public Iterable<Node<T>> getSuccessors(Node<T> node, NodeType type) {
// check cache first
NodeItem<T> cachedSuccessorNodes = cache.get(node);
if (cachedSuccessorNodes == null || cachedSuccessorNodes.getNodeType() != type) {
// compute new results.
// LOG.debug("cache miss with node: "+node.getId());
Iterable<Node<T>> computedSuccessors = workerSuccessorService.getSuccessors(node, type);
// add to cache
cachedSuccessorNodes = new NodeItem<T>(type, computedSuccessors, node);
cache.put(node, cachedSuccessorNodes);
} else {
LOG.debug("cache hit with node: " + node.getId());
}
return cachedSuccessorNodes.getSuccessors();
}
public Iterable<NodeVisitor<T>> getRequestedVisitors() {
return Iterables.concat(
Lists.<NodeVisitor<T>>newArrayList(this), workerSuccessorService.getRequestedVisitors());
}
