Class ExpressionEvaluatingTransactionSynchronizationProcessor

All Implemented Interfaces:
Aware, BeanFactoryAware, BeanNameAware, InitializingBean, ApplicationContextAware, ExpressionCapable, NamedComponent, TransactionSynchronizationProcessor

public class ExpressionEvaluatingTransactionSynchronizationProcessor extends IntegrationObjectSupport implements TransactionSynchronizationProcessor
This implementation of TransactionSynchronizationFactory allows you to configure SpEL expressions, with their execution being coordinated (synchronized) with a transaction - see TransactionSynchronization. Expressions for before-commit, after-commit, and after-rollback are supported, together with a channel for each where the evaluation result (if any) will be sent.

For each sub-element you can specify 'expression' and/or 'channel' attributes. If only the 'channel' attribute is present the received Message will be sent there as part of a particular synchronization scenario.

If only the 'expression' attribute is present and the result of an expression is a non-Null value, a Message with the result as the payload will be generated and sent to a default channel (NullChannel) and will appear in the logs. If you want the evaluation result to go to a specific channel add a 'channel' attribute. If the result of an expression is null or void, no Message will be generated.

Gary Russell, Oleg Zhurakousky, Artem Bilan