| // Copyright (C) 2015 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 static com.google.gerrit.server.git.SearchingChangeCacheImpl.ID_CACHE; |
| |
| import com.google.common.cache.CacheLoader; |
| import com.google.common.cache.LoadingCache; |
| import com.google.common.collect.Iterables; |
| 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.cache.CacheModule; |
| import com.google.gerrit.server.util.ManualRequestContext; |
| import com.google.gerrit.server.util.OneOffRequestContext; |
| import com.google.inject.Inject; |
| import com.google.inject.Module; |
| import com.google.inject.Singleton; |
| import com.google.inject.TypeLiteral; |
| import com.google.inject.name.Named; |
| |
| import org.eclipse.jgit.lib.Ref; |
| import org.eclipse.jgit.lib.Repository; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.LinkedHashSet; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.concurrent.ExecutionException; |
| |
| @Singleton |
| public class ScanningChangeCacheImpl implements ChangeCache { |
| private static final Logger log = |
| LoggerFactory.getLogger(ScanningChangeCacheImpl.class); |
| |
| public static Module module() { |
| return new CacheModule() { |
| @Override |
| protected void configure() { |
| bind(ChangeCache.class).to(ScanningChangeCacheImpl.class); |
| cache(ID_CACHE, |
| Project.NameKey.class, |
| new TypeLiteral<List<Change>>() {}) |
| .maximumWeight(0) |
| .loader(Loader.class); |
| } |
| }; |
| } |
| |
| private final LoadingCache<Project.NameKey, List<Change>> cache; |
| |
| @Inject |
| ScanningChangeCacheImpl( |
| @Named(ID_CACHE) LoadingCache<Project.NameKey, List<Change>> cache) { |
| this.cache = cache; |
| } |
| |
| @Override |
| public List<Change> get(Project.NameKey name) { |
| try { |
| return cache.get(name); |
| } catch (ExecutionException e) { |
| log.warn("Cannot fetch changes for " + name, e); |
| return Collections.emptyList(); |
| } |
| } |
| |
| static class Loader extends CacheLoader<Project.NameKey, List<Change>> { |
| private final GitRepositoryManager repoManager; |
| private final OneOffRequestContext requestContext; |
| |
| @Inject |
| Loader(GitRepositoryManager repoManager, |
| OneOffRequestContext requestContext) { |
| this.repoManager = repoManager; |
| this.requestContext = requestContext; |
| } |
| |
| @Override |
| public List<Change> load(Project.NameKey key) throws Exception { |
| try (Repository repo = repoManager.openRepository(key); |
| ManualRequestContext ctx = requestContext.open()) { |
| ReviewDb db = ctx.getReviewDbProvider().get(); |
| Map<String, Ref> refs = |
| repo.getRefDatabase().getRefs(RefNames.REFS_CHANGES); |
| Set<Change.Id> ids = new LinkedHashSet<>(); |
| for (Ref r : refs.values()) { |
| Change.Id id = Change.Id.fromRef(r.getName()); |
| if (id != null) { |
| ids.add(id); |
| } |
| } |
| List<Change> changes = new ArrayList<>(ids.size()); |
| // A batch size of N may overload get(Iterable), so use something smaller, |
| // but still >1. |
| for (List<Change.Id> batch : Iterables.partition(ids, 30)) { |
| Iterables.addAll(changes, db.changes().get(batch)); |
| } |
| return changes; |
| } |
| } |
| |
| } |
| } |