Prepare ntcore for merge into allwpilib.

ntcore/src/main/native/cpp/ConnectionNotifier.h

@@ -0,0 +1,72 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 2015-2018. 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 NTCORE_CONNECTIONNOTIFIER_H_
+#define NTCORE_CONNECTIONNOTIFIER_H_
+
+#include "CallbackManager.h"
+#include "Handle.h"
+#include "IConnectionNotifier.h"
+#include "ntcore_cpp.h"
+
+namespace nt {
+
+namespace impl {
+
+class ConnectionNotifierThread
+    : public CallbackThread<ConnectionNotifierThread, ConnectionNotification> {
+ public:
+  explicit ConnectionNotifierThread(int inst) : m_inst(inst) {}
+
+  bool Matches(const ListenerData& listener,
+               const ConnectionNotification& data) {
+    return true;
+  }
+
+  void SetListener(ConnectionNotification* data, unsigned int listener_uid) {
+    data->listener =
+        Handle(m_inst, listener_uid, Handle::kConnectionListener).handle();
+  }
+
+  void DoCallback(
+      std::function<void(const ConnectionNotification& event)> callback,
+      const ConnectionNotification& data) {
+    callback(data);
+  }
+
+  int m_inst;
+};
+
+}  // namespace impl
+
+class ConnectionNotifier
+    : public IConnectionNotifier,
+      public CallbackManager<ConnectionNotifier,
+                             impl::ConnectionNotifierThread> {
+  friend class ConnectionNotifierTest;
+  friend class CallbackManager<ConnectionNotifier,
+                               impl::ConnectionNotifierThread>;
+
+ public:
+  explicit ConnectionNotifier(int inst);
+
+  void Start();
+
+  unsigned int Add(std::function<void(const ConnectionNotification& event)>
+                       callback) override;
+  unsigned int AddPolled(unsigned int poller_uid) override;
+
+  void NotifyConnection(bool connected, const ConnectionInfo& conn_info,
+                        unsigned int only_listener = UINT_MAX) override;
+
+ private:
+  int m_inst;
+};
+
+}  // namespace nt
+
+#endif  // NTCORE_CONNECTIONNOTIFIER_H_