-public class SendHeartBeat implements Serializable {
- private static final long serialVersionUID = 1L;
+public final class SendHeartBeat implements ControlMessage {
+ public static final SendHeartBeat INSTANCE = new SendHeartBeat();
+
+ private SendHeartBeat() {
+ // Hidden on purpose
+ }
+
+ private Object readResolve() {
+ return INSTANCE;
+ }