Refactor ArcSessionRunner part 1.

components/arc/arc_bridge_service_impl.h

-// Copyright 2015 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 COMPONENTS_ARC_ARC_BRIDGE_SERVICE_IMPL_H_
-#define COMPONENTS_ARC_ARC_BRIDGE_SERVICE_IMPL_H_
-
-#include <memory>
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "base/time/time.h"
-#include "base/timer/timer.h"
-#include "components/arc/arc_bridge_service.h"
-#include "components/arc/arc_session_observer.h"
-
-template <typename T>
-class scoped_refptr;
-
-namespace base {
-class TaskRunner;
-}  // namespace base
-
-namespace arc {
-
-class ArcSession;
-
-// Real IPC based ArcBridgeService that is used in production.
-class ArcBridgeServiceImpl : public ArcBridgeService,
-                             public ArcSessionObserver {
- public:
-  // This is the factory interface to inject ArcSession instance
-  // for testing purpose.
-  using ArcSessionFactory = base::Callback<std::unique_ptr<ArcSession>()>;
-
-  explicit ArcBridgeServiceImpl(
-      const scoped_refptr<base::TaskRunner>& blocking_task_runner);
-  ~ArcBridgeServiceImpl() override;
-
-  // ArcBridgeService overrides:
-  void RequestStart() override;
-  void RequestStop() override;
-  void OnShutdown() override;
-
-  // Inject a factory to create ArcSession instance for testing purpose.
-  // |factory| must not be null.
-  void SetArcSessionFactoryForTesting(const ArcSessionFactory& factory);
-
-  // Returns the current ArcSession instance for testing purpose.
-  ArcSession* GetArcSessionForTesting() { return arc_session_.get(); }
-
-  // Normally, automatic restarting happens after a short delay. When testing,
-  // however, we'd like it to happen immediately to avoid adding unnecessary
-  // delays.
-  void SetRestartDelayForTesting(const base::TimeDelta& restart_delay);
-
- private:
-  // Starts to run an ARC instance.
-  void StartArcSession();
-
-  // Stops the running instance.
-  void StopInstance();
-
-  // ArcSessionObserver:
-  void OnSessionReady() override;
-  void OnSessionStopped(StopReason reason) override;
-
-  // Whether a client requests to run session or not.
-  bool running_ = false;
-
-  // Instead of immediately trying to restart the container, give it some time
-  // to finish tearing down in case it is still in the process of stopping.
-  base::TimeDelta restart_delay_;
-  base::OneShotTimer restart_timer_;
-
-  // Factory to inject a fake ArcSession instance for testing.
-  ArcSessionFactory factory_;
-
-  // ArcSession object for currently running ARC instance. This should be
-  // nullptr if the state is STOPPED, otherwise non-nullptr.
-  std::unique_ptr<ArcSession> arc_session_;
-
-  // WeakPtrFactory to use callbacks.
-  base::WeakPtrFactory<ArcBridgeServiceImpl> weak_ptr_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(ArcBridgeServiceImpl);
-};
-
-}  // namespace arc
-
-#endif  // COMPONENTS_ARC_ARC_BRIDGE_SERVICE_IMPL_H_