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/*
This file is part of Subsonic.
Subsonic is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Subsonic 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with Subsonic. If not, see <http://www.gnu.org/licenses/>.
Copyright 2009 (C) Sindre Mehus
*/
package github.daneren2005.dsub.util;
import java.lang.ref.SoftReference;
import java.util.concurrent.TimeUnit;
/**
* @author Sindre Mehus
* @version $Id$
*/
public class TimeLimitedCache<T> {
private SoftReference<T> value;
private final long ttlMillis;
private long expires;
public TimeLimitedCache(long ttl, TimeUnit timeUnit) {
this.ttlMillis = TimeUnit.MILLISECONDS.convert(ttl, timeUnit);
}
public T get() {
return System.currentTimeMillis() < expires ? value.get() : null;
}
public void set(T value) {
set(value, ttlMillis, TimeUnit.MILLISECONDS);
}
public void set(T value, long ttl, TimeUnit timeUnit) {
this.value = new SoftReference<T>(value);
expires = System.currentTimeMillis() + timeUnit.toMillis(ttl);
}
public void clear() {
expires = 0L;
value = null;
}
}
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