athena/content/app_activity_registry.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "athena/content/app_activity_registry.h"
   6
   7 #include "athena/activity/public/activity_manager.h"
   8 #include "athena/content/app_activity.h"
   9 #include "athena/content/app_activity_proxy.h"
  10 #include "athena/content/public/app_registry.h"
  11 #include "athena/extensions/public/extensions_delegate.h"
  12 #include "athena/resource_manager/public/resource_manager.h"
  13 #include "athena/wm/public/window_list_provider.h"
  14 #include "athena/wm/public/window_manager.h"
  15 #include "base/bind.h"
  16 #include "base/location.h"
  17 #include "base/single_thread_task_runner.h"
  18 #include "base/thread_task_runner_handle.h"
  19 #include "ui/aura/window.h"
  20 #include "ui/views/view.h"
  21 #include "ui/views/widget/widget.h"
  22
  23 namespace athena {
  24
  25 AppActivityRegistry::AppActivityRegistry(
  26     const std::string& app_id,
  27     content::BrowserContext* browser_context) :
  28       app_id_(app_id),
  29       browser_context_(browser_context),
  30       unloaded_activity_proxy_(NULL) {}
  31
  32 AppActivityRegistry::~AppActivityRegistry() {
  33   CHECK(activity_list_.empty());
  34   if (unloaded_activity_proxy_)
  35     ActivityManager::Get()->RemoveActivity(unloaded_activity_proxy_);
  36   DCHECK(!unloaded_activity_proxy_);
  37 }
  38
  39 void AppActivityRegistry::RegisterAppActivity(AppActivity* app_activity) {
  40   // The same window should never be added twice.
  41   CHECK(std::find(activity_list_.begin(),
  42                   activity_list_.end(),
  43                   app_activity) == activity_list_.end());
  44   activity_list_.push_back(app_activity);
  45 }
  46
  47 void AppActivityRegistry::UnregisterAppActivity(AppActivity* app_activity) {
  48   // It is possible that a detach gets called without ever being attached.
  49   std::vector<AppActivity*>::iterator it =
  50       std::find(activity_list_.begin(), activity_list_.end(), app_activity);
  51   if (it == activity_list_.end())
  52     return;
  53
  54   activity_list_.erase(it);
  55   // When the last window gets destroyed and there is no proxy to restart, we
  56   // delete ourselves.
  57   if (activity_list_.empty() && !unloaded_activity_proxy_) {
  58     AppRegistry::Get()->RemoveAppActivityRegistry(this);
  59     // after this call this object should be gone.
  60   }
  61 }
  62
  63 AppActivity* AppActivityRegistry::GetAppActivityAt(size_t index) {
  64   if (index >= activity_list_.size())
  65     return NULL;
  66   return activity_list_[index];
  67 }
  68
  69 void AppActivityRegistry::Unload() {
  70   CHECK(!unloaded_activity_proxy_);
  71   DCHECK(!activity_list_.empty());
  72   // In order to allow an entire application to unload we require that all of
  73   // its activities are marked as unloaded.
  74   for (std::vector<AppActivity*>::iterator it = activity_list_.begin();
  75        it != activity_list_.end(); ++it) {
  76     if ((*it)->GetCurrentState() != Activity::ACTIVITY_UNLOADED)
  77       return;
  78   }
  79
  80   // Create an activity proxy which can be used to re-activate the app. Insert
  81   // the proxy then into the activity stream at the location of the (newest)
  82   // current activity.
  83   unloaded_activity_proxy_ = new AppActivityProxy(GetMruActivity(), this);
  84   ActivityManager::Get()->AddActivity(unloaded_activity_proxy_);
  85
  86   // This function can be called through an observer call. When that happens,
  87   // several activities will be closed / started. That can then cause a crash.
  88   // We postpone therefore the activity destruction till after the observer is
  89   // done.
  90   base::ThreadTaskRunnerHandle::Get()->PostTask(
  91       FROM_HERE,
  92       base::Bind(&AppActivityRegistry::DelayedUnload, base::Unretained(this)));
  93 }
  94
  95 void AppActivityRegistry::ProxyDestroyed(AppActivityProxy* proxy) {
  96   DCHECK_EQ(unloaded_activity_proxy_, proxy);
  97   unloaded_activity_proxy_ = NULL;
  98   if (activity_list_.empty()) {
  99     AppRegistry::Get()->RemoveAppActivityRegistry(this);
 100     // |This| is gone now.
 101   }
 102 }
 103
 104 void AppActivityRegistry::RestartApplication(AppActivityProxy* proxy) {
 105   DCHECK_EQ(unloaded_activity_proxy_, proxy);
 106   // Restart the application. Note that the first created app window will make
 107   // sure that the proxy gets deleted - after - the new activity got moved
 108   // to the proxies activity location.
 109   ExtensionsDelegate::Get(browser_context_)->LaunchApp(app_id_);
 110 }
 111
 112 void AppActivityRegistry::DelayedUnload() {
 113   if (!ExtensionsDelegate::Get(browser_context_)->UnloadApp(app_id_)) {
 114     while(!activity_list_.empty())
 115       Activity::Delete(activity_list_.back());
 116   }
 117 }
 118
 119 AppActivity* AppActivityRegistry::GetMruActivity() {
 120   DCHECK(activity_list_.size());
 121   WindowListProvider* window_list_provider =
 122       WindowManager::Get()->GetWindowListProvider();
 123   const aura::Window::Windows& children =
 124       window_list_provider->GetWindowList();
 125   // Find the first window in the container which is part of the application.
 126   for (aura::Window::Windows::const_iterator child_iterator = children.begin();
 127       child_iterator != children.end(); ++child_iterator) {
 128     for (std::vector<AppActivity*>::iterator app_iterator =
 129              activity_list_.begin();
 130          app_iterator != activity_list_.end(); ++app_iterator) {
 131       if (*child_iterator == (*app_iterator)->GetWindow())
 132         return *app_iterator;
 133     }
 134   }
 135   NOTREACHED() << "The application does not get tracked by the mru list";
 136   return NULL;
 137 }
 138
 139 }  // namespace athena