package org.apache.cassandra.cache;
/*
*
* 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.
*
*/
import com.googlecode.concurrentlinkedhashmap.Weigher;
import com.googlecode.concurrentlinkedhashmap.Weighers;
import org.github.jamm.MemoryMeter;
public class ConcurrentLinkedHashCacheProvider implements IRowCacheProvider
{
public ICache<RowCacheKey, IRowCacheEntry> create(int capacity, boolean useMemoryWeigher)
{
return ConcurrentLinkedHashCache.create(capacity, useMemoryWeigher
? createMemoryWeigher()
: Weighers.<IRowCacheEntry>singleton());
}
private static Weigher<IRowCacheEntry> createMemoryWeigher()
{
return new Weigher<IRowCacheEntry>()
{
final MemoryMeter meter = new MemoryMeter();
public int weightOf(IRowCacheEntry value)
{
return (int) Math.min(meter.measure(value), Integer.MAX_VALUE);
}
};
}
}