Java fcgi timer implementation

server/src/main/java/org/web1/Main.java

@@ -9,15 +9,19 @@
 import org.web1.utils.JsonBuilder;
 import org.web1.utils.QueryStringToHashmap;
 import org.web1.utils.ResponseController;
+import org.web1.utils.Timer;
 
 public class Main {
     private static final Function<String, HashMap<String,String>> parseQuery = new QueryStringToHashmap();
     private static final CheckerFunction checker = new Checker();
 
     public static void main(String[] args) {
         FCGIInterface fastCGI = new FCGIInterface();
+        Timer timer = new Timer();
 
         while (fastCGI.FCGIaccept() >= 0) {
+            timer.start();
+
             HashMap<String, String> queryParams = parseQuery.apply(
                     FCGIInterface.request.params.getProperty("QUERY_STRING")
             );
@@ -26,7 +30,7 @@ public static void main(String[] args) {
             String result = ResponseController.create(
                     new JsonBuilder()
                             .add("result", checkResult)
-                            .add("elapsedTime", 100)
+                            .add("elapsedTimeNs", timer.stop())
             );
 
             System.out.println(result);

server/src/main/java/org/web1/checkers/utils/GraphQuarters.java

@@ -4,5 +4,5 @@ public enum GraphQuarters {
     FIRST_QUADRANT,
     SECOND_QUADRANT,
     THIRD_QUADRANT,
-    FORTH_QUADRANT, FOURTH_QUADRANT
+    FOURTH_QUADRANT
 }

server/src/main/java/org/web1/utils/JsonBuilder.java

@@ -11,11 +11,13 @@ public <T> JsonBuilder add(String key, T value) {
     }
 
     public String build() {
+        if (data.isEmpty()) return "{}";
+
         StringBuilder jsonString = new StringBuilder("{\n");
 
         for (String key : data.keySet())
-            jsonString.append(String.format("\t%s: %s,\n", key, data.get(key)));
+            jsonString.append(String.format("\t\"%s\": %s,\n", key, data.get(key)));
 
-        return jsonString + "}";
+        return jsonString.substring(0, jsonString.length() - 2) + "\n}";
     }
 }

server/src/main/java/org/web1/utils/ResponseController.java

@@ -6,9 +6,8 @@ public class ResponseController {
             Connection: keep-alive
             Content-Type: application/json
             Content-Length: %d
-                       \s
-            %s
-           \s""";
+
+            %s""";
     public static String create(JsonBuilder jsonBuilder) {
         String response = jsonBuilder.build();
         return String.format(BASE_RESPONSE, response.length(), response);

server/src/main/java/org/web1/utils/Timer.java

@@ -0,0 +1,11 @@
+package org.web1.utils;
+
+public class Timer {
+    long startTime;
+    public void start() {
+        this.startTime = System.nanoTime();
+    }
+    public long stop() {
+        return System.nanoTime() - this.startTime;
+    }
+}