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package dk.thoerup.traininfoservice; |
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import java.util.Timer; |
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import java.util.TimerTask; |
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import java.util.logging.Logger; |
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import javax.servlet.ServletContext; |
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import javax.servlet.ServletContextEvent; |
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import javax.servlet.ServletContextListener; |
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import javax.servlet.annotation.WebListener; |
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@WebListener |
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public class StatisticsListener implements ServletContextListener { |
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Logger log = Logger.getLogger(StatisticsListener.class.getName()); |
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Timer timer = null; |
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int update_interval; |
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public void contextInitialized(ServletContextEvent sce) { |
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update_interval = getUpdateInterval( sce.getServletContext() ); |
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log.info("StatisticsListener::contextInit called update_interval=" + update_interval); |
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if ( update_interval > 0 ) { |
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timer = new Timer(); |
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TimerTask statsUpdate = new TimerTask() { |
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@Override |
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public void run() { |
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Statistics.getInstance().saveStats(); |
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} |
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}; |
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timer.schedule(statsUpdate, 0, update_interval); |
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} |
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} |
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public void contextDestroyed(ServletContextEvent sce) { |
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log.info("StatisticsListener::contextDestroyed"); |
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if ( update_interval > 0 ) { |
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timer.cancel(); |
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Statistics.getInstance().saveStats(); |
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} |
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} |
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private int getUpdateInterval(ServletContext cntx) { |
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int interval = 0; |
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try { |
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String intervalStr = cntx.getInitParameter("stats_interval"); |
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interval = Integer.parseInt(intervalStr); |
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} catch (Exception e) {} |
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return interval; |
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} |
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} |