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/*
* Copyright 2000-2008, Atomikos (http://www.atomikos.com)
*
* This code ("Atomikos TransactionsEssentials"), by itself,
* is being distributed under the
* Apache License, Version 2.0 ("License"), a copy of which may be found at
* http://www.atomikos.com/licenses/apache-license-2.0.txt .
* You may not use this file except in compliance with the License.
*
* While the License grants certain patent license rights,
* those patent license rights only extend to the use of
* Atomikos TransactionsEssentials by itself.
*
* This code (Atomikos TransactionsEssentials) contains certain interfaces
* in package (namespace) com.atomikos.icatch
* (including com.atomikos.icatch.Participant) which, if implemented, may
* infringe one or more patents held by Atomikos.
* It should be appreciated that you may NOT implement such interfaces;
* licensing to implement these interfaces must be obtained separately from Atomikos.
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*
*/
package com.atomikos.jdbc;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import com.atomikos.datasource.TransactionalResource;
import com.atomikos.datasource.xa.XAResourceTransaction;
import com.atomikos.icatch.CompositeTransaction;
import com.atomikos.icatch.CompositeTransactionManager;
import com.atomikos.icatch.jta.TransactionManagerImp;
import com.atomikos.icatch.system.Configuration;
/**
*
*
*
*
*
* A dynamic proxy to allow external pooling, and also to allow late enlisting
* of resources with transactions.
*/
class ConnectionProxy implements InvocationHandler
{
private final static List NON_TRANSACTIONAL_METHOD_NAMES = Arrays.asList(new String[] {
"equals",
"hashCode",
"notify",
"notifyAll",
"toString",
"wait"
});
static Set getAllImplementedInterfaces ( Class clazz )
{
Set ret = null;
if ( clazz.getSuperclass() != null ) {
//if superclass exists: first add the superclass interfaces!!!
ret = getAllImplementedInterfaces ( clazz.getSuperclass() );
}
else {
//no superclass: start with empty set
ret = new HashSet();
}
//add the interfaces in this class
Class[] interfaces = clazz.getInterfaces();
for ( int i = 0 ; i < interfaces.length ; i++ ) {
ret.add ( interfaces[i] );
}
return ret;
}
static Object newInstance ( DTPPooledConnection pc , java.sql.Connection c ,
TransactionalResource resource ) throws SQLException
{
Object ret = null;
ConnectionProxy proxy = new ConnectionProxy ( c, resource, pc );
Set interfaces = getAllImplementedInterfaces ( c.getClass() );
Class[] interfaceClasses = ( Class[] ) interfaces.toArray ( new Class[0] );
ret = java.lang.reflect.Proxy.newProxyInstance ( c.getClass ()
.getClassLoader (), interfaceClasses, proxy );
return ret;
}
private Connection wrapped_;
private TransactionalResource resource_;
private DTPPooledConnection pc_;
private ConnectionProxy ( Connection wrapped ,
TransactionalResource resource , DTPPooledConnection pc )
{
wrapped_ = wrapped;
resource_ = resource;
pc_ = pc;
}
/**
* @see java.lang.reflect.InvocationHandler#invoke(java.lang.Object,
* java.lang.reflect.Method, java.lang.Object[])
*/
public Object invoke ( Object o , Method m , Object[] args )
throws Throwable
{
if (NON_TRANSACTIONAL_METHOD_NAMES.contains(m.getName())) {
Configuration.logDebug ("Calling non-transactional method '" + m.getName() + "' on connection proxy, bypassing enlistment");
return m.invoke ( wrapped_, args );
}
Object ret = null;
XAResourceTransaction restx = null;
CompositeTransaction ct = null;
CompositeTransactionManager ctm = null;
ctm = Configuration.getCompositeTransactionManager ();
boolean inTx = false;
// false if resume should be called (first invocation in tx)
if ( ctm != null )
ct = ctm.getCompositeTransaction ();
inTx = pc_.isInResourceTransaction ();
if ( ct != null && ct.getProperty ( TransactionManagerImp.JTA_PROPERTY_NAME ) != null && !pc_.isDiscarded () ) {
// only enlist if there is a NORMAL tx
// AND if the pc is not yet discarded (i.e. closed event
// without a new getConnection() event)
if ( !inTx ) {
// not yet enlisted
// IMPORTANT: we should enlist ONLY ONCE,
// since we don't have wrappers for each
// type of dependent object (statements,...)
// where the real action is
// Also, for the same reason we can only
// delist at close time, since that is the
// earliest detectable moment in time
// when all these dependent objects are no
// longer accessible.
// VITAL ASSERTION FOR THIS TO WORK:
// after close, the ResourceTransaction association
// of the pooled connection MUST be null, or the
// same restx will be reused in different
// JTA transactions!
restx = (XAResourceTransaction) resource_
.getResourceTransaction ( ct );
pc_.setResourceTransaction ( restx );
restx.resume ();
Configuration
.logDebug ( "JDBC ConnectionProxy: using resource transaction: "
+ restx.getXid () );
}
}
try {
Configuration.logDebug ( "JDBC ConnectionProxy: delegating "
+ m.getName () + " to connection " + wrapped_.toString () );
// if ("close".equals(m.getName())) {
//
// }
ret = m.invoke ( wrapped_, args );
} catch ( InvocationTargetException i ) {
pc_.setInvalidated ();
pc_.close ();
Configuration.logDebug (
"Exception in pooled connection - closing it", i );
AtomikosSQLException.throwAtomikosSQLException ( i.getMessage() , i );
} catch ( Exception e ) {
String msg = "Exception in pooled connection: unexpected error - closing it";
Configuration.logWarning ( msg, e );
pc_.setInvalidated ();
pc_.close ();
AtomikosSQLException.throwAtomikosSQLException ( e.getMessage() , e );
}
return ret;
}
}
