/** All friend Sones. */
private final Set<Sone> friendSones = new HashSet<Sone>();
+ /** Modification count. */
+ private volatile long modificationCounter = 0;
+
/**
* Creates a new Sone.
*
* The friend Sone to add
* @return This Sone (for method chaining)
*/
- public Sone addFriendSone(Sone friendSone) {
- friendSones.add(friendSone);
+ public synchronized Sone addFriendSone(Sone friendSone) {
+ if (friendSones.add(friendSone)) {
+ modificationCounter++;
+ }
return this;
}
* The friend Sone to remove
* @return This Sone (for method chaining)
*/
- public Sone removeFriendSone(Sone friendSone) {
- friendSones.remove(friendSone);
+ public synchronized Sone removeFriendSone(Sone friendSone) {
+ if (friendSones.remove(friendSone)) {
+ modificationCounter++;
+ }
return this;
}
+ /**
+ * Returns the modification counter.
+ *
+ * @return The modification counter
+ */
+ public synchronized long getModificationCounter() {
+ return modificationCounter;
+ }
+
+ /**
+ * Sets the modification counter.
+ *
+ * @param modificationCounter
+ * The new modification counter
+ */
+ public synchronized void setModificationCounter(long modificationCounter) {
+ this.modificationCounter = modificationCounter;
+ }
+
//
// OBJECT METHODS
//