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/**
* Copyright (C) 2000-2017 Atomikos
*
* LICENSE CONDITIONS
*
* See http://www.atomikos.com/Main/WhichLicenseApplies for details.
*/
package com.atomikos.jdbc.nonxa;
import java.lang.reflect.Method;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Set;
import com.atomikos.beans.PropertyUtils;
import com.atomikos.datasource.pool.Reapable;
import com.atomikos.datasource.pool.XPooledConnectionEventListener;
import com.atomikos.icatch.CompositeTransaction;
import com.atomikos.icatch.CompositeTransactionManager;
import com.atomikos.icatch.config.Configuration;
import com.atomikos.icatch.jta.TransactionManagerImp;
import com.atomikos.jdbc.AbstractConnectionProxy;
import com.atomikos.jdbc.AtomikosSQLException;
import com.atomikos.jdbc.JdbcConnectionProxyHelper;
import com.atomikos.logging.Logger;
import com.atomikos.logging.LoggerFactory;
import com.atomikos.util.ClassLoadingHelper;
import com.atomikos.util.DynamicProxy;
/**
*
*
*
* A dynamic proxy class that wraps JDBC local connections to enable them for
* JTA transactions and the J2EE programming model: different modules in the
* same thread (and transaction) can get a connection from the datasource, and
* rollback will undo all that work.
*
* This proxy also maintains state on behalf of the application/transaction;
* the underlying connection can be re-pooled if two conditions evaluate to true:
*
*
There is no pending SQL work in a pending transaction; i.e. all SQL has been committed or rolled back.
*
There are no pending close() calls, i.e. no further SQL will arrive on the application's behalf.
*
*
*/
class AtomikosThreadLocalConnection extends AbstractConnectionProxy
implements JtaAwareNonXaConnection
{
private static final Logger LOGGER = LoggerFactory.createLogger(AtomikosThreadLocalConnection.class);
private final static List ENLISTMENT_METHODS = Arrays.asList(new String[] {"createStatement", "prepareStatement", "prepareCall"});
private final static List CLOSE_METHODS = Arrays.asList(new String[] {"close"});
private final static List XA_INCOMPATIBLE_METHODS = Arrays.asList(new String[] {"commit", "rollback", "setSavepoint", "releaseSavepoint"});
private final static List NON_TRANSACTIONAL_METHOD_NAMES = Arrays.asList(new String[] {
"equals",
"hashCode",
"notify",
"notifyAll",
"toString",
"wait"
});
private static Class[] MINIMUM_SET_OF_INTERFACES = {Reapable.class, DynamicProxy.class, java.sql.Connection.class };
private int useCount;
private CompositeTransaction transaction;
private boolean stale;
private AtomikosNonXAPooledConnection pooledConnection;
private Connection wrapped;
private boolean originalAutoCommitState;
private AtomikosNonXAParticipant participant;
// the participant; kept here to add heuristic msgs to
// note: this will be null for non-transactional use!
