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/**
* ConcurrentARH
* an interface for Adaptive Replacement Handles
* Copyright 2014 by Michael Peter Christen, mc@yacy.net, Frankfurt a. M., Germany
* First released 15.01.2014 at http://yacy.net
*
* 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; either
* version 2.1 of the License, or (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program in the file lgpl21.txt
* If not, see <http://www.gnu.org/licenses/>.
*/
package net.yacy.cora.storage;
import java.util.AbstractSet;
import java.util.Iterator;
import java.util.Set;
/**
* An ARH is set for handles in respect to the ARC construction: an Adaptive Replacement Handle Cache.
*/
public class ConcurrentARH<K> extends AbstractSet<K> implements Set<K>, Iterable<K>, ARH<K> {
private static final Object _EXIST = new Object();
private final ConcurrentARC<K, Object> cache;
public ConcurrentARH(final int cacheSize, final int partitions) {
this.cache = new ConcurrentARC<K, Object>(cacheSize, partitions);
}
@Override
public int size() {
return this.cache.size();
}
@Override
public boolean contains(Object o) {
return this.cache.containsKey(o);
}
@Override
public void clear() {
this.cache.clear();
}
@Override
public Set<K> set() {
return this.cache.keySet();
}
@Override
public Iterator<K> iterator() {
return this.cache.keySet().iterator();
}
@Override
public boolean isEmpty() {
return this.cache.isEmpty();
}
@Override
public boolean add(K e) {
Object o = this.cache.put(e, _EXIST);
return o == null;
}
@Override
public void delete(Object o) {
this.cache.remove(o);
}
}
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