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// Copyright (C) 2020 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.config;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.gerrit.entities.RefNames;
import com.google.gerrit.exceptions.StorageException;
import com.google.gerrit.server.cache.CacheModule;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.inject.Inject;
import com.google.inject.Module;
import com.google.inject.Singleton;
import com.google.inject.name.Named;
import java.io.IOException;
import java.util.concurrent.ExecutionException;
import org.eclipse.jgit.errors.ConfigInvalidException;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
@Singleton
public class DefaultPreferencesCacheImpl implements DefaultPreferencesCache {
private static final String NAME = "default_preferences";
public static Module module() {
return new CacheModule() {
@Override
protected void configure() {
// Bind an in-memory cache that allows exactly 1 value to be cached.
cache(NAME, ObjectId.class, CachedPreferences.class).loader(Loader.class).maximumWeight(1);
bind(DefaultPreferencesCacheImpl.class);
bind(DefaultPreferencesCache.class).to(DefaultPreferencesCacheImpl.class);
}
};
}
private final GitRepositoryManager repositoryManager;
private final AllUsersName allUsersName;
private final LoadingCache<ObjectId, CachedPreferences> cache;
@Inject
DefaultPreferencesCacheImpl(
GitRepositoryManager repositoryManager,
AllUsersName allUsersName,
@Named(NAME) LoadingCache<ObjectId, CachedPreferences> cache) {
this.repositoryManager = repositoryManager;
this.allUsersName = allUsersName;
this.cache = cache;
}
@Override
public CachedPreferences get() {
try (Repository allUsersRepo = repositoryManager.openRepository(allUsersName)) {
Ref ref = allUsersRepo.exactRef(RefNames.REFS_USERS_DEFAULT);
if (ref == null) {
return EMPTY;
}
return get(ref.getObjectId());
} catch (IOException e) {
throw new StorageException(e);
}
}
@Override
public CachedPreferences get(ObjectId rev) {
try {
return cache.get(rev);
} catch (ExecutionException e) {
throw new StorageException(e);
}
}
@Singleton
private static class Loader extends CacheLoader<ObjectId, CachedPreferences> {
private final GitRepositoryManager repositoryManager;
private final AllUsersName allUsersName;
@Inject
Loader(GitRepositoryManager repositoryManager, AllUsersName allUsersName) {
this.repositoryManager = repositoryManager;
this.allUsersName = allUsersName;
}
@Override
public CachedPreferences load(ObjectId key) throws IOException, ConfigInvalidException {
try (Repository allUsersRepo = repositoryManager.openRepository(allUsersName)) {
VersionedDefaultPreferences versionedDefaultPreferences = new VersionedDefaultPreferences();
versionedDefaultPreferences.load(allUsersName, allUsersRepo, key);
return CachedPreferences.fromLegacyConfig(versionedDefaultPreferences.getConfig());
}
}
}
}