1 files changed, 47 insertions, 0 deletions
diff --git a/devtools/server/content-globals.js b/devtools/server/content-globals.js
new file mode 100644
index 000000000..2c59552e7
--- /dev/null
+++ b/devtools/server/content-globals.js
@@ -0,0 +1,47 @@
+/* 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";
+
+const { Ci } = require("chrome");
+const Services = require("Services");
+
+var globalsCache = {};
+
+exports.addContentGlobal = function (options) {
+  if (!options || !options.global || !options["inner-window-id"]) {
+    throw Error("Invalid arguments");
+  }
+  let cache = getGlobalCache(options["inner-window-id"]);
+  cache.push(options.global);
+  return undefined;
+};
+
+exports.getContentGlobals = function (options) {
+  if (!options || !options["inner-window-id"]) {
+    throw Error("Invalid arguments");
+  }
+  return Array.slice(globalsCache[options["inner-window-id"]] || []);
+};
+
+exports.removeContentGlobal = function (options) {
+  if (!options || !options.global || !options["inner-window-id"]) {
+    throw Error("Invalid arguments");
+  }
+  let cache = getGlobalCache(options["inner-window-id"]);
+  let index = cache.indexOf(options.global);
+  cache.splice(index, 1);
+  return undefined;
+};
+
+function getGlobalCache(aInnerWindowID) {
+  return globalsCache[aInnerWindowID] = globalsCache[aInnerWindowID] || [];
+}
+
+// when the window is destroyed, eliminate the associated globals cache
+if (!isWorker) {
+  Services.obs.addObserver(function observer(subject, topic, data) {
+    let id = subject.QueryInterface(Ci.nsISupportsPRUint64).data;
+    delete globalsCache[id];
+  }, "inner-window-destroyed", false);
+}