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## org.springframework.ejb.support
Class AbstractMessageDrivenBean

    java.lang.Object
      org.springframework.ejb.support.AbstractEnterpriseBean
          org.springframework.ejb.support.AbstractMessageDrivenBean

All Implemented Interfaces:
  Serializable, EnterpriseBean, MessageDrivenBean

Direct Known Subclasses:
  AbstractJmsMessageDrivenBean

    public abstract class AbstractMessageDrivenBean

extends AbstractEnterpriseBean
implements MessageDrivenBean

Convenient base class for EJB 2.x MDBs. Doesn't require JMS, as EJB 2.1 MDBs are no longer JMS-specific; see the `AbstractJmsMessageDrivenBean` subclass.

This class ensures that subclasses have access to the MessageDrivenContext provided by the EJB container, and implement a no-arg `ejbCreate()` method as required by the EJB specification. This `ejbCreate()` method loads a BeanFactory, before invoking the `onEjbCreate()` method, which is supposed to contain subclass-specific initialization.

NB: We cannot use final methods to implement EJB API methods, as this violates the EJB specification. However, there should be no need to override the `setMessageDrivenContext` or `ejbCreate()` methods.

Author:
  Rod Johnson
See Also:
  Serialized Form

Field Summary
`protected Log` | `logger` Logger available to subclasses

Fields inherited from class org.springframework.ejb.support.AbstractEnterpriseBean
`BEAN_FACTORY_PATH_ENVIRONMENT_KEY`

Constructor Summary
`AbstractMessageDrivenBean()`

Method Summary
`void` | `ejbCreate()` Lifecycle method required by the EJB specification but not the MessageDrivenBean interface.
`protected MessageDrivenContext` | `getMessageDrivenContext()` Convenience method for subclasses to use.
`protected abstract void` | `onEjbCreate()` Subclasses must implement this method to do any initialization they would otherwise have done in an `ejbCreate()` method.
`void` | `setMessageDrivenContext(MessageDrivenContext messageDrivenContext)` Required lifecycle method.

Methods inherited from class org.springframework.ejb.support.AbstractEnterpriseBean
`ejbRemove, getBeanFactory, onEjbRemove, setBeanFactoryLocator, setBeanFactoryLocatorKey`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Methods inherited from interface javax.ejb.MessageDrivenBean
`ejbRemove`

Field Detail

### logger

    protected final Log logger

  Logger available to subclasses

Constructor Detail

### AbstractMessageDrivenBean

    public AbstractMessageDrivenBean()

Method Detail

### setMessageDrivenContext

    public void setMessageDrivenContext(MessageDrivenContext messageDrivenContext)

  Required lifecycle method. Sets the MessageDriven context.

  Specified by:
    `setMessageDrivenContext` in interface `MessageDrivenBean`
  Parameters:
    `messageDrivenContext` - MessageDrivenContext

### getMessageDrivenContext

    protected final MessageDrivenContext getMessageDrivenContext()

  Convenience method for subclasses to use.

  Returns:
    the MessageDrivenContext passed to this EJB by the EJB container

### ejbCreate

    public void ejbCreate()

  Lifecycle method required by the EJB specification but not the MessageDrivenBean interface. This implementation loads the BeanFactory.

  Don't override it (although it can't be made final): code initialization in onEjbCreate(), which is called when the BeanFactory is available.

  Unfortunately we can't load the BeanFactory in setSessionContext(), as resource manager access isn't permitted and the BeanFactory may require it.

### onEjbCreate

    protected abstract void onEjbCreate()

  Subclasses must implement this method to do any initialization they would otherwise have done in an `ejbCreate()` method. In contrast to `ejbCreate()`, the BeanFactory will have been loaded here.

  The same restrictions apply to the work of this method as to an `ejbCreate()` method.

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