Avoiding ejbStore invocations on non-modified EntityBean instances
You can configure your EntityBean instances to bypass an invocation
of the ejbStore method if they have not been modified during the current transaction.
About this task
There are two options available for indicating that a particular
EJB type should only have its ejbStore method invoked if the bean has been
modified during the current transaction:
Set an EJB environment variable within the bean's deployment
descriptor
Have the bean implementation class implement a marker interface. This
second technique is especially useful if you have a number of bean implementations
that all extend a single root class; in this case you may have the root class
implement the marker interface, causing all beans that extend this class to
inherit the behavior as well.
Procedure
To use the EJB environment variable technique, edit the
EJB deployment descriptor using any standard Java 2, Enterprise Edition (J2EE)
development tool. Use the following steps as a guide. (For information on
your tool options, consult the Assembly tools article.)
Start the tool.
Select the EJB deployment descriptor of the bean you want to
work with.
Create an EJB environment variable with the name com/ibm/websphere/ejbcontainer/disableEJBStoreForNonDirtyBeans.
Set the type of this variable to java.lang.Boolean.
Set the value to True to avoid the ejbStore invocation, or False
to enable the default behavior.
Save your changes.
To use a marker interface, code your bean implementation
class to implement the com.ibm.websphere.ejbcontainer.DisableEJBStoreForNonDirtyBeans interface.
The bean implementation class need not directly implement the interface;
any parent class can implement the interface. See the com.ibm.websphere.ejbcontainer package
in the Reference > Developer > API documentation section
of the information center.
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