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      1 /*
      2  *
      3  * Copyright 2017 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 #ifndef GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_LB_POLICY_GRPCLB_GRPCLB_CLIENT_STATS_H
     20 #define GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_LB_POLICY_GRPCLB_GRPCLB_CLIENT_STATS_H
     21 
     22 #include <grpc/support/port_platform.h>
     23 
     24 #include <grpc/support/atm.h>
     25 
     26 #include "src/core/lib/gprpp/inlined_vector.h"
     27 #include "src/core/lib/gprpp/memory.h"
     28 #include "src/core/lib/gprpp/ref_counted.h"
     29 
     30 namespace grpc_core {
     31 
     32 class GrpcLbClientStats : public RefCounted<GrpcLbClientStats> {
     33  public:
     34   struct DropTokenCount {
     35     UniquePtr<char> token;
     36     int64_t count;
     37 
     38     DropTokenCount(UniquePtr<char> token, int64_t count)
     39         : token(std::move(token)), count(count) {}
     40   };
     41 
     42   typedef InlinedVector<DropTokenCount, 10> DroppedCallCounts;
     43 
     44   GrpcLbClientStats() {}
     45 
     46   void AddCallStarted();
     47   void AddCallFinished(bool finished_with_client_failed_to_send,
     48                        bool finished_known_received);
     49 
     50   // This method is not thread-safe; caller must synchronize.
     51   void AddCallDroppedLocked(char* token);
     52 
     53   // This method is not thread-safe; caller must synchronize.
     54   void GetLocked(int64_t* num_calls_started, int64_t* num_calls_finished,
     55                  int64_t* num_calls_finished_with_client_failed_to_send,
     56                  int64_t* num_calls_finished_known_received,
     57                  UniquePtr<DroppedCallCounts>* drop_token_counts);
     58 
     59  private:
     60   // This field must only be accessed via *_locked() methods.
     61   UniquePtr<DroppedCallCounts> drop_token_counts_;
     62   // These fields may be accessed from multiple threads at a time.
     63   gpr_atm num_calls_started_ = 0;
     64   gpr_atm num_calls_finished_ = 0;
     65   gpr_atm num_calls_finished_with_client_failed_to_send_ = 0;
     66   gpr_atm num_calls_finished_known_received_ = 0;
     67 };
     68 
     69 }  // namespace grpc_core
     70 
     71 #endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_LB_POLICY_GRPCLB_GRPCLB_CLIENT_STATS_H \
     72         */
     73