If the resource manager did not commit the transaction and the
* parameter onePhase is set to true, the resource manager may throw
* one of the XA_RB* exceptions. Upon return, the resource manager has
* rolled back the branch's work and has released all held resources.
*/
public void commit(Xid xid, boolean onePhase) throws XAException {
check(xid); // check if xid is valid
GlobalTID tid = new GlobalTID(xid);
if (onePhase) {
// Synchronizers invoked by coord.beforeCompletion must be
// executed with the transaction context of the transaction
// that is being committed as specified in
// in method javax.Synchronization.beforeCompletion
try {
CurrentTransaction.recreate(tid, 0);
} catch (Throwable e) {
// failed check for concurrent activity
XAException xaExc = new XAException(XAException.XAER_PROTO);
xaExc.initCause(e);
throw xaExc;
}
} else {
// check for concurrrent activity
if (RecoveryManager.readAndUpdateTxMap(tid) == false) {
throw new XAException(XAException.XAER_PROTO);
}
}
boolean exceptionFlag = false;
int errorCode = XAException.XAER_PROTO;
try {
// First of all make sure it has been recovered if necessary
RecoveryManager.waitForRecovery();
// Look up the Coordinator for the transaction.
TopCoordinator coord = (TopCoordinator)
RecoveryManager.getCoordinator(tid);
if (coord == null) { // error to receive commit more than once
errorCode = XAException.XAER_PROTO;
throw new XAException(errorCode);
}
// If there is a Coordinator, lock it for the duration of this
// operation. Tell the Coordinator to commit.
synchronized (coord) {
if (onePhase) {
coord.beforeCompletion();
if (coord.getParticipantCount() == 1) {
coord.commitOnePhase();
} else {
Vote vote = Vote.VoteRollback;
try {
vote = coord.prepare();
} catch (HeuristicMixed exc) {
errorCode = XAException.XA_HEURHAZ;
throw new XAException(errorCode);
}
if (vote == Vote.VoteCommit) {
coord.commit();
} else if (vote == Vote.VoteRollback) {
coord.rollback(true);
}
}
} else {
coord.commit();
}
}
} catch (Throwable exc) {
exceptionFlag = true;
XAException xaExc = new XAException(errorCode);
xaExc.initCause(exc);
throw xaExc;
} finally {
if (onePhase) {
// Complete full transactional context created for
// beforeCompletion calls in prepare phase of one phase commit.
try {
CurrentTransaction.release(tid);
} catch (Throwable t) {
if (!exceptionFlag) {
XAException xaExc = new XAException(XAException.XAER_PROTO);
xaExc.initCause(t);
throw xaExc;
}
}
} else {
Thread thread = RecoveryManager.removeFromTxMap(tid);
if (thread == null || (thread != Thread.currentThread())) { // error
if (!exceptionFlag) {
throw new XAException(XAException.XAER_RMERR);
}
}
}
}
}
/**
* Tells the resource manager to forget about a heuristically
* completed transaction branch.
*
* @param xid A global transaction identifier.
*
* @exception XAException An error has occurred. Possible exception
* values are XAER_RMERR, XAER_RMFAIL, XAER_NOTA, XAER_INVAL, or
* XAER_PROTO.
*/
public void forget(Xid xid) throws XAException {}
/**
* Ask the resource manager to prepare for a transaction commit
* of the transaction specified in xid.
*
* @param xid A global transaction identifier.
*
* @exception XAException An error has occurred. Possible exception
* values are: XA_RB*, XAER_RMERR, XAER_RMFAIL, XAER_NOTA, XAER_INVAL,
* or XAER_PROTO.
*
* @return A value indicating the resource manager's vote on the
* outcome of the transaction. The possible values are: XA_RDONLY
* or XA_OK. These constants are defined in
* javax.transaction.xa.XATerminator interface.
* If the resource manager wants to roll back the
* transaction, it should do so by raising an appropriate XAException
* in the prepare method.
*/
public int prepare(Xid xid) throws XAException {
check(xid); // check if xid is valid
GlobalTID tid = new GlobalTID(xid);
try {
// Synchronizers invoked by coord.beforeCompletion must be
// executed with the transaction context of the transaction
// that is being committed as specified in
// in method javax.Synchronization.beforeCompletion
CurrentTransaction.recreate(tid, 0);
} catch (Throwable e) {
// failed check for concurrent activity for transaction tid.
