@Override
public void execute(HttpServletRequest req, HttpServletResponse resp, ConfigService configService)
throws IOException {
String pvName = req.getParameter("pv");
if (pvName == null || pvName.equals("")) {
resp.sendError(HttpServletResponse.SC_BAD_REQUEST);
return;
}
Event event = configService.getETLLookup().getLatestEventFromDataStores(pvName);
if (event != null) {
resp.setContentType(MimeTypeConstants.APPLICATION_JSON);
HashMap<String, String> result = new HashMap<String, String>();
result.put("timestamp", TimeUtils.convertToISO8601String(event.getEventTimeStamp()));
try (PrintWriter out = resp.getWriter()) {
out.println(JSONValue.toJSONString(result));
}
} else {
resp.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
}
private void consumeEventStreamAndOutputToMimeResponse(EventStream strm) throws Exception {
try {
int eventsInCurrentStream = 0;
for (Event e : strm) {
try {
eventsInCurrentStream++;
if (!haveIpushedTheFirstEvent && firstEvent == null) {
logger.debug(
"Making a copy of the first event "
+ TimeUtils.convertToHumanReadableString(e.getEventTimeStamp()));
firstEvent = e.makeClone();
continue;
}
if (!haveIpushedTheFirstEvent) {
if (e.getEventTimeStamp().before(this.startTimeStamp)) {
logger.debug(
"Making a copy of another event "
+ TimeUtils.convertToHumanReadableString(e.getEventTimeStamp()));
firstEvent = e.makeClone();
continue;
} else {
haveIpushedTheFirstEvent = true;
logger.debug(
"Consuming first and current events "
+ TimeUtils.convertToHumanReadableString(e.getEventTimeStamp()));
mimeresponse.consumeEvent(firstEvent);
timestampOfLastEvent = firstEvent.getEventTimeStamp();
totalEvents++;
if (!e.getEventTimeStamp().after(timestampOfLastEvent)) {
logger.debug(
"After sending first event, current event is not after the first event. Skipping "
+ TimeUtils.convertToHumanReadableString(e.getEventTimeStamp()));
skippedEvents++;
continue;
} else {
mimeresponse.consumeEvent(e);
totalEvents++;
timestampOfLastEvent = e.getEventTimeStamp();
continue;
}
}
}
if (amIDeduping) {
comparedEvents++;
if (!e.getEventTimeStamp().after(timestampOfLastEvent)) {
skippedEvents++;
continue;
} else {
amIDeduping = false;
mimeresponse.consumeEvent(e);
timestampOfLastEvent = e.getEventTimeStamp();
totalEvents++;
}
} else {
mimeresponse.consumeEvent(e);
timestampOfLastEvent = e.getEventTimeStamp();
totalEvents++;
}
} catch (InvalidProtocolBufferException | PBParseException ex) {
logger.warn(ex.getMessage(), ex);
if (this.mimeresponse instanceof ExceptionCommunicator) {
((ExceptionCommunicator) this.mimeresponse).comminucateException(ex);
}
skippedEvents++;
}
}
if (eventsInCurrentStream == 0) {
logger.info(
"The stream from "
+ ((strm.getDescription() != null) ? strm.getDescription().getSource() : "Unknown")
+ " was an empty stream.");
}
// We start deduping at the boundaries of event streams.
// This does not apply until we have pushed the first event out..
if (haveIpushedTheFirstEvent) startDeduping();
} catch (InvalidProtocolBufferException | PBParseException ex) {
logger.warn(ex.getMessage(), ex);
if (this.mimeresponse instanceof ExceptionCommunicator) {
((ExceptionCommunicator) this.mimeresponse).comminucateException(ex);
}
skippedEvents++;
}
}