| // 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.gerrit.git; |
| |
| 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; |
| } |
| } |