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      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_
     77