private void initializeSelectorIfNeeded(
NodeBasedContext lastContext, GraphDatabaseService database) {
if (selector == null) {
long lastId = -1;
Node lastNode = determineLastNode(lastContext, database);
if (lastNode != null) {
lastId = lastNode.getId();
}
selector = new ContinuousNodeSelector(config.getNodeInclusionPolicy(), lastId);
}
}
/** {@inheritDoc} */
@Override
public NodeBasedContext doSomeWork(NodeBasedContext lastContext, GraphDatabaseService database) {
initializeSelectorIfNeeded(lastContext, database);
Node node = determineNextNode(database);
if (node == null) {
LOG.warn(
"RecommendationModule did not find a node to continue with. There are no nodes matching the configuration.");
return lastContext;
}
LOG.info("Computing for " + node.getId());
List<Recommendation<Node>> recommendations =
config.getEngine().recommend(node, config.getConfig());
persistRecommendations(node, recommendations);
return new NodeBasedContext(node);
}