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// Copyright (C) 2021 The Android Open Source Project
//
// 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.google.gerrit.server.cache;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheStats;
import com.google.gerrit.common.Nullable;
public class CacheInfo {
public String name;
public CacheType type;
public EntriesInfo entries;
public String averageGet;
public HitRatioInfo hitRatio;
public CacheInfo(Cache<?, ?> cache) {
this(null, cache);
}
public CacheInfo(String name, Cache<?, ?> cache) {
this.name = name;
CacheStats stat = cache.stats();
entries = new EntriesInfo();
entries.setMem(cache.size());
averageGet = duration(stat.averageLoadPenalty());
hitRatio = new HitRatioInfo();
hitRatio.setMem(stat.hitCount(), stat.requestCount());
if (cache instanceof PersistentCache) {
type = CacheType.DISK;
PersistentCache.DiskStats diskStats = ((PersistentCache) cache).diskStats();
entries.setDisk(diskStats.size());
entries.setSpace(diskStats.space());
hitRatio.setDisk(diskStats.hitCount(), diskStats.requestCount());
} else {
type = CacheType.MEM;
}
}
@Nullable
private static String duration(double ns) {
if (ns < 0.5) {
return null;
}
String suffix = "ns";
if (ns >= 1000.0) {
ns /= 1000.0;
suffix = "us";
}
if (ns >= 1000.0) {
ns /= 1000.0;
suffix = "ms";
}
if (ns >= 1000.0) {
ns /= 1000.0;
suffix = "s";
}
return String.format("%4.1f%s", ns, suffix).trim();
}
public static class EntriesInfo {
public Long mem;
public Long disk;
public String space;
public void setMem(long mem) {
this.mem = mem != 0 ? mem : null;
}
public void setDisk(long disk) {
this.disk = disk != 0 ? disk : null;
}
public void setSpace(double value) {
space = bytes(value);
}
public static String bytes(double value) {
value /= 1024;
String suffix = "k";
if (value > 1024) {
value /= 1024;
suffix = "m";
}
if (value > 1024) {
value /= 1024;
suffix = "g";
}
return String.format("%1$6.2f%2$s", value, suffix).trim();
}
}
public static class HitRatioInfo {
public Integer mem;
public Integer disk;
public void setMem(long value, long total) {
mem = percent(value, total);
}
public void setDisk(long value, long total) {
disk = percent(value, total);
}
@Nullable
private static Integer percent(long value, long total) {
if (total <= 0) {
return null;
}
return (int) ((100 * value) / total);
}
}
public enum CacheType {
MEM,
DISK
}
}