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include/comm/packet/client_pool.hpp

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+/*
+  Copyright <2018-2022> <scott.e.graves@protonmail.com>
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
+  associated documentation files (the "Software"), to deal in the Software without restriction,
+  including without limitation the rights to use, copy, modify, merge, publish, distribute,
+  sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all copies or
+  substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
+  NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+  DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
+  OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+#ifndef INCLUDE_COMM_PACKET_CLIENT_POOL_HPP_
+#define INCLUDE_COMM_PACKET_CLIENT_POOL_HPP_
+
+#include "common.hpp"
+#include "comm/packet/packet.hpp"
+#include "types/repertory.hpp"
+
+namespace repertory {
+class client_pool final {
+public:
+  typedef std::function<packet::error_type()> worker_callback;
+  typedef std::function<void(const packet::error_type &result)> worker_complete_callback;
+
+private:
+  class pool final {
+  private:
+    struct work_item final {
+      work_item(const worker_callback &worker, const worker_complete_callback &worker_complete)
+          : work(worker), work_complete(worker_complete) {}
+
+      worker_callback work;
+      worker_complete_callback work_complete;
+    };
+
+    struct work_queue final {
+      std::mutex mutex;
+      std::condition_variable notify;
+      std::deque<std::shared_ptr<work_item>> queue;
+    };
+
+  public:
+    explicit pool(const std::uint8_t &pool_size);
+
+    ~pool() { shutdown(); }
+
+  private:
+    std::vector<std::unique_ptr<work_queue>> pool_queues_;
+    std::vector<std::thread> pool_threads_;
+    bool shutdown_ = false;
+    std::atomic<std::uint8_t> thread_index_;
+
+  public:
+    void execute(const std::uint64_t &thread_id, const worker_callback &worker,
+                 const worker_complete_callback &worker_complete);
+
+    void shutdown();
+  };
+
+public:
+  explicit client_pool(const std::uint8_t &pool_size = 10u)
+      : pool_size_(pool_size ? pool_size : 10u) {}
+
+  ~client_pool() { shutdown(); }
+
+private:
+  const std::uint8_t pool_size_;
+  std::unordered_map<std::string, std::shared_ptr<pool>> pool_lookup_;
+  std::mutex pool_mutex_;
+  bool shutdown_ = false;
+
+public:
+  void execute(const std::string &client_id, const std::uint64_t &thread_id,
+               const worker_callback &worker, const worker_complete_callback &worker_complete);
+
+  void remove_client(const std::string &client_id);
+
+  void shutdown();
+};
+} // namespace repertory
+
+#endif // INCLUDE_COMM_PACKET_CLIENT_POOL_HPP_