Factor out AppLifetimeMonitor.

AppLifetimeMonitor listens to extension host notifications and observes
ShellWindowRegistry. It sends out notifications when:
- an app starts
- the first shell window opens
- the last shell window closes
- the app stops

BUG=

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=204487

Review URL: https://chromiumcodereview.appspot.com/16412002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@206988 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 129 insertions, 0 deletions

diff --git a/apps/app_lifetime_monitor.cc b/apps/app_lifetime_monitor.cc
new file mode 100644
index 0000000..6c2b9b9
--- /dev/null
+++ b/apps/app_lifetime_monitor.cc
@@ -0,0 +1,129 @@
+// Copyright 2013 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 "apps/app_lifetime_monitor.h"
+
+#include "chrome/browser/extensions/extension_host.h"
+#include "chrome/browser/ui/extensions/shell_window.h"
+#include "chrome/common/chrome_notification_types.h"
+#include "chrome/common/extensions/extension.h"
+#include "content/public/browser/notification_details.h"
+#include "content/public/browser/notification_service.h"
+
+namespace apps {
+
+using extensions::Extension;
+using extensions::ExtensionHost;
+using extensions::ShellWindowRegistry;
+
+AppLifetimeMonitor::AppLifetimeMonitor(Profile* profile)
+    : profile_(profile) {
+  registrar_.Add(
+      this, chrome::NOTIFICATION_EXTENSION_HOST_DID_STOP_LOADING,
+      content::NotificationService::AllSources());
+  registrar_.Add(
+      this, chrome::NOTIFICATION_EXTENSION_HOST_DESTROYED,
+      content::NotificationService::AllSources());
+  registrar_.Add(
+      this, chrome::NOTIFICATION_APP_TERMINATING,
+      content::NotificationService::AllSources());
+
+  ShellWindowRegistry* shell_window_registry =
+      ShellWindowRegistry::Factory::GetForProfile(
+          profile_, false /* create */);
+  DCHECK(shell_window_registry);
+  shell_window_registry->AddObserver(this);
+}
+
+AppLifetimeMonitor::~AppLifetimeMonitor() {}
+
+void AppLifetimeMonitor::AddObserver(Observer* observer) {
+  observers_.AddObserver(observer);
+}
+
+void AppLifetimeMonitor::RemoveObserver(Observer* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+void AppLifetimeMonitor::Observe(int type,
+                                const content::NotificationSource& source,
+                                const content::NotificationDetails& details) {
+  switch (type) {
+    case chrome::NOTIFICATION_EXTENSION_HOST_DID_STOP_LOADING: {
+      ExtensionHost* host = content::Details<ExtensionHost>(details).ptr();
+      const Extension* extension = host->extension();
+      if (!extension || !extension->is_platform_app())
+        return;
+
+      NotifyAppStart(extension->id());
+      break;
+    }
+
+    case chrome::NOTIFICATION_EXTENSION_HOST_DESTROYED: {
+      ExtensionHost* host = content::Details<ExtensionHost>(details).ptr();
+      const Extension* extension = host->extension();
+      if (!extension || !extension->is_platform_app())
+        return;
+
+      NotifyAppStop(extension->id());
+      break;
+    }
+
+    case chrome::NOTIFICATION_APP_TERMINATING: {
+      NotifyChromeTerminating();
+      break;
+    }
+  }
+}
+
+void AppLifetimeMonitor::OnShellWindowAdded(ShellWindow* shell_window) {
+  if (shell_window->window_type() != ShellWindow::WINDOW_TYPE_DEFAULT)
+    return;
+
+  ShellWindowRegistry::ShellWindowList windows =
+      ShellWindowRegistry::Get(shell_window->profile())->
+          GetShellWindowsForApp(shell_window->extension_id());
+  if (windows.size() == 1)
+    NotifyAppActivated(shell_window->extension_id());
+}
+
+void AppLifetimeMonitor::OnShellWindowIconChanged(ShellWindow* shell_window) {}
+
+void AppLifetimeMonitor::OnShellWindowRemoved(ShellWindow* shell_window) {
+  ShellWindowRegistry::ShellWindowList windows =
+      ShellWindowRegistry::Get(shell_window->profile())->
+          GetShellWindowsForApp(shell_window->extension_id());
+  if (windows.empty())
+    NotifyAppDeactivated(shell_window->extension_id());
+}
+
+void AppLifetimeMonitor::Shutdown() {
+  ShellWindowRegistry* shell_window_registry =
+      ShellWindowRegistry::Factory::GetForProfile(
+          profile_, false /* create */);
+  if (shell_window_registry)
+    shell_window_registry->RemoveObserver(this);
+}
+
+void AppLifetimeMonitor::NotifyAppStart(const std::string& app_id) {
+  FOR_EACH_OBSERVER(Observer, observers_, OnAppStart(profile_, app_id));
+}
+
+void AppLifetimeMonitor::NotifyAppActivated(const std::string& app_id) {
+  FOR_EACH_OBSERVER(Observer, observers_, OnAppActivated(profile_, app_id));
+}
+
+void AppLifetimeMonitor::NotifyAppDeactivated(const std::string& app_id) {
+  FOR_EACH_OBSERVER(Observer, observers_, OnAppDeactivated(profile_, app_id));
+}
+
+void AppLifetimeMonitor::NotifyAppStop(const std::string& app_id) {
+  FOR_EACH_OBSERVER(Observer, observers_, OnAppStop(profile_, app_id));
+}
+
+void AppLifetimeMonitor::NotifyChromeTerminating() {
+  FOR_EACH_OBSERVER(Observer, observers_, OnChromeTerminating());
+}
+
+}  // namespace apps