package org.epics.archiverappliance.engine.bpl.reports;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.log4j.Logger;
import org.epics.archiverappliance.common.BPLAction;
import org.epics.archiverappliance.config.ConfigService;
import org.epics.archiverappliance.engine.model.ArchiveChannel;
import org.epics.archiverappliance.engine.pv.EngineContext;
import org.epics.archiverappliance.engine.pv.PVMetrics;
import org.epics.archiverappliance.utils.ui.MimeTypeConstants;
import org.json.simple.JSONValue;
public class DroppedEventsBufferOverflowReport implements BPLAction {
private static Logger logger = Logger.getLogger(DroppedEventsBufferOverflowReport.class.getName());
private static class PVDroppedEvents {
String pvName;
long droppedEvents;
PVDroppedEvents(String pvName, long droppedEvents) {
this.pvName = pvName;
this.droppedEvents = droppedEvents;
}
};
@Override
public void execute(HttpServletRequest req, HttpServletResponse resp,
ConfigService configService) throws IOException {
String limit = req.getParameter("limit");
logger.info("Report for PVs that have dropped events because of buffer overflows for " + (limit == null ? "default limit " : ("limit " + limit)));
resp.setContentType(MimeTypeConstants.APPLICATION_JSON);
List<PVDroppedEvents> eventRates = getDroppedEventsBufferOverflow(configService, limit);
LinkedList<HashMap<String, String>> result = new LinkedList<HashMap<String, String>>();
try (PrintWriter out = resp.getWriter()) {
for(PVDroppedEvents eventRate : eventRates) {
HashMap<String, String> pvStatus = new HashMap<String, String>();
result.add(pvStatus);
pvStatus.put("pvName", eventRate.pvName);
pvStatus.put("eventsDropped", Long.toString(eventRate.droppedEvents));
}
out.println(JSONValue.toJSONString(result));
}
}
private static List<PVDroppedEvents> getDroppedEventsBufferOverflow(ConfigService configService, String limit) {
ArrayList<PVDroppedEvents> eventRates = new ArrayList<PVDroppedEvents>();
EngineContext engineContext = configService.getEngineContext();
for(ArchiveChannel channel : engineContext.getChannelList().values()) {
PVMetrics pvMetrics = channel.getPVMetrics();
if(pvMetrics.getSampleBufferFullLostEventCount() > 0) {
eventRates.add(new PVDroppedEvents(channel.getName(), pvMetrics.getSampleBufferFullLostEventCount()));
}
}
Collections.sort(eventRates, new Comparator<PVDroppedEvents>() {
@Override
public int compare(PVDroppedEvents o1, PVDroppedEvents o2) {
if(o1.droppedEvents == o2.droppedEvents) return o1.pvName.compareTo(o2.pvName);
return (o1.droppedEvents < o2.droppedEvents) ? 1 : -1; // We want a descending sort
}
});
if(limit == null) {
return eventRates;
}
int limitNum = Integer.parseInt(limit);
return eventRates.subList(0, Math.min(limitNum, eventRates.size()));
}
}