*
* Typically the Leader to itself on a schedule
*/
-public class SendHeartBeat implements Serializable {
+public final class SendHeartBeat implements Serializable {
private static final long serialVersionUID = 1L;
+ public static final SendHeartBeat INSTANCE = new SendHeartBeat();
+
+ private SendHeartBeat() {
+ // Hidden on purpose
+ }
+
+ @SuppressWarnings({ "static-method", "unused" })
+ private SendHeartBeat readResolve() {
+ return INSTANCE;
+ }
}