// Copyright (c) 2003-2014, Jodd Team (jodd.org). All Rights Reserved.
package jodd.jtx.worker;
import jodd.jtx.JtxTransactionManager;
import jodd.jtx.JtxTransaction;
import jodd.jtx.JtxTransactionMode;
import jodd.log.Logger;
import jodd.log.LoggerFactory;
/**
* Lean transaction worker helps dealing transactions when they were requested
* in several places, usually in separated methods. This worker knows when requested transaction is
* the same as current one, or completely new. It might be useful for aspects.
*/
public class LeanJtxWorker {
private static final Logger log = LoggerFactory.getLogger(LeanJtxWorker.class);
protected final JtxTransactionManager txManager;
public LeanJtxWorker(JtxTransactionManager txManager) {
this.txManager = txManager;
}
/**
* Returns transaction manager.
*/
public JtxTransactionManager getTransactionManager() {
return txManager;
}
/**
* Returns current transaction or <code>null</code> if there is no transaction at the moment.
*/
public JtxTransaction getCurrentTransaction() {
return txManager.getTransaction();
}
/**
* Requests for transaction and returns non-null value <b>only</b> when new transaction
* is created! When <code>null</code> is returned, transaction may be get by
* {@link #getCurrentTransaction()}.
*
* @see jodd.jtx.JtxTransactionManager#requestTransaction(jodd.jtx.JtxTransactionMode)
*/
public JtxTransaction maybeRequestTransaction(JtxTransactionMode txMode, Object scope) {
if (txMode == null) {
return null;
}
JtxTransaction currentTx = txManager.getTransaction();
JtxTransaction requestedTx = txManager.requestTransaction(txMode, scope);
if (currentTx == requestedTx) {
return null;
}
return requestedTx;
}
/**
* Commits transaction if created in the same level where this method is invoked.
* Returns <code>true</code> if transaction was actually committed or <code>false</code>
* if transaction was not created on this level.
*/
public boolean maybeCommitTransaction(JtxTransaction tx) {
if (tx == null) {
return false;
}
log.debug("commit tx");
tx.commit();
return true;
}
/**
* Rollbacks transaction if created in the same scope where this method is invoked.
* If not, current transaction is marked for rollback.
* Returns <code>true</code> if transaction was actually roll backed.
*/
public boolean markOrRollbackTransaction(JtxTransaction tx, Throwable cause) {
if (tx == null) {
tx = getCurrentTransaction();
if (tx == null) {
return false;
}
log.debug("set rollback only tx");
tx.setRollbackOnly(cause);
return false;
}
log.debug("rollback tx");
tx.rollback();
return true;
}
}