chromium/content/public/browser/browser_message_filter.h

// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_PUBLIC_BROWSER_BROWSER_MESSAGE_FILTER_H_
#define CONTENT_PUBLIC_BROWSER_BROWSER_MESSAGE_FILTER_H_

#include <stddef.h>
#include <stdint.h>
#include <utility>

#include "base/memory/raw_ptr.h"
#include "base/memory/ref_counted.h"
#include "base/process/process.h"
#include "base/task/sequenced_task_runner.h"
#include "build/build_config.h"
#include "content/common/content_export.h"
#include "content/public/browser/browser_thread.h"
#include "ipc/ipc_channel_proxy.h"

#if BUILDFLAG(IS_WIN)
#include "base/synchronization/lock.h"
#endif

namespace IPC {
class MessageFilter;
}

namespace content {
struct BrowserMessageFilterTraits;

// Base class for message filters in the browser process.  You can receive and
// send messages on any thread.
//
// BrowserMessageFilters are ref-counted, and a reference to them is held by the
// IPC ChannelProxy for which they have been installed, so do not rely on the
// destructor being called on a specific sequence unless you specify otherwise
// in OnDestruct().
class CONTENT_EXPORT BrowserMessageFilter
    : public base::RefCountedThreadSafe<
          BrowserMessageFilter, BrowserMessageFilterTraits>,
      public IPC::Sender { … };

struct BrowserMessageFilterTraits { … };

}  // namespace content

#endif  // CONTENT_PUBLIC_BROWSER_BROWSER_MESSAGE_FILTER_H_