Remove wpiutil and update to the new build system (#210)

src/main/native/cpp/NetworkConnection.h

@@ -0,0 +1,119 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 2015. All Rights Reserved.                             */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#ifndef NT_NETWORKCONNECTION_H_
+#define NT_NETWORKCONNECTION_H_
+
+#include <atomic>
+#include <chrono>
+#include <memory>
+#include <thread>
+
+#include "support/ConcurrentQueue.h"
+#include "Message.h"
+#include "ntcore_cpp.h"
+
+namespace wpi {
+class NetworkStream;
+}
+
+namespace nt {
+
+class Notifier;
+
+class NetworkConnection {
+ public:
+  enum State { kCreated, kInit, kHandshake, kSynchronized, kActive, kDead };
+
+  typedef std::function<bool(
+      NetworkConnection& conn,
+      std::function<std::shared_ptr<Message>()> get_msg,
+      std::function<void(llvm::ArrayRef<std::shared_ptr<Message>>)> send_msgs)>
+      HandshakeFunc;
+  typedef std::function<void(std::shared_ptr<Message> msg,
+                             NetworkConnection* conn)>
+      ProcessIncomingFunc;
+  typedef std::vector<std::shared_ptr<Message>> Outgoing;
+  typedef wpi::ConcurrentQueue<Outgoing> OutgoingQueue;
+
+  NetworkConnection(std::unique_ptr<wpi::NetworkStream> stream,
+                    Notifier& notifier, HandshakeFunc handshake,
+                    Message::GetEntryTypeFunc get_entry_type);
+  ~NetworkConnection();
+
+  // Set the input processor function.  This must be called before Start().
+  void set_process_incoming(ProcessIncomingFunc func) {
+    m_process_incoming = func;
+  }
+
+  void Start();
+  void Stop();
+
+  ConnectionInfo info() const;
+
+  bool active() const { return m_active; }
+  wpi::NetworkStream& stream() { return *m_stream; }
+
+  void QueueOutgoing(std::shared_ptr<Message> msg);
+  void PostOutgoing(bool keep_alive);
+  void NotifyIfActive(ConnectionListenerCallback callback) const;
+
+  unsigned int uid() const { return m_uid; }
+
+  unsigned int proto_rev() const { return m_proto_rev; }
+  void set_proto_rev(unsigned int proto_rev) { m_proto_rev = proto_rev; }
+
+  State state() const;
+  void set_state(State state);
+
+  std::string remote_id() const;
+  void set_remote_id(StringRef remote_id);
+
+  unsigned long long last_update() const { return m_last_update; }
+
+  NetworkConnection(const NetworkConnection&) = delete;
+  NetworkConnection& operator=(const NetworkConnection&) = delete;
+
+ private:
+  void ReadThreadMain();
+  void WriteThreadMain();
+
+  static std::atomic_uint s_uid;
+
+  unsigned int m_uid;
+  std::unique_ptr<wpi::NetworkStream> m_stream;
+  Notifier& m_notifier;
+  OutgoingQueue m_outgoing;
+  HandshakeFunc m_handshake;
+  Message::GetEntryTypeFunc m_get_entry_type;
+  ProcessIncomingFunc m_process_incoming;
+  std::thread m_read_thread;
+  std::thread m_write_thread;
+  std::atomic_bool m_active;
+  std::atomic_uint m_proto_rev;
+  mutable std::mutex m_state_mutex;
+  State m_state;
+  mutable std::mutex m_remote_id_mutex;
+  std::string m_remote_id;
+  std::atomic_ullong m_last_update;
+  std::chrono::steady_clock::time_point m_last_post;
+
+  std::mutex m_pending_mutex;
+  Outgoing m_pending_outgoing;
+  std::vector<std::pair<std::size_t, std::size_t>> m_pending_update;
+
+  // Condition variables for shutdown
+  std::mutex m_shutdown_mutex;
+  std::condition_variable m_read_shutdown_cv;
+  std::condition_variable m_write_shutdown_cv;
+  bool m_read_shutdown = false;
+  bool m_write_shutdown = false;
+};
+
+}  // namespace nt
+
+#endif  // NT_NETWORKCONNECTION_H_