com.atomikos.jdbc.internal.JtaAwareThreadLocalConnection Maven / Gradle / Ivy
/**
* Copyright (C) 2000-2020 Atomikos
*
* LICENSE CONDITIONS
*
* See http://www.atomikos.com/Main/WhichLicenseApplies for details.
*/
package com.atomikos.jdbc.internal;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Savepoint;
import java.util.Stack;
import com.atomikos.icatch.CompositeTransaction;
import com.atomikos.icatch.CompositeTransactionManager;
import com.atomikos.icatch.SubTxAwareParticipant;
import com.atomikos.icatch.config.Configuration;
import com.atomikos.icatch.jta.TransactionManagerImp;
import com.atomikos.jdbc.internal.JdbcNonXAConnectionHandleState.ParticipantRegistrationRequiredException;
import com.atomikos.jdbc.internal.JdbcNonXAConnectionHandleState.ReadOnlyParticipantRegistrationRequiredException;
import com.atomikos.jdbc.internal.JdbcNonXAConnectionHandleState.SubTxAwareParticipantRegistrationRequiredException;
import com.atomikos.jdbc.internal.JdbcNonXAConnectionHandleState.TransactionContextException;
import com.atomikos.logging.Logger;
import com.atomikos.logging.LoggerFactory;
import com.atomikos.util.Proxied;
public class JtaAwareThreadLocalConnection extends AbstractJdbcConnectionProxy implements NonXaConnectionProxy {
private static final Logger LOGGER = LoggerFactory.createLogger(JtaAwareThreadLocalConnection.class);
private int useCount = 0;
private boolean stale;
private final AtomikosNonXAPooledConnection pooledConnection;
private boolean originalAutoCommitState;
private final String resourceName;
private final JdbcNonXAConnectionHandleState state;
public JtaAwareThreadLocalConnection(AtomikosNonXAPooledConnection pooledConnection, String resourceName) {
super(pooledConnection.getConnection());
this.pooledConnection = pooledConnection;
this.resourceName =resourceName;
this.state = new JdbcNonXAConnectionHandleState(pooledConnection.getReadOnly());
}
@Override
protected void updateTransactionContext() throws SQLException {
CompositeTransactionManager ctm = Configuration.getCompositeTransactionManager();
if (ctm == null ) {
return;
}
CompositeTransaction ct = ctm.getCompositeTransaction();
if (ct != null && TransactionManagerImp.isJtaTransaction(ct)) {
try {
state.notifyBeforeUse(ct);
} catch (ParticipantRegistrationRequiredException e) {
registerAsParticipantFor(ct);
} catch (ReadOnlyParticipantRegistrationRequiredException e) {
registerAsReadOnlyParticipantFor(ct);
} catch (SubTxAwareParticipantRegistrationRequiredException e) {
registerAsSubTxAwareParticipantFor(ct);
} catch (TransactionContextException e) {
AtomikosSQLException.throwAtomikosSQLException(e.getMessage(), e);
}
} else {
AtomikosSQLException.throwAtomikosSQLException("A JTA transaction is required but none was found - please start one first (or set localTransactionMode=true to allow JDBC transactions)");
}
}
public void transactionTerminated(boolean commit) throws SQLException {
// delegate commit or rollback to the underlying connection
try {
if (commit) {
if (LOGGER.isDebugEnabled()) {
LOGGER.logDebug(this + ": committing on connection...");
}
this.delegate.commit();
} else {
// see case 84252
forceCloseAllPendingStatements(false);
if (LOGGER.isDebugEnabled()) {
LOGGER.logDebug(this + ": transaction aborting - "
+ "pessimistically closing all pending statements to avoid autoCommit after timeout");
LOGGER.logDebug(this + ": rolling back on connection...");
}
this.delegate.rollback();
}
} catch (SQLException e) {
// make sure that reuse in pool is not possible
pooledConnection.setErroneous();
String msg = "Error in commit on vendor connection";
if (!commit) {
msg = "Error in rollback on vendor connection";
}
AtomikosSQLException.throwAtomikosSQLException(msg, e);
} finally {
// reset attributes for next tx
resetForNextTransaction();
// put connection in pool if no longer used
// note: if erroneous then the pool will destroy the connection (cf
// case 30752)
// which seems desirable to avoid pool exhaustion
markForReuseIfPossible();
// see case 30752: resetting autoCommit should not be done here:
// connection may have been reused already!
}
}
private void resetForNextTransaction() {
state.reset();
try {
if (LOGGER.isDebugEnabled()) {
LOGGER.logDebug(this + ": resetting autoCommit to " + originalAutoCommitState);
}
// see case 24567
this.delegate.setAutoCommit(originalAutoCommitState);
} catch (Exception ex) {
LOGGER.logError(this + ": failed to reset original autoCommit state: " + ex.getMessage(), ex);
}
}
/**
* Checks if the connection is being used on behalf of the given
* transaction.
