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/**
* Copyright (C) 2000-2017 Atomikos
*
* LICENSE CONDITIONS
*
* See http://www.atomikos.com/Main/WhichLicenseApplies for details.
*/
package com.atomikos.datasource.xa;
import java.util.Map;
import javax.transaction.xa.XAException;
import javax.transaction.xa.XAResource;
import javax.transaction.xa.Xid;
import com.atomikos.datasource.ResourceException;
import com.atomikos.datasource.ResourceTransaction;
import com.atomikos.icatch.CompositeTransaction;
import com.atomikos.icatch.HeurCommitException;
import com.atomikos.icatch.HeurHazardException;
import com.atomikos.icatch.HeurMixedException;
import com.atomikos.icatch.HeurRollbackException;
import com.atomikos.icatch.Participant;
import com.atomikos.icatch.RollbackException;
import com.atomikos.icatch.SysException;
import com.atomikos.logging.Logger;
import com.atomikos.logging.LoggerFactory;
import com.atomikos.recovery.TxState;
import com.atomikos.util.Assert;
/**
*
*
* An implementation of ResourceTransaction for XA transactions.
*/
public class XAResourceTransaction implements ResourceTransaction, Participant {
private static final Logger LOGGER = LoggerFactory.createLogger(XAResourceTransaction.class);
static final long serialVersionUID = -8227293322090019196L;
private static String interpretErrorCode(String resourceName,
String opCode, Xid xid, int errorCode) {
String msg = "unkown";
switch (errorCode) {
case XAException.XAER_RMFAIL:
msg = "the XA resource has become unavailable";
break;
case XAException.XA_RBROLLBACK:
msg = "the XA resource has rolled back for an unspecified reason";
break;
case XAException.XA_RBCOMMFAIL:
msg = "the XA resource rolled back due to a communication failure";
break;
case XAException.XA_RBDEADLOCK:
msg = "the XA resource has rolled back because of a deadlock";
break;
case XAException.XA_RBINTEGRITY:
msg = "the XA resource has rolled back due to a constraint violation";
break;
case XAException.XA_RBOTHER:
msg = "the XA resource has rolled back for an unknown reason";
break;
case XAException.XA_RBPROTO:
msg = "the XA resource has rolled back because it did not expect this command in the current context";
break;
case XAException.XA_RBTIMEOUT:
msg = "the XA resource has rolled back because the transaction took too long";
break;
case XAException.XA_RBTRANSIENT:
msg = "the XA resource has rolled back for a temporary reason - the transaction can be retried later";
break;
case XAException.XA_NOMIGRATE:
msg = "XA resume attempted in a different place from where suspend happened";
break;
case XAException.XA_HEURHAZ:
msg = "the XA resource may have heuristically completed the transaction";
break;
case XAException.XA_HEURCOM:
msg = "the XA resource has heuristically committed";
break;
case XAException.XA_HEURRB:
msg = "the XA resource has heuristically rolled back";
break;
case XAException.XA_HEURMIX:
msg = "the XA resource has heuristically committed some parts and rolled back other parts";
break;
case XAException.XA_RETRY:
msg = "the XA command had no effect and may be retried";
break;
case XAException.XA_RDONLY:
msg = "the XA resource had no updates to perform for this transaction";
break;
case XAException.XAER_RMERR:
msg = "the XA resource detected an internal error";
break;
case XAException.XAER_NOTA:
msg = "the supplied XID is invalid for this XA resource";
break;
case XAException.XAER_INVAL:
msg = "invalid arguments were given for the XA operation";
break;
case XAException.XAER_PROTO:
msg = "the XA resource did not expect this command in the current context";
break;
case XAException.XAER_DUPID:
msg = "the supplied XID already exists in this XA resource";
break;
case XAException.XAER_OUTSIDE:
msg = "the XA resource is currently involved in a local (non-XA) transaction";
break;
default:
msg = "unknown";
}
return "XA resource '" + resourceName + "': " + opCode + " for XID '"