private boolean readOnly;
private String resourceName;
static Object newInstance ( AtomikosNonXAPooledConnection pooledConnection , String resourceName )
{
Object ret = null;
Object obj = pooledConnection.getConnection();
Set> interfaces = PropertyUtils.getAllImplementedInterfaces ( obj.getClass() );
interfaces.add ( Reapable.class );
//see case 24532
interfaces.add ( DynamicProxy.class );
Class[] interfaceClasses = ( Class[] ) interfaces.toArray ( new Class[0] );
List classLoaders = new ArrayList();
classLoaders.add ( Thread.currentThread().getContextClassLoader() );
classLoaders.add ( obj.getClass().getClassLoader() );
classLoaders.add ( AtomikosThreadLocalConnection.class.getClassLoader() );
ret = ClassLoadingHelper.newProxyInstance ( classLoaders , MINIMUM_SET_OF_INTERFACES , interfaceClasses , new AtomikosThreadLocalConnection ( pooledConnection ) );
DynamicProxy dproxy = (DynamicProxy) ret;
AtomikosThreadLocalConnection c = (AtomikosThreadLocalConnection) dproxy.getInvocationHandler();
c.resourceName = resourceName;
return ret;
}
private AtomikosThreadLocalConnection ( AtomikosNonXAPooledConnection pooledConnection )
{
this.stale = false;
this.useCount = 0;
this.transaction = null;
this.pooledConnection = pooledConnection;
this.wrapped = pooledConnection.getConnection();
this.readOnly = pooledConnection.getReadOnly();
}
private void setStale ()
{
this.stale = true;
}
private void resetForNextTransaction ()
{
try {
if ( LOGGER.isDebugEnabled() ) LOGGER.logDebug ( this + ": resetting autoCommit to " + originalAutoCommitState );
//see case 24567
wrapped.setAutoCommit ( originalAutoCommitState );
}catch ( Exception ex ){
LOGGER.logError ( "Failed to reset original autoCommit state: "+ex.getMessage(), ex);
}
setTransaction ( null );
participant = null;
}
boolean isStale ()
{
return stale;
}
private void decUseCount ()
{
useCount--;
markForReuseIfPossible ();
}
public void incUseCount ()
{
useCount++;
}
private void setTransaction ( CompositeTransaction tx )
{
this.transaction = tx;
}
private void updateInTransaction () throws SQLException
{
CompositeTransactionManager ctm = Configuration.getCompositeTransactionManager ();
if ( ctm == null )
return;
CompositeTransaction ct = ctm.getCompositeTransaction ();
if ( ct != null && ct.getProperty ( TransactionManagerImp.JTA_PROPERTY_NAME ) != null ) {
// if we are already in another (parent) tx then reject this,
// because nested tx rollback can not be supported!!!
if ( isInTransaction () && !isInTransaction ( ct ) )
AtomikosSQLException.throwAtomikosSQLException (
"Connection accessed by transaction "
+ ct.getTid ()
+ " is already in use in another transaction: "
+ transaction.getTid ()
+ " Non-XA connections are not compatible with nested transaction use." );
setTransaction ( ct );
if ( participant == null ) {
// make sure we add a participant for commit/rollback
// notifications
participant = new AtomikosNonXAParticipant ( this , resourceName );
participant.setReadOnly ( readOnly );
ct.addParticipant ( participant );
originalAutoCommitState = wrapped.getAutoCommit();
wrapped.setAutoCommit ( false );
}
} else {
// the current thread has NO tx, which means none was started (OK)
// or
// the previous one was terminated by the application. In that case,
// check that there was no ACTIVE rollback on timeout (meaning that
// transactionTerminated was never called!!!)
if ( isInTransaction () )
transactionTerminated ( false );
}
}
public Object invoke ( Object o , Method m , Object[] args )
throws Throwable
{
final String methodName = m.getName();
//see case 24532
if ( methodName.equals ( "getInvocationHandler" ) ) return this;
if (methodName.equals("reap")) {
if ( LOGGER.isDebugEnabled() ) LOGGER.logDebug ( this + ": reap()..." );
reap();
if ( LOGGER.isTraceEnabled() ) LOGGER.logTrace ( this + ": reap done." );
return null;
}
else if ( methodName.equals ("isNoLongerInUse") ) {
return Boolean.valueOf ( isNoLongerInUse() );
}
else if ( methodName.equals ("isInTransaction") ) {
return m.invoke( this , args);
}
else if (methodName.equals("isClosed")) {
if ( LOGGER.isDebugEnabled() ) LOGGER.logDebug ( this + ": isClosed()..." );
Object ret = Boolean.valueOf ( isStale() );
if ( LOGGER.isTraceEnabled() ) LOGGER.logTrace ( this + ": isClosed() returning " + ret );
return ret;
}
// detect illegal use after connection was resubmitted to the pool
else if ( isStale () && !NON_TRANSACTIONAL_METHOD_NAMES.contains ( methodName ) ) {
if (!methodName.equals("close"))
AtomikosSQLException.throwAtomikosSQLException ( "Attempt to use connection after it was closed." );
}
// disallow local TX methods in global TX context
else if ( isInTransaction() ) {
if (XA_INCOMPATIBLE_METHODS.contains(methodName))
AtomikosSQLException.throwAtomikosSQLException("Cannot call method '" + methodName + "' while a global transaction is running");
if (methodName.equals("setAutoCommit") && args[0].equals(Boolean.TRUE)) {
AtomikosSQLException.throwAtomikosSQLException("Cannot call 'setAutoCommit(true)' while a global transaction is running");
}
if (methodName.equals("getAutoCommit")) {
if ( LOGGER.isDebugEnabled() ) LOGGER.logDebug ( this + ": getAutoCommit()..." );
Object ret = Boolean.FALSE;
if ( LOGGER.isTraceEnabled() ) LOGGER.logTrace ( this + ": getAutoCommit() returning false." );
return ret;
}
CompositeTransactionManager ctm = Configuration.getCompositeTransactionManager ();
CompositeTransaction ct = ctm.getCompositeTransaction();
// if we are already in another (parent) tx then reject this,
// because nested tx rollback can not be supported!!!
