62 lines
1.5 KiB
Java
62 lines
1.5 KiB
Java
/*
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This file is part of Subsonic.
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Subsonic is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Subsonic is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Subsonic. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2009 (C) Sindre Mehus
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*/
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package org.moire.ultrasonic.util;
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import java.lang.ref.SoftReference;
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import java.util.concurrent.TimeUnit;
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/**
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* @author Sindre Mehus
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* @version $Id$
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*/
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public class TimeLimitedCache<T>
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{
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private SoftReference<T> value;
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private final long ttlMillis;
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private long expires;
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public TimeLimitedCache(long ttl, TimeUnit timeUnit)
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{
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this.ttlMillis = TimeUnit.MILLISECONDS.convert(ttl, timeUnit);
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}
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public T get()
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{
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return System.currentTimeMillis() < expires ? value.get() : null;
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}
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public void set(T value)
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{
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set(value, ttlMillis, TimeUnit.MILLISECONDS);
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}
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public void set(T value, long ttl, TimeUnit timeUnit)
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{
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this.value = new SoftReference<T>(value);
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expires = System.currentTimeMillis() + timeUnit.toMillis(ttl);
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}
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public void clear()
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{
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expires = 0L;
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value = null;
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}
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}
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