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package javax.ejb;
/**
* The enum TransactionAttributeType is used with the
* TransactionAttribute annotation to specify whether the
* methods of a session bean or message driven bean are called with a
* valid transaction context.
*
*
* For a message-driven bean's message listener methods (or interface), only
* the REQUIRED and NOT_SUPPORTED values may be used.
*
*
* For an enterprise bean's timeout callback methods, only the
* REQUIRED, REQUIRES_NEW and NOT_SUPPORTED
* values may be used.
*
*
* For a session bean's asynchronous business methods, only the
* REQUIRED, REQUIRES_NEW, and NOT_SUPPORTED
* values may be used.
*
*
* For a singleton session bean's PostConstruct and PreDestroy
* lifecycle callback interceptor methods, only the REQUIRED,
* REQUIRES_NEW, and NOT_SUPPORTED values may be used.
*
*
* If an enterprise bean implements the SessionSynchronization interface
* or uses any of the session synchronization annotations, only the following values
* may be used for the transaction attributes of the bean's methods:
* REQUIRED, REQUIRES_NEW, MANDATORY.
*
* @see TransactionAttribute
*
* @since EJB 3.0
*/
public enum TransactionAttributeType {
/**
* If a client invokes the enterprise bean's method while the client
* is associated with a transaction context, the container invokes the
* enterprise bean's method in the client's transaction context.
*
*
* If there is no existing transaction, an exception is thrown.
*/
MANDATORY,
/**
* If a client invokes the enterprise bean's method while the client is
* associated with a transaction context, the container invokes the
* enterprise bean's method in the client's transaction context.
*
*
* If the client invokes the enterprise bean's method while the client is
* not associated with a transaction context, the container automatically
* starts a new transaction before delegating a method call to the enterprise
* bean method.
*/
REQUIRED,
/**
* The container must invoke an enterprise bean method whose transaction
* attribute is set to REQUIRES_NEW with a new transaction context.
*
*
* If the client invokes the enterprise bean's method while the client is not
* associated with a transaction context, the container automatically starts
* a new transaction before delegating a method call to the enterprise bean
* business method.
*
*
If a client calls with a transaction context, the container
* suspends the association of the transaction context with the current thread
* before starting the new transaction and invoking the method. The container
* resumes the suspended transaction association after the method and the
* new transaction have been completed.
*/
REQUIRES_NEW,
/**
* If the client calls with a transaction context, the container performs
* the same steps as described in the REQUIRED case.
*
*
* If the client calls without a transaction context, the container performs the
* same steps as described in the NOT_SUPPORTED case.
*
*
* The SUPPORTS transaction attribute must be used with caution.
* This is because of the different transactional semantics provided by the
* two possible modes of execution. Only enterprise beans that will execute
* correctly in both modes should use the SUPPORTS
* transaction attribute.
*/
SUPPORTS,
/**
* The container invokes an enterprise bean method whose transaction
* attribute NOT_SUPPORTED with an unspecified transaction context.
*
*
* If a client calls with a transaction context, the container suspends the
* association of the transaction context with the current thread before
* invoking the enterprise bean's business method. The container resumes
* the suspended association when the business method has completed.
*/
NOT_SUPPORTED,
/**
* The client is required to call without a transaction context, otherwise
* an exception is thrown.
*/
NEVER
}