// Copyright (C) 2008 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.project;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.common.collect.Sets;
import com.google.gerrit.reviewdb.client.Project;
import com.google.gerrit.server.cache.CacheModule;
import com.google.gerrit.server.config.AllProjectsName;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.git.ProjectConfig;
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.Repository;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Collections;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.SortedSet;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
/** Cache of project information, including access rights. */
@Singleton
public class ProjectCacheImpl implements ProjectCache {
private static final Logger log = LoggerFactory
.getLogger(ProjectCacheImpl.class);
private static final String CACHE_NAME = "projects";
private static final String CACHE_LIST = "project_list";
public static Module module() {
return new CacheModule() {
@Override
protected void configure() {
cache(CACHE_NAME, String.class, ProjectState.class)
.loader(Loader.class);
cache(CACHE_LIST,
ListKey.class,
new TypeLiteral<SortedSet<Project.NameKey>>() {})
.maximumWeight(1)
.loader(Lister.class);
bind(ProjectCacheImpl.class);
bind(ProjectCache.class).to(ProjectCacheImpl.class);
}
};
}
private final AllProjectsName allProjectsName;
private final LoadingCache<String, ProjectState> byName;
private final LoadingCache<ListKey, SortedSet<Project.NameKey>> list;
private final Lock listLock;
private final ProjectCacheClock clock;
@Inject
ProjectCacheImpl(
final AllProjectsName allProjectsName,
@Named(CACHE_NAME) LoadingCache<String, ProjectState> byName,
@Named(CACHE_LIST) LoadingCache<ListKey, SortedSet<Project.NameKey>> list,
ProjectCacheClock clock) {
this.allProjectsName = allProjectsName;
this.byName = byName;
this.list = list;
this.listLock = new ReentrantLock(true /* fair */);
this.clock = clock;
}
@Override
public ProjectState getAllProjects() {
ProjectState state = get(allProjectsName);
if (state == null) {
// This should never occur, the server must have this
// project to process anything.
throw new IllegalStateException("Missing project " + allProjectsName);
}
return state;
}
/**
* Get the cached data for a project by its unique name.
*
* @param projectName name of the project.
* @return the cached data; null if no such project exists.
*/
public ProjectState get(final Project.NameKey projectName) {
if (projectName == null) {
return null;
}
try {
ProjectState state = byName.get(projectName.get());
if (state != null && state.needsRefresh(clock.read())) {
byName.invalidate(projectName.get());
state = byName.get(projectName.get());
}
return state;
} catch (ExecutionException e) {
log.warn(String.format("Cannot read project %s", projectName.get()), e);
return null;
}
}
/** Invalidate the cached information about the given project. */
public void evict(final Project p) {
if (p != null) {
byName.invalidate(p.getNameKey().get());
}
}
@Override
public void remove(final Project p) {
listLock.lock();
try {
SortedSet<Project.NameKey> n = Sets.newTreeSet(list.get(ListKey.ALL));
n.remove(p.getNameKey());
list.put(ListKey.ALL, Collections.unmodifiableSortedSet(n));
} catch (ExecutionException e) {
log.warn("Cannot list avaliable projects", e);
} finally {
listLock.unlock();
}
evict(p);
}
@Override
public void onCreateProject(Project.NameKey newProjectName) {
listLock.lock();
try {
SortedSet<Project.NameKey> n = Sets.newTreeSet(list.get(ListKey.ALL));
n.add(newProjectName);
list.put(ListKey.ALL, Collections.unmodifiableSortedSet(n));
} catch (ExecutionException e) {
log.warn("Cannot list avaliable projects", e);
} finally {
listLock.unlock();
}
}
@Override
public Iterable<Project.NameKey> all() {
try {
return list.get(ListKey.ALL);
} catch (ExecutionException e) {
log.warn("Cannot list available projects", e);
return Collections.emptyList();
}
}
@Override
public Iterable<Project.NameKey> byName(final String pfx) {
final Iterable<Project.NameKey> src;
try {
src = list.get(ListKey.ALL).tailSet(new Project.NameKey(pfx));
} catch (ExecutionException e) {
return Collections.emptyList();
}
return new Iterable<Project.NameKey>() {
@Override
public Iterator<Project.NameKey> iterator() {
return new Iterator<Project.NameKey>() {
private Iterator<Project.NameKey> itr = src.iterator();
private Project.NameKey next;
@Override
public boolean hasNext() {
if (next != null) {
return true;
}
if (!itr.hasNext()) {
return false;
}
Project.NameKey r = itr.next();
if (r.get().startsWith(pfx)) {
next = r;
return true;
} else {
itr = Collections.<Project.NameKey> emptyList().iterator();
return false;
}
}
@Override
public Project.NameKey next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
Project.NameKey r = next;
next = null;
return r;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
};
}
};
}
static class Loader extends CacheLoader<String, ProjectState> {
private final ProjectState.Factory projectStateFactory;
private final GitRepositoryManager mgr;
@Inject
Loader(ProjectState.Factory psf, GitRepositoryManager g) {
projectStateFactory = psf;
mgr = g;
}
@Override
public ProjectState load(String projectName) throws Exception {
Project.NameKey key = new Project.NameKey(projectName);
Repository git = mgr.openRepository(key);
try {
ProjectConfig cfg = new ProjectConfig(key);
cfg.load(git);
return projectStateFactory.create(cfg);
} finally {
git.close();
}
}
}
static class ListKey {
static final ListKey ALL = new ListKey();
private ListKey() {
}
}
static class Lister extends CacheLoader<ListKey, SortedSet<Project.NameKey>> {
private final GitRepositoryManager mgr;
@Inject
Lister(GitRepositoryManager mgr) {
this.mgr = mgr;
}
@Override
public SortedSet<Project.NameKey> load(ListKey key) throws Exception {
return mgr.list();
}
}
}