+ xidToHexString(xid) + "' raised " + errorCode + ": " + msg;
}
private String tid, root;
private boolean isXaSuspended;
private TxState state;
private String resourcename;
private transient XID xid;
private transient String xidToHexString;
private transient String toString;
private void setXid(XID xid) {
this.xid = xid;
this.xidToHexString = xidToHexString(xid);
this.toString = "XAResourceTransaction: " + this.xidToHexString;
}
private transient final XATransactionalResource resource;
private transient XAResource xaresource;
private transient boolean knownInResource;
private transient int timeout;
XAResourceTransaction(XATransactionalResource resource,
CompositeTransaction transaction, String root) {
Assert.notNull("resource cannot be null", resource);
this.resource=resource;
this.timeout = (int) transaction.getTimeout() / 1000;
this.tid = transaction.getTid();
this.root = root;
this.resourcename = resource.getName();
setXid(this.resource.createXid(this.tid));
setState(TxState.ACTIVE);
this.isXaSuspended = false;
this.knownInResource = false;
}
void setState(TxState state) {
if (state.isHeuristic()) {
LOGGER.logError("Heuristic termination of " + toString() + " with state " + state);
}
this.state = state;
}
static String xidToHexString(Xid xid) {
String gtrid = StringUtils.byteArrayToHexString(xid
.getGlobalTransactionId());
String bqual = StringUtils.byteArrayToHexString(xid
.getBranchQualifier());
return gtrid + ":" + bqual;
}
protected void testOrRefreshXAResourceFor2PC() throws XAException {
try {
// fix for case 31209: refresh entire XAConnection on heur hazard
if (this.state == TxState.HEUR_HAZARD)
forceRefreshXAConnection();
else if (this.xaresource != null) { // null if connection failure
assertConnectionIsStillAlive();
}
} catch (XAException xa) {
// timed out?
if (LOGGER.isTraceEnabled())
LOGGER.logTrace(this.resourcename
+ ": XAResource needs refresh", xa);
this.xaresource = this.resource.getXAResource();
}
}
private void assertConnectionIsStillAlive() throws XAException {
this.xaresource.isSameRM(this.xaresource);
}
private void forceRefreshXAConnection() throws XAException {
if (LOGGER.isTraceEnabled())
LOGGER.logTrace(this.resourcename
+ ": forcing refresh of XAConnection...");
try {
this.xaresource = this.resource.refreshXAConnection();
} catch (ResourceException re) {
LOGGER.logWarning(this.resourcename
+ ": could not refresh XAConnection", re);
}
}
/**
* Needed for garbage collection of res tx instances: if no new siblings can
* arrive, this method removes any pointers to res txs in the resource
*/
private void terminateInResource() {
if (this.resource != null)
this.resource.removeSiblingMap(this.root);
}
/**
* @see ResourceTransaction.
*/
public String getTid() {
return this.tid;
}
/**
* @see ResourceTransaction.
*/
@Override
public synchronized void suspend() throws ResourceException {
// BugzID: 20545
// State may be IN_DOUBT or TERMINATED when a connection is closed AFTER
// commit!
// In that case, don't call END again, and also don't generate any
// error!
// This is required for some hibernate connection release strategies.
if (this.state.equals(TxState.ACTIVE)) {
try {
if (LOGGER.isDebugEnabled()) {
LOGGER.logDebug("XAResource.end ( " + this.xidToHexString
+ " , XAResource.TMSUCCESS ) on resource "
+ this.resourcename
+ " represented by XAResource instance "
+ this.xaresource);
}
this.xaresource.end(this.xid, XAResource.TMSUCCESS);
} catch (XAException xaerr) {
String msg = interpretErrorCode(this.resourcename, "end",
this.xid, xaerr.errorCode);
if (LOGGER.isTraceEnabled())
LOGGER.logTrace(msg, xaerr);
// don't throw: fix for case 102827
}
setState(TxState.LOCALLY_DONE);
}
}
boolean supportsTmJoin() {
return !(this.resource.usesWeakCompare()
|| this.resource.acceptsAllXAResources() || isActive());
}
/**
* @see ResourceTransaction.
