For anyone who might be interested, this is what I ended up with for a
scheduler:
public class AServletContextListener implements ServletContextListener
{
private ScheduledExecutorService executor;
/**
* Constructs AServletContextListener object.
*/
public AServletContextListener()
{
}
/**
* Invoked when context is initialized.
*
* @param sce triggering ServletContextEvent
*/
public void contextInitialized( ServletContextEvent sce )
{
if ( executor == null )
{
executor = Executors.newSingleThreadScheduledExecutor();
Calendar firstRunTime = new GregorianCalendar();
firstRunTime.set( Calendar.HOUR_OF_DAY, 12 );
firstRunTime.set( Calendar.MINUTE, 0 );
firstRunTime.set( Calendar.SECOND, 0 );
firstRunTime.set( Calendar.MILLISECOND, 0 );
executor.scheduleAtFixedRate(
new ARunnable(),
firstRunTime.getTimeInMillis() -
System.currentTimeMillis(),
1000 * 60 * 60 * 24,
TimeUnit.MILLISECONDS );
}
}
/**
* Invoked when context is destroyed.
*
* @param sce triggering ServletContextEvent
*/
public void contextDestroyed( ServletContextEvent sce )
{
if ( executor != null )
{
boolean isTerminated = false;
executor.shutdown();
do
{
try
{
isTerminated = executor.awaitTermination(
1, TimeUnit.SECONDS );
}
catch ( InterruptedException ignore )
{
}
}
while ( !isTerminated );
executor = null;
Thread.yield();
}
}
}
Thanks for all the suggestions and pointers.
-Terence
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