/**
* sync getChildNames
*
* @return null if parentPath doesn't exist
*/
@Override
public List<String> getChildNames(String parentPath, int options) {
try {
List<String> childNames = _zkClient.getChildren(parentPath);
Collections.sort(childNames);
return childNames;
} catch (ZkNoNodeException e) {
return null;
}
}
@SuppressWarnings("unchecked")
private Element<T> getFirstElement() {
try {
while (true) {
List<String> list = _zkClient.getChildren(_root);
if (list.size() == 0) {
return null;
}
String elementName = getSmallestElement(list);
try {
return new Element<T>(
_root + "/" + elementName, (T) _zkClient.readData(_root + "/" + elementName));
} catch (ZkNoNodeException e) {
// somebody else picked up the element first, so we have to
// retry with the new first element
}
}
} catch (Exception e) {
throw ExceptionUtil.convertToRuntimeException(e);
}
}
public boolean isEmpty() {
return _zkClient.getChildren(_root).size() == 0;
}