*/
@Override
public synchronized void resume() throws ResourceException {
int flag = 0;
String logFlag = "";
if (this.state.equals(TxState.LOCALLY_DONE)) {// reused instance
flag = XAResource.TMJOIN;
logFlag = "XAResource.TMJOIN";
} else if (!this.knownInResource) {// new instance
flag = XAResource.TMNOFLAGS;
logFlag = "XAResource.TMNOFLAGS";
} else
throw new IllegalStateException("Wrong state for resume: "
+ this.state);
try {
if (LOGGER.isDebugEnabled()) {
LOGGER.logDebug("XAResource.start ( " + this.xidToHexString
+ " , " + logFlag + " ) on resource "
+ this.resourcename
+ " represented by XAResource instance "
+ this.xaresource);
}
this.xaresource.start(this.xid, flag);
} catch (XAException xaerr) {
String msg = interpretErrorCode(this.resourcename, "resume",
this.xid, xaerr.errorCode);
LOGGER.logWarning(msg, xaerr);
throw new ResourceException(msg, xaerr);
}
setState(TxState.ACTIVE);
this.knownInResource = true;
}
/**
* @see Participant
*/
@Override
public void setCascadeList(Map allParticipants)
throws SysException {
// nothing to do: local participant
}
public Object getState() {
return this.state;
}
private boolean beforePrepare() {
return TxState.ACTIVE.equals(this.state)
|| TxState.LOCALLY_DONE.equals(this.state);
}
/**
* @see Participant
*/
@Override
public void setGlobalSiblingCount(int count) {
// nothing to be done here
}
/**
* @see Participant
*/
@Override
public synchronized void forget() {
terminateInResource();
try {
if (this.xaresource != null) { // null if recovery failed
this.xaresource.forget(this.xid);
}
} catch (Exception err) {
LOGGER.logTrace("Error forgetting xid: " + this.xid, err);
// we don't care here
}
setState(TxState.TERMINATED);
}
/**
* @see Participant
*/
@Override
public synchronized int prepare() throws RollbackException,
HeurHazardException, HeurMixedException, SysException {
int ret = 0;
terminateInResource();
if (TxState.ACTIVE == this.state) {
// tolerate non-delisting apps/servers
suspend();
}
// duplicate prepares can happen for siblings in serial subtxs!!!
// in that case, the second prepare just returns READONLY
if (this.state == TxState.IN_DOUBT)
return Participant.READ_ONLY;
else if (!(this.state == TxState.LOCALLY_DONE))
throw new SysException("Wrong state for prepare: " + this.state);
try {
// refresh xaresource for MQSeries: seems to close XAResource after
// suspend???
testOrRefreshXAResourceFor2PC();
if (LOGGER.isTraceEnabled()) {
LOGGER.logTrace("About to call prepare on XAResource instance: "
+ this.xaresource);
}
ret = this.xaresource.prepare(this.xid);
} catch (XAException xaerr) {
String msg = interpretErrorCode(this.resourcename, "prepare",
this.xid, xaerr.errorCode);
if (XAException.XA_RBBASE <= xaerr.errorCode
&& xaerr.errorCode <= XAException.XA_RBEND) {
LOGGER.logWarning(msg, xaerr); // see case 84253
throw new RollbackException(msg);
} else {
LOGGER.logError(msg, xaerr);
throw new SysException(msg, xaerr);
}
}
setState(TxState.IN_DOUBT);
if (ret == XAResource.XA_RDONLY) {
if (LOGGER.isDebugEnabled()) {
LOGGER.logDebug("XAResource.prepare ( " + this.xidToHexString
+ " ) returning XAResource.XA_RDONLY " + "on resource "
+ this.resourcename
+ " represented by XAResource instance "
+ this.xaresource);
}
return Participant.READ_ONLY;
} else {
if (LOGGER.isDebugEnabled()) {
LOGGER.logDebug("XAResource.prepare ( " + this.xidToHexString
+ " ) returning OK " + "on resource "
+ this.resourcename
+ " represented by XAResource instance "
+ this.xaresource);
}
return Participant.READ_ONLY + 1;
}
}
/**
* @see Participant.
*/
@Override
public synchronized void rollback()
throws HeurCommitException, HeurMixedException,
HeurHazardException, SysException {
terminateInResource();
if (rollbackShouldDoNothing()) {
return;
}
if (this.state.equals(TxState.TERMINATED)) {
return;
}
if (this.state.equals(TxState.HEUR_MIXED))
throw new HeurMixedException();
if (this.state.equals(TxState.HEUR_COMMITTED))
throw new HeurCommitException();
if (this.xaresource == null) {
throw new HeurHazardException("XAResourceTransaction "
+ getXid() + ": no XAResource to rollback?");
}
try {
if (this.state.equals(TxState.ACTIVE)) { // first suspend xid
suspend();
}
// refresh xaresource for MQSeries: seems to close XAResource after
// suspend???
