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// Copyright (c) 2012 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 REMOTING_HOST_CHROMOTING_HOST_CONTEXT_H_
#define REMOTING_HOST_CHROMOTING_HOST_CONTEXT_H_
#include <memory>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "build/build_config.h"
namespace base {
class SingleThreadTaskRunner;
} // namespace base
namespace net {
class URLRequestContextGetter;
} // namespace net
namespace remoting {
class AutoThreadTaskRunner;
// A class that manages threads and running context for the chromoting host
// process. This class is virtual only for testing purposes (see below).
class ChromotingHostContext {
public:
// Create threads and URLRequestContextGetter for use by a host.
// During shutdown the caller should tear-down the ChromotingHostContext and
// then continue to run until |ui_task_runner| is no longer referenced.
// nullptr is returned if any threads fail to start.
static std::unique_ptr<ChromotingHostContext> Create(
scoped_refptr<AutoThreadTaskRunner> ui_task_runner);
#if defined(OS_CHROMEOS)
// Attaches task runners to the relevant browser threads for the chromoting
// host. Must be called on the UI thread of the browser process.
// remoting::UrlRequestContextGetter returns ContainerURLRequestContext under
// the hood which spawns two new threads per instance. Since
// ChromotingHostContext can be destroyed from any thread, as its owner
// (It2MeHost) is ref-counted, joining the created threads during shutdown
// violates the "Disallow IO" thread restrictions on some task runners (e.g.
// the IO Thread of the browser process).
// Instead, we re-use the |url_request_context_getter| in the browser process.
static std::unique_ptr<ChromotingHostContext> CreateForChromeOS(
scoped_refptr<net::URLRequestContextGetter> url_request_context_getter,
scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
scoped_refptr<base::SingleThreadTaskRunner> file_task_runner);
#endif // defined(OS_CHROMEOS)
~ChromotingHostContext();
std::unique_ptr<ChromotingHostContext> Copy();
// Task runner for the thread that is used for the UI.
scoped_refptr<AutoThreadTaskRunner> ui_task_runner() const;
// Task runner for the thread used for audio capture and encoding.
scoped_refptr<AutoThreadTaskRunner> audio_task_runner() const;
// Task runner for the thread that is used for blocking file
// IO. This thread is used by the URLRequestContext to read proxy
// configuration and by NatConfig to read policy configs.
scoped_refptr<AutoThreadTaskRunner> file_task_runner() const;
// Task runner for the thread that is used by the InputInjector.
//
// TODO(sergeyu): Do we need a separate thread for InputInjector?
// Can we use some other thread instead?
scoped_refptr<AutoThreadTaskRunner> input_task_runner() const;
// Task runner for the thread used for network IO. This thread runs
// a libjingle message loop, and is the only thread on which
// libjingle code may be run.
scoped_refptr<AutoThreadTaskRunner> network_task_runner() const;
// Task runner for the thread used by the ScreenRecorder to capture
// the screen.
scoped_refptr<AutoThreadTaskRunner> video_capture_task_runner() const;
// Task runner for the thread used to encode video streams.
scoped_refptr<AutoThreadTaskRunner> video_encode_task_runner() const;
scoped_refptr<net::URLRequestContextGetter> url_request_context_getter()
const;
private:
ChromotingHostContext(
scoped_refptr<AutoThreadTaskRunner> ui_task_runner,
scoped_refptr<AutoThreadTaskRunner> audio_task_runner,
scoped_refptr<AutoThreadTaskRunner> file_task_runner,
scoped_refptr<AutoThreadTaskRunner> input_task_runner,
scoped_refptr<AutoThreadTaskRunner> network_task_runner,
scoped_refptr<AutoThreadTaskRunner> video_capture_task_runner,
scoped_refptr<AutoThreadTaskRunner> video_encode_task_runner,
scoped_refptr<net::URLRequestContextGetter> url_request_context_getter);
// Caller-supplied UI thread. This is usually the application main thread.
scoped_refptr<AutoThreadTaskRunner> ui_task_runner_;
// Thread for audio capture and encoding.
scoped_refptr<AutoThreadTaskRunner> audio_task_runner_;
// Thread for I/O operations.
scoped_refptr<AutoThreadTaskRunner> file_task_runner_;
// Thread for input injection.
scoped_refptr<AutoThreadTaskRunner> input_task_runner_;
// Thread for network operations.
scoped_refptr<AutoThreadTaskRunner> network_task_runner_;
// Thread for screen capture.
scoped_refptr<AutoThreadTaskRunner> video_capture_task_runner_;
// Thread for video encoding.
scoped_refptr<AutoThreadTaskRunner> video_encode_task_runner_;
// Serves URLRequestContexts that use the network and UI task runners.
scoped_refptr<net::URLRequestContextGetter> url_request_context_getter_;
DISALLOW_COPY_AND_ASSIGN(ChromotingHostContext);
};
} // namespace remoting
#endif // REMOTING_HOST_CHROMOTING_HOST_CONTEXT_H_
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