/*
   Copyright 2013 Nationale-Nederlanden

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   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.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
package nl.nn.adapterframework.extensions.ifsa.ejb;

import com.ing.ifsa.api.FireForgetService;
import com.ing.ifsa.api.RequestReplyService;
import com.ing.ifsa.internal.exceptions.InvalidServiceException;
import com.ing.ifsa.internal.exceptions.UnknownServiceException;
import com.ing.ifsa.provider.ServiceLocatorEJB;
import com.ing.ifsa.utils.NamingHelper;
import java.lang.reflect.Method;
import javax.ejb.EJBHome;
import javax.naming.NameNotFoundException;
import javax.naming.NamingException;
import javax.rmi.PortableRemoteObject;
import nl.nn.adapterframework.util.LogUtil;
import org.apache.log4j.Logger;

/**
 * Override the IFSA SeriveLocatorEJB implementation to return the IBIS
 * Service Dispatcher session bean for all IFSA service URLs.
 * 
 * @author Tim van der Leeuw
 */
public class CustomIfsaServiceLocatorEJB extends ServiceLocatorEJB {
    private final static Logger log = LogUtil.getLogger(CustomIfsaServiceLocatorEJB.class);
    
    public final static String SERVICE_DISPATCHER_EJB_NAME = "java:comp/env/ejb/ibis/ServiceDispatcher";
    protected final NamingHelper namingHelper = new NamingHelper();
    
    public FireForgetService getFireForgetService(String service) throws UnknownServiceException, InvalidServiceException {
        try {
            return super.getFireForgetService(service);
        } catch (UnknownServiceException e) {
            log.warn("Can not find EJB Bean for FF service [" + service + "], will look up generic FF service dispatcher EJB; original excpetion message: " + e.getMessage());
            FireForgetService serviceDispatcherBean = (FireForgetService) getBeanFromJNDI(SERVICE_DISPATCHER_EJB_NAME);
            log.debug("Service [" + service + "] will be handled by generic FF service dispatcher bean [" + serviceDispatcherBean.toString() + "]");
            return serviceDispatcherBean;
        }
    }

    public RequestReplyService getRequestReplyService(String service) throws UnknownServiceException, InvalidServiceException {
        try {
            return super.getRequestReplyService(service);
        } catch (UnknownServiceException e) {
            log.warn("Can not find EJB Bean for RR service [" + service + "], will look up generic RR service dispatcher EJB; original excpetion message: " + e.getMessage());
            RequestReplyService serviceDispatcherBean = (RequestReplyService) getBeanFromJNDI(SERVICE_DISPATCHER_EJB_NAME);
            log.debug("Service [" + service + "] will be handled by generic RR service dispatcher bean [" + serviceDispatcherBean.toString() + "]");
            return serviceDispatcherBean;
        }
    }
    
    protected Object getBeanFromJNDI(String beanHomeJNDIName) throws UnknownServiceException, InvalidServiceException {
        try {
            Object obj = namingHelper.lookup(beanHomeJNDIName);
            EJBHome svcHome = (EJBHome) PortableRemoteObject.narrow(obj, javax.ejb.EJBHome.class);
            
            Class homeClass = svcHome.getClass();
            Method createMethod = homeClass.getMethod("create", null);
            Object remoteSvc = createMethod.invoke(svcHome, new Object[0]);
            return remoteSvc;
        } catch(ClassCastException e) {
            log.error("Error creating EJB bean from JNDI Looking [" + beanHomeJNDIName + "]",e);
            throw new InvalidServiceException("Can not find bean home interface ["
                    + beanHomeJNDIName + "]", e);
        } catch(NameNotFoundException e) {
            log.error("Can not find EJB bean in JNDI: [" + beanHomeJNDIName + "]",e);
            throw new UnknownServiceException("Can not find bean home interface ["
                    + beanHomeJNDIName + "]", e);
        } catch (NamingException e) {
            log.error("Can not find EJB bean in JNDI: [" + beanHomeJNDIName + "]",e);
            throw new UnknownServiceException("JNDI error looking up bean home interface ["
                    + beanHomeJNDIName + "]", e);
        } catch (Exception e) {
            log.error(e,e);
            throw new InvalidServiceException("Can not create bean ["
                    + beanHomeJNDIName + "]", e);
        }
    }
}