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package com.sun.jts.CosTransactions;
import javax.transaction.xa.Xid;
import javax.transaction.xa.XAException;
import javax.transaction.xa.XAResource;
import javax.resource.spi.XATerminator;
import org.omg.CosTransactions.Vote;
import org.omg.CosTransactions.HeuristicMixed;
import com.sun.enterprise.transaction.api.TransactionImport;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
/**
* This is used for transaction completion and crash recovery flows.
*
* @version 1.0
* @author Ram Jeyaraman
*/
public class XATerminatorImpl implements XATerminator {
private static void check(Xid xid) throws XAException {
// check if xid is valid
if (xid == null || xid.getFormatId() == 0 ||
xid.getBranchQualifier() == null ||
xid.getGlobalTransactionId() == null) {
throw new XAException(XAException.XAER_NOTA);
}
}
/**
* Commits the global transaction specified by xid.
*
* @param xid A global transaction identifier
*
* @param onePhase If true, the resource manager should use a one-phase
* commit protocol to commit the work done on behalf of xid.
*
* @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 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 {
recreate(xid, 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;
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 {
release(xid);
} 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) { // no exception yet
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
recreate(xid, 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 {
release(xid);
} 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);
}
}
}
}
static private final TransactionImport tim = getTransactionImportManager();
// no standardized JNDI name exists across as implementations for TM, this is Sun App Server specific.
private static final String AS_TXN_MGR_JNDI_NAME = "java:appserver/TransactionManager";
static private Object jndiLookup(final String jndiName) {
Object result = null;
try {
final Context ctx = new InitialContext();
result = ctx.lookup(jndiName);
} catch (NamingException e) { }
return result;
}
static private TransactionImport getTransactionImportManager() {
return (TransactionImport)jndiLookup(AS_TXN_MGR_JNDI_NAME);
}
static private void recreate(Xid xid, int timeout) {
if (tim != null) {
tim.recreate(xid, timeout);
}
}
static private void release(Xid xid) {
if (tim != null) {
tim.release(xid);
}
}
}