Gemfire JavaDocs
Package org.apache.geode.cache
Interface TransactionWriter
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- All Superinterfaces:
CacheCallback,Declarable
public interface TransactionWriter extends CacheCallback
A callback that is allowed to veto a transaction. Only one TransactionWriter can exist per cache, and only one TransactionWriter will be fired in the entire distributed system for each transaction.This writer can be used to update a backend data source before the GemFire cache is updated during commit. If the backend update fails, the implementer can throw a
TransactionWriterExceptionto veto the transaction.WARNING: To avoid risk of deadlock, do not invoke CacheFactory.getAnyInstance() from within any callback methods. Instead use TransactionEvent.getCache().
- Since:
- GemFire 6.5
- See Also:
CacheTransactionManager.setWriter(org.apache.geode.cache.TransactionWriter)
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description voidbeforeCommit(TransactionEvent event)Called before the transaction has finished committing, but after conflict checking.-
Methods inherited from interface org.apache.geode.cache.CacheCallback
close
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Methods inherited from interface org.apache.geode.cache.Declarable
init, initialize
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Method Detail
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beforeCommit
void beforeCommit(TransactionEvent event) throws TransactionWriterException
Called before the transaction has finished committing, but after conflict checking. Provides an opportunity for implementors to cause transaction abort by throwing a TransactionWriterException- Parameters:
event- the TransactionEvent- Throws:
TransactionWriterException- in the event that the transaction should be rolled back- See Also:
CacheTransactionManager.commit()
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