testOrRefreshXAResourceFor2PC();
if (LOGGER.isDebugEnabled()) {
LOGGER.logDebug("XAResource.rollback ( " + this.xidToHexString
+ " ) " + "on resource " + this.resourcename
+ " represented by XAResource instance "
+ this.xaresource);
}
this.xaresource.rollback(this.xid);
} catch (ResourceException resErr) {
// failure of suspend
throw new SysException("Error in rollback: " + resErr.getMessage(),
resErr);
} catch (XAException xaerr) {
String msg = interpretErrorCode(this.resourcename, "rollback",
this.xid, xaerr.errorCode);
if (XAException.XA_RBBASE <= xaerr.errorCode
&& xaerr.errorCode <= XAException.XA_RBEND) {
if (LOGGER.isTraceEnabled())
LOGGER.logTrace(msg);
} else {
LOGGER.logWarning(msg, xaerr);
switch (xaerr.errorCode) {
case XAException.XA_HEURHAZ:
setState(TxState.HEUR_HAZARD);
throw new HeurHazardException();
case XAException.XA_HEURMIX:
setState(TxState.HEUR_MIXED);
throw new HeurMixedException();
case XAException.XA_HEURCOM:
setState(TxState.HEUR_COMMITTED);
throw new HeurCommitException();
case XAException.XA_HEURRB:
forget();
break;
case XAException.XAER_NOTA:
// see case 21552
if (LOGGER.isTraceEnabled()) {
LOGGER.logTrace("XAResource.rollback: invalid Xid - already rolled back in resource?");
}
setState(TxState.TERMINATED);
// ignore error - corresponds to semantics of rollback!
break;
default:
// fix for bug 31209
setState(TxState.HEUR_HAZARD);
throw new SysException(msg, xaerr);
}
}
}
setState(TxState.TERMINATED);
}
private boolean rollbackShouldDoNothing() {
return !this.knownInResource && beforePrepare();
}
/**
* @see Participant
*/
@Override
public synchronized void commit(boolean onePhase)
throws HeurRollbackException, HeurHazardException,
HeurMixedException, RollbackException, SysException {
terminateInResource();
if (this.state.equals(TxState.TERMINATED))
return;
if (this.state.equals(TxState.HEUR_MIXED))
throw new HeurMixedException();
if (this.state.equals(TxState.HEUR_ABORTED))
throw new HeurRollbackException();
if (this.xaresource == null) {
String msg = toString + ": no XAResource to commit?";
LOGGER.logError(msg);
throw new HeurHazardException(msg);
}
try {
if (TxState.ACTIVE.equals(this.state)) {
// tolerate non-delisting apps/servers
suspend();
}
} catch (ResourceException re) {
// happens if already rolled back or something else;
// in any case the transaction can be trusted to act
// as if rollback already happened
throw new com.atomikos.icatch.RollbackException(re.getMessage());
}
if (!(this.state.isOneOf(TxState.LOCALLY_DONE, TxState.IN_DOUBT, TxState.HEUR_HAZARD)))
throw new SysException("Wrong state for commit: " + this.state);
try {
// refresh xaresource for MQSeries: seems to close XAResource after suspend???
if (!onePhase) { // cf case 167209
testOrRefreshXAResourceFor2PC();
}
if (LOGGER.isDebugEnabled()) {
LOGGER.logDebug("XAResource.commit ( " + this.xidToHexString
+ " , " + onePhase + " ) on resource " + this.resourcename +
" represented by XAResource instance " + this.xaresource);
}
this.xaresource.commit(this.xid, onePhase);
} catch (XAException xaerr) {
String msg = interpretErrorCode(this.resourcename, "commit",
this.xid, xaerr.errorCode);
LOGGER.logWarning(msg, xaerr);
if (XAException.XA_RBBASE <= xaerr.errorCode
&& xaerr.errorCode <= XAException.XA_RBEND) {
if (!onePhase)
throw new SysException(msg, xaerr);
else
throw new com.atomikos.icatch.RollbackException(
"Already rolled back in resource.");
} else {
switch (xaerr.errorCode) {
case XAException.XA_HEURHAZ:
setState(TxState.HEUR_HAZARD);
throw new HeurHazardException();
case XAException.XA_HEURMIX:
setState(TxState.HEUR_MIXED);
throw new HeurMixedException();
case XAException.XA_HEURCOM:
forget();
break;
case XAException.XA_HEURRB:
setState(TxState.HEUR_ABORTED);
throw new HeurRollbackException();
case XAException.XAER_NOTA:
if (!onePhase) {
// see case 21552
LOGGER.logWarning("XAResource.commit: invalid Xid - transaction already committed in resource?");
setState(TxState.TERMINATED);
break;
}
default:
// fix for bug 31209
setState(TxState.HEUR_HAZARD);
throw new SysException(msg, xaerr);
}
}
}
setState(TxState.TERMINATED);
}
/**
* Absolutely necessary for coordinator to work correctly
*/
@Override
public boolean equals(Object o) {
if (this == o)
return true;
// NOTE: basing equals on the xid means that if two
// different instances for the same xid exist then these
// will be considered the same, and a second will
// NOT be added to the coordinator's participant list.
