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package com.sun.enterprise.jbi.serviceengine.handlers;

import com.sun.enterprise.Switch;
import com.sun.enterprise.jbi.serviceengine.comm.MessageExchangeTransport;

import javax.jbi.messaging.MessageExchange;
import javax.jbi.messaging.ExchangeStatus;
import javax.jbi.messaging.InOnly;
import javax.transaction.SystemException;
import javax.transaction.TransactionManager;
import javax.transaction.Transaction;
import javax.transaction.InvalidTransactionException;

/**
 * Transaction handling for JBI message exchanges is done in this class. It has
 * a singleton instance.
 * 
 * @author Vikas Awasthi
 */
public class JBITransactionHandler implements JBIHandler {

    public void handleInbound(MessageExchangeTransport meTransport) throws Exception {
        MessageExchange me = meTransport.getMessageExchange();
        if(!isTxEnabled(me))
            return;

        suspendTx(me);
    }

    public void handleOutbound(MessageExchangeTransport meTransport) throws Exception {
        MessageExchange me = meTransport.getMessageExchange();
        if(!isTxEnabled(me))
            return;

        resumeTx(me);
    }

    protected boolean isTxEnabled(MessageExchange me) {
        return ((tx_enable==null || tx_enable.equalsIgnoreCase("true")));
    }
    
    private void suspendTx(MessageExchange me) throws SystemException {

        TransactionManager tm = getTM();
        Transaction tx = tm.getTransaction();

        if (tx != null) {
            if(me.getStatus().equals(ExchangeStatus.ERROR))
                tx.setRollbackOnly();
            tx = tm.suspend();
            me.setProperty(MessageExchange.JTA_TRANSACTION_PROPERTY_NAME, tx);
        }
    }

    private void resumeTx(MessageExchange me) throws
            SystemException,
            InvalidTransactionException {

        TransactionManager tm = getTM();
        Transaction tx = (Transaction)me.getProperty(MessageExchange.JTA_TRANSACTION_PROPERTY_NAME);

        if(tx != null) {
            if(me.getStatus().equals(ExchangeStatus.ERROR))
                tx.setRollbackOnly();
            tm.resume(tx);
        }
    }

    private TransactionManager getTM() {
        return Switch.getSwitch().getTransactionManager();
    }
    
    private String tx_enable = System.getProperty("com.sun.enterprise.jbi.tx.enable");
}