org.springframework.transaction.support

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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.transaction.support 
org.springframework.transaction.support
Support classes for the org.springframework.transaction package. Provides an abstract base class for transaction manager implementations, and a template plus callback for transaction demarcation.
Java Source File NameTypeComment
AbstractPlatformTransactionManager.javaClass Abstract base class that implements Spring's standard transaction workflow, serving as basis for concrete platform transaction managers like org.springframework.transaction.jta.JtaTransactionManager and org.springframework.jdbc.datasource.DataSourceTransactionManager .

This base class provides the following workflow handling:

  • determines if there is an existing transaction;
  • applies the appropriate propagation behavior;
  • suspends and resumes transactions if necessary;
  • checks the rollback-only flag on commit;
  • applies the appropriate modification on rollback (actual rollback or setting rollback-only);
  • triggers registered synchronization callbacks (if transaction synchronization is active).

Subclasses have to implement specific template methods for specific states of a transaction, e.g.: begin, suspend, resume, commit, rollback. The most important of them are abstract and must be provided by a concrete implementation; for the rest, defaults are provided, so overriding is optional.

Transaction synchronization is a generic mechanism for registering callbacks that get invoked at transaction completion time.

AbstractTransactionStatus.javaClass Abstract base implementation of the org.springframework.transaction.TransactionStatus interface.
CallbackPreferringPlatformTransactionManager.javaInterface Extension of the org.springframework.transaction.PlatformTransactionManager interface, exposing a method for executing a given callback within a transaction.

Implementors of this interface automatically express a preference for callbacks over programmatic getTransaction, commit and rollback calls.

DefaultTransactionDefinition.javaClass Default implementation of the TransactionDefinition interface, offering bean-style configuration and sensible default values (PROPAGATION_REQUIRED, ISOLATION_DEFAULT, TIMEOUT_DEFAULT, readOnly=false).
DefaultTransactionStatus.javaClass Default implementation of the org.springframework.transaction.TransactionStatus interface, used by AbstractPlatformTransactionManager .
ResourceHolderSupport.javaClass Convenient base class for resource holders.
ResourceTransactionManager.javaInterface Extension of the org.springframework.transaction.PlatformTransactionManager interface, indicating a native resource transaction manager, operating on a single target resource.
SimpleTransactionStatus.javaClass A simple org.springframework.transaction.TransactionStatus implementation.

Derives from AbstractTransactionStatus and adds an explicit SimpleTransactionStatus.isNewTransaction() "newTransaction" flag.

This class is not used by any of Spring's pre-built org.springframework.transaction.PlatformTransactionManager implementations.

SmartTransactionObject.javaInterface Interface to be implemented by transaction objects that are able to return an internal rollback-only marker, typically from a another transaction that has participated and marked it as rollback-only.
TransactionCallback.javaInterface Callback interface for transactional code.
TransactionCallbackWithoutResult.javaClass Simple convenience class for TransactionCallback implementation. Allows for implementing a doInTransaction version without result, i.e.
TransactionOperations.javaInterface Interface specifying basic transaction execution operations. Implemented by TransactionTemplate .
TransactionSynchronization.javaInterface Interface for transaction synchronization callbacks. Supported by AbstractPlatformTransactionManager.

TransactionSynchronization implementations can implement the Ordered interface to influence their execution order.

TransactionSynchronizationAdapter.javaClass Simple TransactionSynchronization adapter containing empty method implementations, for easier overriding of single methods.

Also implements the Ordered interface to enable the execution order of synchronizations to be controlled declaratively.

TransactionSynchronizationManager.javaClass Central helper that manages resources and transaction synchronizations per thread. To be used by resource management code but not by typical application code.

Supports one resource per key without overwriting, that is, a resource needs to be removed before a new one can be set for the same key. Supports a list of transaction synchronizations if synchronization is active.

Resource management code should check for thread-bound resources, e.g.

TransactionSynchronizationUtils.javaClass Utility methods for triggering specific TransactionSynchronization callback methods on all currently registered synchronizations.
TransactionTemplate.javaClass Template class that simplifies programmatic transaction demarcation and transaction exception handling.

The central method is TransactionTemplate.execute , supporting transactional code that implements the TransactionCallback interface.

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