Remove //net (except for Android test stuff) and sdch

net/url_request/url_request_throttler_manager.h

-// 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 NET_URL_REQUEST_URL_REQUEST_THROTTLER_MANAGER_H_
-#define NET_URL_REQUEST_URL_REQUEST_THROTTLER_MANAGER_H_
-
-#include <map>
-#include <set>
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/memory/ref_counted.h"
-#include "base/threading/non_thread_safe.h"
-#include "base/threading/platform_thread.h"
-#include "net/base/net_export.h"
-#include "net/base/network_change_notifier.h"
-#include "net/url_request/url_request_throttler_entry.h"
-#include "url/gurl.h"
-
-namespace net {
-
-class BoundNetLog;
-class NetLog;
-
-// Class that registers URL request throttler entries for URLs being accessed
-// in order to supervise traffic. URL requests for HTTP contents should
-// register their URLs in this manager on each request.
-//
-// URLRequestThrottlerManager maintains a map of URL IDs to URL request
-// throttler entries. It creates URL request throttler entries when new URLs
-// are registered, and does garbage collection from time to time in order to
-// clean out outdated entries. URL ID consists of lowercased scheme, host, port
-// and path. All URLs converted to the same ID will share the same entry.
-class NET_EXPORT URLRequestThrottlerManager
-    : NON_EXPORTED_BASE(public base::NonThreadSafe),
-      public NetworkChangeNotifier::IPAddressObserver,
-      public NetworkChangeNotifier::ConnectionTypeObserver {
- public:
-  URLRequestThrottlerManager();
-  ~URLRequestThrottlerManager() override;
-
-  // Must be called for every request, returns the URL request throttler entry
-  // associated with the URL. The caller must inform this entry of some events.
-  // Please refer to url_request_throttler_entry_interface.h for further
-  // informations.
-  scoped_refptr<URLRequestThrottlerEntryInterface> RegisterRequestUrl(
-      const GURL& url);
-
-  // Adds the given host to a list of sites for which exponential back-off
-  // throttling will be disabled.  Subdomains are not included, so they
-  // must be added separately.
-  void AddToOptOutList(const std::string& host);
-
-  // Registers a new entry in this service and overrides the existing entry (if
-  // any) for the URL. The service will hold a reference to the entry.
-  // It is only used by unit tests.
-  void OverrideEntryForTests(const GURL& url, URLRequestThrottlerEntry* entry);
-
-  // Explicitly erases an entry.
-  // This is useful to remove those entries which have got infinite lifetime and
-  // thus won't be garbage collected.
-  // It is only used by unit tests.
-  void EraseEntryForTests(const GURL& url);
-
-  // Turns threading model verification on or off.  Any code that correctly
-  // uses the network stack should preferably call this function to enable
-  // verification of correct adherence to the network stack threading model.
-  void set_enable_thread_checks(bool enable);
-  bool enable_thread_checks() const;
-
-  // Whether throttling is enabled or not.
-  void set_enforce_throttling(bool enforce);
-  bool enforce_throttling();
-
-  // Sets the NetLog instance to use.
-  void set_net_log(NetLog* net_log);
-  NetLog* net_log() const;
-
-  // IPAddressObserver interface.
-  void OnIPAddressChanged() override;
-
-  // ConnectionTypeObserver interface.
-  void OnConnectionTypeChanged(
-      NetworkChangeNotifier::ConnectionType type) override;
-
-  // Method that allows us to transform a URL into an ID that can be used in our
-  // map. Resulting IDs will be lowercase and consist of the scheme, host, port
-  // and path (without query string, fragment, etc.).
-  // If the URL is invalid, the invalid spec will be returned, without any
-  // transformation.
-  std::string GetIdFromUrl(const GURL& url) const;
-
-  // Method that ensures the map gets cleaned from time to time. The period at
-  // which garbage collecting happens is adjustable with the
-  // kRequestBetweenCollecting constant.
-  void GarbageCollectEntriesIfNecessary();
-
-  // Method that does the actual work of garbage collecting.
-  void GarbageCollectEntries();
-
-  // When we switch from online to offline or change IP addresses, we
-  // clear all back-off history. This is a precaution in case the change in
-  // online state now lets us communicate without error with servers that
-  // we were previously getting 500 or 503 responses from (perhaps the
-  // responses are from a badly-written proxy that should have returned a
-  // 502 or 504 because it's upstream connection was down or it had no route
-  // to the server).
-  void OnNetworkChange();
-
-  // Used by tests.
-  int GetNumberOfEntriesForTests() const { return url_entries_.size(); }
-
- private:
-  // From each URL we generate an ID composed of the scheme, host, port and path
-  // that allows us to uniquely map an entry to it.
-  typedef std::map<std::string, scoped_refptr<URLRequestThrottlerEntry> >
-      UrlEntryMap;
-
-  // We maintain a set of hosts that have opted out of exponential
-  // back-off throttling.
-  typedef std::set<std::string> OptOutHosts;
-
-  // Maximum number of entries that we are willing to collect in our map.
-  static const unsigned int kMaximumNumberOfEntries;
-  // Number of requests that will be made between garbage collection.
-  static const unsigned int kRequestsBetweenCollecting;
-
-  // Map that contains a list of URL ID and their matching
-  // URLRequestThrottlerEntry.
-  UrlEntryMap url_entries_;
-
-  // Set of hosts that have opted out.
-  OptOutHosts opt_out_hosts_;
-
-  // This keeps track of how many requests have been made. Used with
-  // GarbageCollectEntries.
-  unsigned int requests_since_last_gc_;
-
-  // Valid after construction.
-  GURL::Replacements url_id_replacements_;
-
-  // Certain tests do not obey the net component's threading policy, so we
-  // keep track of whether we're being used by tests, and turn off certain
-  // checks.
-  //
-  // TODO(joi): See if we can fix the offending unit tests and remove this
-  // workaround.
-  bool enable_thread_checks_;
-
-  // Initially false, switches to true once we have logged because of back-off
-  // being disabled for localhost.
-  bool logged_for_localhost_disabled_;
-
-  // NetLog to use, if configured.
-  BoundNetLog net_log_;
-
-  // Valid once we've registered for network notifications.
-  base::PlatformThreadId registered_from_thread_;
-
-  DISALLOW_COPY_AND_ASSIGN(URLRequestThrottlerManager);
-};
-
-}  // namespace net
-
-#endif  // NET_URL_REQUEST_URL_REQUEST_THROTTLER_MANAGER_H_