/*
* Copyright 2004-2023 H2 Group. Multiple-Licensed under the MPL 2.0,
* and the EPL 1.0 (https://h2database.com/html/license.html).
* Initial Developer: Jan Kotek
*/
package org.h2.util;
import java.util.ArrayList;
import java.util.Map;
/**
* Cache which wraps another cache (proxy pattern) and adds caching using map.
* This is useful for WeakReference, SoftReference or hard reference cache.
*/
class CacheSecondLevel implements Cache {
private final Cache baseCache;
private final Map<Integer, CacheObject> map;
CacheSecondLevel(Cache cache, Map<Integer, CacheObject> map) {
this.baseCache = cache;
this.map = map;
}
@Override
public void clear() {
map.clear();
baseCache.clear();
}
@Override
public CacheObject find(int pos) {
CacheObject ret = baseCache.find(pos);
if (ret == null) {
ret = map.get(pos);
}
return ret;
}
@Override
public CacheObject get(int pos) {
CacheObject ret = baseCache.get(pos);
if (ret == null) {
ret = map.get(pos);
}
return ret;
}
@Override
public ArrayList<CacheObject> getAllChanged() {
return baseCache.getAllChanged();
}
@Override
public int getMaxMemory() {
return baseCache.getMaxMemory();
}
@Override
public int getMemory() {
return baseCache.getMemory();
}
@Override
public void put(CacheObject r) {
baseCache.put(r);
map.put(r.getPos(), r);
}
@Override
public boolean remove(int pos) {
boolean result = baseCache.remove(pos);
result |= map.remove(pos) != null;
return result;
}
@Override
public void setMaxMemory(int size) {
baseCache.setMaxMemory(size);
}
@Override
public CacheObject update(int pos, CacheObject record) {
CacheObject oldRec = baseCache.update(pos, record);
map.put(pos, record);
return oldRec;
}
}