diff --git a/scheduler/periodic-task.h b/scheduler/periodic-task.h
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+++ b/scheduler/periodic-task.h
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+/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2013 University of California, Los Angeles
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author: Zhenkai Zhu <zhenkai@cs.ucla.edu>
+ *         Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#ifndef PERIODIC_TASK_H
+#define PERIODIC_TASK_H
+
+#include "task.h"
+#include "scheduler.h"
+#include "interval-generator.h"
+
+class PeriodicTask : public Task
+{
+public:
+  // generator is needed only when this is a periodic task
+  // two simple generators implementation (SimpleIntervalGenerator and RandomIntervalGenerator) are provided;
+  // if user needs more complex pattern in the intervals between calls, extend class IntervalGenerator
+  PeriodicTask(const Callback &callback, const Tag &tag, const SchedulerPtr &scheduler, const IntervalGeneratorPtr &generator);
+  virtual ~PeriodicTask(){}
+
+  // invoke callback, reset self and ask scheduler to schedule self with the next delay interval
+  virtual void
+  run() _OVERRIDE;
+
+  // set the next delay and mark as un-invoke
+  virtual void
+  reset() _OVERRIDE;
+
+private:
+  IntervalGeneratorPtr m_generator;
+};
+
+#endif // PERIODIC_TASK_H