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The Loan Broker example application is based on the example presented in the Enterprise Integration Patterns book. This chapter of the book is available online so you can see a detailed description of the application here (http://www.eaipatterns.com/ComposedMessagingWS.html).

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/*
 * $Id: SyncLoanBroker.java 3982 2006-11-22 14:28:01Z lajos $
 * --------------------------------------------------------------------------------------
 * Copyright (c) MuleSource, Inc.  All rights reserved.  http://www.mulesource.com
 *
 * The software in this package is published under the terms of the MuleSource MPL
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */

package org.mule.samples.loanbroker;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.mule.impl.MuleMessage;
import org.mule.impl.RequestContext;
import org.mule.umo.UMOEventContext;
import org.mule.umo.UMOMessage;

/**
 * SyncLoanBroker is a synchronous Loan Broker that makes the calls to
 * various components through the event context synchronously.
 */
public class SyncLoanBroker
{
    /**
     * logger used by this class
     */
    protected static Log logger = LogFactory.getLog(SyncLoanBroker.class);

    public UMOMessage getLoanQuote(LoanRequest request) throws Exception
    {
        logger.info("\nClient " + request.getCustomer().getName() + " with ssn= "
                    + request.getCustomer().getSsn() + " requests a loan of amount= "
                    + request.getLoanAmount() + " for " + request.getLoanDuration() + " months");

        BankQuoteRequest bqr = new BankQuoteRequest();
        bqr.setLoanRequest(request);
        UMOEventContext context = RequestContext.getEventContext();

        // get the customers credit profile
        UMOMessage result = context.sendEvent(bqr);
        bqr.getLoanRequest().setCreditProfile(
            ((BankQuoteRequest)result.getPayload()).getLoanRequest().getCreditProfile());

        // This asynchronous dispatch will invoke all the bank services concurrently
        // The response of the Banks is handled by the response-router on this
        // component
        // that will block until the requests are received, then aggregate them and
        // send back a response

        // In order for the response router to tie up the response events with this
        // request we must
        // do a couple of things.
        // 1. Create our outbound message first before dispatching. This is so that
        // we can return the
        // the message and the response router can correlate reply messages based on
        // it's Id.
        // 2. Call setStopFurtherProcessing() so that Mule knows not to do any more
        // processing of the
        // event
        // 3. Must return the dispatched message from this call so that the response
        // transformer can get
        // the message id of the dispatched message. Of course custom implementations
        // can ignore these requirements
        // and implement a custom router that aggregates using something other than
        // the UMOMessage.getUniqueId()

        UMOMessage msg = new MuleMessage(bqr);
        // dispatch the message using the default outbound router settings
        context.dispatchEvent(msg);
        context.setStopFurtherProcessing(true);
        return msg;
    }

}