public void doPost(HttpServletRequest req, HttpServletResponse res)
throws IOException, ServletException {
String result = "";
try {
String action = req.getParameter("action");
if (action == null) {
result =
"<html><head>"
+ "<title>Worklet Dynamic Process Selection and Exception Service</title>"
+ "</head><body>"
+ "<H3>Welcome to the Worklet Dynamic Process Selection and "
+ "Exception Service \"Gateway\"</H3>"
+ "<p> The Worklet Gateway acts as a bridge between the Worklet "
+ "Service and the external RDREditor (it isn't meant to be browsed "
+ " to directly). It provides the "
+ "functionality to trigger a running worklet replacement "
+ "due to an addtion to the ruleset (by the editor).</p>"
+ "</body></html>";
} else if (action.equalsIgnoreCase("replace")) {
_log.info("Received a request from the Rules Editor to replace " + "a running worklet.");
String itemID = req.getParameter("itemID");
int exType = Integer.parseInt(req.getParameter("exType"));
// get the service instance and call replace
if (exType == WorkletService.XTYPE_SELECTION) {
WorkletService ws = WorkletService.getInstance();
result = ws.replaceWorklet(itemID);
} else {
String caseID = req.getParameter("caseID");
String trigger = req.getParameter("trigger");
ExceptionService ex = ExceptionService.getInst();
result = ex.replaceWorklet(exType, caseID, itemID, trigger);
}
} else if (action.equalsIgnoreCase("refresh")) {
String specID = req.getParameter("specid");
String specVersion = req.getParameter("specversion");
String specURI = req.getParameter("specuri");
WorkletService ws = WorkletService.getInstance();
ws.refreshRuleSet(new YSpecificationID(specID, specVersion, specURI));
}
// generate the output
OutputStreamWriter outputWriter = ServletUtils.prepareResponse(res);
ServletUtils.finalizeResponse(outputWriter, result);
} catch (Exception e) {
_log.error("Exception in doPost()", e);
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException {
OutputStreamWriter outputWriter = ServletUtils.prepareResponse(response);
StringBuilder output = new StringBuilder();
output.append("<response>");
output.append(processPostQuery(request));
output.append("</response>");
if (_engine.enginePersistenceFailure()) {
_log.fatal("************************************************************");
_log.fatal("A failure has occurred whilst persisting workflow state to the");
_log.fatal("database. Check the status of the database connection defined");
_log.fatal("for the YAWL service, and restart the YAWL web application.");
_log.fatal("Further information may be found within the Tomcat log files.");
_log.fatal("************************************************************");
response.sendError(500, "Database persistence failure detected");
}
outputWriter.write(output.toString());
outputWriter.flush();
outputWriter.close();
// todo find out how to provide a meaningful 500 message in the format of a fault message.
}