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

src/main/native/cpp/Dispatcher.h

@@ -0,0 +1,145 @@
+/*----------------------------------------------------------------------------*/
+/* 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_DISPATCHER_H_
+#define NT_DISPATCHER_H_
+
+#include <atomic>
+#include <chrono>
+#include <condition_variable>
+#include <functional>
+#include <memory>
+#include <mutex>
+#include <string>
+#include <vector>
+
+#include "llvm/StringRef.h"
+
+#include "support/atomic_static.h"
+#include "NetworkConnection.h"
+#include "Notifier.h"
+#include "Storage.h"
+
+namespace wpi {
+class NetworkAcceptor;
+class NetworkStream;
+}
+
+namespace nt {
+
+class DispatcherBase {
+  friend class DispatcherTest;
+
+ public:
+  typedef std::function<std::unique_ptr<wpi::NetworkStream>()> Connector;
+
+  virtual ~DispatcherBase();
+
+  unsigned int GetNetworkMode() const;
+  void StartServer(llvm::StringRef persist_filename,
+                   std::unique_ptr<wpi::NetworkAcceptor> acceptor);
+  void StartClient();
+  void Stop();
+  void SetUpdateRate(double interval);
+  void SetIdentity(llvm::StringRef name);
+  void Flush();
+  std::vector<ConnectionInfo> GetConnections() const;
+  void NotifyConnections(ConnectionListenerCallback callback) const;
+
+  void SetConnector(Connector connector);
+  void SetConnector(std::vector<Connector>&& connectors);
+
+  void SetConnectorOverride(Connector connector);
+  void ClearConnectorOverride();
+
+  bool active() const { return m_active; }
+
+  DispatcherBase(const DispatcherBase&) = delete;
+  DispatcherBase& operator=(const DispatcherBase&) = delete;
+
+ protected:
+  DispatcherBase(Storage& storage, Notifier& notifier);
+
+ private:
+  void DispatchThreadMain();
+  void ServerThreadMain();
+  void ClientThreadMain();
+
+  bool ClientHandshake(
+      NetworkConnection& conn,
+      std::function<std::shared_ptr<Message>()> get_msg,
+      std::function<void(llvm::ArrayRef<std::shared_ptr<Message>>)> send_msgs);
+  bool ServerHandshake(
+      NetworkConnection& conn,
+      std::function<std::shared_ptr<Message>()> get_msg,
+      std::function<void(llvm::ArrayRef<std::shared_ptr<Message>>)> send_msgs);
+
+  void ClientReconnect(unsigned int proto_rev = 0x0300);
+
+  void QueueOutgoing(std::shared_ptr<Message> msg, NetworkConnection* only,
+                     NetworkConnection* except);
+
+  Storage& m_storage;
+  Notifier& m_notifier;
+  unsigned int m_networkMode = NT_NET_MODE_NONE;
+  std::string m_persist_filename;
+  std::thread m_dispatch_thread;
+  std::thread m_clientserver_thread;
+
+  std::unique_ptr<wpi::NetworkAcceptor> m_server_acceptor;
+  Connector m_client_connector_override;
+  std::vector<Connector> m_client_connectors;
+
+  // Mutex for user-accessible items
+  mutable std::mutex m_user_mutex;
+  std::vector<std::shared_ptr<NetworkConnection>> m_connections;
+  std::string m_identity;
+
+  std::atomic_bool m_active;       // set to false to terminate threads
+  std::atomic_uint m_update_rate;  // periodic dispatch update rate, in ms
+
+  // Condition variable for forced dispatch wakeup (flush)
+  std::mutex m_flush_mutex;
+  std::condition_variable m_flush_cv;
+  std::chrono::steady_clock::time_point m_last_flush;
+  bool m_do_flush = false;
+
+  // Condition variable for client reconnect (uses user mutex)
+  std::condition_variable m_reconnect_cv;
+  unsigned int m_reconnect_proto_rev = 0x0300;
+  bool m_do_reconnect = true;
+};
+
+class Dispatcher : public DispatcherBase {
+  friend class DispatcherTest;
+
+ public:
+  static Dispatcher& GetInstance() {
+    ATOMIC_STATIC(Dispatcher, instance);
+    return instance;
+  }
+
+  void StartServer(StringRef persist_filename, const char* listen_address,
+                   unsigned int port);
+
+  void SetServer(const char* server_name, unsigned int port);
+  void SetServer(ArrayRef<std::pair<StringRef, unsigned int>> servers);
+
+  void SetServerOverride(const char* server_name, unsigned int port);
+  void ClearServerOverride();
+
+ private:
+  Dispatcher();
+  Dispatcher(Storage& storage, Notifier& notifier)
+      : DispatcherBase(storage, notifier) {}
+
+  ATOMIC_STATIC_DECL(Dispatcher)
+};
+
+}  // namespace nt
+
+#endif  // NT_DISPATCHER_H_