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There are some good explanations of EJB Transaction Attributes (and annotations) out there, for example, OpenEJB’s.
But sometimes when I try to cover this with someone who hasn’t worked with many transactional resources, I see their eyes start to glaze over.
So my question – how would you explain EJB Transaction Attributes to your grandmother?
I’m thinking a contrived example, analogy, or a concise real-world use case would be helpful.
I think it makes sense to think about this in terms of the container’s interaction with a caller to the EJB method as a true monitor… so I’d like to use a bouncer metaphor in various different scenarios.
See this page for a good description/overview of the transaction attributes.
Required (REQUIRED @TransactionAttribute)
Night club
Show up at the club, need a ticket to enter. If you don’t have one it will be (purchased?) given to you at the door.
Requires New (REQUIRES_NEW @TransactionAttribute)
Comedy clubs, 1 drink-minimum, no re-entry
Show up at the club, no outside food/drink, you must leave them at the door. To get in you must purchase 1-drink minimum every time you leave and re-enter.
Supports (SUPPORTS @TransactionAttribute)
House party
Show up at the party, alcohol is permitted. We’ll let you in with it if you have your own alcohol, if you don’t we’ll let you in too.
Mandatory (MANDATORY @TransactionAttribute)
Invite-only party
Show up at the party, need a invitation to enter: If you don’t have one and try to get in, the bouncer calls the authorities.
Not Supported (NOT_SUPPORTED @TransactionAttribute)
Concert, cameras are prohibited.
Show up at the concert, cameras are prohibited. You can leave it at the door and pick it up when you leave.
Never (NEVER @TransactionAttribute)
High school dance
Show up at the dance, alcohol is prohibited. If you try to get in with it and are caught, the chaperone calls the authorities.