// Step 3 - Connects nodes
Queue<Node> todo2 = new ConcurrentLinkedQueue<Node>(nodeSet);
executor = Executors.newFixedThreadPool(numThreads);
for (int j = 0; j < numThreads; j++) {
Runnable worker = new TaxonomyWorker2(factory,
conceptNodeIndex, direc, todo2, nodeSet);
executor.execute(worker);
}
executor.shutdown();