if ( ct != null && !isInTransaction ( ct ) )
AtomikosSQLException.throwAtomikosSQLException (
"Connection accessed by transaction "
+ ct.getTid ()
+ " is already in use in another transaction: "
+ transaction.getTid ()
+ " Non-XA connections are not compatible with nested transaction use." );
}
// check for enlistment
else if (ENLISTMENT_METHODS.contains(methodName)) {
updateInTransaction();
}
Object ret = null;
// check for delistment
if (CLOSE_METHODS.contains(methodName)) {
if ( LOGGER.isDebugEnabled() ) LOGGER.logDebug ( this + ": close..." );
decUseCount();
if ( LOGGER.isTraceEnabled() ) LOGGER.logTrace ( this + ": close done." );
return null;
}
else {
try {
if ( LOGGER.isDebugEnabled() ) LOGGER.logDebug ( this + ": calling " + methodName + " on vendor connection..." );
ret = m.invoke ( wrapped , args);
} catch (Exception ex) {
pooledConnection.setErroneous();
JdbcConnectionProxyHelper.convertProxyError ( ex , "Error delegating '" + methodName + "' call" );
}
}
if ( LOGGER.isTraceEnabled() ) LOGGER.logTrace ( this + ": " + methodName + " returning " + ret );
if ( ret instanceof Statement ) {
Statement s = ( Statement ) ret;
addStatement ( s );
}
return ret;
}
/**
* Checks if the connection is being used on behalf the a transaction.
*
* @return
*/
boolean isInTransaction()
{
return transaction != null;
}
/**
* Checks if the connection is being used on behalf of the given transaction.
*
* @param ct
* @return
*/
boolean isInTransaction ( CompositeTransaction ct )
{
boolean ret = false;
//See case 29060 and 28683 :COPY attribute to avoid race conditions with NPE results
CompositeTransaction tx = transaction;
if ( tx != null && ct != null ) {
ret = tx.isSameTransaction ( ct );
}
return ret;
}
//can the underlying connection be pooled again?
boolean isNoLongerInUse()
{
return useCount <= 0 && !isInTransaction();
}
private void markForReuseIfPossible ()
{
if ( isNoLongerInUse() ) {
LOGGER
.logTrace ( "ThreadLocalConnection: detected reusability" );
setStale();
pooledConnection.fireOnXPooledConnectionTerminated();
} else {
if ( LOGGER.isTraceEnabled() ) LOGGER.logTrace ( "ThreadLocalConnection: not reusable yet" );
}
}
private void reap() {
LOGGER.logWarning ( this + ": reaping - check if the application closes connections correctly, or increase the reapTimeout value");
setStale();
useCount =0;
markForReuseIfPossible();
//added for BugzID 22101
pooledConnection.setErroneous();
forceCloseAllPendingStatements ( true );
}
//notification of transaction termination
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...");
wrapped.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" );
if ( LOGGER.isDebugEnabled() ) LOGGER.logDebug ( this + ": rolling back on connection...");
wrapped.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!
}
}
public void registerXPooledConnectionEventListener ( XPooledConnectionEventListener l )
{
pooledConnection.registerXPooledConnectionEventListener ( l );
}
public String toString()
{
StringBuffer ret = new StringBuffer();
ret.append ( "atomikos non-xa connection proxy for ");
ret.append(wrapped);
return ret.toString();
}
}
