diff --git a/ass1-jpa/src/main/java/dst/ass1/jpa/listener/DefaultListener.java b/ass1-jpa/src/main/java/dst/ass1/jpa/listener/DefaultListener.java
index bd3a7bf..91620bd 100644
--- a/ass1-jpa/src/main/java/dst/ass1/jpa/listener/DefaultListener.java
+++ b/ass1-jpa/src/main/java/dst/ass1/jpa/listener/DefaultListener.java
@@ -1,44 +1,71 @@
 package dst.ass1.jpa.listener;
 
 
+import javax.persistence.*;
+import java.util.*;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicLong;
+
 public class DefaultListener {
+    private static final AtomicInteger countLoad = new AtomicInteger(0);
+    private static final AtomicInteger countUpdate = new AtomicInteger(0);
+    private static final AtomicInteger countRemove = new AtomicInteger(0);
+    private static final AtomicInteger countPersist = new AtomicInteger(0);
+    private static final AtomicLong overallTime = new AtomicLong(0);
+    private static final List<Date> persistDateStart = Collections.synchronizedList(new ArrayList<>());
+    private static final List<Date> persistDateEnd = Collections.synchronizedList(new ArrayList<>());
 
-    // TODO
-
+    @PostLoad
     public static int getLoadOperations() {
-        // TODO
-        return -1;
+        return countLoad.incrementAndGet();
     }
 
+    @PostUpdate
     public static int getUpdateOperations() {
-        // TODO
-        return -1;
+        return countUpdate.incrementAndGet();
     }
 
+    @PostRemove
     public static int getRemoveOperations() {
-        // TODO
-        return -1;
+        return countRemove.incrementAndGet();
+    }
+
+    @PrePersist
+    private void prePersist() {
+        persistDateStart.add(new Date());
+    }
+
+    @PostPersist
+    private void postPersist() {
+        persistDateEnd.add(new Date());
+        long delta = persistDateEnd.get(persistDateEnd.size() - 1).getTime()
+                   - persistDateStart.get(persistDateStart.size() - 1).getTime();
+        overallTime.getAndAdd(delta);
+        countPersist.incrementAndGet();
     }
 
     public static int getPersistOperations() {
-        // TODO
-        return -1;
+        return countPersist.incrementAndGet();
     }
 
     public static long getOverallTimeToPersist() {
-        // TODO
-        return -1;
+        return overallTime.get();
     }
 
     public static double getAverageTimeToPersist() {
-        // TODO
-        return -1;
+        return (double) getOverallTimeToPersist() / countPersist.get();
     }
 
     /**
      * Clears the internal data structures that are used for storing the operations.
      */
     public static void clear() {
-        // TODO
+        countLoad.set(0);
+        countUpdate.set(0);
+        countRemove.set(0);
+        countPersist.set(0);
+        overallTime.set(0);
+        persistDateStart.clear();
+        persistDateEnd.clear();
     }
 }