com.hazelcast.map.impl.BinaryMapEntryCostEstimator Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2020, 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 com.hazelcast.config.InMemoryFormat;
import com.hazelcast.map.impl.record.Record;
import com.hazelcast.nio.serialization.Data;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import static com.hazelcast.util.JVMUtil.REFERENCE_COST_IN_BYTES;
/**
* Owned entry cost estimator for maps which have {@link InMemoryFormat#BINARY} memory-format.
*/
class BinaryMapEntryCostEstimator
implements EntryCostEstimator {
private static final int HASH_ENTRY_HASH_COST_IN_BYTES = REFERENCE_COST_IN_BYTES;
private static final int HASH_ENTRY_VALUE_REF_COST_IN_BYTES = REFERENCE_COST_IN_BYTES;
private static final int HASH_ENTRY_KEY_REF_COST_IN_BYTES = REFERENCE_COST_IN_BYTES;
private static final int HASH_ENTRY_NEXT_REF_COST_IN_BYTES = REFERENCE_COST_IN_BYTES;
private static final int HASH_ENTRY_COST_IN_BYTES =
HASH_ENTRY_HASH_COST_IN_BYTES + HASH_ENTRY_KEY_REF_COST_IN_BYTES
+ HASH_ENTRY_VALUE_REF_COST_IN_BYTES + HASH_ENTRY_NEXT_REF_COST_IN_BYTES;
private volatile long estimate;
BinaryMapEntryCostEstimator() {
}
@Override
public long getEstimate() {
return estimate;
}
@SuppressFBWarnings(value = "VO_VOLATILE_INCREMENT",
justification = "We have the guarantee that only a single partition thread at any given time can change the volatile"
+ " field, but multiple threads can read it.")
@Override
public void adjustEstimateBy(long adjustment) {
this.estimate += adjustment;
}
@Override
public void reset() {
estimate = 0L;
}
@Override
public long calculateValueCost(Record value) {
return value.getCost();
}
public long calculateEntryCost(Data key, Record value) {
long totalMapEntryCost = 0L;
totalMapEntryCost += HASH_ENTRY_COST_IN_BYTES;
totalMapEntryCost += key.getHeapCost();
totalMapEntryCost += value.getCost();
return totalMapEntryCost;
}
}