          delete timers[id];
+        callback.apply(null, args);
+      }
+      catch(error) {
+        console.exception(error);
+      }
+    }
+  }, delay || 0, type);
+  return id;
+}
+
+function unsetTimer(id) {
+  let timer = timers[id];
+  delete timers[id];
+  if (timer)
+    timer.cancel();
+}
+
+exports.setTimeout = setTimer.bind(null, TYPE_ONE_SHOT);
+exports.setInterval = setTimer.bind(null, TYPE_REPEATING_SLACK);
+exports.clearTimeout = unsetTimer.bind(null);
+exports.clearInterval = unsetTimer.bind(null);
+
+unload(function() { Object.keys(timers).forEach(unsetTimer) });