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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.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.common.flogger.FluentLogger;
import com.google.gerrit.server.config.GerritServerConfig;
import com.google.gerrit.server.config.SitePaths;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import org.eclipse.jgit.lib.Config;
/**
* Base class for persistent cache factory. If the cache.directory property is unset, or disk limit
* is zero or negative, it will fall back to in-memory only caches.
*/
public abstract class PersistentCacheBaseFactory implements PersistentCacheFactory {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
protected final MemoryCacheFactory memCacheFactory;
protected final Path cacheDir;
protected boolean diskEnabled;
protected final Config config;
public PersistentCacheBaseFactory(
MemoryCacheFactory memCacheFactory, @GerritServerConfig Config config, SitePaths site) {
this.cacheDir = getCacheDir(site, config.getString("cache", null, "directory"));
this.diskEnabled = cacheDir != null;
this.memCacheFactory = memCacheFactory;
this.config = config;
}
protected abstract <K, V> Cache<K, V> buildImpl(PersistentCacheDef<K, V> in, long diskLimit);
protected abstract <K, V> LoadingCache<K, V> buildImpl(
PersistentCacheDef<K, V> in, CacheLoader<K, V> loader, long diskLimit);
@Override
public <K, V> Cache<K, V> build(PersistentCacheDef<K, V> in) {
long limit = getDiskLimit(in);
if (isInMemoryCache(limit)) {
return memCacheFactory.build(in);
}
return buildImpl(in, limit);
}
@Override
public <K, V> LoadingCache<K, V> build(PersistentCacheDef<K, V> in, CacheLoader<K, V> loader) {
long limit = getDiskLimit(in);
if (isInMemoryCache(limit)) {
return memCacheFactory.build(in, loader);
}
return buildImpl(in, loader, limit);
}
private <K, V> long getDiskLimit(PersistentCacheDef<K, V> in) {
return config.getLong("cache", in.configKey(), "diskLimit", in.diskLimit());
}
private <K, V> boolean isInMemoryCache(long diskLimit) {
return !diskEnabled || diskLimit <= 0;
}
private static Path getCacheDir(SitePaths site, String name) {
if (name == null) {
return null;
}
Path loc = site.resolve(name);
if (!Files.exists(loc)) {
try {
Files.createDirectories(loc);
} catch (IOException e) {
logger.atWarning().log("Can't create disk cache: %s", loc.toAbsolutePath());
return null;
}
}
if (!Files.isWritable(loc)) {
logger.atWarning().log("Can't write to disk cache: %s", loc.toAbsolutePath());
return null;
}
logger.atInfo().log("Enabling disk cache %s", loc.toAbsolutePath());
return loc;
}
}
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