Hrm. appears one class did not make it in the previous commit.

dddsample/tracking/core/src/main/java/se/citerus/dddsample/tracking/core/domain/model/handling/EventSequenceNumber.java

@@ -0,0 +1,51 @@
+package se.citerus.dddsample.tracking.core.domain.model.handling;
+
+import se.citerus.dddsample.tracking.core.domain.shared.ValueObject;
+
+import java.util.concurrent.atomic.AtomicLong;
+
+public class EventSequenceNumber implements ValueObject<EventSequenceNumber> {
+
+  private long value;
+  private static final AtomicLong SEQUENCE = new AtomicLong(System.currentTimeMillis());
+
+  private EventSequenceNumber(final long value) {
+    this.value = value;
+  }
+
+  public static EventSequenceNumber next() {
+    return new EventSequenceNumber(SEQUENCE.getAndIncrement());
+  }
+
+  public long longValue() {
+    return value;
+  }
+
+  @Override
+  public boolean sameValueAs(final EventSequenceNumber other) {
+    return false;
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o == null || getClass() != o.getClass()) return false;
+
+    return sameValueAs((EventSequenceNumber) o);
+  }
+
+  @Override
+  public int hashCode() {
+    return Long.valueOf(value).hashCode();
+  }
+
+  @Override
+  public String toString() {
+    return String.valueOf(value);
+  }
+
+  EventSequenceNumber() {
+    // Needed by Hibernate
+  }
+
+}