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package com.sun.enterprise.resource;
import javax.transaction.*;
import javax.resource.spi.ManagedConnection;
import java.util.logging.Level;
import java.util.List;
import com.sun.enterprise.distributedtx.J2EETransactionManagerImpl;
import com.sun.enterprise.J2EETransactionManager;
import com.sun.enterprise.Switch;
import javax.resource.ResourceException;
import com.sun.enterprise.PoolManager;
import com.sun.enterprise.ComponentInvocation;
import java.util.ListIterator;
/**
* This class is used for lazy enlistment of a resource
*
* @author Aditya Gore
*/
public class LazyEnlistableResourceManagerImpl extends ResourceManagerImpl {
protected void enlist( J2EETransactionManager tm, Transaction tran,
ResourceHandle h ){
//do nothing
}
/**
* Overridden to suspend lazyenlistment.
* @param handle
* @throws PoolingException
*/
public void registerResource(ResourceHandle handle)
throws PoolingException {
handle.setEnlistmentSuspended(true);
super.registerResource(handle);
}
/**
* This is called by the PoolManager (in turn by the LazyEnlistableConnectionManager)
* when a lazy enlistment is sought.
* @param mc ManagedConnection
* @throws ResourceException
*/
public void lazyEnlist( ManagedConnection mc ) throws ResourceException {
if ( _logger.isLoggable(Level.FINE) ) {
_logger.fine("Entering lazyEnlist");
}
J2EETransactionManager tm = Switch.getSwitch().getTransactionManager();
Transaction tran = null;
try {
tran = tm.getTransaction();
if ( tran == null ) {
if (_logger.isLoggable(Level.FINE)) {
_logger.fine(" Transaction null - not enlisting ");
}
return;
}
} catch( SystemException se ) {
ResourceException re = new ResourceException( se.getMessage() );
re.initCause( se );
throw re;
}
List invList = Switch.getSwitch().getInvocationManager().getAllInvocations();
ResourceHandle h = null;
for ( int j = invList.size(); j > 0; j-- ) {
ComponentInvocation inv = (ComponentInvocation) invList.get( j - 1 );
Object comp = inv.getInstance();
List l = ((J2EETransactionManagerImpl)tm).getResourceList( comp, inv );
ListIterator it = l.listIterator();
while( it.hasNext()) {
ResourceHandle hand = (ResourceHandle) it.next();
ManagedConnection toEnlist = (ManagedConnection) hand.getResource();
if ( mc.equals( toEnlist ) ) {
h = hand;
break;
}
}
}
//NOTE: Notice that here we are always assuming that the connection we
//are trying to enlist was acquired in this component only. This
//might be inadequate in situations where component A acquires a connection
//and passes it on to a method of component B, and the lazyEnlist is
//triggered in B
//At this point however, we will only support the straight and narrow
//case where a connection is acquired and then used in the same component.
//The other case might or might not work
if( h != null && h.getResourceState().isUnenlisted()) {
try {
//Enable the suspended lazyenlistment so as to enlist the resource.
h.setEnlistmentSuspended(false);
tm.enlistResource( tran, h );
//Suspend it back
h.setEnlistmentSuspended(true);
} catch( Exception e ) {
//In the rare cases where enlistResource throws exception, we
//should return the resource to the pool
PoolManager mgr = Switch.getSwitch().getPoolManager();
mgr.putbackDirectToPool( h, h.getResourceSpec().getConnectionPoolName());
_logger.log(Level.WARNING, "poolmgr.err_enlisting_res_in_getconn");
if (_logger.isLoggable(Level.FINE) ) {
_logger.fine("rm.enlistResource threw Exception. Returning resource to pool");
}
//and rethrow the exception
throw new ResourceException( e );
}
}
}
}