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/**
* Copyright (C) 2000-2010 Atomikos
*
* 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.icatch.jta;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.rmi.RemoteException;
import java.util.Hashtable;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.naming.RefAddr;
import javax.naming.Reference;
import javax.naming.Referenceable;
import javax.naming.StringRefAddr;
import javax.rmi.PortableRemoteObject;
import javax.transaction.NotSupportedException;
import javax.transaction.Status;
import javax.transaction.SystemException;
import javax.transaction.Transaction;
import javax.transaction.TransactionManager;
import javax.transaction.UserTransaction;
import com.atomikos.logging.Logger;
import com.atomikos.logging.LoggerFactory;
/**
*
*
* An implementation of a (remote) client's user transaction.
* Client applications can use the result to control
* transaction demarcation, and even pass their instance to other VMs so that
* those can share the same transaction context. The server-side applications
* can use the toString() method to obtain the transaction identifier of the
* transaction represented by an instance. This way, an incoming call from a
* client that demarcates its own transactions only has to ship the
* UserTransaction to the server (or to other clients) to identify what
* transaction it is in.
*
* NOTE: remote clients that use instances of this class can do transaction
* demarcation, but they can not do nested transactions!
*
* NOTE: instances that are meant to be bound in JNDI should be bound without
* any transaction context (i.e., without calling begin() first).
*/
public final class RemoteClientUserTransaction implements UserTransaction,
Externalizable, Referenceable
{
private static final Logger LOGGER = LoggerFactory.createLogger(RemoteClientUserTransaction.class);
static final int DEFAULT_TIMEOUT = 30;
private transient UserTransactionServer txmgrServer_;
// not null if used outside server VM
private transient TransactionManager txmgr_;
// not null if used in server VM
private transient Hashtable threadToTidMap_;
private int timeout_;
private String name_;
// the RMI name to lookup the remote server.
private String initialContextFactory_;
private String providerUrl_;
private boolean imported_;
// if true: no commit/rollback allowed
// this is the case for instances that are
// passed on between remote clients
// Only the client that begins the tx
// may commit/abort it.
/**
* No-argument constructor, as required by Externalizable interface.
*/
public RemoteClientUserTransaction ()
{
threadToTidMap_ = new Hashtable ();
timeout_ = DEFAULT_TIMEOUT;
imported_ = false;
}
/**
* Preferred constructor.
*
* @param name
* The unique name of the UserTransactionServer.
* @param initialContextFactory
* The initial context factory of the server JNDI
* context.
* @param providerUrl
* The provider URL of the server JNDI context.
*/
public RemoteClientUserTransaction ( String name ,
String initialContextFactory , String providerUrl )
{
initialContextFactory_ = initialContextFactory;
providerUrl_ = providerUrl;
name_ = name;
threadToTidMap_ = new Hashtable ();
timeout_ = DEFAULT_TIMEOUT;
imported_ = false;
}
private String getNotFoundMessage ()
{
String errorMsg = "Name not found: "
+ name_
+ "\n"
+ "Please check that: \n"
+ " -server property com.atomikos.icatch.client_demarcation is set to true \n"
+ " -server property com.atomikos.icatch.rmi_export_class is correct \n"
+ " -server property java.naming.factory.initial is "
+ initialContextFactory_ + "\n"
+ " -server property java.naming.provider.url is "
+ providerUrl_ + "\n"
+ " -the naming service is running on port " + providerUrl_
+ "\n" + " -the transaction server is running";
return errorMsg;
}
/**
* Referenceable mechanism requires later setup of txmgr_, otherwise binding
* into JNDI already requires that TM is running.
*
* @return boolean True if running in server VM, false if remote.
*/
private boolean checkSetup ()
{
// first try to get intra-VM txmgr
txmgr_ = TransactionManagerImp.getTransactionManager ();
// if no intra-VM tm: use remote tm
if ( txmgr_ == null ) {
try {
Hashtable env = new Hashtable ();
env.put ( Context.INITIAL_CONTEXT_FACTORY,
initialContextFactory_ );
env.put ( Context.PROVIDER_URL, providerUrl_ );
Context ctx = new InitialContext ( env );
txmgrServer_ = (UserTransactionServer) PortableRemoteObject
.narrow ( ctx.lookup ( name_ ),
UserTransactionServer.class );
} catch ( Exception e ) {
e.printStackTrace ();
throw new RuntimeException ( getNotFoundMessage () );
}
if ( txmgrServer_ == null )
throw new RuntimeException ( getNotFoundMessage () );
}
return txmgr_ != null;
}
private synchronized void setThreadMapping ( String tid )
{
Thread thread = Thread.currentThread ();
threadToTidMap_.put ( thread, tid );
}
private synchronized String removeThreadMapping ()
{
Thread thread = Thread.currentThread ();
return (String) threadToTidMap_.remove ( thread );
}
private synchronized String getThreadMapping ()
{
Thread thread = Thread.currentThread ();
return (String) threadToTidMap_.get ( thread );
}
/**
* @see javax.transaction.UserTransaction
*/
public void begin () throws NotSupportedException, SystemException
