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//
//
// Copyright 2016 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//
#ifndef GRPC_SRC_CORE_LIB_BACKOFF_BACKOFF_H
#define GRPC_SRC_CORE_LIB_BACKOFF_BACKOFF_H
#include <grpc/support/port_platform.h>
#include "y_absl/random/random.h"
#include "src/core/lib/gprpp/time.h"
namespace grpc_core {
/// Implementation of the backoff mechanism described in
/// doc/connection-backoff.md
class BackOff {
public:
class Options;
/// Initialize backoff machinery - does not need to be destroyed
explicit BackOff(const Options& options);
/// Returns the time at which the next attempt should start.
Timestamp NextAttemptTime();
/// Reset the backoff, so the next value returned by NextAttemptTime()
/// will be the time of the second attempt (rather than the Nth).
void Reset();
class Options {
public:
Options& set_initial_backoff(Duration initial_backoff) {
initial_backoff_ = initial_backoff;
return *this;
}
Options& set_multiplier(double multiplier) {
multiplier_ = multiplier;
return *this;
}
Options& set_jitter(double jitter) {
jitter_ = jitter;
return *this;
}
Options& set_max_backoff(Duration max_backoff) {
max_backoff_ = max_backoff;
return *this;
}
/// how long to wait after the first failure before retrying
Duration initial_backoff() const { return initial_backoff_; }
/// factor with which to multiply backoff after a failed retry
double multiplier() const { return multiplier_; }
/// amount to randomize backoffs
double jitter() const { return jitter_; }
/// maximum time between retries
Duration max_backoff() const { return max_backoff_; }
private:
Duration initial_backoff_;
double multiplier_;
double jitter_;
Duration max_backoff_;
}; // class Options
private:
const Options options_;
y_absl::BitGen rand_gen_;
bool initial_;
/// current delay before retries
Duration current_backoff_;
};
} // namespace grpc_core
#endif // GRPC_SRC_CORE_LIB_BACKOFF_BACKOFF_H
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