mojo/application_manager/background_shell_application_loader.h

   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 #ifndef MOJO_APPLICATION_MANAGER_BACKGROUND_SHELL_APPLICATION_LOADER_H_
   6 #define MOJO_APPLICATION_MANAGER_BACKGROUND_SHELL_APPLICATION_LOADER_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9 #include "base/message_loop/message_loop.h"
  10 #include "base/synchronization/waitable_event.h"
  11 #include "base/threading/simple_thread.h"
  12 #include "mojo/application_manager/application_loader.h"
  13
  14 namespace mojo {
  15
  16 // TODO(tim): Eventually this should be Android-only to support services
  17 // that we need to bundle with the shell (such as NetworkService). Perhaps
  18 // we should move it to shell/ as well.
  19 class MOJO_APPLICATION_MANAGER_EXPORT BackgroundShellApplicationLoader
  20     : public ApplicationLoader,
  21       public base::DelegateSimpleThread::Delegate {
  22  public:
  23   BackgroundShellApplicationLoader(scoped_ptr<ApplicationLoader> real_loader,
  24                                    const std::string& thread_name,
  25                                    base::MessageLoop::Type message_loop_type);
  26   virtual ~BackgroundShellApplicationLoader();
  27
  28   // ApplicationLoader overrides:
  29   virtual void Load(ApplicationManager* manager,
  30                     const GURL& url,
  31                     scoped_refptr<LoadCallbacks> callbacks) OVERRIDE;
  32   virtual void OnApplicationError(ApplicationManager* manager,
  33                                   const GURL& url) OVERRIDE;
  34
  35  private:
  36   class BackgroundLoader;
  37
  38   // |base::DelegateSimpleThread::Delegate| method:
  39   virtual void Run() OVERRIDE;
  40
  41   // These functions are exected on the background thread. They call through
  42   // to |background_loader_| to do the actual loading.
  43   // TODO: having this code take a |manager| is fragile (as ApplicationManager
  44   // isn't thread safe).
  45   void LoadOnBackgroundThread(ApplicationManager* manager,
  46                               const GURL& url,
  47                               ScopedMessagePipeHandle* shell_handle);
  48   void OnApplicationErrorOnBackgroundThread(ApplicationManager* manager,
  49                                             const GURL& url);
  50   bool quit_on_shutdown_;
  51   scoped_ptr<ApplicationLoader> loader_;
  52
  53   const base::MessageLoop::Type message_loop_type_;
  54   const std::string thread_name_;
  55
  56   // Created on |thread_| during construction of |this|. Protected against
  57   // uninitialized use by |message_loop_created_|, and protected against
  58   // use-after-free by holding a reference to the thread-safe object. Note
  59   // that holding a reference won't hold |thread_| from exiting.
  60   scoped_refptr<base::TaskRunner> task_runner_;
  61   base::WaitableEvent message_loop_created_;
  62
  63   // Lives on |thread_|.
  64   base::Closure quit_closure_;
  65
  66   scoped_ptr<base::DelegateSimpleThread> thread_;
  67
  68   // Lives on |thread_|. Trivial interface that calls through to |loader_|.
  69   BackgroundLoader* background_loader_;
  70
  71   DISALLOW_COPY_AND_ASSIGN(BackgroundShellApplicationLoader);
  72 };
  73
  74 }  // namespace mojo
  75
  76 #endif  // MOJO_APPLICATION_MANAGER_BACKGROUND_SHELL_APPLICATION_LOADER_H_