1 // 2 // 3 // Copyright 2016 gRPC authors. 4 // 5 // Licensed under the Apache License, Version 2.0 (the "License"); 6 // you may not use this file except in compliance with the License. 7 // You may obtain a copy of the License at 8 // 9 // http://www.apache.org/licenses/LICENSE-2.0 10 // 11 // Unless required by applicable law or agreed to in writing, software 12 // distributed under the License is distributed on an "AS IS" BASIS, 13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 // See the License for the specific language governing permissions and 15 // limitations under the License. 16 // 17 // 18 19 #include <grpc/support/port_platform.h> 20 21 #include "src/core/lib/backoff/backoff.h" 22 23 #include <algorithm> 24 25 namespace grpc_core { 26 BackOff(const Options & options)27BackOff::BackOff(const Options& options) : options_(options) { Reset(); } 28 NextAttemptTime()29Timestamp BackOff::NextAttemptTime() { 30 if (initial_) { 31 initial_ = false; 32 return current_backoff_ + Timestamp::Now(); 33 } 34 current_backoff_ = std::min(current_backoff_ * options_.multiplier(), 35 options_.max_backoff()); 36 const Duration jitter = Duration::FromSecondsAsDouble( 37 absl::Uniform(rand_gen_, -options_.jitter() * current_backoff_.seconds(), 38 options_.jitter() * current_backoff_.seconds())); 39 return Timestamp::Now() + current_backoff_ + jitter; 40 } 41 Reset()42void BackOff::Reset() { 43 current_backoff_ = options_.initial_backoff(); 44 initial_ = true; 45 } 46 47 } // namespace grpc_core 48