{
boolean local = checkSetup ();
if ( local )
txmgr_.begin ();
else {
String tid = getThreadMapping ();
if ( tid != null ) {
// error: no nested txs supported
throw new NotSupportedException (
"Nested transaction not allowed here" );
}
try {
tid = txmgrServer_.begin ( timeout_ );
} catch ( RemoteException re ) {
throw new SystemException ( re.getMessage () );
}
setThreadMapping ( tid );
}
}
/**
* @see javax.transaction.UserTransaction
*/
public void commit () throws javax.transaction.RollbackException,
javax.transaction.HeuristicMixedException,
javax.transaction.HeuristicRollbackException,
javax.transaction.SystemException, java.lang.IllegalStateException,
java.lang.SecurityException
{
boolean local = checkSetup ();
if ( local )
txmgr_.commit ();
else {
if ( imported_ )
throw new SecurityException ( "Commit not allowed: not creator" );
String tid = removeThreadMapping ();
if ( tid == null )
throw new IllegalStateException ( "No transaction for thread" );
try {
txmgrServer_.commit ( tid );
} catch ( RemoteException re ) {
throw new SystemException ( re.getMessage () );
}
}
}
/**
* @see javax.transaction.UserTransaction
*/
public void rollback () throws IllegalStateException, SystemException,
SecurityException
{
boolean local = checkSetup ();
if ( local )
txmgr_.rollback ();
else {
if ( imported_ )
throw new SecurityException (
"Rollback not allowed: not creator" );
String tid = removeThreadMapping ();
if ( tid == null )
throw new IllegalStateException ( "No transaction for thread" );
try {
txmgrServer_.rollback ( tid );
} catch ( RemoteException re ) {
throw new SystemException ( re.getMessage () );
}
}
}
/**
* @see javax.transaction.UserTransaction
*/
public void setRollbackOnly () throws IllegalStateException,
SystemException
{
boolean local = checkSetup ();
if ( local )
txmgr_.setRollbackOnly ();
else {
String tid = getThreadMapping ();
if ( tid == null )
throw new IllegalStateException ( "No transaction for thread" );
try {
txmgrServer_.setRollbackOnly ( tid );
} catch ( RemoteException re ) {
throw new SystemException ( re.getMessage () );
}
}
}
/**
* @see javax.transaction.UserTransaction
*/
public int getStatus () throws SystemException
{
int ret = Status.STATUS_NO_TRANSACTION;
boolean local = checkSetup ();
if ( local )
ret = txmgr_.getStatus ();
else {
String tid = getThreadMapping ();
if ( tid != null ) {
try {
ret = txmgrServer_.getStatus ( tid );
} catch ( RemoteException re ) {
throw new SystemException ( re.getMessage () );
}
}
}
return ret;
}
/**
* @see javax.transaction.UserTransaction
*/
public void setTransactionTimeout ( int seconds ) throws SystemException
{
timeout_ = seconds;
}
/**
* Overrides the default behaviour, to allow retrieving the corresponding
* transaction at the server side.
*
* @return String The transaction ID (tid) of the transaction for which the
* thread is executing. Null if no transaction.
*/
public String toString ()
{
String ret = null;
boolean local = checkSetup ();
if ( local ) {
Transaction tx = null;
try {
tx = txmgr_.getTransaction ();
} catch ( SystemException e ) {
String msg = "Error getting transaction";
LOGGER.logWarning ( msg, e );
}
if ( tx != null )
ret = tx.toString ();
}
// happens if not local, OR:
// if local, but no tx found for thread
// this occurs for an imported instance
// from a remote client!!!
if ( ret == null )
ret = getThreadMapping ();
return ret;
}
//
//
// IMPLEMENTATION OF REFERENCEABLE
//
//
/**
* @see Referenceable
*/
public Reference getReference () throws NamingException
{
RefAddr nameRef = new StringRefAddr ( "ServerName", name_ );
RefAddr urlRef = new StringRefAddr ( "ProviderUrl", providerUrl_ );
RefAddr factRef = new StringRefAddr ( "ContextFactory",
initialContextFactory_ );
RefAddr timeoutRef = new StringRefAddr ( "Timeout", new Integer (
timeout_ ).toString () );
Reference ref = new Reference ( getClass ().getName (),
new StringRefAddr ( "name", "RemoteClientUserTransaction" ),
RemoteClientUserTransactionFactory.class.getName (), null );
ref.add ( nameRef );
ref.add ( urlRef );
ref.add ( factRef );
ref.add ( timeoutRef );
return ref;
}
//
//
// IMPLEMENTATION OF EXTERNALIZABLE
//
//
/**
* @see Externalizable
*/
public void writeExternal ( ObjectOutput out ) throws IOException
{
// Implement two-fold behaviour:
// if thread not currently associated with a tx
// then write null;
// else write the current TID in order
// to ship context among remote clients.
String tid = getThreadMapping ();
out.writeObject ( tid );
out.writeObject ( name_ );
out.writeObject ( initialContextFactory_ );
out.writeObject ( providerUrl_ );
out.writeInt ( timeout_ );
}
/**
* @see Externalizable
*/
public void readExternal ( ObjectInput in ) throws IOException,
ClassNotFoundException
{
// Try if a tid is there;
// if yes then this means that the streaming out
// was done for a transaction context;
// hence restore that context
String tid = (String) in.readObject ();
if ( tid != null ) {
setThreadMapping ( tid );
imported_ = true;
// this will mark the instance to not
// allow commit/rollback
}
name_ = (String) in.readObject ();
initialContextFactory_ = (String) in.readObject ();
providerUrl_ = (String) in.readObject ();
timeout_ = in.readInt ();
}
}
