1 files changed, 57 insertions, 0 deletions
diff --git a/webkit/glue/devtools/js/devtools_callback.js b/webkit/glue/devtools/js/devtools_callback.js
new file mode 100644
index 0000000..c7c1482
--- /dev/null
+++ b/webkit/glue/devtools/js/devtools_callback.js
@@ -0,0 +1,57 @@
+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @fileoverview Generic callback manager.
+ */
+goog.provide('devtools.Callback');
+
+
+/**
+ * Generic callback support as a singleton object.
+ * @constructor
+ */
+devtools.Callback = function() {
+  this.lastCallbackId_ = 0;
+  this.callbacks_ = {};
+};
+
+
+/**
+ * Assigns id to a callback.
+ * @param {Function} callback Callback to assign id to.
+ * @return {number} Callback id.
+ */
+devtools.Callback.prototype.wrap = function(callback) {
+  var callbackId = this.lastCallbackId_++;
+  this.callbacks_[callbackId] = callback;
+  return callbackId;
+};
+
+
+/**
+ * Executes callback with the given id.
+ * @param {callbackId} callbackId Id of a callback to call.
+ */
+devtools.Callback.prototype.processCallback = function(callbackId,
+    opt_vararg) {
+  var args = Array.prototype.slice.call(arguments, 1);
+  var callback = this.callbacks_[callbackId];
+  callback.apply(null, args);
+  delete this.callbacks_[callbackId];
+};
+
+
+/**
+ * @type {devtools.Callback} Callback support singleton.
+ * @private
+ */
+devtools.Callback.INSTANCE_ = new devtools.Callback();
+
+devtools.Callback.wrap = goog.bind(
+    devtools.Callback.INSTANCE_.wrap,
+    devtools.Callback.INSTANCE_);
+devtools.Callback.processCallback = goog.bind(
+    devtools.Callback.INSTANCE_.processCallback,
+    devtools.Callback.INSTANCE_);