| /* |
| * |
| * 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_CORE_LIB_TRANSPORT_BDP_ESTIMATOR_H |
| #define GRPC_CORE_LIB_TRANSPORT_BDP_ESTIMATOR_H |
| |
| #include <grpc/support/port_platform.h> |
| |
| #include <inttypes.h> |
| #include <stdbool.h> |
| #include <stdint.h> |
| |
| #include <grpc/support/log.h> |
| #include <grpc/support/time.h> |
| |
| #include "src/core/lib/debug/trace.h" |
| #include "src/core/lib/iomgr/exec_ctx.h" |
| |
| extern grpc_core::TraceFlag grpc_bdp_estimator_trace; |
| |
| namespace grpc_core { |
| |
| class BdpEstimator { |
| public: |
| explicit BdpEstimator(const char* name); |
| ~BdpEstimator() {} |
| |
| int64_t EstimateBdp() const { return estimate_; } |
| double EstimateBandwidth() const { return bw_est_; } |
| |
| void AddIncomingBytes(int64_t num_bytes) { accumulator_ += num_bytes; } |
| |
| // Schedule a ping: call in response to receiving a true from |
| // grpc_bdp_estimator_add_incoming_bytes once a ping has been scheduled by a |
| // transport (but not necessarily started) |
| void SchedulePing() { |
| if (grpc_bdp_estimator_trace.enabled()) { |
| gpr_log(GPR_DEBUG, "bdp[%s]:sched acc=%" PRId64 " est=%" PRId64, name_, |
| accumulator_, estimate_); |
| } |
| GPR_ASSERT(ping_state_ == PingState::UNSCHEDULED); |
| ping_state_ = PingState::SCHEDULED; |
| accumulator_ = 0; |
| } |
| |
| // Start a ping: call after calling grpc_bdp_estimator_schedule_ping and |
| // once |
| // the ping is on the wire |
| void StartPing() { |
| if (grpc_bdp_estimator_trace.enabled()) { |
| gpr_log(GPR_DEBUG, "bdp[%s]:start acc=%" PRId64 " est=%" PRId64, name_, |
| accumulator_, estimate_); |
| } |
| GPR_ASSERT(ping_state_ == PingState::SCHEDULED); |
| ping_state_ = PingState::STARTED; |
| accumulator_ = 0; |
| ping_start_time_ = gpr_now(GPR_CLOCK_MONOTONIC); |
| } |
| |
| // Completes a previously started ping, returns when to schedule the next one |
| grpc_millis CompletePing(grpc_exec_ctx* exec_ctx); |
| |
| private: |
| enum class PingState { UNSCHEDULED, SCHEDULED, STARTED }; |
| |
| PingState ping_state_; |
| int64_t accumulator_; |
| int64_t estimate_; |
| // when was the current ping started? |
| gpr_timespec ping_start_time_; |
| int inter_ping_delay_; |
| int stable_estimate_count_; |
| double bw_est_; |
| const char* name_; |
| }; |
| |
| } // namespace grpc_core |
| |
| #endif /* GRPC_CORE_LIB_TRANSPORT_BDP_ESTIMATOR_H */ |