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gaia/apps/system/js/scheduler.js

@@ -0,0 +1,55 @@
+/* global BaseModule */
+'use strict';
+
+(function() {
+  var Scheduler = function() {
+  };
+  Scheduler.SERVICES = [
+    'schedule'
+  ];
+  BaseModule.create(Scheduler, {
+    name: 'Scheduler',
+    DEBUG: false,
+    _start: function() {
+      this._queue = [];
+      this.hold(); // Hold on start until the parent tells us to release.
+    },
+    hold: function() {
+      this._busyState = true;
+    },
+    release: function() {
+      if (this._busyState) {
+        document.body.setAttribute('ready-state', 'visuallyLoaded');
+        window.performance.mark('visuallyLoaded');
+      }
+      this._busyState = false;
+      if (this._queue.length) {
+        this.execute();
+      }
+    },
+    execute: function() {
+      var length = this._queue.length;
+      this.debug('process operations in the schedule pool: ' + length);
+      this._queue.forEach(function(operation) {
+        operation.request();
+        operation.resolve();
+      });
+      this._queue = [];
+    },
+    schedule: function(request) {
+      return new Promise((resolve) => {
+        if (this._busyState) {
+          this.debug('busy loading, put the operation in the pool.');
+          this._queue.push({
+            resolve: resolve,
+            request: request
+          });
+        } else {
+          this.debug('not blocking, execute right away');
+          request();
+          resolve();
+        }
+      });
+    }
+  });
+}());