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// Copyright (C) 2014 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.restapi.config;
import static com.google.common.collect.ImmutableList.toImmutableList;
import static com.google.gerrit.common.data.GlobalCapability.MAINTAIN_SERVER;
import static com.google.gerrit.common.data.GlobalCapability.VIEW_CACHES;
import static com.google.gerrit.server.config.CacheResource.cacheNameOf;
import static java.nio.charset.StandardCharsets.UTF_8;
import static java.util.stream.Collectors.joining;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheStats;
import com.google.common.collect.Streams;
import com.google.gerrit.extensions.annotations.RequiresAnyCapability;
import com.google.gerrit.extensions.registration.DynamicMap;
import com.google.gerrit.extensions.registration.Extension;
import com.google.gerrit.extensions.restapi.BinaryResult;
import com.google.gerrit.extensions.restapi.RestReadView;
import com.google.gerrit.server.cache.PersistentCache;
import com.google.gerrit.server.config.ConfigResource;
import com.google.inject.Inject;
import java.util.Map;
import java.util.TreeMap;
import java.util.stream.Stream;
import org.kohsuke.args4j.Option;
@RequiresAnyCapability({VIEW_CACHES, MAINTAIN_SERVER})
public class ListCaches implements RestReadView<ConfigResource> {
private final DynamicMap<Cache<?, ?>> cacheMap;
public enum OutputFormat {
LIST,
TEXT_LIST
}
@Option(name = "--format", usage = "output format")
private OutputFormat format;
public ListCaches setFormat(OutputFormat format) {
this.format = format;
return this;
}
@Inject
public ListCaches(DynamicMap<Cache<?, ?>> cacheMap) {
this.cacheMap = cacheMap;
}
public Map<String, CacheInfo> getCacheInfos() {
Map<String, CacheInfo> cacheInfos = new TreeMap<>();
for (Extension<Cache<?, ?>> e : cacheMap) {
cacheInfos.put(
cacheNameOf(e.getPluginName(), e.getExportName()), new CacheInfo(e.getProvider().get()));
}
return cacheInfos;
}
@Override
public Object apply(ConfigResource rsrc) {
if (format == null) {
return getCacheInfos();
}
Stream<String> cacheNames =
Streams.stream(cacheMap)
.map(e -> cacheNameOf(e.getPluginName(), e.getExportName()))
.sorted();
if (OutputFormat.TEXT_LIST.equals(format)) {
return BinaryResult.create(cacheNames.collect(joining("\n")))
.base64()
.setContentType("text/plain")
.setCharacterEncoding(UTF_8);
}
return cacheNames.collect(toImmutableList());
}
public enum CacheType {
MEM,
DISK
}
public static 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;
}
}
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);
}
private 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);
}
private static Integer percent(long value, long total) {
if (total <= 0) {
return null;
}
return (int) ((100 * value) / total);
}
}
}
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