chromium/components/sync/engine/backoff_delay_provider.cc

// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "components/sync/engine/backoff_delay_provider.h"

#include <algorithm>

#include "base/memory/ptr_util.h"
#include "base/rand_util.h"
#include "components/sync/engine/cycle/model_neutral_state.h"
#include "components/sync/engine/polling_constants.h"
#include "components/sync/engine/sync_protocol_error.h"
#include "components/sync/engine/syncer_error.h"

namespace syncer {

namespace {

// This calculates approx. last_delay * kBackoffMultiplyFactor +/- last_delay
// * kBackoffJitterFactor. |jitter_sign| must be -1 or 1 and determines whether
// the jitter in the delay will be positive or negative.
base::TimeDelta GetDelayImpl(base::TimeDelta last_delay, int jitter_sign) { … }

}  // namespace

// static
std::unique_ptr<BackoffDelayProvider> BackoffDelayProvider::FromDefaults() { … }

// static
std::unique_ptr<BackoffDelayProvider>
BackoffDelayProvider::WithShortInitialRetryOverride() { … }

BackoffDelayProvider::BackoffDelayProvider(
    const base::TimeDelta& default_initial_backoff,
    const base::TimeDelta& short_initial_backoff)
    : … { … }

BackoffDelayProvider::~BackoffDelayProvider() = default;

base::TimeDelta BackoffDelayProvider::GetDelay(
    const base::TimeDelta& last_delay) { … }

base::TimeDelta BackoffDelayProvider::GetInitialDelay(
    const ModelNeutralState& state) const { … }

base::TimeDelta BackoffDelayProvider::GetDelayForTesting(
    base::TimeDelta last_delay,
    int jitter_sign) { … }

}  // namespace syncer