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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_SYNC_ENGINE_CYCLE_COMMIT_QUOTA_H_
#define COMPONENTS_SYNC_ENGINE_CYCLE_COMMIT_QUOTA_H_
#include "base/time/time.h"
namespace syncer {
// Tracks quota for commits with `max_tokens` being also the initial token
// count. A token is refilled every `refill_interval` if below the maximum token
// count. Tokens are consumed one by one by `ConsumeToken()` until they reach
// the zero. When having zero tokens, calls to `ConsumeToken()` only reset the
// refill "timer" (pushing away the next refill to happen after
// `refill_interval` from now).
class CommitQuota {
public:
CommitQuota(int max_tokens, base::TimeDelta refill_interval);
CommitQuota(const CommitQuota&);
CommitQuota& operator=(const CommitQuota&);
CommitQuota(CommitQuota&&);
CommitQuota& operator=(CommitQuota&&);
~CommitQuota();
// Changes the current quota params to the values provided as arguments.
void SetParams(int max_tokens, base::TimeDelta refill_interval);
// Returns whether the current token count is greater than zero.
bool HasTokensAvailable();
// Consumes a token. If the current token count is zero, it only resets the
// refill "timer".
void ConsumeToken();
private:
// Refills any tokens and updates `last_refilled_` time if possible.
void RefillTokens();
// Params of the quota.
int max_tokens_;
base::TimeDelta refill_interval_;
// Current state of the quota.
int tokens_;
base::TimeTicks last_refilled_;
};
} // namespace syncer
#endif // COMPONENTS_SYNC_ENGINE_CYCLE_COMMIT_QUOTA_H_
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