diff --git a/src/event-scheduler.cpp b/src/event-scheduler.cpp
index b823255..77b86d2 100644
--- a/src/event-scheduler.cpp
+++ b/src/event-scheduler.cpp
@@ -1,34 +1,99 @@
 #include "event-scheduler.h"
+#include <utility>
 
-Task::Task(const Callback &callback, void *arg, const Tag &tag)
+#define EVLOOP_NO_EXIT_ON_EMPTY 0x04
+
+IntervalGeneratorPtr
+IntervalGenerator:: Null;
+
+void
+eventCallback(evutil_socket_t fd, short what, void *arg)
+{
+  Task *task = static_cast<Task *>(arg);
+  task->run();
+  task = NULL;
+}
+
+Task::Task(const Callback &callback, const Tag &tag, const SchedulerPtr &scheduler, const IntervalGeneratorPtr &generator)
      : m_callback(callback)
-     , m_arg(arg)
      , m_tag(tag)
+     , m_scheduler(scheduler)
+     , m_invoked(false)
+     , m_event(NULL)
+     , m_tv(NULL)
+     , m_generator(generator)
 {
+  m_event = evtimer_new(scheduler->base(), eventCallback, this);
+  m_tv = new timeval;
 }
 
-Task::Task(const Task &other)
-     : m_callback(other.m_callback)
-     , m_arg(other.m_arg)
-     , m_tag(other.m_tag)
+Task::~Task()
 {
+  if (m_event != NULL)
+  {
+    event_free(m_event);
+    m_event = NULL;
+  }
+
+  if (m_tv != NULL)
+  {
+    delete m_tv;
+    m_tv = NULL;
+  }
 }
 
-Task &
-Task::operator=(const Task &other)
+void
+Task::run()
 {
-  m_callback = other.m_callback;
-  m_arg = other.m_arg;
-  m_tag = other.m_tag;
-  return (*this);
+  if (!m_invoked)
+  {
+    m_callback();
+    m_invoked = true;
+  }
+  if (isPeriodic())
+  {
+    reset();
+    m_scheduler->rescheduleTask(m_tag);
+  }
+  else
+  {
+    selfClean();
+  }
 }
 
-RandomIntervalGenerator::RandomIntervalGenerator(double interval, double percent, Direction direction = UP)
+void
+Task::selfClean()
+{
+  m_scheduler->deleteTask(m_tag);
+}
+
+void
+Task::reset()
+{
+  m_invoked = false;
+  if (isPeriodic())
+  {
+    double interval = m_generator->nextInterval();
+    setTv(interval);
+  }
+}
+
+void
+Task::setTv(double delay)
+{
+  double intPart, fraction;
+  fraction = modf(abs(delay), &intPart);
+  m_tv->tv_sec = static_cast<int>(intPart);
+  m_tv->tv_usec = static_cast<int>((fraction * 1000000));
+}
+
+RandomIntervalGenerator::RandomIntervalGenerator(double interval, double percent, Direction direction)
                         : m_interval(interval)
                         , m_rng(time(NULL))
                         , m_percent(percent)
                         , m_dist(0.0, fractional(percent))
                         , m_random(m_rng, m_dist)
+                        , m_direction(direction)
 {
 }
 
@@ -42,8 +107,140 @@
   case UP: interval = m_interval * (1.0 + percent); break;
   case DOWN: interval = m_interval * (1.0 - percent); break;
   case EVEN: interval = m_interval * (1.0 - m_percent/2.0 + percent); break;
-  default: break
+  default: break;
   }
 
   return interval;
 }
+
+Scheduler::Scheduler()
+{
+  evthread_use_pthreads();
+  m_base = event_base_new();
+}
+
+Scheduler::~Scheduler()
+{
+  event_base_free(m_base);
+}
+
+void
+Scheduler::eventLoop()
+{
+  event_base_loop(m_base, EVLOOP_NO_EXIT_ON_EMPTY);
+}
+
+void
+Scheduler::start()
+{
+  m_thread = boost::thread(&Scheduler::eventLoop, this);
+}
+
+void
+Scheduler::shutdown()
+{
+  event_base_loopbreak(m_base);
+  m_thread.join();
+}
+
+bool
+Scheduler::addTask(const TaskPtr &task, double delay)
+{
+  TaskPtr newTask = task;
+  newTask->setTv(delay);
+  if (addToMap(newTask))
+  {
+    evtimer_add(newTask->ev(), newTask->tv());
+    return true;
+  }
+  return false;
+}
+
+bool
+Scheduler::addTask(const TaskPtr &task)
+{
+  TaskPtr newTask = task;
+  if (!newTask->isPeriodic())
+  {
+    return false;
+  }
+
+  if (addToMap(newTask))
+  {
+    newTask->reset();
+    evtimer_add(newTask->ev(), newTask->tv());
+    return true;
+  }
+
+  return false;
+}
+
+void
+Scheduler::rescheduleTask(const Task::Tag &tag)
+{
+  ReadLock(m_mutex);
+  TaskMapIt it = m_taskMap.find(tag);
+  if (it != m_taskMap.end())
+  {
+    TaskPtr task = it->second;
+    if (task->isPeriodic())
+    {
+      evtimer_add(task->ev(), task->tv());
+    }
+  }
+}
+
+bool
+Scheduler::addToMap(const TaskPtr &task)
+{
+  WriteLock(m_mutex);
+  if (m_taskMap.find(task->tag()) == m_taskMap.end())
+  {
+    m_taskMap.insert(make_pair(task->tag(), task));
+    return true;
+  }
+  return false;
+}
+
+void
+Scheduler::deleteTask(const Task::Tag &tag)
+{
+  WriteLock(m_mutex);
+  TaskMapIt it = m_taskMap.find(tag);
+  if (it != m_taskMap.end())
+  {
+    TaskPtr task = it->second;
+    evtimer_del(task->ev());
+    m_taskMap.erase(it);
+  }
+}
+
+void
+Scheduler::deleteTask(const Task::TaskMatcher &matcher)
+{
+  WriteLock(m_mutex);
+  TaskMapIt it = m_taskMap.begin();
+  while(it != m_taskMap.end())
+  {
+    TaskPtr task = it->second;
+    if (matcher(task))
+    {
+      evtimer_del(task->ev());
+      // Use post increment; map.erase invalidate the iterator that is beening erased,
+      // but does not invalidate other iterators. This seems to be the convention to
+      // erase something from C++ STL map while traversing.
+      m_taskMap.erase(it++);
+    }
+    else
+    {
+      ++it;
+    }
+  }
+}
+
+int
+Scheduler::size()
+{
+  ReadLock(m_mutex);
+  return m_taskMap.size();
+}