run table existence query only once for a table name
make sqlite update method synchronized so that reading threads don’t need to wait to get an instance
share jobManager and jobOperator instances among threads
fix false return for table exist method call
rename cctoolsOperator to jobOperator
refactoring some codes and messages
remove class variables to modularize
add catalog server port information to configuration instance
rename cctoolsOperator to jobOperator
refactoring some codes and messages
remove class variables to modularize
add catalog server port information to configuration instance