Propagation (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.transaction.annotation
Enum Propagation

java.lang.Object
  java.lang.Enum<Propagation>
      org.springframework.transaction.annotation.Propagation

All Implemented Interfaces:: Serializable, Comparable<Propagation>

public enum Propagation
extends Enum<Propagation>
extends Enum<Propagation>

Enumeration that represents transaction propagation behaviors for use with the JDK 1.5+ transaction annotation, corresponding to the TransactionDefinition interface.

Since:: 1.2
Author:: Colin Sampaleanu, Juergen Hoeller
See Also:: Transactional, TransactionDefinition

Enum Constant Summary

MANDATORY
          Support a current transaction, throw an exception if none exists.

NESTED
          Execute within a nested transaction if a current transaction exists, behave like PROPAGATION_REQUIRED else.

NEVER
          Execute non-transactionally, throw an exception if a transaction exists.

NOT_SUPPORTED
          Execute non-transactionally, suspend the current transaction if one exists.

REQUIRED
          Support a current transaction, create a new one if none exists.

REQUIRES_NEW
          Create a new transaction, suspend the current transaction if one exists.

SUPPORTS
          Support a current transaction, execute non-transactionally if none exists.

Method Summary

int value()


static Propagation valueOf(String name)
          Returns the enum constant of this type with the specified name.

static Propagation[] 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 Summary
`MANDATORY` Support a current transaction, throw an exception if none exists.
`NESTED` Execute within a nested transaction if a current transaction exists, behave like PROPAGATION_REQUIRED else.
`NEVER` Execute non-transactionally, throw an exception if a transaction exists.
`NOT_SUPPORTED` Execute non-transactionally, suspend the current transaction if one exists.
`REQUIRED` Support a current transaction, create a new one if none exists.
`REQUIRES_NEW` Create a new transaction, suspend the current transaction if one exists.
`SUPPORTS` Support a current transaction, execute non-transactionally if none exists.

Method Summary
`int`	`value()`
`static Propagation`	`valueOf(String name)` Returns the enum constant of this type with the specified name.
`static Propagation[]`	`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

REQUIRED

public static final Propagation REQUIRED

Support a current transaction, create a new one if none exists. Analogous to EJB transaction attribute of the same name.

This is the default setting of a transaction annotation.

SUPPORTS

public static final Propagation SUPPORTS

Support a current transaction, execute non-transactionally if none exists. Analogous to EJB transaction attribute of the same name.

Note: For transaction managers with transaction synchronization, PROPAGATION_SUPPORTS is slightly different from no transaction at all, as it defines a transaction scopp that synchronization will apply for. As a consequence, the same resources (JDBC Connection, Hibernate Session, etc) will be shared for the entire specified scope. Note that this depends on the actual synchronization configuration of the transaction manager.

See Also:: AbstractPlatformTransactionManager.setTransactionSynchronization(int)

MANDATORY

public static final Propagation MANDATORY

Support a current transaction, throw an exception if none exists. Analogous to EJB transaction attribute of the same name.

REQUIRES_NEW

public static final Propagation REQUIRES_NEW

Create a new transaction, suspend the current transaction if one exists. Analogous to EJB transaction attribute of the same name.

Note: Actual transaction suspension will not work on out-of-the-box on all transaction managers. This in particular applies to JtaTransactionManager, which requires the javax.transaction.TransactionManager to be made available it to it (which is server-specific in standard J2EE).

See Also:: JtaTransactionManager.setTransactionManager(javax.transaction.TransactionManager)

NOT_SUPPORTED

public static final Propagation NOT_SUPPORTED

Execute non-transactionally, suspend the current transaction if one exists. Analogous to EJB transaction attribute of the same name.

See Also:: JtaTransactionManager.setTransactionManager(javax.transaction.TransactionManager)

NEVER

public static final Propagation NEVER

Execute non-transactionally, throw an exception if a transaction exists. Analogous to EJB transaction attribute of the same name.

NESTED

public static final Propagation NESTED

Execute within a nested transaction if a current transaction exists, behave like PROPAGATION_REQUIRED else. There is no analogous feature in EJB.

Note: Actual creation of a nested transaction will only work on specific transaction managers. Out of the box, this only applies to the JDBC DataSourceTransactionManager when working on a JDBC 3.0 driver. Some JTA providers might support nested transactions as well.

See Also:: DataSourceTransactionManager

Method Detail

values

public static Propagation[] 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 (Propagation c : Propagation.values())
    System.out.println(c);

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

valueOf

public static Propagation valueOf(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; NullPointerException - if the argument is null

value

public int value()