Advanced Scope control

There are a number of useful ways to interact with the scopes created by the Transaction Control Service

Determining the current scope

The Transaction Control Service has methods which can be used to work out whether a scope is in effect:

txControl.activeScope(); - When true there is a scope in effect and resources can be accessed. The scope may, or may not, be transactional. When false there is no current scope and txControl.getCurrentContext(); will return null.
txControl.activeTransaction() - When true there is a transactional scope in effect and resources can be accessed transactionally. When false there may, or may not, be a "No Transaction" scope in effect.

Note that assert txControl.activeTransaction(); can be used to enforce the presence of a transaction. This is equivalent to a "Mandatory" transaction in Spring or Java EE.

Avoiding rollback

When setting up a transaction certain exception types can be marked as not triggering rollback:

txControl.build()
 .noRollbackFor(MyCustomException.class)
 .required(() -> {
 // A MyCustomException thrown here will not trigger rollback
 });

Nesting a transaction

Nesting a Transaction can easily be managed using requiresNew()

txControl.required(() -> {
 // Do some work...

 return txControl.requiresNew(() -> {
 // Do some more work
 });
});

Suspending a transaction

Suspending a Transaction can easily be managed using notSupported()

txControl.required(() -> {
 // Do some work...

 return txControl.notSupported(() -> {
 // Do some more work
 });
});