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       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                 :             : 
      17                 :             : #include <hpactor/config/actor_factory.hpp>
      18                 :             : 
      19                 :             : #include <memory>
      20                 :             : #include <string>
      21                 :             : #include <unordered_map>
      22                 :             : #include <vector>
      23                 :             : 
      24                 :             : namespace hpactor::config {
      25                 :             : 
      26                 :             : // -----------------------------------------------------------------------------
      27                 :             : // ActorFactoryRegistry — singleton registry mapping behavior name strings to
      28                 :             : // ActorFactory functions.
      29                 :             : //
      30                 :             : // Populated at static init time via HPACTOR_REGISTER_ACTOR. Read-only after
      31                 :             : // main() starts (no runtime registration). Thread-safe by immutability.
      32                 :             : // -----------------------------------------------------------------------------
      33                 :             : class ActorFactoryRegistry {
      34                 :             :   public:
      35                 :             :     static ActorFactoryRegistry& instance();
      36                 :             : 
      37                 :             :     template <typename T>
      38                 :             :     void register_factory(const std::string& name);
      39                 :             : 
      40                 :             :     ActorFactory get_factory(const std::string& name) const;
      41                 :             :     bool has(const std::string& name) const;
      42                 :             :     std::vector<std::string> known_names() const;
      43                 :             : 
      44                 :             :   private:
      45                 :             :     std::unordered_map<std::string, ActorFactory> factories_;
      46                 :             : };
      47                 :             : 
      48                 :             : // Template implementation
      49                 :             : template <typename T>
      50                 :           5 : void ActorFactoryRegistry::register_factory(const std::string& name) {
      51                 :           5 :     factories_.emplace(name, [](ActorContext* ctx, ActorSystem& sys) {
      52                 :           9 :         return std::make_shared<T>(ctx, sys);
      53                 :             :     });
      54                 :           5 : }
      55                 :             : 
      56                 :             : } // namespace hpactor::config
      57                 :             : 
      58                 :             : // -----------------------------------------------------------------------------
      59                 :             : // HPACTOR_REGISTER_ACTOR — static registration macro
      60                 :             : //
      61                 :             : // Place in an actor's .cpp file to register it for TOML-based bootstrapping.
      62                 :             : // Registration happens before main() via static initialization.
      63                 :             : //
      64                 :             : // Example:
      65                 :             : //   HPACTOR_REGISTER_ACTOR("TcpGatewayActor", TcpGatewayActor);
      66                 :             : // -----------------------------------------------------------------------------
      67                 :             : #define HPACTOR_REGISTER_ACTOR(Name, ActorClass)                               \
      68                 :             :     namespace {                                                                  \
      69                 :             :         [[maybe_unused]] static const bool _hpactor_reg_##ActorClass = [] {      \
      70                 :             :             ::hpactor::config::ActorFactoryRegistry::instance()                  \
      71                 :             :                 .register_factory<ActorClass>(Name);                            \
      72                 :             :             return true;                                                         \
      73                 :             :         }();                                                                     \
      74                 :             :     }