XAException xaExc = new XAException(XAException.XAER_PROTO);
xaExc.initCause(e);
throw xaExc;
}
boolean exceptionFlag = false;
int errorCode = XAException.XAER_PROTO;
try {
// First of all make sure it has been recovered if necessary
RecoveryManager.waitForRecovery();
// Look up the Coordinator for the transaction.
TopCoordinator coord = (TopCoordinator)
RecoveryManager.getCoordinator(tid);
if (coord == null) { // error to receive prepare more than once
errorCode = XAException.XAER_PROTO;
throw new XAException(errorCode);
}
// If there is a Coordinator, lock it for the duration of this
// operation. Tell the Coordinator to commit.
synchronized (coord) {
coord.beforeCompletion();
Vote vote = coord.prepare();
if (vote == Vote.VoteRollback) {
errorCode = XAException.XA_RBROLLBACK;
} else if (vote == Vote.VoteCommit) {
return XAResource.XA_OK;
} else if (vote == Vote.VoteReadOnly) {
return XAResource.XA_RDONLY;
}
throw new XAException(errorCode);
}
} catch (Throwable exc) {
exceptionFlag = true;
XAException xaExc = new XAException(errorCode);
xaExc.initCause(exc);
throw xaExc;
} finally {
try {
CurrentTransaction.release(tid);
} catch (Throwable t) {
if (!exceptionFlag) {
errorCode = XAException.XAER_PROTO;
XAException xaExc = new XAException(errorCode);
xaExc.initCause(t);
throw xaExc;
}
// else allow original exception to be thrown
}
}
}
/**
* Obtains a list of prepared transaction branches from a resource
* manager. The transaction manager calls this method during recovery
* to obtain the list of transaction branches that are currently in
* prepared or heuristically completed states.
*
* @param flag One of TMSTARTRSCAN, TMENDRSCAN, TMNOFLAGS. TMNOFLAGS
* must be used when no other flags are set in the parameter. These
* constants are defined in javax.transaction.xa.XATerminator
* interface.
*
* @exception XAException An error has occurred. Possible values are
* XAER_RMERR, XAER_RMFAIL, XAER_INVAL, and XAER_PROTO.
*
* @return The resource manager returns zero or more XIDs of the
* transaction branches that are currently in a prepared or
* heuristically completed state. If an error occurs during the
* operation, the resource manager should throw the appropriate
* XAException.
*/
public Xid[] recover(int flag) throws XAException {
// wait for recovery to be completed.
RecoveryManager.waitForResync();
return (Xid[]) TimeoutManager.getInDoubtXids();
}
/**
* Informs the resource manager to roll back work done on behalf
* of a transaction branch.
*
* @param xid A global transaction identifier.
*
* @exception XAException An error has occurred. Possible XAExceptions are
* XA_HEURHAZ, XA_HEURCOM, XA_HEURRB, XA_HEURMIX, XAER_RMERR, XAER_RMFAIL,
* XAER_NOTA, XAER_INVAL, or XAER_PROTO.
*
*
If the transaction branch is already marked rollback-only the * resource manager may throw one of the XA_RB* exceptions. Upon return, * the resource manager has rolled back the branch's work and has released * all held resources. */ public void rollback(Xid xid) throws XAException { check(xid); // check if xid is valid GlobalTID tid = new GlobalTID(xid); // check for concurrent activity if (RecoveryManager.readAndUpdateTxMap(tid) == false) { throw new XAException(XAException.XAER_PROTO); } boolean exceptionFlag = false; int errorCode = XAException.XAER_PROTO; try { // First of all make sure it has been recovered if necessary RecoveryManager.waitForRecovery(); // Look up the Coordinator for the transaction. TopCoordinator coord = (TopCoordinator) RecoveryManager.getCoordinator(tid); if (coord == null) { // error to receive rollback more than once errorCode = XAException.XAER_PROTO; throw new XAException(errorCode); } // If there is a Coordinator, lock it for the duration of this // operation. Tell the Coordinator to commit. synchronized (coord) { coord.rollback(true); } } catch (Throwable exc) { exceptionFlag = true; XAException xaExc = new XAException(errorCode); xaExc.initCause(exc); throw xaExc; } finally { Thread thread = RecoveryManager.removeFromTxMap(tid); if (thread == null || (thread != Thread.currentThread())) { // error if (!exceptionFlag) { throw new XAException(XAException.XAER_RMERR); } } } } }