/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.wicket.pageStore.memory;
import org.apache.wicket.util.lang.Args;
import org.apache.wicket.util.lang.Bytes;
import org.apache.wicket.core.util.lang.WicketObjects;
/**
* An eviction strategy that keeps the data store size up to configured bytes
*/
public class MemorySizeEvictionStrategy implements IDataStoreEvictionStrategy
{
private final Bytes maxBytes;
/**
* Construct.
*
* @param maxBytes
* the maximum size of the data store
*/
public MemorySizeEvictionStrategy(Bytes maxBytes)
{
Args.notNull(maxBytes, "maxBytes");
this.maxBytes = maxBytes;
}
/**
*
* @see IDataStoreEvictionStrategy#evict(org.apache.wicket.pageStore.memory.PageTable)
*/
@Override
public void evict(PageTable pageTable)
{
long storeCurrentSize = WicketObjects.sizeof(pageTable);
if (storeCurrentSize > maxBytes.bytes())
{
PageTableCleaner cleaner = new PageTableCleaner();
cleaner.drop(pageTable, 1);
// recurse until enough space is cleaned
evict(pageTable);
}
}
}