Athena: Adding basic resource management framework (un-/re-loading) of V2 applications

athena/content/public/app_registry.h

+// Copyright 2014 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.
+
+#ifndef ATHENA_CONTENT_PUBLIC_APP_REGISTRY_H_
+#define ATHENA_CONTENT_PUBLIC_APP_REGISTRY_H_
+
+#include <string>
+#include <vector>
+
+#include "athena/athena_export.h"
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace content {
+class BrowserContext;
+}
+
+namespace athena {
+
+class AppActivityRegistry;
+class AppContentControlDelegate;
+class AppRegistryImpl;
+
+// This class holds for each application, held by a user, a list of activities.
+// The list of activities can be retrieved as |AppActivityRegistry|. It is used
+// to associate activities with applications and allow the resource manager to
+// (re)start and stop applications.
+class ATHENA_EXPORT AppRegistry {
+ public:
+  // Creates the AppRegistry instance.
+  static void Create();
+
+  // Gets the instance of the controller.
+  static AppRegistry* Get();
+
+  // Shuts down the registry (all applications should be shut down by then).
+  static void ShutDown();
+
+  // Overrides the used AppContentDelegate. This function will own it
+  // afterwards. A value of NULL is invalid.
+  virtual void SetDelegate(AppContentControlDelegate* delegate) = 0;
+
+  // Retrieves the application content delegate. The ownership remains with this
+  // class.
+  virtual AppContentControlDelegate* GetDelegate() = 0;
+
+  // Returns an |AppActivityRegistry| for a given activity |app_id| and
+  // |browser_context|.
+  virtual AppActivityRegistry* GetAppActivityRegistry(
+      const std::string& app_id,
+      content::BrowserContext* browser_context) = 0;
+
+  // Returns the number of registered applications.
+  virtual int NumberOfApplications() const = 0;
+
+ protected:
+  // Only the |AppActivityRegistry| can remove itself.
+  friend AppActivityRegistry;
+
+  // Removes an activity registry for an application from the list of known
+  // applications.
+  virtual void RemoveAppActivityRegistry(AppActivityRegistry* registry) = 0;
+
+  // Constructor and destructor can only be called by the implementing class.
+  AppRegistry();
+  virtual ~AppRegistry();
+};
+
+}  // namespace athena
+
+#endif  // ATHENA_CONTENT_PUBLIC_APP_REGISTRY_H_