[HICN-534] Major rework on libtransport organization

Change-Id: I361b83a18b4fd59be136d5f0817fc28e17e89884
Signed-off-by: Mauro Sardara <msardara@cisco.com>

1 files changed, 114 insertions, 0 deletions

diff --git a/libtransport/src/utils/deadline_timer.h b/libtransport/src/utils/deadline_timer.h
new file mode 100644
index 000000000..5187754f0
--- /dev/null
+++ b/libtransport/src/utils/deadline_timer.h
@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 2017-2019 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <utils/event_reactor.h>
+
+#include <chrono>
+#include <cstddef>
+#include <cstring>
+#include <utility>
+
+namespace std {
+namespace chrono {
+namespace detail {
+
+template <typename From, typename To>
+struct posix_duration_cast;
+
+// chrono -> timespec caster
+template <typename Rep, typename Period>
+struct posix_duration_cast<std::chrono::duration<Rep, Period>,
+                           struct timespec> {
+  static struct timespec cast(std::chrono::duration<Rep, Period> const &d) {
+    struct timespec tv;
+
+    std::chrono::seconds const sec =
+        std::chrono::duration_cast<std::chrono::seconds>(d);
+
+    tv.tv_sec = sec.count();
+    tv.tv_nsec =
+        std::chrono::duration_cast<std::chrono::nanoseconds>(d - sec).count();
+
+    return tv;
+  }
+};
+
+// timespec -> chrono caster
+template <typename Rep, typename Period>
+struct posix_duration_cast<struct timespec,
+                           std::chrono::duration<Rep, Period>> {
+  static std::chrono::duration<Rep, Period> cast(struct timespec const &tv) {
+    return std::chrono::duration_cast<std::chrono::duration<Rep, Period>>(
+        std::chrono::seconds(tv.tv_sec) + std::chrono::nanoseconds(tv.tv_nsec));
+  }
+};
+
+}  // namespace detail
+
+// chrono -> timespec
+template <typename T, typename Rep, typename Period>
+auto duration_cast(std::chrono::duration<Rep, Period> const &d) ->
+    typename std::enable_if<std::is_same<T, struct timespec>::value,
+                            struct timespec>::type {
+  return detail::posix_duration_cast<std::chrono::duration<Rep, Period>,
+                                     timespec>::cast(d);
+}
+
+// timespec -> chrono
+template <typename Duration>
+Duration duration_cast(struct timespec const &tv) {
+  return detail::posix_duration_cast<struct timespec, Duration>::cast(tv);
+}
+
+}  // namespace chrono
+}  // namespace std
+
+namespace utils {
+
+template <typename Implementation>
+class DeadlineTimer {
+ public:
+  virtual ~DeadlineTimer() = default;
+
+  template <typename WaitHandler>
+  void asyncWait(WaitHandler &&callback) {
+    static_cast<Implementation *>(this)->asyncWaitImpl(
+        std::forward<WaitHandler>(callback));
+  }
+
+  void wait() { static_cast<Implementation *>(this)->waitImpl(); }
+
+  template <typename T, typename R>
+  void expiresFromNow(std::chrono::duration<T, R> &&duration) {
+    static_cast<Implementation *>(this)->expiresFromNowImpl(
+        std::forward<std::chrono::duration<T, R>>(duration));
+  }
+
+  template <typename TimePoint,
+            typename = typename std::enable_if<
+                std::is_same<std::remove_reference_t<TimePoint>,
+                             std::chrono::steady_clock::time_point>::value,
+                TimePoint>::type>
+  void expiresAt(TimePoint &&time_point) {
+    static_cast<Implementation *>(this)->expiresAtImpl(
+        std::forward<TimePoint>(time_point));
+  }
+
+  void cancel() { static_cast<Implementation *>(this)->cancelImpl(); }
+};
+
+}  // namespace utils