30.12. Special components

Certain Seam component classes can be installed multiple times under names specified in the Seam configuration. For example, the following lines in components.xml install and configure two Seam components:

<component name="bookingDatabase" 
           class="org.jboss.seam.persistence.ManagedPersistenceContext"> 
  <property name="persistenceUnitJndiName">
    java:/comp/emf/bookingPersistence
  </ property> 
</component> 

<component name="userDatabase" 
           class="org.jboss.seam.persistence.ManagedPersistenceContext"> 
  <property name="persistenceUnitJndiName">
    java:/comp/emf/userPersistence
  </ property> 
</component>

The Seam component names are bookingDatabase and userDatabase.

<entityManager>, org.jboss.seam.persistence.ManagedPersistenceContext

A manager component for a conversation-scoped, managed EntityManager with an extended persistence context.

<entityManager>.entityManagerFactory — a value binding expression that evaluates to an instance of EntityManagerFactory.
<entityManager>.persistenceUnitJndiName — the JNDI name of the entity manager factory. By default, this is java:/<managedPersistenceContext> .

<entityManagerFactory>, org.jboss.seam.persistence.EntityManagerFactory

Manages a JPA EntityManagerFactory. This is most useful when using JPA outside of an environment with EJB3 support.

entityManagerFactory.persistenceUnitName — the name of the persistence unit.

See the API JavaDoc for further configuration properties.

<session>, org.jboss.seam.persistence.ManagedSession

A manager component for a conversation-scoped, managed Hibernate Session.

<session>.sessionFactory — a value binding expression that evaluates to an instance of SessionFactory.
<session>.sessionFactoryJndiName — the JNDI name of the session factory. By default, this is java:/<managedSession>.

<sessionFactory>, org.jboss.seam.persistence.HibernateSessionFactory

Manages a Hibernate SessionFactory.

<sessionFactory>.cfgResourceName — specifies the path to the configuration file. By default, this is hibernate.cfg.xml.

See the API JavaDoc for further configuration properties.

<managedQueueSender>, org.jboss.seam.jms.ManagedQueueSender

A manager component for an event scoped managed JMS QueueSender.

<managedQueueSender>.queueJndiName — the JNDI name of the JMS queue.

<managedTopicPublisher>, org.jboss.seam.jms.ManagedTopicPublisher

A manager component for an event-scoped, managed JMS TopicPublisher.

<managedTopicPublisher>.topicJndiName — the JNDI name of the JMS topic.

<managedWorkingMemory>, org.jboss.seam.drools.ManagedWorkingMemory

A manager component for a conversation-scoped, managed Drools WorkingMemory.

<managedWorkingMemory>.ruleBase — a value expression that evaluates to an instance of RuleBase.

<ruleBase>, org.jboss.seam.drools.RuleBase

A manager component for an application-scoped Drools RuleBase. Note that this does not support dynamic installation of new rules, so it is not appropriate for use in production.

<ruleBase>.ruleFiles — a list of files containing Drools rules.
<ruleBase>.dslFile — a Drools DSL definition.