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// 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.
#ifndef CHROME_BROWSER_EXTENSIONS_API_BRAILLE_DISPLAY_PRIVATE_BRAILLE_CONTROLLER_BRLAPI_H_
#define CHROME_BROWSER_EXTENSIONS_API_BRAILLE_DISPLAY_PRIVATE_BRAILLE_CONTROLLER_BRLAPI_H_
#include "base/files/file_path.h"
#include "base/files/file_path_watcher.h"
#include "base/gtest_prod_util.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/singleton.h"
#include "base/observer_list.h"
#include "chrome/browser/extensions/api/braille_display_private/braille_controller.h"
#include "chrome/browser/extensions/api/braille_display_private/brlapi_connection.h"
#include "library_loaders/libbrlapi.h"
namespace extensions {
namespace api {
namespace braille_display_private {
// BrailleController implementation based on libbrlapi from brltty.
class BrailleControllerImpl : public BrailleController {
public:
static BrailleControllerImpl* GetInstance();
virtual scoped_ptr<DisplayState> GetDisplayState() override;
virtual void WriteDots(const std::string& cells) override;
virtual void AddObserver(BrailleObserver* observer) override;
virtual void RemoveObserver(BrailleObserver* observer) override;
private:
// For the unit tests.
friend class BrailleDisplayPrivateApiTest;
friend class MockBrlapiConnection;
BrailleControllerImpl();
virtual ~BrailleControllerImpl();
void TryLoadLibBrlApi();
typedef base::Callback<scoped_ptr<BrlapiConnection>()>
CreateBrlapiConnectionFunction;
// For dependency injection in tests. Sets the function used to create
// brlapi connections.
void SetCreateBrlapiConnectionForTesting(
const CreateBrlapiConnectionFunction& callback);
// Makes the controller try to reconnect (if disconnected) as if the brlapi
// socket directory had changed.
void PokeSocketDirForTesting();
// Tries to connect and starts watching for new brlapi servers.
// No-op if already called.
void StartConnecting();
void StartWatchingSocketDirOnFileThread();
void OnSocketDirChangedOnFileThread(const base::FilePath& path, bool error);
void OnSocketDirChangedOnIOThread();
void TryToConnect();
void ResetRetryConnectHorizon();
void ScheduleTryToConnect();
void Disconnect();
scoped_ptr<BrlapiConnection> CreateBrlapiConnection();
void DispatchKeys();
void DispatchKeyEvent(scoped_ptr<KeyEvent> event);
void DispatchOnDisplayStateChanged(scoped_ptr<DisplayState> new_state);
CreateBrlapiConnectionFunction create_brlapi_connection_function_;
// Manipulated on the IO thread.
LibBrlapiLoader libbrlapi_loader_;
scoped_ptr<BrlapiConnection> connection_;
bool started_connecting_;
bool connect_scheduled_;
base::Time retry_connect_horizon_;
// Manipulated on the UI thread.
ObserverList<BrailleObserver> observers_;
// Manipulated on the FILE thread.
base::FilePathWatcher file_path_watcher_;
friend struct DefaultSingletonTraits<BrailleControllerImpl>;
DISALLOW_COPY_AND_ASSIGN(BrailleControllerImpl);
};
} // namespace braille_display_private
} // namespace api
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_API_BRAILLE_DISPLAY_PRIVATE_BRAILLE_CONTROLLER_BRLAPI_H_
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