// Copyright (c) 2014 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 CONTENT_CHILD_RESOURCE_SCHEDULING_FILTER_H_
#define CONTENT_CHILD_RESOURCE_SCHEDULING_FILTER_H_

#include "base/containers/hash_tables.h"
#include "base/memory/weak_ptr.h"
#include "base/single_thread_task_runner.h"
#include "content/common/content_export.h"
#include "ipc/message_filter.h"

namespace content {
class ResourceDispatcher;

// This filter is used to dispatch resource messages on a specific
// SingleThreadTaskRunner to facilitate task scheduling.
class CONTENT_EXPORT ResourceSchedulingFilter : public IPC::MessageFilter {
 public:
  ResourceSchedulingFilter(const scoped_refptr<base::SingleThreadTaskRunner>&
                               main_thread_task_runner,
                           ResourceDispatcher* resource_dispatcher);

  // IPC::MessageFilter overrides:
  bool OnMessageReceived(const IPC::Message& message) override;

  bool GetSupportedMessageClasses(
      std::vector<uint32>* supported_message_classes) const override;

 protected:
  ~ResourceSchedulingFilter() override;

  void DispatchMessage(const IPC::Message& message);

  scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
  ResourceDispatcher* resource_dispatcher_;  // NOT OWNED
  base::WeakPtrFactory<ResourceSchedulingFilter> weak_ptr_factory_;

 private:
  DISALLOW_COPY_AND_ASSIGN(ResourceSchedulingFilter);
};

}  // namespace content

#endif  // CONTENT_CHILD_RESOURCE_SCHEDULING_FILTER_H_