Strategies and Contexts

Contexts

• A context could be seen like a state of the controlled equipments.

• For instance the contexts could be:

  Shutdown	Equipments are stopped
  Run	Equipments are running
  Tests	Equipments are in test
  . . .	Equipments are . . .

• The system provides the context ALWAYS

Strategies

• A strategy defines a context or several contexts when the attribute must be stored.
• For instance if the strategy is Run the attribute will be stored when the context will be Run and not stored otherwise.
• If the strategy is Run | Tests the attribute will be stored when the context will be Run or Tests, and not stored otherwise.

TTL (Time To Live)

• The HDB++ storage is normally done forever.

• But a feature name TTL provides to specified a period for the data. After this period the data will be deleted.

  It could be useful for sepecific tests or