// However, this is not a problem, since the first added instance
// will do all commit work (they are equivalent).
// Note that this can ONLY happen for two invocations of the
// SAME local composite transaction to the SAME resource.
// Because INSIDE ONE local transaction there is no
// internal parallellism, having two invocations to the same
// resource execute with the same xid is not a problem.
if (!(o instanceof XAResourceTransaction))
return false;
XAResourceTransaction other = (XAResourceTransaction) o;
return this.xid.equals(other.xid);
}
/**
* Absolutely necessary for coordinator to work correctly
*/
@Override
public int hashCode() {
return this.xidToHexString.hashCode();
}
@Override
public String toString() {
return this.toString;
}
/**
* Get the Xid. Needed by jta mappings.
*
* @return Xid The Xid of this restx.
*/
public Xid getXid() {
return this.xid;
}
/**
* Set the XAResource attribute.
*
* @param xaresource
* The new XAResource to use. This new XAResource represents the
* new connection to the XA database. Necessary because on reuse,
* the old xaresource may be in use by another thread, for
* another transaction.
*/
public void setXAResource(XAResource xaresource) {
if (LOGGER.isTraceEnabled())
LOGGER.logTrace(this + ": about to switch to XAResource "
+ xaresource);
this.xaresource = xaresource;
try {
this.xaresource.setTransactionTimeout(this.timeout);
} catch (XAException e) {
String msg = interpretErrorCode(this.resourcename,
"setTransactionTimeout", this.xid, e.errorCode);
LOGGER.logWarning(msg, e);
// we don't care
}
if (LOGGER.isTraceEnabled())
LOGGER.logTrace("XAResourceTransaction " + getXid()
+ ": switched to XAResource " + xaresource);
}
/**
* Perform an XA suspend.
*/
public void xaSuspend() throws XAException {
// cf case 61305: make XA suspend idempotent so appserver suspends do
// not interfere with our suspends (triggered by transaction suspend)
if (!this.isXaSuspended) {
try {
if (LOGGER.isDebugEnabled()) {
LOGGER.logDebug("XAResource.suspend ( "
+ this.xidToHexString
+ " , XAResource.TMSUSPEND ) on resource "
+ this.resourcename
+ " represented by XAResource instance "
+ this.xaresource);
}
this.xaresource.end(this.xid, XAResource.TMSUSPEND);
this.isXaSuspended = true;
} catch (XAException xaerr) {
String msg = interpretErrorCode(this.resourcename, "suspend",
this.xid, xaerr.errorCode);
LOGGER.logWarning(msg, xaerr);
throw xaerr;
}
}
}
/**
* Perform an xa resume
*/
public void xaResume() throws XAException {
try {
if (LOGGER.isDebugEnabled()) {
LOGGER.logDebug("XAResource.start ( " + this.xidToHexString
+ " , XAResource.TMRESUME ) on resource "
+ this.resourcename
+ " represented by XAResource instance "
+ this.xaresource);
}
this.xaresource.start(this.xid, XAResource.TMRESUME);
this.isXaSuspended = false;
} catch (XAException xaerr) {
String msg = interpretErrorCode(this.resourcename, "resume",
this.xid, xaerr.errorCode);
LOGGER.logWarning(msg, xaerr);
throw xaerr;
}
}
/**
* Test if the resource has been ended with TMSUSPEND.
*
* @return boolean True if so.
*/
public boolean isXaSuspended() {
return this.isXaSuspended;
}
/**
* Test if the restx is active (in use).
*
* @return boolean True if so.
*/
public boolean isActive() {
return this.state.equals(TxState.ACTIVE);
}
/**
* @see com.atomikos.icatch.Participant#getURI()
*/
@Override
public String getURI() {
return xid.getBranchQualifierAsString();
}
public String getResourceName() {
return this.resourcename;
}
@Override
public boolean isRecoverable() {
return true;
}
}
