DBService.h

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#ifndef RecoLuminosity_LumiProducer_DBService_h
#define RecoLuminosity_LumiProducer_DBService_h
#include "FWCore/ParameterSet/interface/ParameterSet.h"

#include "RelationalAccess/ISessionProxy.h"
#include "RelationalAccess/ConnectionService.h"

#include <string>
#include <mutex>
#include <memory>

namespace lumi{
  class DBConfig;
  namespace service{

    class ISessionProxyPtr {
    public:
      ISessionProxyPtr( std::unique_ptr<coral::ISessionProxy> iProxy,
                        std::unique_lock<std::mutex> iLock):
          m_lock(std::move(iLock)),
          m_proxy(std::move(iProxy)) {}

          coral::ISessionProxy* operator->() {
            return m_proxy.get();
          }
    private:
          std::unique_lock<std::mutex> m_lock;
          std::unique_ptr<coral::ISessionProxy> m_proxy;
   };

    class DBService{
    public:
      DBService(const edm::ParameterSet& iConfig);
      ~DBService();

      ISessionProxyPtr connectReadOnly( const std::string& connectstring );

    private:
      std::unique_ptr<coral::ConnectionService> m_svc;
      std::unique_ptr<lumi::DBConfig> m_dbconfig;
      std::mutex m_mutex;
    };//cl DBService
  }//ns service
}//ns lumi
#endif