net.seedboxer.sources.filter.FilterManager.java Source code

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Here is the source code for net.seedboxer.sources.filter.FilterManager.java

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/*******************************************************************************
 * FilterManager.java
 *
 * Copyright (c) 2012 SeedBoxer Team.
 *
 * This file is part of SeedBoxer.
 *
 * SeedBoxer is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * SeedBoxer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with SeedBoxer.  If not, see <http ://www.gnu.org/licenses/>.
 ******************************************************************************/

package net.seedboxer.sources.filter;

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import com.google.common.collect.Maps;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import javax.annotation.PostConstruct;
import net.seedboxer.core.domain.Content;
import net.seedboxer.core.domain.User;
import net.seedboxer.core.logic.ContentManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

/**
 * @author The-Sultan
 * @author Jorge Davison (jdavisonc)
 */
@Component
@SuppressWarnings("rawtypes")
public class FilterManager {

    private static final Logger LOGGER = LoggerFactory.getLogger(FilterManager.class);

    private ContentManager contentManager;

    private List<ContentFilter> filters;

    private Cache<Content, List<User>> cache;

    @Value("${filter.cache.timeToLive}")
    private int cacheTimeToLive = 10;

    @Autowired
    public void setFilters(List<ContentFilter> filters) {
        this.filters = filters;
    }

    @Autowired
    public void setContentManager(ContentManager contentManager) {
        this.contentManager = contentManager;
    }

    public void setCacheTimeToLive(int cacheTimeToLive) {
        this.cacheTimeToLive = cacheTimeToLive;
    }

    @PostConstruct
    public void init() {
        cache = CacheBuilder.newBuilder().maximumSize(500).expireAfterWrite(cacheTimeToLive, TimeUnit.MINUTES)
                .build();
    }

    public synchronized Map<Content, List<User>> filterContent(List<Content> parsedContentList) {
        Map<Content, List<User>> mappedContent = mapContentWithUsers(parsedContentList);
        return filterContentWithHistory(filterContentWithCache(mappedContent));
    }

    /**
     * Maps the newly parsed content with the users, using the configured content for each user on the
     * Database.
     */
    private Map<Content, List<User>> mapContentWithUsers(List<Content> parsedContentList) {
        Map<Content, List<User>> mappedContent = Maps.newHashMap();
        for (Content parsedContent : parsedContentList) {
            if (mappedContent.containsKey(parsedContent)) {
                continue;
            }

            List<User> usersWantingThisContent = findUsersWantingThisContent(parsedContent);

            if (!usersWantingThisContent.isEmpty()) {
                mappedContent.put(parsedContent, usersWantingThisContent);
            }
        }
        return mappedContent;
    }

    private List<User> findUsersWantingThisContent(Content parsedContent) {
        List<User> usersWantingThisContent = new ArrayList<User>();

        for (ContentFilter filter : filters) {
            for (Content content : getContentWithName(parsedContent.getName(), filter)) {

                Boolean wantedContent = filter.filterIfPossible(content, parsedContent);
                if (wantedContent != null && wantedContent) {
                    usersWantingThisContent.add(content.getUser());
                }
            }
        }
        return usersWantingThisContent;
    }

    private List<Content> getContentWithName(String name, ContentFilter<?> filter) {
        return contentManager.getAllContentOfTypeAndName(name, filter.getType());
    }

    /**
     * After having the content mapped to each user, this method filters the users for each content
     * using the user's history, if history content is equal to a matchedContent, then the user is
     * removed.
     */
    private Map<Content, List<User>> filterContentWithHistory(Map<Content, List<User>> mappedContents) {
        List<Content> toRemove = new ArrayList<Content>();

        for (Map.Entry<Content, List<User>> entries : mappedContents.entrySet()) {

            Content content = entries.getKey();
            List<User> users = entries.getValue();
            List<User> usersThatAlreadyHaveThisContent = contentManager.getUsersWithContentInHistory(content,
                    users);

            if (users.size() == usersThatAlreadyHaveThisContent.size()) {
                toRemove.add(content);
            } else {
                users.removeAll(usersThatAlreadyHaveThisContent);
            }
        }

        for (Content content : toRemove) {
            mappedContents.remove(content);
        }
        return mappedContents;
    }

    /**
     * After having the content mapped to each user, this method filters the users for each content
     * using the user's cache (10 minutes by default to avoid dual downloads), if cache content is
     * equal to a matchedContent, then the user is removed.
     */
    private Map<Content, List<User>> filterContentWithCache(Map<Content, List<User>> mappedContents) {
        LOGGER.debug("Before filter with cache {}", mappedContents);

        List<Content> toRemove = new ArrayList<Content>();
        for (Map.Entry<Content, List<User>> entries : mappedContents.entrySet()) {

            Content content = entries.getKey();
            List<User> users = entries.getValue();
            List<User> usersThatAlreadyHaveThisContent = cache.getIfPresent(content);

            if (usersThatAlreadyHaveThisContent != null) {
                if (users.size() == usersThatAlreadyHaveThisContent.size()) {
                    toRemove.add(content);
                } else {
                    users.removeAll(usersThatAlreadyHaveThisContent);
                }
            } else {
                cache.put(content, users);
            }
        }

        for (Content content : toRemove) {
            mappedContents.remove(content);
        }
        LOGGER.debug("After filter with cache {}", mappedContents);
        return mappedContents;
    }

}