org/sonews/feed/PushFeeder.java
author cli
Sun, 29 Aug 2010 17:04:25 +0200
changeset 34 9f0b95aafaa3
parent 22 2541bdb54cb2
permissions -rw-r--r--
Merge heads.
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/*
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 *   SONEWS News Server
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 *   see AUTHORS for the list of contributors
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 *
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 *   This program is free software: you can redistribute it and/or modify
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 *   it under the terms of the GNU General Public License as published by
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 *   the Free Software Foundation, either version 3 of the License, or
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 *   (at your option) any later version.
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 *
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 *   This program is distributed in the hope that it will be useful,
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 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *   GNU General Public License for more details.
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 *
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 *   You should have received a copy of the GNU General Public License
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 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 */
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package org.sonews.feed;
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import java.io.IOException;
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import java.util.List;
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import java.util.concurrent.ConcurrentLinkedQueue;
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import org.sonews.daemon.AbstractDaemon;
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import org.sonews.storage.Article;
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import org.sonews.storage.Headers;
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import org.sonews.storage.StorageBackendException;
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import org.sonews.storage.StorageManager;
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import org.sonews.util.Log;
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import org.sonews.util.io.ArticleWriter;
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/**
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 * Pushes new articles to remote newsservers. This feeder sleeps until a new
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 * message is posted to the sonews instance.
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 * @author Christian Lins
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 * @since sonews/0.5.0
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 */
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class PushFeeder extends AbstractDaemon
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{
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  private ConcurrentLinkedQueue<Article> articleQueue = 
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    new ConcurrentLinkedQueue<Article>();
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  @Override
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  public void run()
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  {
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    while(isRunning())
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    {
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      try
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      {
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        synchronized(this)
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        {
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          this.wait();
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        }
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        List<Subscription> subscriptions = StorageManager.current()
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          .getSubscriptions(FeedManager.TYPE_PUSH);
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        Article  article = this.articleQueue.poll();
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        String[] groups  = article.getHeader(Headers.NEWSGROUPS)[0].split(",");
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        Log.get().info("PushFeed: " + article.getMessageID());
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        for(Subscription sub : subscriptions)
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        {
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          // Circle check
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          if(article.getHeader(Headers.PATH)[0].contains(sub.getHost()))
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          {
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            Log.get().info(article.getMessageID() + " skipped for host "
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              + sub.getHost());
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            continue;
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          }
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          try
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          {
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            for(String group : groups)
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            {
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              if(sub.getGroup().equals(group))
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              {
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                // Delete headers that may cause problems
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                article.removeHeader(Headers.NNTP_POSTING_DATE);
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                article.removeHeader(Headers.NNTP_POSTING_HOST);
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                article.removeHeader(Headers.X_COMPLAINTS_TO);
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                article.removeHeader(Headers.X_TRACE);
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                article.removeHeader(Headers.XREF);
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                // POST the message to remote server
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                ArticleWriter awriter = new ArticleWriter(sub.getHost(), sub.getPort());
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                awriter.writeArticle(article);
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                break;
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              }
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            }
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          }
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          catch(IOException ex)
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          {
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            Log.get().warning(ex.toString());
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          }
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        }
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      }
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      catch(StorageBackendException ex)
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      {
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        Log.get().severe(ex.toString());
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      }
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      catch(InterruptedException ex)
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      {
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        Log.get().warning("PushFeeder interrupted: " + ex);
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      }
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    }
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  }
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  public void queueForPush(Article article)
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  {
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    this.articleQueue.add(article);
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    synchronized(this)
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    {
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      this.notifyAll();
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    }
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  }
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}