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gaia/apps/system/js/cpu_manager.js

@@ -0,0 +1,49 @@
+'use strict';
+
+/* global CpuWakeLockManager */
+
+(function(exports) {
+  /**
+   * CpuManager is a tiny baby that does nothing except set the
+   * |cpuSleepAllowed| property on mozPower.
+   * But, it would probably grow up as all Gaia script do.
+   */
+  var CpuManager = function CpuManager() {
+    this._wakeLockManager = null;
+    this._started = false;
+  };
+
+  CpuManager.prototype.start = function() {
+    if (this._started) {
+      throw new Error(
+        'CpuManager: should not be start()\'ed twice.');
+    }
+
+    if (!navigator.mozPower) {
+      return;
+    }
+    this._started = true;
+
+    this._wakeLockManager = new CpuWakeLockManager();
+    this._wakeLockManager.onwakelockchange =
+      this._handleWakeLockChange.bind(this);
+    this._wakeLockManager.start();
+  };
+
+  CpuManager.prototype.stop = function() {
+    if (!this._started) {
+      throw new Error('CpuManager: ' +
+        'Instance was never start()\'ed but stop() is called.');
+    }
+    this._started = false;
+
+    this._wakeLockManager.stop();
+    this._wakeLockManager = null;
+  };
+
+  CpuManager.prototype._handleWakeLockChange = function(isHeld) {
+    navigator.mozPower.cpuSleepAllowed = !isHeld;
+  };
+
+  exports.CpuManager = CpuManager;
+}(window));