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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: SynchronousLoanBroker.java 20321 2010-11-24 15:21:24Z dfeist $
 * --------------------------------------------------------------------------------------
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 *
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */

package org.mule.example.loanbroker.esn;

import org.mule.example.loanbroker.DefaultLoanBroker;
import org.mule.example.loanbroker.LoanBrokerException;
import org.mule.example.loanbroker.credit.CreditAgencyService;
import org.mule.example.loanbroker.messages.CreditProfile;
import org.mule.example.loanbroker.messages.CustomerQuoteRequest;
import org.mule.example.loanbroker.messages.LoanBrokerQuoteRequest;

/**
 * SyncLoanBroker is a synchronous Loan Broker that makes the calls to
 * various components through the event context synchronously.
 */
public class SynchronousLoanBroker extends DefaultLoanBroker
{
    //A proxy for this object gets injected via the  element configured on this service.
    //The proxy will then call out to an endpoint and return the result.
    //The transformers configured on the endpoint control how data is marshalled into and out of the call.
    private CreditAgencyService creditAgency;

    @Override
    public Object getLoanQuote(CustomerQuoteRequest request) throws LoanBrokerException
    {
        super.getLoanQuote(request);
        LoanBrokerQuoteRequest bqr = new LoanBrokerQuoteRequest();
        bqr.setCustomerRequest(request);

        //This calls out to the CreditAgency service (see above)
        CreditProfile cp = creditAgency.getCreditProfile(request.getCustomer());
        bqr.setCreditProfile(cp);

        return bqr;
    }

    public CreditAgencyService getCreditAgency()
    {
        return creditAgency;
    }

    public void setCreditAgency(CreditAgencyService creditAgency)
    {
        this.creditAgency = creditAgency;
    }
}