web server - Borland Technical Publications

Setting Properties
Table 16.1
ejb.maxBeansInTransactions lava.lang.Integer 500*
(see
Descri
ption)
These properties are for CMP 2.x implementations only:
A transaction can access any/
large number of entities. This
property sets an upper limit on the
number of physical bean
instances that EJB container will
create. Irrespective of the number
of database entities/rows
accessed, the container will
manage to complete the
transaction with a smaller number
of entity objects (dispatchers).
The default for this is calculated
as ejb.maxBeansInCache/2. If the
ejb.maxBeansInCache property is not
set, this translates to 500.
ejb.TransactionCommitMode Enumerated Shared Indicates the disposition of an
entity bean with respect to a
transaction. Acceptable values
are:
■ Exclusive: This entity has
exclusive access to the
particular table in the
database. The state of the
bean at the end of the last
committed transaction can be
assumed to be the state of the
bean at the beginning of the
next transaction.
■ Shared: This entity shares
access to the particular table
in the database. However, for
performance reasons, a
particular bean remains
associated with a particular
primary key between
transactions to avoid
extraneous calls to
ejbActivate() and
ejbPassivate() between
transactions. The bean stays
in the active pool.
■ None: This entity shares
access to the particular table
in the database. A particular
bean does not remain
associated with a particular
primary key between
transactions, but goes back to
the ready pool after every
transaction.
Table 16.2 Entity properties for CMP 2.x
Property Type Default Description
ejb.invalidateFinde
rCollectionAtCommit
Entity properties (continued)
Property Type Default Description
java.lang.Boolean False Whether or not to optimize
transaction commit by invalidating
finder collections. CMP 2.x only.
ejb.cacheCreate java.lang.Boolean True Whether or not to attempt to cache
the insert of the entity bean until the
ejbPostCreate is processed.
148 BES Developer’s Guide