source: EDIS/trunk/java/tracking-server-core/src/main/java/gov/va/med/edp/web/controller/BigBoardClientVersionSynchronizationController.java@ 1227

package gov.va.med.edp.web.controller;


import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.log4j.Logger;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.ModelAndView;

/**
 * TODO: document BigBoardClientVersionSynchronizationController
 */
public class BigBoardClientVersionSynchronizationController extends ClientVersionSynchronizationController {


        private String errorMsg;

    private static Logger logger = Logger.getLogger(BigBoardClientVersionSynchronizationController.class);

        
    public void afterPropertiesSet() throws Exception {
        setRequireSession(false);
        super.afterPropertiesSet();
        Assert.notNull(serverPackageVersionDao, "serverPackageVersionDao must not be null");
        Assert.notNull(getSiteCodeDao(), "siteCodeDao is required");
        Assert.notNull(getTrackingDao(), "trackingDao is required");
        
    }

    protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response) throws Exception {
        //First attempt is to get the machineName from HTTP Header:EdisClientMachineName as decided 
        // this HTTP header is appended by the load balancer and the value of this header (the machine name)
        //is parsed by the load balancer.
        String machineName = parseCNFromHttpHeaders(request.getHeader(MACHINE_NAME_HEADER));            

        if (StringUtils.hasText(machineName)){
                debug("Machine name obtained from HTTP Header:" + MACHINE_NAME_HEADER + " was: " + machineName);
        } else {
                debug("No Machine name was found in HTTP Header:" + MACHINE_NAME_HEADER );
                machineName = getMachineNameFromUserPrincipalOrSessionOrRequest(request);
        }
        //set the machine name in an existing session for refreshes/restored sessions
                HttpSession session = request.getSession(false);
                if (session != null){
                session.setAttribute(MACHINE_NAME_PARAM, machineName);
                } else {
                return createErrorModelAndView("Invalid Session was detected. Please try re-launching the EDIS Big Board");
                }
        
        String siteCode = getSiteCodeDao().getSiteCode(machineName);
                debug("Site Code Obtained for Machine: " + machineName + " was: " + siteCode);

        if (!StringUtils.hasText(siteCode)){
                errorMsg = "A matching site code for the machine: " + machineName + " was not found in the EDP.SiteMapper table.\n" +
                                                "Please contact the EDIS national help desk with this message for remedy.";
                return createErrorModelAndView(errorMsg);
        }       
                
                String serverPackageVersion = (String) request.getSession().getAttribute(SessionConstants.SERVER_PACKAGE_VERSION_KEY);
        if (serverPackageVersion == null) {
                serverPackageVersion = serverPackageVersionDao.getServerPackageVersion(siteCode);
            request.getSession().setAttribute(SessionConstants.SERVER_PACKAGE_VERSION_KEY, serverPackageVersion);
        }
                debug("serverPackageVersion is: " + serverPackageVersion);

        if (isBoardNameAvailableForMachine(siteCode, machineName, request)) return super.handleRequestInternal(request, response);
        
        return createErrorModelAndView(errorMsg);
    }

        private boolean isBoardNameAvailableForMachine(String siteCode, String machineName, HttpServletRequest request) {
                String result = getTrackingDao().executeCommand(siteCode, "0", buildParameterMap(request,machineName));
        if (result.startsWith("<error>")){
                int start = result.indexOf("<error>");
                int end = result.indexOf("</error>");
                errorMsg = result.substring(start + 7, end);
                debug("isBoardNameAvailableForMachine: false");
                return false;
        } 
        debug("isBoardNameAvailableForMachine: true");
        return true;
        }

    private void debug(String s) {
        if (logger.isDebugEnabled()){
                logger.debug(s);
        }
        }

}