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// Copyright 2008 Google Inc.
//
// 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.codereview.manager;
import com.google.codereview.util.GitMetaUtil;
import org.spearce.jgit.lib.Repository;
import java.io.File;
import java.io.IOException;
import java.lang.ref.Reference;
import java.lang.ref.SoftReference;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Pattern;
/** Cache of active Git repositories being used by the manager. */
public class RepositoryCache {
private static final Pattern REPO_NAME =
Pattern.compile("^[A-Za-z][A-Za-z0-9/_-]+$");
private final File base;
private final Map<String, Reference<Repository>> cache;
/**
* Create a new cache to manage a specific base directory (and below).
*
* @param basedir top level directory that contains all repositories.
*/
public RepositoryCache(final File basedir) {
base = basedir;
cache = new HashMap<String, Reference<Repository>>();
}
/**
* @return the base directory which contains all known repositories.
*/
public File getBaseDirectory() {
return base;
}
/**
* Get (or open) a repository by name.
*
* @param name the repository name, relative to the base directory supplied
* when the cache was created.
* @return the cached Repository instance.
* @throws InvalidRepositoryException the name does not denote an existing
* repository, or the name cannot be read as a repository.
*/
public synchronized Repository get(String name)
throws InvalidRepositoryException {
if (name.endsWith(".git")) {
name = name.substring(0, name.length() - 4);
}
if (!REPO_NAME.matcher(name).matches()) {
throw new InvalidRepositoryException(name);
}
final Reference<Repository> ref = cache.get(name);
Repository db = ref != null ? ref.get() : null;
if (db == null) {
try {
db = GitMetaUtil.open(new File(base, name));
if (db == null) {
throw new InvalidRepositoryException(name);
}
} catch (IOException err) {
throw new InvalidRepositoryException(name, err);
}
cache.put(name, new SoftReference<Repository>(db));
}
return db;
}
}
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