*
* @param ct
* @return
*/
boolean isInTransaction(CompositeTransaction ct) {
return state.isEnlistedInGlobalTransaction(ct);
}
@Proxied
public void close() throws SQLException {
decUseCount();
//markClosed(); cf case 179080: don't mark as closed to allow reuse in same transaction
}
public void incUseCount() {
useCount++;
}
private void decUseCount() {
useCount--;
markForReuseIfPossible();
}
boolean isStale() {
return stale;
}
private void markForReuseIfPossible() {
if (isAvailableForReuseByPool()) {
LOGGER.logTrace(this + ": detected reusability");
setStale();
forceCloseAllPendingStatements(false);
pooledConnection.fireOnXPooledConnectionTerminated();
} else {
if (LOGGER.isTraceEnabled()) {
LOGGER.logTrace(this + ": not reusable yet");
}
}
}
private void setStale() {
this.stale = true;
}
public boolean isAvailableForReuseByPool() {
return useCount <= 0 && !isEnlistedInGlobalTransaction();
}
/**
* Checks if the connection is being used on behalf the a transaction.
*
* @return
*/
@Override
protected boolean isEnlistedInGlobalTransaction() {
return state.isEnlistedInGlobalTransaction();
}
@Override
protected void handleInvocationException(Throwable e) throws Throwable {
pooledConnection.setErroneous();
throw e;
}
@Override
public String toString() {
return "jtaAwareThreadLocalConnection (isAvailable = " + isAvailableForReuseByPool() + ") for vendor instance " + delegate;
}
private void registerAsParticipantFor(CompositeTransaction ct) throws SQLException {
originalAutoCommitState = this.delegate.getAutoCommit();
this.delegate.setAutoCommit(false);
AtomikosNonXAParticipant participant = new AtomikosNonXAParticipant(this, resourceName);
CompositeTransaction localRoot = findLocalRoot(ct);
localRoot.addParticipant(participant);
if (localRoot != ct) {
//first registration happens for a subtransaction => also deal with subtx rollback
registerAsSubTxAwareParticipantFor(ct);
}
}
private void registerAsReadOnlyParticipantFor(CompositeTransaction ct) throws SQLException {
originalAutoCommitState = this.delegate.getAutoCommit();
this.delegate.setAutoCommit(false);
CompositeTransaction localRoot = findLocalRoot(ct);
ReadOnlyParticipant participant = new ReadOnlyParticipant(this);
localRoot.addSubTxAwareParticipant(participant);
}
private void registerAsSubTxAwareParticipantFor(CompositeTransaction ct) throws SQLException {
boolean supportsSavepoints = false;
try {
supportsSavepoints = delegate.getMetaData().supportsSavepoints();
} catch (Error e) {
LOGGER.logDebug("Failed to determine savepoint support in JDBC driver - see stacktrace for details", e);
//ignore, continue without subtx support
}
if (!supportsSavepoints) {
state.subTransactionTerminated();
// no SubTxRollbackParticipant will be added so terminate here already to keep the transaction state clean
// note: next updateTransactionContext call will try and fail again but that is ok
AtomikosSQLException.throwAtomikosSQLException("You're trying to use nested transactions but the underlying JDBC driver does not support savepoints - which is required for this to work...");
}
SubTxParticipant participant = new SubTxParticipant(ct.getTid(), this);
ct.addSubTxAwareParticipant(participant);
}
private CompositeTransaction findLocalRoot(CompositeTransaction ct) {
CompositeTransaction ret = ct;
Stack parents = ct.getLineage();
if (parents != null) {
Stack parentsClone = (Stack) parents.clone();
while (!parentsClone.isEmpty()) {
CompositeTransaction parent = parentsClone.pop();
if (parent.isLocal()) {
ret = parent;
}
}
}
return ret;
}
private static class SubTxParticipant implements SubTxAwareParticipant {
private Savepoint savepoint;
private JtaAwareThreadLocalConnection owner;
SubTxParticipant(String tid, JtaAwareThreadLocalConnection owner) throws SQLException {
this.owner = owner;
this.savepoint = owner.delegate.setSavepoint(tid);
}
@Override
public void committed(CompositeTransaction transaction) {
owner.state.subTransactionTerminated();
}
@Override
public void rolledback(CompositeTransaction transaction) {
owner.state.subTransactionTerminated();
try {
owner.delegate.rollback(savepoint);
} catch (SQLException e) {
LOGGER.logWarning("Failed to rollback to savepoint", e);
owner.pooledConnection.setErroneous();
}
}
@Override
public boolean equals(Object o) {
boolean ret = false;
if (o instanceof SubTxParticipant) {
SubTxParticipant other = (SubTxParticipant) o;
ret = owner == other.owner;
}
return ret;
}
@Override
public int hashCode() {
return owner.hashCode();
}
}
private static class ReadOnlyParticipant implements SubTxAwareParticipant {
JtaAwareThreadLocalConnection owner;
ReadOnlyParticipant(JtaAwareThreadLocalConnection owner) {
this.owner = owner;
}
@Override
public void rolledback(CompositeTransaction transaction) {
try {
owner.transactionTerminated(false);
} catch (SQLException e) {
LOGGER.logWarning("Unexpected error during rollback", e);
}
}
@Override
public void committed(CompositeTransaction transaction) {
try {
owner.transactionTerminated(true);
} catch (SQLException e) {
LOGGER.logWarning("Unexpected error during commit", e);
}
}
@Override
public boolean equals(Object o) {
boolean ret = false;
if (o instanceof ReadOnlyParticipant) {
ReadOnlyParticipant other = (ReadOnlyParticipant) o;
ret = owner == other.owner;
}
return ret;
}
@Override
public int hashCode() {
return owner.hashCode();
}
}
@Override
protected Class getRequiredInterfaceType() {
return Connection.class;
}
}