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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_SYNC_TEST_INTEGRATION_EXPONENTIAL_BACKOFF_HELPER_H_
#define CHROME_BROWSER_SYNC_TEST_INTEGRATION_EXPONENTIAL_BACKOFF_HELPER_H_
#include <vector>
#include "base/time/time.h"
#include "chrome/browser/sync/test/integration/single_client_status_change_checker.h"
namespace exponential_backoff_helper {
// Helper class that checks if a sync client has successfully gone through
// exponential backoff after it encounters an error.
class ExponentialBackoffChecker : public SingleClientStatusChangeChecker {
public:
// Upon construction, it is expected that backoff hasn't started yet.
explicit ExponentialBackoffChecker(syncer::SyncServiceImpl* sync_service,
base::TimeDelta initial_delay);
~ExponentialBackoffChecker() override;
ExponentialBackoffChecker(const ExponentialBackoffChecker&) = delete;
ExponentialBackoffChecker& operator=(const ExponentialBackoffChecker&) =
delete;
// SingleClientStatusChangeChecker overrides.
void OnSyncCycleCompleted(syncer::SyncService* sync_service) override;
bool IsExitConditionSatisfied(std::ostream* os) override;
private:
// The minimum and maximum wait times for a retry. The actual retry would take
// place somewhere in this range. The algorithm that calculates the retry wait
// time uses rand functions.
struct DelayRange {
base::TimeDelta min_delay;
base::TimeDelta max_delay;
};
// Helper functions to build the delay table.
static DelayRange CalculateDelayRange(base::TimeDelta current_delay);
static std::vector<DelayRange> BuildExpectedDelayTable(
base::TimeDelta initial_delay);
const std::vector<DelayRange> expected_delay_table_;
std::vector<base::TimeDelta> actual_delays_;
base::Time last_sync_time_;
};
} // namespace exponential_backoff_helper
#endif // CHROME_BROWSER_SYNC_TEST_INTEGRATION_EXPONENTIAL_BACKOFF_HELPER_H_
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