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package org.glassfish.weld.services;

import static javax.transaction.Status.STATUS_ACTIVE;

import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.transaction.Synchronization;
import javax.transaction.SystemException;
import javax.transaction.UserTransaction;

import org.jvnet.hk2.component.Habitat;
import com.sun.enterprise.transaction.api.JavaEETransactionManager;
import org.jboss.weld.transaction.spi.TransactionServices;

public class TransactionServicesImpl implements TransactionServices {

    private JavaEETransactionManager transactionManager = null;

    public TransactionServicesImpl(Habitat habitat) {
        transactionManager = habitat.getByContract(JavaEETransactionManager.class);
        if (transactionManager == null) {
            throw new RuntimeException("Unable to retrieve transaction mgr.");
        }
    }

    public boolean isTransactionActive() {
        try {
            return transactionManager.getStatus() == STATUS_ACTIVE;
        } catch (SystemException e) {
            throw new RuntimeException("Unable to determine transaction status", e);
        }
    }

    public void registerSynchronization(Synchronization observer) {
        try {
            transactionManager.registerSynchronization(observer);
        } catch (Exception e) {
            throw new RuntimeException("Unable to register synchronization " + observer + 
            " for current transaction", e);
        }
    }

    public UserTransaction getUserTransaction() {
        try {
            InitialContext c = new InitialContext();
            UserTransaction ut = (UserTransaction)c.lookup("java:comp/UserTransaction");
            return ut;
        } catch (NamingException e) {
            return null;
        }
    }

    public void cleanup() {}
}