briar/components/net/sf/briar/db/DatabaseCleanerImpl.java

package net.sf.briar.db;

import java.util.Timer;
import java.util.TimerTask;
import java.util.logging.Level;
import java.util.logging.Logger;

import net.sf.briar.api.db.DbException;

class DatabaseCleanerImpl extends TimerTask implements DatabaseCleaner {

	private static final Logger LOG =
			Logger.getLogger(DatabaseCleanerImpl.class.getName());

	private volatile Callback callback = null;
	private volatile Timer timer = null;

	public void startCleaning(Callback callback, long msBetweenSweeps) {
		this.callback = callback;
		timer = new Timer();
		timer.scheduleAtFixedRate(this, 0L, msBetweenSweeps);
	}

	public void stopCleaning() {
		if(timer == null) throw new IllegalStateException();
		timer.cancel();
	}

	public void run() {
		if(callback == null) throw new IllegalStateException();
		try {
			if(callback.shouldCheckFreeSpace()) {
				callback.checkFreeSpaceAndClean();
			}
		} catch(DbException e) {
			if(LOG.isLoggable(Level.WARNING))
				LOG.warning(e.toString());
			throw new Error(e); // Kill the application
		} catch(RuntimeException e) {
			if(LOG.isLoggable(Level.WARNING))
				LOG.warning(e.toString());
			throw new Error(e); // Kill the application
		}
	}
}