/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.ngrinder.home.service;
import com.sun.syndication.feed.synd.SyndEntryImpl;
import com.sun.syndication.feed.synd.SyndFeed;
import com.sun.syndication.io.SyndFeedInput;
import com.sun.syndication.io.XmlReader;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;
import org.ngrinder.home.model.PanelEntry;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Component;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import static org.ngrinder.common.util.TypeConvertUtils.cast;
/**
* nGrinder index page data retrieval service.
*
* @author JunHo Yoon
* @since 3.1
*/
@Component
public class HomeService {
private static final int PANEL_ENTRY_SIZE = 6;
private static final Logger LOG = LoggerFactory.getLogger(HomeService.class);
/**
* Get the let panel entries from the given feed RUL.
*
* @param feedURL feed url
* @return the list of {@link PanelEntry}
*/
@SuppressWarnings("unchecked")
@Cacheable(value = "left_panel_entries")
public List<PanelEntry> getLeftPanelEntries(String feedURL) {
return getPanelEntries(feedURL, PANEL_ENTRY_SIZE, false);
}
/**
* Get the right panel entries containing the entries from the given RSS
* url.
*
* @param feedURL rss url message
* @return {@link PanelEntry} list
*/
@Cacheable(value = "right_panel_entries")
public List<PanelEntry> getRightPanelEntries(String feedURL) {
return getPanelEntries(feedURL, PANEL_ENTRY_SIZE, true);
}
/**
* Get panel entries containing the entries from the given RSS
* url.
*
* @param feedURL rss url message
* @param maxSize max size
* @param includeReply if including reply
* @return {@link PanelEntry} list
*/
public List<PanelEntry> getPanelEntries(String feedURL, int maxSize, boolean includeReply) {
SyndFeedInput input = new SyndFeedInput();
XmlReader reader = null;
HttpURLConnection feedConnection = null;
try {
List<PanelEntry> panelEntries = new ArrayList<PanelEntry>();
URL url = new URL(feedURL);
feedConnection = (HttpURLConnection) url.openConnection();
feedConnection.setConnectTimeout(4000);
feedConnection.setReadTimeout(4000);
reader = new XmlReader(feedConnection);
SyndFeed feed = input.build(reader);
int count = 0;
for (Object eachObj : feed.getEntries()) {
SyndEntryImpl each = cast(eachObj);
if (!includeReply && StringUtils.startsWithIgnoreCase(each.getTitle(), "Re: ")) {
continue;
}
if (count++ > maxSize) {
break;
}
PanelEntry entry = new PanelEntry();
entry.setAuthor(each.getAuthor());
entry.setLastUpdatedDate(each.getUpdatedDate() == null ? each.getPublishedDate() : each
.getUpdatedDate());
entry.setTitle(each.getTitle());
entry.setLink(each.getLink());
panelEntries.add(entry);
}
Collections.sort(panelEntries);
return panelEntries;
} catch (Exception e) {
LOG.error("Error while patching the feed entries for {} : {}", feedURL, e.getMessage());
} finally {
if (feedConnection != null) {
feedConnection.disconnect();
}
IOUtils.closeQuietly(reader);
}
return Collections.emptyList();
}
}