LCOV - code coverage report
Current view: top level - include/hpactor/supervision - supervision.hpp (source / functions) Coverage Total Hit
Test: HPActor Coverage Lines: 100.0 % 2 2
Test Date: 2026-05-20 02:24:49 Functions: 50.0 % 2 1
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: - 0 0

             Branch data     Line data    Source code
       1                 :             : // Copyright 2026 HPActor Contributors
       2                 :             : //
       3                 :             : // Licensed under the Apache License, Version 2.0 (the "License");
       4                 :             : // you may not use this file except in compliance with the License.
       5                 :             : // You may obtain a copy of the License at
       6                 :             : //
       7                 :             : //     http://www.apache.org/licenses/LICENSE-2.0
       8                 :             : //
       9                 :             : // Unless required by applicable law or agreed to in writing, software
      10                 :             : // distributed under the License is distributed on an "AS IS" BASIS,
      11                 :             : // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      12                 :             : // See the License for the specific language governing permissions and
      13                 :             : // limitations under the License.
      14                 :             : 
      15                 :             : #pragma once
      16                 :             : #include <chrono>
      17                 :             : #include <hpactor/actor/event_based_actor.hpp>
      18                 :             : #include <hpactor/actor_context.hpp>
      19                 :             : #include <hpactor/mem/std_allocator.hpp>
      20                 :             : #include <hpactor/metrics/metrics_ring_buffer.hpp>
      21                 :             : #include <hpactor/ref/actor_address.hpp>
      22                 :             : #include <hpactor/ref/actor_ref.hpp>
      23                 :             : #include <hpactor/types/types.hpp>
      24                 :             : #include <unordered_map>
      25                 :             : #include <vector>
      26                 :             : 
      27                 :             : namespace hpactor {
      28                 :             : 
      29                 :             : // SupervisionDirective - directive from supervisor to child on failure
      30                 :             : enum class SupervisionDirective { Restart, Stop, Escalate };
      31                 :             : 
      32                 :             : // ChildFailure - information about a child actor failure
      33                 :             : struct ChildFailure {
      34                 :             :     ActorId child_id;
      35                 :             :     error reason;
      36                 :             :     SupervisionDirective directive;
      37                 :             : };
      38                 :             : 
      39                 :             : // SupervisionPolicy - configuration for supervision behavior
      40                 :             : struct SupervisionPolicy {
      41                 :             :     enum class Strategy { OneForOne, AllForOne, OneForAll };
      42                 :             :     Strategy strategy = Strategy::OneForOne;
      43                 :             :     uint32_t max_restarts = 10;
      44                 :           3 :     std::chrono::milliseconds restart_interval{5000};
      45                 :             : };
      46                 :             : 
      47                 :             : // Supervisor - interface for supervision strategy
      48                 :             : class Supervisor {
      49                 :             :   public:
      50                 :           6 :     virtual ~Supervisor() = default;
      51                 :             :     virtual SupervisionDirective on_child_failure(const ChildFailure& failure) = 0;
      52                 :             :     virtual void on_child_stopped(ActorId child_id);
      53                 :             : };
      54                 :             : 
      55                 :             : // SupervisorActor - EventBasedActor that implements supervision
      56                 :             : class SupervisorActor : public EventBasedActor {
      57                 :             :   public:
      58                 :             :     SupervisorActor(ActorContext* ctx, ActorSystem& sys, Supervisor& strategy,
      59                 :             :                     std::vector<Actor> children);
      60                 :             : 
      61                 :             :   protected:
      62                 :             :     Behavior make_behavior() override;
      63                 :             : 
      64                 :             :     // Override to add actual spawn logic for restarted children.
      65                 :             :     // The base implementation manages restart counts and the sliding window.
      66                 :             :     virtual void restart_child(ActorId child_id, const error& reason);
      67                 :             :     void restart_all_children();
      68                 :             : 
      69                 :             :     Supervisor& strategy_;
      70                 :             : 
      71                 :             :   public:
      72                 :             :     using ActorVec = std::vector<Actor, mem::MemStdAllocator<Actor>>;
      73                 :             :     using RestartCountMap =
      74                 :             :         std::unordered_map<ActorId, uint32_t, std::hash<ActorId>, std::equal_to<>,
      75                 :             :                            mem::MemStdAllocator<std::pair<const ActorId, uint32_t>>>;
      76                 :             : 
      77                 :             :   protected:
      78                 :             :     ActorVec children_;
      79                 :             :     RestartCountMap restart_counts_{
      80                 :             :         mem::MemStdAllocator<std::pair<const ActorId, uint32_t>>(
      81                 :             :             id_ptr(), mem::RegionType::kActor)};
      82                 :             :     std::chrono::steady_clock::time_point first_failure_time_;
      83                 :             : 
      84                 :             :   private:
      85                 :             :     void handle_child_down(TypeTag tag, const StreamBuffer& payload);
      86                 :             : };
      87                 :             : 
      88                 :             : // SelfSupervisingActor - EventBasedActor that manages its own children
      89                 :             : class SelfSupervisingActor : public EventBasedActor {
      90                 :             :   public:
      91                 :             :     // Container type aliases with MemStdAllocator
      92                 :             :     using ActorVec = std::vector<Actor, mem::MemStdAllocator<Actor>>;
      93                 :             :     using ActorRefVec = std::vector<ActorRef, mem::MemStdAllocator<ActorRef>>;
      94                 :             :     using ActorAddrVec =
      95                 :             :         std::vector<ActorAddress, mem::MemStdAllocator<ActorAddress>>;
      96                 :             :     using RestartCountMap =
      97                 :             :         std::unordered_map<ActorId, uint32_t, std::hash<ActorId>, std::equal_to<>,
      98                 :             :                            mem::MemStdAllocator<std::pair<const ActorId, uint32_t>>>;
      99                 :             : 
     100                 :             :     SelfSupervisingActor(ActorContext* ctx, ActorSystem& sys,
     101                 :             :                          SupervisionPolicy policy = SupervisionPolicy{});
     102                 :             : 
     103                 :             :     void add_child(Actor child);
     104                 :             :     void remove_child(Actor child);
     105                 :             : 
     106                 :             :     // Remote child management
     107                 :             :     void add_remote_child(ActorRef child);
     108                 :             :     bool has_remote_child(const ActorAddress& addr) const;
     109                 :             :     ActorRef get_remote_child(const ActorAddress& addr) const;
     110                 :             :     void remove_remote_child(const ActorAddress& addr);
     111                 :             :     const ActorRefVec& remote_children() const {
     112                 :             :         return remote_children_;
     113                 :             :     }
     114                 :             : 
     115                 :             :   protected:
     116                 :             :     virtual SupervisionDirective on_failure(ActorId child_id, const error& err);
     117                 :             :     void handle_child_down(TypeTag tag, const StreamBuffer& payload);
     118                 :             : 
     119                 :             :   private:
     120                 :             :     SupervisionDirective decide_restart(ActorId child_id, const error& err);
     121                 :             : 
     122                 :             :     ActorVec children_;
     123                 :             :     SupervisionPolicy policy_;
     124                 :             :     RestartCountMap restart_counts_{
     125                 :             :         mem::MemStdAllocator<std::pair<const ActorId, uint32_t>>(
     126                 :             :             id_ptr(), mem::RegionType::kActor)};
     127                 :             :     std::chrono::steady_clock::time_point first_failure_time_;
     128                 :             :     ActorRefVec remote_children_;
     129                 :             :     ActorAddrVec remote_child_addresses_;
     130                 :             : };
     131                 :             : 
     132                 :             : } // namespace hpactor
        

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