/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2002-2008, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
package org.geotools.data.directory;
import java.io.File;
/**
* Performs a last updated check each time isStale is called. Accurate, but will
* incur in scalability issues under heavy multithreaded load on servers (file
* access is typically expensive as it requires a switch to kernel space)
*
* @author Andrea Aime
*
*/
class ImmediateDirectoryWatcher implements DirectoryWatcher {
File directory;
Long lastUpdated;
public ImmediateDirectoryWatcher(File directory) {
this.directory = directory;
}
public synchronized boolean isStale() {
return lastUpdated == null || lastUpdated < directory.lastModified();
}
public synchronized void mark() {
lastUpdated = directory.lastModified();
}
}