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

athena/content/delegate/app_content_control_delegate_impl.cc

+// 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.
+
+#include "athena/content/public/app_content_control_delegate.h"
+
+#include "content/public/browser/render_view_host.h"
+#include "content/public/browser/site_instance.h"
+#include "content/public/browser/web_contents.h"
+#include "extensions/browser/api/app_runtime/app_runtime_api.h"
+#include "extensions/browser/extension_registry.h"
+#include "extensions/common/constants.h"
+
+namespace athena {
+
+class AppContentControlDelegateImpl : public AppContentControlDelegate {
+ public:
+  AppContentControlDelegateImpl() {}
+  virtual ~AppContentControlDelegateImpl() {}
+
+  // AppContentControlDelegate:
+  virtual bool UnloadApplication(
+      const std::string& app_id,
+      content::BrowserContext* browser_context) OVERRIDE;
+  virtual bool RestartApplication(
+      const std::string& app_id,
+      content::BrowserContext* browser_context) OVERRIDE;
+  virtual std::string GetApplicationID(
+      content::WebContents* web_contents) OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AppContentControlDelegateImpl);
+};
+
+bool AppContentControlDelegateImpl::UnloadApplication(
+    const std::string& app_id,
+    content::BrowserContext* browser_context) {
+  // TODO(skuhne): Use the extension system to unload
+  // (|ExtensionService::TerminateExtension|) once it becomes available in
+  // Athena.
+  return false;
+}
+
+bool AppContentControlDelegateImpl::RestartApplication(
+    const std::string& app_id,
+    content::BrowserContext* browser_context) {
+  // TODO(skuhne): As soon as the ExtensionSystem can be used, we should use the
+  // proper commands here for restarting.
+  const extensions::Extension* extension =
+      extensions::ExtensionRegistry::Get(browser_context)->GetExtensionById(
+          app_id, extensions::ExtensionRegistry::EVERYTHING);
+  DCHECK(extension);
+  extensions::AppRuntimeEventRouter::DispatchOnLaunchedEvent(browser_context,
+                                                             extension);
+  return true;
+}
+
+// Get the extension Id from a given |web_contents|.
+std::string AppContentControlDelegateImpl::GetApplicationID(
+    content::WebContents* web_contents) {
+  content::RenderViewHost* render_view_host = web_contents->GetRenderViewHost();
+  // This works for both apps and extensions because the site has been
+  // normalized to the extension URL for hosted apps.
+  content::SiteInstance* site_instance = render_view_host->GetSiteInstance();
+  if (!site_instance)
+    return std::string();
+
+  const GURL& site_url = site_instance->GetSiteURL();
+
+  if (!site_url.SchemeIs(extensions::kExtensionScheme))
+    return std::string();
+
+  return site_url.host();
+}
+
+// static
+AppContentControlDelegate*
+AppContentControlDelegate::CreateAppContentControlDelegate() {
+  return new AppContentControlDelegateImpl;
+}
+
+}  // namespace athena