/**
* Retrieves the current logged user based on the session key.
*
* @param session http session holding currently logged username.
* @return User instance representing currently logged user.
* @throws IllegalArgumentException if session is null.
* @throws OPMException if there is any problem when executing the method.
*/
protected User getCurrentUser(HttpSession session) throws OPMException {
String signature = CLASS_NAME + "#getCurrentUser(HttpSession session)";
LoggingHelper.logEntrance(logger, signature, new String[] {"session"}, new Object[] {session});
Helper.checkNull(logger, signature, session, "session");
try {
String loggedUsername = (String) session.getAttribute(userSessionKey);
User result = userService.getByUsername(loggedUsername);
LoggingHelper.logExit(logger, signature, new Object[] {result});
return result;
} catch (IllegalArgumentException e) {
throw LoggingHelper.logException(
logger,
signature,
new OPMException(
"The attribute of key '" + userSessionKey + "' can't be null/empty.", e));
} catch (ClassCastException e) {
throw LoggingHelper.logException(
logger,
signature,
new OPMException("The attribute of key '" + userSessionKey + "' should be a string.", e));
}
}
/**
* This method is responsible for populating the model and view with the data about enabled
* widgets.
*
* @param session current http session.
* @param modelAndView the ModelAndView instance to populate
* @return The populated ModelAndView instance.
* @throws IllegalArgumentException if session or modelAndView instance is null.
* @throws OPMException if there is any problem when executing the method.
*/
protected ModelAndView populateModelAndView(HttpSession session, ModelAndView modelAndView)
throws OPMException {
String signature =
CLASS_NAME + "#populateModelAndView(HttpSession session, ModelAndView modelAndView)";
LoggingHelper.logEntrance(
logger,
signature,
new String[] {"session", "modelAndView"},
new Object[] {session, modelAndView});
Helper.checkNull(logger, signature, modelAndView, "modelAndView");
User user = getCurrentUser(session);
if (user == null) {
throw LoggingHelper.logException(
logger, signature, new OPMException("The user is not logged in."));
}
for (String widgetId : widgetIds) {
try {
securityService.authorize(
user.getUsername(), Arrays.asList(user.getRole().getName()), widgetId);
modelAndView.addObject(widgetId, true);
} catch (AuthorizationException e) {
modelAndView.addObject(widgetId, false);
}
}
LoggingHelper.logExit(logger, signature, new Object[] {modelAndView});
return modelAndView;
}
/**
* Resolves the exception and sets proper http code.
*
* @param request the http servlet request
* @param response the http servlet response
* @param handler the handler object
* @param exception the thrown exception
* @return Resulting ModelAndView to show to user
*/
public ModelAndView resolveException(
HttpServletRequest request,
HttpServletResponse response,
Object handler,
Exception exception) {
String signature =
CLASS_NAME
+ "#resolveException(HttpServletRequest request, HttpServletResponse response,"
+ " Object handler, Exception exception)";
LoggingHelper.logEntrance(
logger,
signature,
new String[] {"request", "response", "handler", "exception"},
new Object[] {request, response, handler, exception});
ModelAndView result;
// Perform the check only for AJAX requests
if ("XMLHttpRequest".equals(request.getHeader("X-Requested-With"))) {
try {
String message = exception.getMessage();
if (exception instanceof ValidationException) {
response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
} else if (exception instanceof AuthorizationException) {
response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
} else {
response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
}
// Write exception message to response
response.getWriter().print(message);
} catch (IOException e) {
// Log and ignore the exception
LoggingHelper.logException(logger, signature, e);
}
result = new ModelAndView();
} else {
// Return error page
result = new ModelAndView("error");
}
LoggingHelper.logExit(logger, signature, new Object[] {result});
return result;
}
/**
* Checks the user request.
*
* @param logger the logger object.
* @param signature the signature of the method to be logged.
* @param invalidStates the states of user request.
* @param messages the messages
* @param errorMessage the error message
* @throws ValidationException if any error occurs
*/
public static void checkRequest(
Logger logger,
String signature,
boolean[] invalidStates,
String[] messages,
String errorMessage)
throws ValidationException {
List<String> details = new ArrayList<String>();
for (int i = 0; i < invalidStates.length; i++) {
if (invalidStates[i]) {
details.add(messages[i]);
}
}
if (!details.isEmpty()) {
throw LoggingHelper.logException(
logger, signature, new ValidationException(errorMessage, details));
}
}
/**
* Executes the rules to the service periods to calculate their deductions. This methods also
* merges the service period to extended service period.
*
* @param request that contains the service periods to calculate.
* @return the response of the extended service periods with calculated deductions (and also
* earnings, mid-point etc.).
* @throws IllegalArgumentException if the request is null.
* @throws RuleServiceException if any error occurs when executing the rule.
*/
@Override
public DeductionCalculationResponse execute(DeductionCalculationRequest request)
throws RuleServiceException {
// log the entrance
String signature = CLASS_NAME + "#execute(DeductionCalculationRequest request)";
LoggingHelper.logEntrance(
getLogger(), signature, new String[] {"request"}, new Object[] {request});
// validate the parameters
ServiceHelper.checkNull(request, "request");
StatefulKnowledgeSession ksession = null;
KnowledgeRuntimeLogger logger = null;
try {
// start new session and the file logger
ksession = getKnowledgeBase().newStatefulKnowledgeSession();
logger = KnowledgeRuntimeLoggerFactory.newFileLogger(ksession, getKnowledgeLogFileName());
// Set global variables
List<ExtendedServicePeriod> esps = new ArrayList<ExtendedServicePeriod>();
ksession.setGlobal(EXTENDED_SERVICE_PERIODS, esps);
ksession.setGlobal(
SERVICE_PERIOD_SPLIT_DATES,
servicePeriodSplitDates == null ? Collections.EMPTY_LIST : servicePeriodSplitDates);
// Populate facts
for (ServicePeriod sp : request.getServicePeriods()) {
ksession.insert(sp);
}
// Start deduction process
ksession.startProcess("Deduction");
// Fire all rules
ksession.fireAllRules();
// populate the final result
DeductionCalculationResponse response = new DeductionCalculationResponse();
response.setExtendedServicePeriods(esps);
ksession.dispose();
// log and return
LoggingHelper.logExit(getLogger(), signature, new Object[] {response});
return response;
} catch (RuntimeException e) {
// log the exception and wrap it to RuleServiceException
throw LoggingHelper.logException(
getLogger(),
signature,
new RuleServiceException("Unable to complete rule execution.", e));
} finally {
// closes the resources
if (logger != null) {
logger.close();
}
if (ksession != null) {
ksession.dispose();
}
}
}
