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Unified Diff: net/url_request/url_request_throttler_entry.h

Issue 992733002: Remove //net (except for Android test stuff) and sdch (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 5 years, 9 months ago
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Index: net/url_request/url_request_throttler_entry.h
diff --git a/net/url_request/url_request_throttler_entry.h b/net/url_request/url_request_throttler_entry.h
deleted file mode 100644
index 281d0f546072bafbedc0235bd50c85749242fecb..0000000000000000000000000000000000000000
--- a/net/url_request/url_request_throttler_entry.h
+++ /dev/null
@@ -1,177 +0,0 @@
-// 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_ENTRY_H_
-#define NET_URL_REQUEST_URL_REQUEST_THROTTLER_ENTRY_H_
-
-#include <queue>
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/time/time.h"
-#include "net/base/backoff_entry.h"
-#include "net/base/net_log.h"
-#include "net/url_request/url_request_throttler_entry_interface.h"
-
-namespace net {
-
-class NetworkDelegate;
-class URLRequestThrottlerManager;
-
-// URLRequestThrottlerEntry represents an entry of URLRequestThrottlerManager.
-// It analyzes requests of a specific URL over some period of time, in order to
-// deduce the back-off time for every request.
-// The back-off algorithm consists of two parts. Firstly, exponential back-off
-// is used when receiving 5XX server errors or malformed response bodies.
-// The exponential back-off rule is enforced by URLRequestHttpJob. Any
-// request sent during the back-off period will be cancelled.
-// Secondly, a sliding window is used to count recent requests to a given
-// destination and provide guidance (to the application level only) on whether
-// too many requests have been sent and when a good time to send the next one
-// would be. This is never used to deny requests at the network level.
-class NET_EXPORT URLRequestThrottlerEntry
- : public URLRequestThrottlerEntryInterface {
- public:
- // Sliding window period.
- static const int kDefaultSlidingWindowPeriodMs;
-
- // Maximum number of requests allowed in sliding window period.
- static const int kDefaultMaxSendThreshold;
-
- // Number of initial errors to ignore before starting exponential back-off.
- static const int kDefaultNumErrorsToIgnore;
-
- // Initial delay for exponential back-off.
- static const int kDefaultInitialDelayMs;
-
- // Factor by which the waiting time will be multiplied.
- static const double kDefaultMultiplyFactor;
-
- // Fuzzing percentage. ex: 10% will spread requests randomly
- // between 90%-100% of the calculated time.
- static const double kDefaultJitterFactor;
-
- // Maximum amount of time we are willing to delay our request.
- static const int kDefaultMaximumBackoffMs;
-
- // Time after which the entry is considered outdated.
- static const int kDefaultEntryLifetimeMs;
-
- // Name of the header that sites can use to opt out of exponential back-off
- // throttling.
- static const char kExponentialThrottlingHeader[];
-
- // Value for exponential throttling header that can be used to opt out of
- // exponential back-off throttling.
- static const char kExponentialThrottlingDisableValue[];
-
- // The manager object's lifetime must enclose the lifetime of this object.
- URLRequestThrottlerEntry(URLRequestThrottlerManager* manager,
- const std::string& url_id);
-
- // The life span of instances created with this constructor is set to
- // infinite, and the number of initial errors to ignore is set to 0.
- // It is only used by unit tests.
- URLRequestThrottlerEntry(URLRequestThrottlerManager* manager,
- const std::string& url_id,
- int sliding_window_period_ms,
- int max_send_threshold,
- int initial_backoff_ms,
- double multiply_factor,
- double jitter_factor,
- int maximum_backoff_ms);
-
- // Used by the manager, returns true if the entry needs to be garbage
- // collected.
- bool IsEntryOutdated() const;
-
- // Causes this entry to never reject requests due to back-off.
- void DisableBackoffThrottling();
-
- // Causes this entry to NULL its manager pointer.
- void DetachManager();
-
- // Implementation of URLRequestThrottlerEntryInterface.
- bool ShouldRejectRequest(const URLRequest& request,
- NetworkDelegate* network_delegate) const override;
- int64 ReserveSendingTimeForNextRequest(
- const base::TimeTicks& earliest_time) override;
- base::TimeTicks GetExponentialBackoffReleaseTime() const override;
- void UpdateWithResponse(
- const std::string& host,
- const URLRequestThrottlerHeaderInterface* response) override;
- void ReceivedContentWasMalformed(int response_code) override;
-
- protected:
- ~URLRequestThrottlerEntry() override;
-
- void Initialize();
-
- // Returns true if the given response code is considered an error for
- // throttling purposes.
- bool IsConsideredError(int response_code);
-
- // Equivalent to TimeTicks::Now(), virtual to be mockable for testing purpose.
- virtual base::TimeTicks ImplGetTimeNow() const;
-
- // Used internally to handle the opt-out header.
- void HandleThrottlingHeader(const std::string& header_value,
- const std::string& host);
-
- // Retrieves the back-off entry object we're using. Used to enable a
- // unit testing seam for dependency injection in tests.
- virtual const BackoffEntry* GetBackoffEntry() const;
- virtual BackoffEntry* GetBackoffEntry();
-
- // Returns true if |load_flags| contains a flag that indicates an
- // explicit request by the user to load the resource. We never
- // throttle requests with such load flags.
- static bool ExplicitUserRequest(const int load_flags);
-
- // Used by tests.
- base::TimeTicks sliding_window_release_time() const {
- return sliding_window_release_time_;
- }
-
- // Used by tests.
- void set_sliding_window_release_time(const base::TimeTicks& release_time) {
- sliding_window_release_time_ = release_time;
- }
-
- // Valid and immutable after construction time.
- BackoffEntry::Policy backoff_policy_;
-
- private:
- // Timestamp calculated by the sliding window algorithm for when we advise
- // clients the next request should be made, at the earliest. Advisory only,
- // not used to deny requests.
- base::TimeTicks sliding_window_release_time_;
-
- // A list of the recent send events. We use them to decide whether there are
- // too many requests sent in sliding window.
- std::queue<base::TimeTicks> send_log_;
-
- const base::TimeDelta sliding_window_period_;
- const int max_send_threshold_;
-
- // True if DisableBackoffThrottling() has been called on this object.
- bool is_backoff_disabled_;
-
- // Access it through GetBackoffEntry() to allow a unit test seam.
- BackoffEntry backoff_entry_;
-
- // Weak back-reference to the manager object managing us.
- URLRequestThrottlerManager* manager_;
-
- // Canonicalized URL string that this entry is for; used for logging only.
- std::string url_id_;
-
- BoundNetLog net_log_;
-
- DISALLOW_COPY_AND_ASSIGN(URLRequestThrottlerEntry);
-};
-
-} // namespace net
-
-#endif // NET_URL_REQUEST_URL_REQUEST_THROTTLER_ENTRY_H_
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