package edu.uci.iotproject.analysis;
import java.time.Instant;
+import java.time.ZoneId;
+import java.time.format.DateTimeFormatter;
/**
* Models a user's action, such as toggling the smart plug on/off at a given time.
*/
public class UserAction {
+ private static volatile DateTimeFormatter TIMESTAMP_FORMATTER = DateTimeFormatter.ISO_ZONED_DATE_TIME.
+ withZone(ZoneId.of("America/Los_Angeles"));
+
+ /**
+ * Sets the {@link DateTimeFormatter} used when outputting a user action as a string and parsing a user action from
+ * a string.
+ * @param formatter The formatter to use for outputting and parsing.
+ */
+ public static void setTimestampFormatter(DateTimeFormatter formatter) {
+ TIMESTAMP_FORMATTER = formatter;
+ }
+
+ /**
+ * Instantiates a {@code UserAction} from a string that obeys the format used in {@link UserAction#toString()}.
+ * @param string The string that represents a {@code UserAction}
+ * @return A {@code UserAction} resulting from deserializing the string.
+ */
+ public static UserAction fromString(String string) {
+ String[] parts = string.split("@");
+ if (parts.length != 2) {
+ throw new IllegalArgumentException("Invalid string format");
+ }
+ // If any of these two parses fail, an exception is thrown -- no need to check return values.
+ UserAction.Type actionType = UserAction.Type.valueOf(parts[0].trim());
+ Instant timestamp = TIMESTAMP_FORMATTER.parse(parts[1].trim(), Instant::from);
+ return new UserAction(actionType, timestamp);
+ }
+
+
/**
* The specific type of action the user performed.
*/
@Override
public String toString() {
- return String.format("[ %s @ %s ]", mType.name(), mTimestamp.toString());
+ return String.format("%s @ %s", mType.name(), TIMESTAMP_FORMATTER.format(mTimestamp));
}
}
--- /dev/null
+package edu.uci.iotproject.evaluation;
+
+import edu.uci.iotproject.analysis.TriggerTrafficExtractor;
+import edu.uci.iotproject.analysis.UserAction;
+import edu.uci.iotproject.io.TriggerTimesFileReader;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * Utility for comparing detected events to logged (actual) events.
+ *
+ * @author Janus Varmarken {@literal <jvarmark@uci.edu>}
+ * @author Rahmadi Trimananda {@literal <rtrimana@uci.edu>}
+ */
+public class DetectionResultsAnalyzer {
+
+ public static void main(String[] args) throws IOException {
+ // -------------------------------------- Parse the input files --------------------------------------
+
+ String triggerTimesFile = args[0];
+ // Read the trigger times.
+ // The trigger times file does not contain event types as we initially assumed that we would just be alternating
+ // between ON and OFF.
+ List<Instant> triggerTimestamps = new TriggerTimesFileReader().readTriggerTimes(triggerTimesFile, false);
+ // Now generate user actions based on this alternating ON/OFF pattern.
+ List<UserAction> triggers = new ArrayList<>();
+ for (int i = 0; i < triggerTimestamps.size(); i++) {
+ // NOTE: assumes triggers alternate between ON and OFF
+ UserAction.Type actionType = i % 2 == 0 ? UserAction.Type.TOGGLE_ON : UserAction.Type.TOGGLE_OFF;
+ triggers.add(new UserAction(actionType, triggerTimestamps.get(i)));
+ }
+ // Read the detection output file, assuming a format as specified in UserAction.toString()
+ File detectionOutputFile = new File(args[1]);
+ List<UserAction> detectedEvents = new ArrayList<>();
+ try (BufferedReader br = new BufferedReader(new FileReader(detectionOutputFile))) {
+ String s;
+ while ((s = br.readLine()) != null) {
+ detectedEvents.add(UserAction.fromString(s));
+ }
+ }
+
+ // ----------------- Now ready to compare the detected events with the logged events -----------------
+
+ // To contain all detected events that could be mapped to a trigger
+ List<UserAction> truePositives = new ArrayList<>();
+ for (UserAction detectedEvent : detectedEvents) {
+ Optional<UserAction> matchingTrigger = triggers.stream()
+ .filter(t -> t.getType() == detectedEvent.getType() &&
+ t.getTimestamp().isBefore(detectedEvent.getTimestamp()) &&
+ t.getTimestamp().plusMillis(TriggerTrafficExtractor.INCLUSION_WINDOW_MILLIS).
+ isAfter(detectedEvent.getTimestamp())
+ ).findFirst();
+ matchingTrigger.ifPresent(mt -> {
+ // We've consumed the trigger (matched it with a detected event), so remove it so we don't match with
+ // another detected event.
+ triggers.remove(mt);
+ // The current detected event was a true positive as we could match it with a trigger.
+ truePositives.add(detectedEvent);
+ });
+ }
+ // Now the false positives are those elements in detectedEvents that are not in truePositives
+ List<UserAction> falsePositives = new ArrayList<>();
+ falsePositives.addAll(detectedEvents);
+ falsePositives.removeAll(truePositives);
+ // Print the results...
+ System.out.println("---------- False negatives (events that where not detected) ----------");
+ for (UserAction missing : triggers) {
+ System.out.println(missing);
+ }
+ System.out.println("Total of " + Integer.toString(triggers.size()));
+ System.out.println();
+ System.out.println("---------- False positives (detected, but no matching trigger) ----------");
+ for (UserAction fp : falsePositives) {
+ System.out.println(fp);
+ }
+ System.out.println("Total of " + Integer.toString(falsePositives.size()));
+ }
+
+}