nearby: snapshot as of cl/296436629

Signed-off-by: Alexey Polyudov <apolyudov@google.com>
Change-Id: I2cf5bf225b76f4c1541954651f3a7544a14e0cec

cpp/platform/cancelable_alarm.cc

@@ -0,0 +1,37 @@
+#include "platform/cancelable_alarm.h"
+
+#include "platform/synchronized.h"
+
+namespace location {
+namespace nearby {
+
+template <typename Platform>
+CancelableAlarm<Platform>::CancelableAlarm(
+    const string &name, Ptr<Runnable> runnable, std::int64_t delay_millis,
+    Ptr<typename Platform::ScheduledExecutorType> scheduled_executor)
+    : name_(name),
+      lock_(Platform::createLock()),
+      cancelable_(scheduled_executor->schedule(runnable, delay_millis)) {}
+
+template <typename Platform>
+CancelableAlarm<Platform>::~CancelableAlarm() {
+  cancelable_.destroy();
+}
+
+template <typename Platform>
+bool CancelableAlarm<Platform>::cancel() {
+  Synchronized s(lock_.get());
+
+  if (cancelable_.isNull()) {
+    // TODO(tracyzhou): Add logging
+    return false;
+  }
+
+  bool canceled = cancelable_->cancel();
+  // TODO(tracyzhou): Add logging
+  cancelable_.destroy();
+  return canceled;
+}
+
+}  // namespace nearby
+}  // namespace location