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// $Id: Processing.cc,v 1.18 2011/03/07 15:31:32 mommsen Exp $

#include "EventFilter/StorageManager/interface/EventDistributor.h"
#include "EventFilter/StorageManager/interface/DiscardManager.h"
#include "EventFilter/StorageManager/interface/FragmentStore.h"
#include "EventFilter/StorageManager/interface/I2OChain.h"
#include "EventFilter/StorageManager/interface/Notifier.h"
#include "EventFilter/StorageManager/interface/SharedResources.h"
#include "EventFilter/StorageManager/interface/StateMachine.h"
#include "EventFilter/StorageManager/interface/StatisticsReporter.h"
#include "EventFilter/StorageManager/interface/TransitionRecord.h"

#include <iostream>
#include <sstream>

#include "xcept/tools.h"

using namespace std;
using namespace stor;

Processing::Processing( my_context c ): my_base(c)
{
  safeEntryAction();
}

void Processing::do_entryActionWork()
{
  TransitionRecord tr( stateName(), true );
  outermost_context().updateHistory( tr );
  outermost_context().setExternallyVisibleState( "Enabled" );
  outermost_context().getNotifier()->reportNewState( "Enabled" );
}

Processing::~Processing()
{
  safeExitAction();
}

void Processing::do_exitActionWork()
{
  TransitionRecord tr( stateName(), false );
  outermost_context().updateHistory( tr );
}

string Processing::do_stateName() const
{
  return std::string( "Processing" );
}

void Processing::do_moveToFailedState( xcept::Exception& exception ) const
{
  outermost_context().getSharedResources()->moveToFailedState( exception );
}

void Processing::logEndRunRequest( const EndRun& request )
{
  outermost_context().unconsumed_event( request );
}

void
Processing::do_processI2OFragment( I2OChain& frag ) const
{
  static unsigned int noFragmentCount = 0;

  FragmentStore* fragmentStore = outermost_context().getFragmentStore();
  bool completed = fragmentStore->addFragment(frag);
  if ( completed )
  {
    // The run number check has to be done before the event is added to the
    // queues, as for some event types, e.g. error events, the run number
    // match is enforced.
    try
    {
      uint32_t runNumber = outermost_context().getSharedResources()->configuration_->getRunNumber();
      frag.assertRunNumber(runNumber);
    }
    catch(stor::exception::RunNumberMismatch &e)
    {
      // Just raise an alarm, but continue to process the event
      outermost_context().getSharedResources()->statisticsReporter_->
        alarmHandler()->notifySentinel(AlarmHandler::ERROR, e);
    }
    outermost_context().getEventDistributor()->addEventToRelevantQueues(frag);
    outermost_context().getSharedResources()->discardManager_->sendDiscardMessage(frag);
  }
  else
  {
    // Only do the check every 100th fragment
    // TODO: shall we make this number configurable?
    ++noFragmentCount;
    if ( noFragmentCount >= 100 )
    {
      noFragmentCount = 0;
      this->noFragmentToProcess();
    }
  }

  // 12-Aug-2009, KAB - I put the sampling of the fragment store size
  // *after* the code to add fragments to the store and move them from the
  // fragment store to the relevant queues (when needed) so that the baseline
  // number of events in the fragment store is zero.  For example, when
  // disk writing is slow or stopped, the stream queue fills up, and there
  // is backpressure within the SM, the true number of events in the fragment
  // store is zero, and putting the sampling here reflects that.
  ThroughputMonitorCollection& tmc = 
    outermost_context().getSharedResources()->statisticsReporter_->
    getThroughputMonitorCollection();
  tmc.setFragmentStoreSize(fragmentStore->size());
  tmc.setFragmentStoreMemoryUsed(fragmentStore->memoryUsed());
}

void
Processing::do_noFragmentToProcess() const
{
  I2OChain staleEvent;

  WorkerThreadParams workerParams =
    outermost_context().getSharedResources()->configuration_->getWorkerThreadParams();
  bool gotStaleEvent = 
    outermost_context().getFragmentStore()->
    getStaleEvent(staleEvent, workerParams.staleFragmentTimeOut_);

  if ( gotStaleEvent )
  {
    outermost_context().getSharedResources()->discardManager_->sendDiscardMessage(staleEvent);
    outermost_context().getEventDistributor()->addEventToRelevantQueues(staleEvent);
  }
  outermost_context().getEventDistributor()->checkForStaleConsumers();
}