protected void notifyGone(L locator){
synchronized (this) {
    if (!staleLocators.add(locator.getPartitionId())) {
      fail("Locator already in stale locators collection? " + locator);
    }
  }
}

protected void notifyGone ( L locator ) { synchronized ( this ) { if ( ! staleLocators . add ( locator . getPartitionId ( ) ) ) { fail ( "Locator already in stale locators collection? " + locator ) ; } } }
notify the data service that an index partition is no longer located on that data service .
