/*
* Copyright (c) JForum Team
* All rights reserved.
*
* Redistribution and use in source and binary forms,
* with or without modification, are permitted provided
* that the following conditions are met:
*
* 1) Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
* 2) Redistributions in binary form must reproduce the
* above copyright notice, this list of conditions and
* the following disclaimer in the documentation and/or
* other materials provided with the distribution.
* 3) Neither the name of "Rafael Steil" nor
* the names of its contributors may be used to endorse
* or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT
* HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE
*
* This file creation date: 07/02/2005 - 10:29:14
* The JForum Project
* http://www.jforum.net
*/
package net.jforum.repository;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import net.jforum.cache.CacheEngine;
import net.jforum.cache.Cacheable;
import net.jforum.dao.DataAccessDriver;
import net.jforum.dao.PostDAO;
import net.jforum.entities.Post;
import net.jforum.util.preferences.ConfigKeys;
import net.jforum.util.preferences.SystemGlobals;
import net.jforum.view.forum.common.PostCommon;
/**
* Repository for the post in the top n topics for each forum.
*
* @author Sean Mitchell
* @author Rafael Steil
* @version $Id: PostRepository.java,v 1.13 2006/08/23 02:13:48 rafaelsteil Exp $
*/
public class PostRepository implements Cacheable
{
private static final int CACHE_SIZE = SystemGlobals.getIntValue(ConfigKeys.POSTS_CACHE_SIZE);
private static final String FQN = "posts";
private static CacheEngine cache;
/**
* @see net.jforum.cache.Cacheable#setCacheEngine(net.jforum.cache.CacheEngine)
*/
public void setCacheEngine(CacheEngine engine)
{
cache = engine;
}
public static int size()
{
Map m = (Map)cache.get(FQN);
return (m != null ? m.size() : 0);
}
public static int size(int topicId)
{
List posts = (List)cache.get(FQN, Integer.toString(topicId));
return (posts == null ? 0 : posts.size());
}
public static Collection cachedTopics()
{
Map m = (Map)cache.get(FQN);
if (m == null) {
return new ArrayList();
}
return m.keySet();
}
public static List selectAllByTopicByLimit(int topicId, int start, int count)
{
String tid = Integer.toString(topicId);
List posts = (List)cache.get(FQN, tid);
if (posts == null || posts.size() == 0) {
PostDAO pm = DataAccessDriver.getInstance().newPostDAO();
posts = pm.selectAllByTopic(topicId);
for (Iterator iter = posts.iterator(); iter.hasNext(); ) {
PostCommon.preparePostForDisplay((Post)iter.next());
}
Map topics = (Map)cache.get(FQN);
if (topics == null || topics.size() == 0 || topics.size() < CACHE_SIZE) {
cache.add(FQN, tid, posts);
}
else {
if (!(topics instanceof LinkedHashMap)) {
topics = new LinkedHashMap(topics) {
protected boolean removeEldestEntry(java.util.Map.Entry eldest) {
return this.size() > CACHE_SIZE;
}
};
}
topics.put(tid, posts);
cache.add(FQN, topics);
}
}
int size = posts.size();
return posts.subList(start, (size < start + count) ? size : start + count);
}
public static void remove(int topicId, int postId)
{
synchronized (FQN) {
String tid = Integer.toString(topicId);
List posts = (List)cache.get(FQN, tid);
if (posts != null) {
Post p = new Post();
p.setId(postId);
posts.remove(p);
cache.add(FQN, tid, posts);
}
}
}
public static void update(int topicId, Post p)
{
String tid = Integer.toString(topicId);
List posts = (List)cache.get(FQN, tid);
if (posts != null && posts.contains(p)) {
posts.set(posts.indexOf(p), p);
cache.add(FQN, tid, posts);
}
}
public static void append(int topicId, Post p)
{
String tid = Integer.toString(topicId);
List posts = (List)cache.get(FQN, tid);
if (posts != null && !posts.contains(p)) {
posts.add(p);
cache.add(FQN, tid, posts);
}
}
public static void clearCache(int topicId)
{
cache.remove(FQN, Integer.toString(topicId));
}
}