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State the Bene ts and Costs of Container-Managed Persistence
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n setRollbackOnly()
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Marks the current transaction so that a rollback is the only outcome of that transaction. Tests to see whether the current transaction of an instance has been marked for rollback. Entity bean instances must not call this method, which returns the javax.transaction.UserTransaction interface.
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n getRollbackOnly()
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n getUserTransaction()
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The XML Deployment Descriptor The deployment descriptor is used to declare entity bean persistent fields (cmp-fields) as well as field relationships (cmr-fields). It contains information about entity bean persistence and container-managed relationships in the form of XML elements. This information, known as the abstract persistence schema, includes the following:
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n The ejb-name for each entity bean, which must be unique within an
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n The abstract-schema-name for each entity bean, which must be unique
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within an ejb-jar file. This name can be used when specifying EJB QL queries.
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n The ejb-relation set, containing a pair of ejb-relationship-role elements. n The ejb-relationship-role, which describes a relationship role, including its
name, its multiplicity within a relation, and its navigability. The name of the cmr-field is specified from the perspective of the relationship participant. Each relationship role refers to an entity bean via an ejb-name element contained in the relationship-role-source element.
Container-Created Objects
After all the required interfaces and abstract classes are designed and developed by the enterprise bean provider, they are introspected by EJB container. It examines the entity bean s deployment descriptor to create concrete objects that have the additional functionality required to integrate the business logic with the requirements of the EJB distributed object framework. These classes include the following:
n Bean class
Extends the abstract entity bean class, which implements the EntityBean interface. Implements the remote home interface EJBHome. The EJB container makes these instances accessible to the clients through JNDI.
n EJBHome class
7: Enterprise JavaBeans and the EJB Container Model
n EJBObject class
Implements the remote interface EJBObject. Implements the local home interface EJBLocalHome. Implements the local interface EJBLocalObject.
n EJBLocalHome class n EJBLocalObject class
Figure 7-8 illustrates EJB objects provided by beans and containers. Entity bean objects are considered to be persistent objects; their lifetime isn t limited by the lifetime of the JVM process in which the entity bean instance executes. To illustrate, a JVM crash might result in a rollback of a transaction, but it will neither destroy previously created entity objects nor invalidate references interfaces held by clients.
EJB Clients (Prior to EJB 3.0)
Two types of EJB clients exist: remote clients that exist outside of an EJB container and local clients that exist inside of an EJB container. Multiple clients can access an entity object simultaneously while the EJB container synchronizes access to the entity objects via a transaction manager. EJB containers make home interfaces available in a JNDI name space, therefore making these home interfaces available to clients. The home interfaces of entity beans allow clients to create, find, and remove entity objects within the enterprise bean s home domain. These interfaces also allow clients to execute static home business methods that aren t specific to a particular entity bean object.
FIGURE 7-8
EJBObjects provided by enterprise bean provider and EJB container
State the Bene ts and Costs of Container-Managed Persistence
Remote Clients
Remote clients can be enterprise beans deployed in the same or different EJB containers, stand-alone Java applications or applets via Java APIs for remote object invocation, or non-Java clients such as CORBA clients. A remote client can get a reference to an existing entity object s remote interface in any of the following ways:
n Receive the reference as a parameter in a method call as an input parameter
or a result.
n Find the entity object using a finder() method defined in the entity bean s
remote home interface.
n Obtain the reference from the entity object s handle.
A client that has a reference to an entity object s remote interface can do the following:
n Invoke business methods on the entity object through the remote interface. n Obtain a reference to the enterprise bean s remote home interface. n Pass the reference as a parameter or return value of a method call. n Obtain the entity object s primary key. n Obtain the entity object s handle. n Remove the entity object.
The physical location of the EJB container is usually transparent to the client. A client locates an entity bean s home interface by using the JNDI, which enables applications to access multiple naming and directory services using a single interface. A client s JNDI name space can be configured to contain the home interfaces of enterprise beans located on multiple EJB containers on multiple machines on a network. A client that is to be interoperable with compliant EJB containers must use the javax.rmi.PortableRemoteObject.narrow() method to perform typenarrowing of the client-side representations of the remote home and remote interfaces. The remote home interface ItemRemoteHome for the ItemMasterBean entity bean can be located using the following code segment:
Context initialContext = new InitialContext(); ItemRemoteHome itemHome = (ItemRemoteHome) javax.rmi.PortableRemoteObject.narrow( initialContext.lookup("java:ucny/um2z8/items"), ItemRemoteHome.class);
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