com.liferay.portlet.rss.util.RSSWebCacheItem.java Source code

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Here is the source code for com.liferay.portlet.rss.util.RSSWebCacheItem.java

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/**
 * Copyright (c) 2000-2012 Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library 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 Lesser General Public License for more
 * details.
 */

package com.liferay.portlet.rss.util;

import com.liferay.portal.kernel.util.HttpUtil;
import com.liferay.portal.kernel.util.Time;
import com.liferay.portal.kernel.webcache.WebCacheException;
import com.liferay.portal.kernel.webcache.WebCacheItem;
import com.liferay.portal.util.HttpImpl;
import com.liferay.portal.util.PropsValues;

import com.sun.syndication.feed.synd.SyndFeed;
import com.sun.syndication.io.SyndFeedInput;
import com.sun.syndication.io.XmlReader;

import org.apache.commons.httpclient.HostConfiguration;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpClientParams;

/**
 * @author Brian Wing Shun Chan
 */
public class RSSWebCacheItem implements WebCacheItem {

    public RSSWebCacheItem(String url) {
        _url = url;
    }

    public Object convert(String key) throws WebCacheException {
        SyndFeed feed = null;

        try {

            // com.liferay.portal.kernel.util.HttpUtil will break the connection
            // if it spends more than 5 seconds looking up a location. However,
            // German umlauts do not get encoded correctly. This may be a bug
            // with commons-httpclient or with how FeedParser uses
            // java.io.Reader.

            // Use http://xml.newsisfree.com/feeds/29/629.xml and
            // http://test.domosoft.com/up/RSS to test if German umlauts show
            // up correctly.

            /*Reader reader = new StringReader(
               new String(HttpUtil.URLtoByteArray(_url)));
                
            channel = FeedParser.parse(builder, reader);*/

            HttpImpl httpImpl = (HttpImpl) HttpUtil.getHttp();

            HostConfiguration hostConfiguration = httpImpl.getHostConfiguration(_url);

            HttpClient httpClient = httpImpl.getClient(hostConfiguration);

            httpImpl.proxifyState(httpClient.getState(), hostConfiguration);

            HttpClientParams httpClientParams = httpClient.getParams();

            httpClientParams.setConnectionManagerTimeout(PropsValues.RSS_CONNECTION_TIMEOUT);
            httpClientParams.setSoTimeout(PropsValues.RSS_CONNECTION_TIMEOUT);

            GetMethod getMethod = new GetMethod(_url);

            httpClient.executeMethod(hostConfiguration, getMethod);

            SyndFeedInput input = new SyndFeedInput();

            feed = input.build(new XmlReader(getMethod.getResponseBodyAsStream()));
        } catch (Exception e) {
            throw new WebCacheException(_url + " " + e.toString());
        }

        return feed;
    }

    public long getRefreshTime() {
        return _REFRESH_TIME;
    }

    private static final long _REFRESH_TIME = Time.MINUTE * 20;

    private String _url;

}