Basic HTML version of Foils prepared July 6 99

Foil 113 Servant Policies

From Object Web Computing Technologies CPS714 Computational Science Information Track -- June 16 99. by H. Timucin Ozdemir
1 In the EJB model, operations are invoked on the EJBObject while in the CORBA model the POA provides the necessary support to intercept the method dispatches.
2 POA uses a Servant object to dispatch the incoming call to the object. Servant's lifetime policies are:
  • method : container activates the component every operation request and passivates it after the completion.
  • transaction : container activates the component on the first operation request within a transaction and passivates the component after the transaction ends.
  • component : the container activates the component on the first operation request and keep it activate until the component requests to be passivated.
  • container : the container activates the component on the first operation request and decides when the component should be passivated.
in Table To:

© Northeast Parallel Architectures Center, Syracuse University, npac@npac.syr.edu

If you have any comments about this server, send e-mail to webmaster@npac.syr.edu.

Page produced by wwwfoil on Tue Jul 6 1999