util: scheduler::ScopedEventId to automatically cancel scheduled events upon destruction
Change-Id: I3254983ab27480143c778baa28de7eb0409b26ce
Refs: #2442
diff --git a/src/util/scheduler-scoped-event-id.hpp b/src/util/scheduler-scoped-event-id.hpp
new file mode 100644
index 0000000..89cab89
--- /dev/null
+++ b/src/util/scheduler-scoped-event-id.hpp
@@ -0,0 +1,82 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2015 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ */
+
+#ifndef NDN_UTIL_SCHEDULER_SCOPED_EVENT_ID_HPP
+#define NDN_UTIL_SCHEDULER_SCOPED_EVENT_ID_HPP
+
+#include "scheduler.hpp"
+
+namespace ndn {
+namespace util {
+namespace scheduler {
+
+/** \brief Event that is automatically cancelled upon destruction
+ */
+class ScopedEventId : noncopyable
+{
+public:
+ /** \brief Construct ScopedEventId tied to the specified scheduler
+ * \param scheduler Scheduler to which the event is tied. Behavior is undefined if
+ * scheduler is destructed before an uncanceled ScopedEventId.
+ */
+ explicit
+ ScopedEventId(Scheduler& scheduler);
+
+ /** \brief move constructor
+ */
+ ScopedEventId(ScopedEventId&& other);
+
+ /** \brief assigns an event
+ *
+ * If a different event has been assigned to this instance previously,
+ * that event will be cancelled immediately.
+ *
+ * \note The caller should ensure that ScopedEventId is tied to a correct scheduler.
+ * Behavior is undefined when assigning event scheduled in another scheduler instance.
+ */
+ ScopedEventId&
+ operator=(const EventId& event);
+
+ /** \brief cancels the event
+ */
+ ~ScopedEventId();
+
+ /** \brief cancels the event manually
+ */
+ void
+ cancel();
+
+ /** \brief releases the event so that it won't be canceled
+ * when this ScopedEventId is destructed
+ */
+ void
+ release();
+
+private:
+ Scheduler* m_scheduler; // pointer to allow move semantics
+ EventId m_event;
+};
+
+} // namespace scheduler
+} // namespace util
+} // namespace ndn
+
+#endif // NDN_UTIL_SCHEDULER_SCOPED_EVENT_ID_HPP