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Adding license place holder, adding NightlyDefragement.java

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bdc34 2010-10-18 20:02:24 +00:00
parent 5951f16be0
commit f3064fcf23
2 changed files with 82 additions and 0 deletions
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2
webapp/src/edu/cornell/mannlib/vitro/webapp/servlet/setup/HeapDefragement.java
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/* $This file is distributed under the terms of the license in /doc/license.txt$ */
package edu.cornell.mannlib.vitro.webapp.servlet.setup;
import javax.servlet.ServletContextEvent;

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webapp/src/edu/cornell/mannlib/vitro/webapp/servlet/setup/NightlyDefragement.java Normal file
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/* $This file is distributed under the terms of the license in /doc/license.txt$ */
package edu.cornell.mannlib.vitro.webapp.servlet.setup;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.joda.time.DateTime;
/**
* This will attempt to run System.gc() once a night.
*
* @author bdc34
*
*/
public class NightlyDefragement implements ServletContextListener, Runnable {
private static NightlyDefragement nightlyDefragement = null;
private static boolean stop = false;
private static final Log log = LogFactory.getLog(NightlyDefragement.class);
protected DateTime lastRun;
@Override
public void run() {
while( ! stop ){
DateTime now = new DateTime();
if( now.hourOfDay().get() > 0
&& now.hourOfDay().get() < 2
&& lastRun.isBefore( now.minusHours(22) ) ){
log.info("running defragement");
long start = System.currentTimeMillis();
System.gc();
log.info("Finished defragement, " + (start - System.currentTimeMillis()) + "msec");
lastRun = now;
}
try{
synchronized( nightlyDefragement ){
this.wait(30*60*1000); //30 min;
}
}catch( InterruptedException ex){
log.debug("woken up");
}
}
log.info(" Stopping NightlyDefragement thread.");
}
public void stopNicely(){
stop = true;
synchronized( nightlyDefragement ){
nightlyDefragement.notifyAll();
}
}
@Override
public void contextInitialized(ServletContextEvent arg0) {
lastRun = new DateTime().minusHours( 400 );
if( nightlyDefragement != null ){
log.warn("NightlyDefragement listener has already been setup. Check your web.xml for duplicate listeners.");
}else{
nightlyDefragement = this;
Thread thread = new Thread(this , "nightlyDefragementThread");
thread.start();
}
}
@Override
public void contextDestroyed(ServletContextEvent arg0) {
nightlyDefragement.stopNicely();
}
}