javax.ejb
Enum TransactionAttributeType

java.lang.Object
  extended by java.lang.Enum<TransactionAttributeType>
      extended by javax.ejb.TransactionAttributeType
All Implemented Interfaces:
java.io.Serializable, java.lang.Comparable<TransactionAttributeType>

public enum TransactionAttributeType
extends java.lang.Enum<TransactionAttributeType>

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.

Since:
EJB 3.0
See Also:
TransactionAttribute

Enum Constant Summary
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.
NEVER
          The client is required to call without a transaction context, otherwise an exception is thrown.
NOT_SUPPORTED
          The container invokes an enterprise bean method whose transaction attribute NOT_SUPPORTED with an unspecified transaction context.
REQUIRED
          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.
REQUIRES_NEW
          The container must invoke an enterprise bean method whose transaction attribute is set to REQUIRES_NEW with a new transaction context.
SUPPORTS
          If the client calls with a transaction context, the container performs the same steps as described in the REQUIRED case.
 
Method Summary
static TransactionAttributeType valueOf(java.lang.String name)
          Returns the enum constant of this type with the specified name.
static TransactionAttributeType[] values()
          Returns an array containing the constants of this enum type, in the order they are declared.
 
Methods inherited from class java.lang.Enum
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf
 
Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait
 

Enum Constant Detail

MANDATORY

public static final TransactionAttributeType 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 there is no existing transaction, an exception is thrown.


REQUIRED

public static final TransactionAttributeType REQUIRED
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.


REQUIRES_NEW

public static final TransactionAttributeType REQUIRES_NEW
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.


SUPPORTS

public static final TransactionAttributeType SUPPORTS
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.


NOT_SUPPORTED

public static final TransactionAttributeType NOT_SUPPORTED
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.


NEVER

public static final TransactionAttributeType NEVER
The client is required to call without a transaction context, otherwise an exception is thrown.

Method Detail

values

public static TransactionAttributeType[] values()
Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
for (TransactionAttributeType c : TransactionAttributeType.values())
    System.out.println(c);

Returns:
an array containing the constants of this enum type, in the order they are declared

valueOf

public static TransactionAttributeType valueOf(java.lang.String name)
Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:
name - the name of the enum constant to be returned.
Returns:
the enum constant with the specified name
Throws:
IllegalArgumentException - if this enum type has no constant with the specified name
java.lang.NullPointerException - if the argument is null


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Generated on 10-February-2011 12:41


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