org.jbpm.bpel.tutorial.purchase.ejb.InvoiceCallbackMessageBean.java Source code

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Here is the source code for org.jbpm.bpel.tutorial.purchase.ejb.InvoiceCallbackMessageBean.java

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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2005, JBoss Inc., and individual contributors as indicated
 * by the @authors tag.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the JBPM BPEL PUBLIC LICENSE AGREEMENT as
 * published by JBoss Inc.; either version 1.0 of the License, or
 * (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 */
package org.jbpm.bpel.tutorial.purchase.ejb;

import java.rmi.RemoteException;

import javax.ejb.MessageDrivenBean;
import javax.ejb.MessageDrivenContext;
import javax.jms.JMSException;
import javax.jms.MapMessage;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.xml.rpc.ServiceException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.jbpm.bpel.tutorial.purchase.Invoice;
import org.jbpm.bpel.tutorial.purchase.InvoiceCallbackPT;
import org.jbpm.bpel.tutorial.purchase.PurchaseOrderService;

/**
 * Asynchronous invoice callback bean.
 * @author Jeff DeLong
 * @author Alejandro Guizar
 * @version $Revision$ $Date: 2007/11/29 10:31:47 $
 */
public class InvoiceCallbackMessageBean implements MessageDrivenBean, MessageListener {

    protected MessageDrivenContext messageContext;
    protected InvoiceCallbackPT invoiceRequester;

    private static final Log log = LogFactory.getLog(InvoiceCallbackMessageBean.class);
    private static final long serialVersionUID = 1L;

    /**
     * Process the invoice callback message.
     */
    public void onMessage(Message message) {
        if (!(message instanceof MapMessage)) {
            log.error("received non-map message: " + message);
            messageContext.setRollbackOnly();
            return;
        }
        try {
            // extract contents
            MapMessage invoiceMessage = (MapMessage) message;
            int orderId = invoiceMessage.getInt("orderId");
            float amount = invoiceMessage.getFloat("amount");

            // populate invoice with contents
            Invoice inv = new Invoice();
            inv.setOrderId(orderId);
            inv.setAmount(amount);

            // send invoice back to requester
            invoiceRequester.sendInvoice(inv);

            log.debug("sent invoice: orderId=" + orderId + ", amount=" + amount);
        } catch (JMSException e) {
            messageContext.setRollbackOnly();
            log.error("could not read invoice message", e);
        } catch (RemoteException e) {
            messageContext.setRollbackOnly();
            log.error("could not send invoice", e);
        }
    }

    public void setMessageDrivenContext(MessageDrivenContext messageContext) {
        this.messageContext = messageContext;
    }

    public void ejbCreate() {
        try {
            PurchaseOrderService service = lookupPurchaseOrderService();
            invoiceRequester = service.getInvoiceRequesterPort();
            log.debug("got invoice callback endpoint: " + invoiceRequester);
        } catch (NamingException e) {
            log.error("could not retrieve purchase order service", e);
        } catch (ServiceException e) {
            log.error("could not get invoice requester endpoint", e);
        }
    }

    public void ejbRemove() {
        messageContext = null;
        invoiceRequester = null;
    }

    protected PurchaseOrderService lookupPurchaseOrderService() throws NamingException {
        InitialContext initialContext = new InitialContext();
        try {
            return (PurchaseOrderService) initialContext.lookup("java:comp/env/service/PurchaseOrder");
        } finally {
            initialContext.close();
        }
    }
}