private InteractionModel getModel(Long domain) {
if (domain == null) {
logger.warn("EXCEPTION\tdomain null");
return null;
}
InteractionModel model = domainModels.get(domain);
if (model == null) {
model = new SimpleInteractionModel();
domainModels.put(domain, model);
}
return model;
}
/**
* Filter
*
* @author alejandr
*/
public class UserFilter implements Filter {
private static final DataLogger logger = DataLogger.getLogger(UserFilter.class);
private Map<Long, InteractionModel> domainModels;
public UserFilter() {
this.domainModels = new ConcurrentHashMap<Long, InteractionModel>();
}
private InteractionModel getModel(Long domain) {
if (domain == null) {
logger.warn("EXCEPTION\tdomain null");
return null;
}
InteractionModel model = domainModels.get(domain);
if (model == null) {
model = new SimpleInteractionModel();
domainModels.put(domain, model);
}
return model;
}
public List<Long> filter(Message message, Integer limit, Recommender rec) {
List<Long> allItems = rec.recommend(message, limit);
List<Long> filteredItems = new ArrayList<Long>();
// DataModelHelper.getDataModel(this.numberOfDays, d)
Long userID = message.getUserID();
Long domain = message.getDomainID();
if (domain != null) {
InteractionModel model = getModel(domain);
if (userID != null) {
Set<Long> alreadyObservedItems = model.getInteractions(userID);
int n = 0;
for (Long i : allItems) {
// check items by the user
if (!alreadyObservedItems.contains(i)) {
filteredItems.add(i);
n++;
if (n >= limit) {
break;
}
}
}
}
}
return filteredItems;
}
public void impression(Message _impression) {
final Long domain = _impression.getDomainID();
final Long client = _impression.getUserID();
final Long item = _impression.getItemID();
if (domain != null && client != null && item != null) {
getModel(domain).addImpression(client, item);
}
}
public void click(Message _feedback) {
final Long client = _feedback.getUserID();
final Long item = _feedback.getItemID();
final Long domain = _feedback.getDomainID();
if (domain != null && client != null && item != null) {
getModel(domain).addClick(client, item);
}
}
public void update(Message _update) {}
public static interface InteractionModel {
public void addClick(Long user, Long item);
public void addImpression(Long user, Long item);
public Set<Long> getInteractions(Long user);
}
public static class SimpleInteractionModel implements InteractionModel {
private Map<Long, Set<Long>> model;
public SimpleInteractionModel() {
model = new ConcurrentHashMap<Long, Set<Long>>();
}
private void add(Long user, Long item) {
if (user == null || item == null) {
return;
}
Set<Long> items = model.get(user);
if (items == null) {
items = Collections.newSetFromMap(new ConcurrentHashMap<Long, Boolean>());
model.put(user, items);
}
items.add(item);
}
public void addClick(Long user, Long item) {
add(user, item);
}
public void addImpression(Long user, Long item) {
add(user, item);
}
public Set<Long> getInteractions(Long user) {
if (user == null || !model.containsKey(user)) {
return new TreeSet<Long>();
}
return model.get(user);
}
}
}