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// 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 "base/task.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"
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_;
// 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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