| // 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; |
| |
| package com.google.gerrit.server.git; |
| |
| import com.google.common.cache.CacheLoader; |
| import com.google.common.cache.LoadingCache; |
| import com.google.gerrit.extensions.events.GitReferenceUpdatedListener; |
| import com.google.gerrit.reviewdb.client.Change; |
| import com.google.gerrit.reviewdb.client.Project; |
| import com.google.gerrit.reviewdb.server.ReviewDb; |
| import com.google.gerrit.server.cache.CacheModule; |
| import com.google.gwtorm.server.SchemaFactory; |
| 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.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.concurrent.ExecutionException; |
| |
| @Singleton |
| public class ChangeCache implements GitReferenceUpdatedListener { |
| private static final Logger log = |
| LoggerFactory.getLogger(ChangeCache.class); |
| private static final String ID_CACHE = "changes"; |
| |
| public static Module module() { |
| return new CacheModule() { |
| @Override |
| protected void configure() { |
| cache(ID_CACHE, |
| Project.NameKey.class, |
| new TypeLiteral<List<Change>>() {}) |
| .maximumWeight(0) |
| .loader(Loader.class); |
| } |
| }; |
| } |
| |
| private final LoadingCache<Project.NameKey, List<Change>> cache; |
| |
| @Inject |
| ChangeCache(@Named(ID_CACHE) LoadingCache<Project.NameKey, List<Change>> cache) { |
| this.cache = cache; |
| } |
| |
| 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(); |
| } |
| } |
| |
| @Override |
| public void onGitReferenceUpdated(GitReferenceUpdatedListener.Event event) { |
| for (GitReferenceUpdatedListener.Update u : event.getUpdates()) { |
| if (u.getRefName().startsWith("refs/changes/")) { |
| cache.invalidate(new Project.NameKey(event.getProjectName())); |
| break; |
| } |
| } |
| } |
| |
| static class Loader extends CacheLoader<Project.NameKey, List<Change>> { |
| private final SchemaFactory<ReviewDb> schema; |
| |
| @Inject |
| Loader(SchemaFactory<ReviewDb> schema) { |
| this.schema = schema; |
| } |
| |
| @Override |
| public List<Change> load(Project.NameKey key) throws Exception { |
| final ReviewDb db = schema.open(); |
| try { |
| return Collections.unmodifiableList(db.changes().byProject(key).toList()); |
| } finally { |
| db.close(); |
| } |
| } |
| } |
| } |