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// Copyright (C) 2012 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.git;
import com.google.auto.value.AutoValue;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.common.collect.ImmutableSet;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.extensions.events.GitReferenceUpdatedListener;
import com.google.gerrit.extensions.registration.DynamicSet;
import com.google.gerrit.reviewdb.client.Change;
import com.google.gerrit.reviewdb.client.Project;
import com.google.gerrit.reviewdb.client.RefNames;
import com.google.gerrit.reviewdb.server.ReviewDb;
import com.google.gerrit.server.ReviewerSet;
import com.google.gerrit.server.cache.CacheModule;
import com.google.gerrit.server.index.change.ChangeField;
import com.google.gerrit.server.query.change.ChangeData;
import com.google.gerrit.server.query.change.InternalChangeQuery;
import com.google.gerrit.server.util.ManualRequestContext;
import com.google.gerrit.server.util.OneOffRequestContext;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import com.google.inject.TypeLiteral;
import com.google.inject.name.Named;
import com.google.inject.util.Providers;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.ExecutionException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@Singleton
public class SearchingChangeCacheImpl implements GitReferenceUpdatedListener {
private static final Logger log = LoggerFactory.getLogger(SearchingChangeCacheImpl.class);
static final String ID_CACHE = "changes";
public static class Module extends CacheModule {
private final boolean slave;
public Module() {
this(false);
}
public Module(boolean slave) {
this.slave = slave;
}
@Override
protected void configure() {
if (slave) {
bind(SearchingChangeCacheImpl.class)
.toProvider(Providers.<SearchingChangeCacheImpl>of(null));
} else {
cache(ID_CACHE, Project.NameKey.class, new TypeLiteral<List<CachedChange>>() {})
.maximumWeight(0)
.loader(Loader.class);
bind(SearchingChangeCacheImpl.class);
DynamicSet.bind(binder(), GitReferenceUpdatedListener.class)
.to(SearchingChangeCacheImpl.class);
}
}
}
@AutoValue
abstract static class CachedChange {
// Subset of fields in ChangeData, specifically fields needed to serve
// VisibleRefFilter without touching the database. More can be added as
// necessary.
abstract Change change();
@Nullable
abstract ReviewerSet reviewers();
}
private final LoadingCache<Project.NameKey, List<CachedChange>> cache;
private final ChangeData.Factory changeDataFactory;
@Inject
SearchingChangeCacheImpl(
@Named(ID_CACHE) LoadingCache<Project.NameKey, List<CachedChange>> cache,
ChangeData.Factory changeDataFactory) {
this.cache = cache;
this.changeDataFactory = changeDataFactory;
}
/**
* Read changes for the project from the secondary index.
*
* <p>Returned changes only include the {@code Change} object (with id, branch) and the reviewers.
* Additional stored fields are not loaded from the index.
*
* @param db database handle to populate missing change data (probably unused).
* @param project project to read.
* @return list of known changes; empty if no changes.
*/
public List<ChangeData> getChangeData(ReviewDb db, Project.NameKey project) {
try {
List<CachedChange> cached = cache.get(project);
List<ChangeData> cds = new ArrayList<>(cached.size());
for (CachedChange cc : cached) {
ChangeData cd = changeDataFactory.create(db, cc.change());
cd.setReviewers(cc.reviewers());
cds.add(cd);
}
return Collections.unmodifiableList(cds);
} catch (ExecutionException e) {
log.warn("Cannot fetch changes for " + project, e);
return Collections.emptyList();
}
}
@Override
public void onGitReferenceUpdated(GitReferenceUpdatedListener.Event event) {
if (event.getRefName().startsWith(RefNames.REFS_CHANGES)) {
cache.invalidate(new Project.NameKey(event.getProjectName()));
}
}
static class Loader extends CacheLoader<Project.NameKey, List<CachedChange>> {
private final OneOffRequestContext requestContext;
private final Provider<InternalChangeQuery> queryProvider;
@Inject
Loader(OneOffRequestContext requestContext, Provider<InternalChangeQuery> queryProvider) {
this.requestContext = requestContext;
this.queryProvider = queryProvider;
}
@Override
public List<CachedChange> load(Project.NameKey key) throws Exception {
try (ManualRequestContext ctx = requestContext.open()) {
List<ChangeData> cds =
queryProvider
.get()
.setRequestedFields(
ImmutableSet.of(ChangeField.CHANGE.getName(), ChangeField.REVIEWER.getName()))
.byProject(key);
List<CachedChange> result = new ArrayList<>(cds.size());
for (ChangeData cd : cds) {
result.add(
new AutoValue_SearchingChangeCacheImpl_CachedChange(cd.change(), cd.getReviewers()));
}
return Collections.unmodifiableList(result);
}
}
}
}
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