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io_thread.h

// Copyright (c) 2010 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 CHROME_BROWSER_IO_THREAD_H_
#define CHROME_BROWSER_IO_THREAD_H_

#include <vector>

#include "base/basictypes.h"
#include "base/ref_counted.h"
#include "base/scoped_ptr.h"
#include "chrome/browser/browser_process_sub_thread.h"
#include "chrome/browser/net/chrome_network_delegate.h"
#include "chrome/common/net/predictor_common.h"
#include "chrome/browser/net/connect_interceptor.h"
#include "net/base/host_resolver.h"
#include "net/base/network_change_notifier.h"

class ChromeNetLog;
class ListValue;

namespace chrome_browser_net {
class Predictor;
}  // namespace chrome_browser_net

namespace net {
class HttpAuthHandlerFactory;
class URLSecurityManager;
}  // namespace net

class IOThread : public BrowserProcessSubThread {
 public:
  struct Globals {
    scoped_ptr<ChromeNetLog> net_log;
    // TODO(willchan): Stop reference counting HostResolver.  It's owned by
    // IOThread now.
    scoped_refptr<net::HostResolver> host_resolver;
    scoped_ptr<net::HttpAuthHandlerFactory> http_auth_handler_factory;
    scoped_ptr<net::URLSecurityManager> url_security_manager;
    ChromeNetworkDelegate network_delegate;
  };

  IOThread();

  virtual ~IOThread();

  // Can only be called on the IO thread.
  Globals* globals();

  // Initializes the network predictor, which induces DNS pre-resolution and/or
  // TCP/IP preconnections.  |prefetching_enabled| indicates whether or not DNS
  // prefetching should be enabled, and |preconnect_enabled| controls whether
  // TCP/IP preconnection is enabled.  This should be called by the UI thread.
  // It will post a task to the IO thread to perform the actual initialization.
  void InitNetworkPredictor(bool prefetching_enabled,
                            base::TimeDelta max_dns_queue_delay,
                            size_t max_concurrent,
                            const chrome_common_net::UrlList& startup_urls,
                            ListValue* referral_list,
                            bool preconnect_enabled);

  // Handles changing to On The Record mode.  Posts a task for this onto the
  // IOThread's message loop.
  void ChangedToOnTheRecord();

 protected:
  virtual void Init();
  virtual void CleanUp();
  virtual void CleanUpAfterMessageLoopDestruction();

 private:
  net::HttpAuthHandlerFactory* CreateDefaultAuthHandlerFactory(
      net::HostResolver* resolver);

  void InitNetworkPredictorOnIOThread(
      bool prefetching_enabled,
      base::TimeDelta max_dns_queue_delay,
      size_t max_concurrent,
        const chrome_common_net::UrlList& startup_urls,

      ListValue* referral_list,
      bool preconnect_enabled);

  void ChangedToOnTheRecordOnIOThread();

  // These member variables are basically global, but their lifetimes are tied
  // to the IOThread.  IOThread owns them all, despite not using scoped_ptr.
  // This is because the destructor of IOThread runs on the wrong thread.  All
  // member variables should be deleted in CleanUp(), except ChromeNetLog
  // which is deleted later in CleanUpAfterMessageLoopDestruction().

  // These member variables are initialized in Init() and do not change for the
  // lifetime of the IO thread.

  Globals* globals_;

  // This variable is only meaningful during shutdown. It is used to defer
  // deletion of the NetLog to CleanUpAfterMessageLoopDestruction() even
  // though |globals_| is reset by CleanUp().
  scoped_ptr<ChromeNetLog> deferred_net_log_to_delete_;

  // Observer that logs network changes to the ChromeNetLog.
  scoped_ptr<net::NetworkChangeNotifier::Observer> network_change_observer_;

  // These member variables are initialized by a task posted to the IO thread,
  // which gets posted by calling certain member functions of IOThread.

  // Note: we user explicit pointers rather than smart pointers to be more
  // explicit about destruction order, and ensure that there is no chance that
  // these observers would be used accidentally after we have begun to tear
  // down.
  chrome_browser_net::ConnectInterceptor* speculative_interceptor_;
  net::HostResolver::Observer* prefetch_observer_;
  chrome_browser_net::Predictor* predictor_;

  DISALLOW_COPY_AND_ASSIGN(IOThread);
};

#endif  // CHROME_BROWSER_IO_THREAD_H_

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