com.hazelcast.map.impl.NearCacheSizeEstimator Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2015, Hazelcast, Inc. All Rights Reserved.
*
* Licensed 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 com.hazelcast.map.impl;
import java.util.concurrent.atomic.AtomicLongFieldUpdater;
/**
* Size estimator for near cache.
*/
class NearCacheSizeEstimator
implements SizeEstimator {
private static final AtomicLongFieldUpdater SIZE_UPDATER = AtomicLongFieldUpdater
.newUpdater(NearCacheSizeEstimator.class, "size");
private volatile long size;
protected NearCacheSizeEstimator() {
super();
}
@Override
public long getCost(NearCacheRecord record) {
// immediate check nothing to do if record is null
if (record == null) {
return 0;
}
final long cost = record.getCost();
// if cost is zero, type of cached object is not Data.
// then omit.
if (cost == 0) {
return 0;
}
final int numberOfIntegers = 4;
long size = 0;
// entry size in CHM
size += numberOfIntegers * ((Integer.SIZE / Byte.SIZE));
size += cost;
return size;
}
@Override
public long getSize() {
return size;
}
public void add(long size) {
SIZE_UPDATER.addAndGet(this, size);
}
public void reset() {
SIZE_UPDATER.set(this, 0L);
}
}