org/sonews/util/Stats.java
author cli
Sun, 09 May 2010 12:38:46 +0200
changeset 30 146b3275b792
parent 16 5a4a41cfc0a3
child 31 087ef6fe6a1a
permissions -rw-r--r--
The StorageBackendException is catched two times so that the user see the "500 internal server error" only at the second catch (probably fixes #5).
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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.util;
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import java.util.Calendar;
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import org.sonews.config.Config;
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import org.sonews.storage.Channel;
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import org.sonews.storage.StorageBackendException;
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import org.sonews.storage.StorageManager;
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/**
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 * Class that capsulates statistical data gathering.
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 * @author Christian Lins
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 * @since sonews/0.5.0
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 */
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public final class Stats 
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{
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  public static final byte CONNECTIONS    = 1;
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  public static final byte POSTED_NEWS    = 2;
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  public static final byte GATEWAYED_NEWS = 3;
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  public static final byte FEEDED_NEWS    = 4;
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  public static final byte MLGW_RUNSTART  = 5;
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  public static final byte MLGW_RUNEND    = 6;
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  private static Stats instance = new Stats();
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  public static Stats getInstance()
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  {
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    return Stats.instance;
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  }
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  private Stats() {}
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  private volatile int connectedClients = 0;
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  /**
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   * A generic method that writes event data to the storage backend.
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   * If event logging is disabled with sonews.eventlog=false this method
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   * simply does nothing.
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   * @param type
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   * @param groupname
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   */
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  private void addEvent(byte type, String groupname)
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  {
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    if(Config.inst().get(Config.EVENTLOG, true))
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    {
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      Channel group = Channel.getByName(groupname);
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      if(group != null)
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      {
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        try
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        {
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          StorageManager.current().addEvent(
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            System.currentTimeMillis(), type, group.getInternalID());
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        }
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        catch(StorageBackendException ex)
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        {
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          ex.printStackTrace();
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        }
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      }
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      else
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      {
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        Log.get().info("Group " + groupname + " does not exist.");
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      }
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    }
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  }
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  public void clientConnect()
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  {
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    this.connectedClients++;
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  }
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  public void clientDisconnect()
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  {
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    this.connectedClients--;
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  }
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  public int connectedClients()
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  {
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    return this.connectedClients;
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  }
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  public int getNumberOfGroups()
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  {
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    try
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    {
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      return StorageManager.current().countGroups();
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    }
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    catch(StorageBackendException ex)
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    {
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      ex.printStackTrace();
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      return -1;
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    }
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  }
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  public int getNumberOfNews()
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  {
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    try
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    {
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      return StorageManager.current().countArticles();
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    }
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    catch(StorageBackendException ex)
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    {
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      ex.printStackTrace();
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      return -1;
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    }
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  }
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  public int getYesterdaysEvents(final byte eventType, final int hour,
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    final Channel group)
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  {
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    // Determine the timestamp values for yesterday and the given hour
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    Calendar cal = Calendar.getInstance();
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    int year  = cal.get(Calendar.YEAR);
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    int month = cal.get(Calendar.MONTH);
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    int dayom = cal.get(Calendar.DAY_OF_MONTH) - 1; // Yesterday
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    cal.set(year, month, dayom, hour, 0, 0);
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    long startTimestamp = cal.getTimeInMillis();
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    cal.set(year, month, dayom, hour + 1, 0, 0);
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    long endTimestamp = cal.getTimeInMillis();
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    try
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    {
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      return StorageManager.current()
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        .getEventsCount(eventType, startTimestamp, endTimestamp, group);
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    }
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    catch(StorageBackendException ex)
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    {
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      ex.printStackTrace();
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      return -1;
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    }
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  }
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  public void mailPosted(String groupname)
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  {
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    addEvent(POSTED_NEWS, groupname);
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  }
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  public void mailGatewayed(String groupname)
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  {
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    addEvent(GATEWAYED_NEWS, groupname);
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  }
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  public void mailFeeded(String groupname)
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  {
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    addEvent(FEEDED_NEWS, groupname);
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  }
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  public void mlgwRunStart()
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  {
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    addEvent(MLGW_RUNSTART, "control");
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  }
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  public void mlgwRunEnd()
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  {
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    addEvent(MLGW_RUNEND, "control");
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  }
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  private double perHour(int key, long gid)
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  {
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    try
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    {
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      return StorageManager.current().getEventsPerHour(key, gid);
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    }
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    catch(StorageBackendException ex)
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    {
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      ex.printStackTrace();
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      return -1;
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    }
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  }
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  public double postedPerHour(long gid)
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  {
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    return perHour(POSTED_NEWS, gid);
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  }
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  public double gatewayedPerHour(long gid)
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  {
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    return perHour(GATEWAYED_NEWS, gid);
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  }
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  public double feededPerHour(long gid)
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  {
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    return perHour(FEEDED_NEWS, gid);
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  }
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}