/*
* Copyright 2015 Ben Manes. 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.github.benmanes.caffeine.cache.simulator.policy;
import static java.util.Objects.requireNonNull;
import com.google.common.base.MoreObjects;
import com.google.common.base.Stopwatch;
/**
* Statistics gathered by a policy execution.
*
* @author ben.manes@gmail.com (Ben Manes)
*/
public final class PolicyStats {
private final String name;
private final Stopwatch stopwatch;
private long hitCount;
private long missCount;
private long evictionCount;
private long admittedCount;
private long rejectedCount;
private long operationCount;
public PolicyStats(String name) {
this.name = requireNonNull(name);
this.stopwatch = Stopwatch.createUnstarted();
}
public Stopwatch stopwatch() {
return stopwatch;
}
public String name() {
return name;
}
public void recordOperation() {
operationCount++;
}
public long operationCount() {
return operationCount;
}
public void addOperations(long operations) {
operationCount += operations;
}
public void recordHit() {
hitCount++;
}
public long hitCount() {
return hitCount;
}
public void addHits(long hits) {
hitCount += hits;
}
public void recordMiss() {
missCount++;
}
public long missCount() {
return missCount;
}
public void addMisses(long misses) {
missCount += misses;
}
public long evictionCount() {
return evictionCount;
}
public void recordEviction() {
evictionCount++;
}
public void addEvictions(long evictions) {
evictionCount += evictions;
}
public long requestCount() {
return hitCount + missCount;
}
public long admissionCount() {
return admittedCount;
}
public void recordAdmission() {
admittedCount++;
}
public long rejectionCount() {
return rejectedCount;
}
public void recordRejection() {
rejectedCount++;
}
public double hitRate() {
long requestCount = requestCount();
return (requestCount == 0) ? 1.0 : (double) hitCount / requestCount;
}
public double missRate() {
long requestCount = requestCount();
return (requestCount == 0) ? 0.0 : (double) missCount / requestCount;
}
public double admissionRate() {
double candidateCount = admittedCount + rejectedCount;
return (candidateCount == 0) ? 1.0 : admittedCount / candidateCount;
}
public double complexity() {
long requestCount = requestCount();
return (requestCount == 0) ? 0.0 : (double) operationCount / requestCount;
}
@Override
public String toString() {
return MoreObjects.toStringHelper(this).addValue(name).toString();
}
}