[jboss-dev-forums] [Design the new POJO MicroContainer] - Re: Handling contexts in error

[alesj]

"adrian at jboss.org" wrote : 
  | PROPOSAL
  | 
  | I've had a seperate thought which is probably more acceptable to both
  | you and to me, ;-)
  | 
  | What you really want to do is manage the state of the failed beans.
  | i.e. you want to takeover the management of the context in error from the MC
  | and fix it manually.
  | 
  | So my solution would be to allow something like:
  | 
  | xml pseudo code as always ;-)
  | 
  |   | <bean ... error-handling="manual"/>
  |   | 
  | 
  | If for example the bean threw an error in start() then we no longer just discard
  | this bean. Instead we would effectively change its controller mode to "manual"
  | (if it isn't already) and just then revert it to the previous state. i.e. Created in this case
  | or back to Instantiated if the property configuration failed.
  | 
  | You can then pick up the management of the bean from there.
  | When you decide to move the bean, we would just clear the error in the 
  | controller context and try again (reverting back to automatic if the bean
  | was previously in that mode).
  | 
  | We would never try to move a context in such a state without an
  | explicit request on the controller to do so.
  | 
  | I don't think this would require a major change in the Controller,
  | most of the work would be in the IncompleteDeploymentException
  | where we would now have to check all contexts at all states
  | to see whether it has an error set (previously we just retrieved those
  | in the **ERROR** state).
  | 
  | We may want to only allow this for checked exceptions. i.e. if start throws
  | a RuntimeException or Error, we would still discard the bean
  | or perhaps make it configurable?
  | 
  | This semantic would deal with my objections above and give you the
  | ability to manage the failing beans/contexts without having to re-install them.
Are there any other hooks (api changes), apart ErrorHandlingMode enum, you've had in mind?
Picking up bean in the Controller can be done with Controller::change.

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