Move services/shell to services/service_manager

services/shell/public/cpp/service_context_ref.h

-// Copyright 2016 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 SERVICES_SHELL_PUBLIC_CPP_SERVICE_CONTEXT_REF_H_
-#define SERVICES_SHELL_PUBLIC_CPP_SERVICE_CONTEXT_REF_H_
-
-#include <memory>
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "base/memory/weak_ptr.h"
-
-namespace shell {
-
-class ServiceContextRefImpl;
-
-// An interface implementation can keep this object as a member variable to
-// hold a reference to the ServiceContext, keeping it alive as long as the
-// bound implementation exists.
-//
-// This class is safe to use on any thread and instances may be passed to other
-// threads. However, each instance should only be used on one thread at a time,
-// otherwise there'll be races between the AddRef resulting from cloning and
-// destruction.
-class ServiceContextRef {
- public:
-  virtual ~ServiceContextRef() {}
-
-  virtual std::unique_ptr<ServiceContextRef> Clone() = 0;
-};
-
-class ServiceContextRefFactory {
- public:
-  // |quit_closure| is called whenever the last ref is destroyed.
-  explicit ServiceContextRefFactory(const base::Closure& quit_closure);
-  ~ServiceContextRefFactory();
-
-  std::unique_ptr<ServiceContextRef> CreateRef();
-
-  bool HasNoRefs() const { return !ref_count_; }
-
- private:
-  friend ServiceContextRefImpl;
-
-  // Called from ServiceContextRefImpl.
-  void AddRef();
-  void Release();
-
-  const base::Closure quit_closure_;
-  int ref_count_ = 0;
-  base::WeakPtrFactory<ServiceContextRefFactory> weak_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(ServiceContextRefFactory);
-};
-
-}  // namespace shell
-
-#endif  // SERVICES_SHELL_PUBLIC_CPP_SERVICE_CONTEXT_REF_H_