DataWriter.h

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#ifndef CondTools_L1Trigger_DataWriter_h
#define CondTools_L1Trigger_DataWriter_h

// Framework
#include "FWCore/Framework/interface/IOVSyncValue.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Framework/interface/DataKey.h"

#include "FWCore/ServiceRegistry/interface/Service.h"
#include "CondCore/DBOutputService/interface/PoolDBOutputService.h"
#include "CondCore/CondDB/interface/Session.h"

#include "DataFormats/Provenance/interface/RunID.h"

// L1T includes
#include "CondFormats/L1TObjects/interface/L1TriggerKeyList.h"
#include "CondFormats/L1TObjects/interface/L1TriggerKey.h"

#include "CondTools/L1Trigger/interface/WriterProxy.h"

#include <string>
#include <map>

namespace l1t
{

/* This class is used to write L1 Trigger configuration data to Pool DB.
 * It also has a function for reading L1TriggerKey directly from Pool.
 *
 * In order to use this class to write payloads, user has to make sure to register datatypes that she or he is
 * interested to write to the framework. This should be done with macro REGISTER_L1_WRITER(record, type) found in
 * WriterProxy.h file. Also, one should take care to register these data types to CondDB framework with macro
 * REGISTER_PLUGIN(record, type) from registration_macros.h found in PluginSystem.
 */

class DataWriter
{
 public:
  DataWriter();
  ~DataWriter();

  // Payload and IOV writing functions.  

  // Get payload from EventSetup and write to DB with no IOV
  // recordType = "record@type", return value is payload token
  std::string writePayload( const edm::EventSetup& setup,
                const std::string& recordType ) ;

  // Use PoolDBOutputService to append IOV with sinceRun to IOV sequence
  // for given ESRecord.  PoolDBOutputService knows the corresponding IOV tag.
  // Return value is true if IOV was updated; false if IOV was already
  // up to date.
  bool updateIOV( const std::string& esRecordName,
          const std::string& payloadToken,
          edm::RunNumber_t sinceRun,
          bool logTransactions = false ) ;

  // Write L1TriggerKeyList payload and set IOV.  Takes ownership of pointer.
  void writeKeyList( L1TriggerKeyList* keyList,
             edm::RunNumber_t sinceRun = 0,
             bool logTransactions = false ) ;

  // Read object directly from Pool, not from EventSetup.
  template< class T >
  void readObject( const std::string& payloadToken,
           T& outputObject ) ;

  std::string payloadToken( const std::string& recordName,
                edm::RunNumber_t runNumber ) ;

  std::string lastPayloadToken( const std::string& recordName ) ;

  bool fillLastTriggerKeyList( L1TriggerKeyList& output ) ;

 protected:
};

template< class T >
void DataWriter::readObject( const std::string& payloadToken,
                 T& outputObject )
{
  edm::Service<cond::service::PoolDBOutputService> poolDb;
  if( !poolDb.isAvailable() )
    {
      throw cond::Exception( "DataWriter: PoolDBOutputService not available."
                 ) ;
    }
  
  cond::persistency::Session session = poolDb->session();
  session.transaction().start(true);
 
  // Get object from CondDB
  std::shared_ptr<T> ref = session.fetchPayload<T>(payloadToken) ;
  outputObject = *ref ;
  session.transaction().commit ();
}

} // ns

#endif