• Need to implement IQueryParser Interface and register as OSGi-Service
• 
• Methods are called from the framework
• Idea:
  • Translate Text (query) into sequence of executor commands
  • Execute each executor command on server side

Executor Commands

• AddQueryCommand -ExecutorCommand:
  • Combine a parser, (query) text and some configurations
  • Is used by our „Mother Language“ Odysseus Script (e.g. #PARSER- and #ADDQUERY-Command)
  • In a query create a call to another compiler
• Our approach in (now) most cases: Translate to PQL Query
  • No need to handle with the underlying (logical) operator model
  • Easier to maintain
  • Can be easily moved around in the network
• Other ExecutorCommands for starting, stopping, pausing of queries or creating users, change user rights, ...
• In our first CQL version: creating user, roles etc. was directly applied from the parser of the data dictionary à Now only the information is encapsulated by the Executor Commands