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Unified Diff: net/base/backoff_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/base/backoff_entry.h
diff --git a/net/base/backoff_entry.h b/net/base/backoff_entry.h
deleted file mode 100644
index d8f03d3476b7add5f83a17f66e7f34f15f7ec198..0000000000000000000000000000000000000000
--- a/net/base/backoff_entry.h
+++ /dev/null
@@ -1,115 +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_BASE_BACKOFF_ENTRY_H_
-#define NET_BASE_BACKOFF_ENTRY_H_
-
-#include "base/threading/non_thread_safe.h"
-#include "base/time/time.h"
-#include "net/base/net_export.h"
-
-namespace net {
-
-// Provides the core logic needed for randomized exponential back-off
-// on requests to a given resource, given a back-off policy.
-//
-// This utility class knows nothing about network specifics; it is
-// intended for reuse in various networking scenarios.
-class NET_EXPORT BackoffEntry : NON_EXPORTED_BASE(public base::NonThreadSafe) {
- public:
- // The set of parameters that define a back-off policy.
- struct Policy {
- // Number of initial errors (in sequence) to ignore before applying
- // exponential back-off rules.
- int num_errors_to_ignore;
-
- // Initial delay. The interpretation of this value depends on
- // always_use_initial_delay. It's either how long we wait between
- // requests before backoff starts, or how much we delay the first request
- // after backoff starts.
- int initial_delay_ms;
-
- // Factor by which the waiting time will be multiplied.
- double multiply_factor;
-
- // Fuzzing percentage. ex: 10% will spread requests randomly
- // between 90%-100% of the calculated time.
- double jitter_factor;
-
- // Maximum amount of time we are willing to delay our request, -1
- // for no maximum.
- int64 maximum_backoff_ms;
-
- // Time to keep an entry from being discarded even when it
- // has no significant state, -1 to never discard.
- int64 entry_lifetime_ms;
-
- // If true, we always use a delay of initial_delay_ms, even before
- // we've seen num_errors_to_ignore errors. Otherwise, initial_delay_ms
- // is the first delay once we start exponential backoff.
- //
- // So if we're ignoring 1 error, we'll see (N, N, Nm, Nm^2, ...) if true,
- // and (0, 0, N, Nm, ...) when false, where N is initial_backoff_ms and
- // m is multiply_factor, assuming we've already seen one success.
- bool always_use_initial_delay;
- };
-
- // Lifetime of policy must enclose lifetime of BackoffEntry. The
- // pointer must be valid but is not dereferenced during construction.
- explicit BackoffEntry(const Policy* const policy);
- virtual ~BackoffEntry();
-
- // Inform this item that a request for the network resource it is
- // tracking was made, and whether it failed or succeeded.
- void InformOfRequest(bool succeeded);
-
- // Returns true if a request for the resource this item tracks should
- // be rejected at the present time due to exponential back-off policy.
- bool ShouldRejectRequest() const;
-
- // Returns the absolute time after which this entry (given its present
- // state) will no longer reject requests.
- base::TimeTicks GetReleaseTime() const;
-
- // Returns the time until a request can be sent.
- base::TimeDelta GetTimeUntilRelease() const;
-
- // Causes this object reject requests until the specified absolute time.
- // This can be used to e.g. implement support for a Retry-After header.
- void SetCustomReleaseTime(const base::TimeTicks& release_time);
-
- // Returns true if this object has no significant state (i.e. you could
- // just as well start with a fresh BackoffEntry object), and hasn't
- // had for Policy::entry_lifetime_ms.
- bool CanDiscard() const;
-
- // Resets this entry to a fresh (as if just constructed) state.
- void Reset();
-
- // Returns the failure count for this entry.
- int failure_count() const { return failure_count_; }
-
- protected:
- // Equivalent to TimeTicks::Now(), virtual so unit tests can override.
- virtual base::TimeTicks ImplGetTimeNow() const;
-
- private:
- // Calculates when requests should again be allowed through.
- base::TimeTicks CalculateReleaseTime() const;
-
- // Timestamp calculated by the exponential back-off algorithm at which we are
- // allowed to start sending requests again.
- base::TimeTicks exponential_backoff_release_time_;
-
- // Counts request errors; decremented on success.
- int failure_count_;
-
- const Policy* const policy_;
-
- DISALLOW_COPY_AND_ASSIGN(BackoffEntry);
-};
-
-} // namespace net
-
-#endif // NET_BASE_BACKOFF_ENTRY_H_
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