return null;
case REQUEST_LEAVE:
cacheViewsManager.handleRequestLeave(sender, cacheName);
return null;
case PREPARE_VIEW:
cacheViewsManager.handlePrepareView(sender, cacheName, new CacheView(newViewId, newMembers),
new CacheView(oldViewId, oldMembers));
return null;
case COMMIT_VIEW:
cacheViewsManager.handleCommitView(sender, cacheName, newViewId);
return null;
case ROLLBACK_VIEW: