Start implementing network connectivity.

Change-Id: I82875bfd1c3a086033d22de636d4fb43455ebac3

src/NetworkConnection.h

@@ -0,0 +1,59 @@
+/*----------------------------------------------------------------------------*/
+/* 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 <memory>
+#include <thread>
+
+#include "support/ConcurrentQueue.h"
+#include "Message.h"
+
+class TCPStream;
+
+namespace ntimpl {
+
+class NetworkConnection {
+ public:
+  typedef ConcurrentQueue<std::shared_ptr<Message>> Queue;
+  typedef ConcurrentQueue<std::vector<std::shared_ptr<Message>>> BatchQueue;
+
+  NetworkConnection(std::unique_ptr<TCPStream> stream, BatchQueue& outgoing,
+                    Queue& incoming, Message::GetEntryTypeFunc get_entry_type);
+  ~NetworkConnection();
+
+  void Start();
+  void Stop();
+
+  bool active() const { return m_active; }
+  TCPStream& stream() { return *m_stream; }
+  void set_proto_rev(unsigned int proto_rev) { m_proto_rev = proto_rev; }
+
+  NetworkConnection(const NetworkConnection&) = delete;
+  NetworkConnection& operator=(const NetworkConnection&) = delete;
+  NetworkConnection(NetworkConnection&&) = default;
+  NetworkConnection& operator=(NetworkConnection&&) = default;
+
+ private:
+  void ReadThreadMain();
+  void WriteThreadMain();
+
+  std::unique_ptr<TCPStream> m_stream;
+  BatchQueue& m_outgoing;
+  Queue& m_incoming;
+  Message::GetEntryTypeFunc m_get_entry_type;
+  std::thread m_read_thread;
+  std::thread m_write_thread;
+  std::atomic_bool m_active;
+  std::atomic_uint m_proto_rev;
+};
+
+}  // namespace ntimpl
+
+#endif  // NT_NETWORKCONNECTION_H_