| /* |
| * Copyright (C) 2016, Google Inc. |
| * and other copyright owners as documented in the project's IP log. |
| * |
| * This program and the accompanying materials are made available |
| * under the terms of the Eclipse Distribution License v1.0 which |
| * accompanies this distribution, is reproduced below, and is |
| * available at http://www.eclipse.org/org/documents/edl-v10.php |
| * |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or |
| * without modification, are permitted provided that the following |
| * conditions are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * - Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials provided |
| * with the distribution. |
| * |
| * - Neither the name of the Eclipse Foundation, Inc. nor the |
| * names of its contributors may be used to endorse or promote |
| * products derived from this software without specific prior |
| * written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
| * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
| * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| package org.eclipse.jgit.internal.ketch; |
| |
| import java.net.URISyntaxException; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| import java.util.concurrent.locks.Lock; |
| import java.util.concurrent.locks.ReentrantLock; |
| |
| import org.eclipse.jgit.internal.storage.dfs.DfsRepository; |
| import org.eclipse.jgit.lib.Repository; |
| |
| /** |
| * A cache of live leader instances, keyed by repository. |
| * <p> |
| * Ketch only assigns a leader to a repository when needed. If |
| * {@link #get(Repository)} is called for a repository that does not have a |
| * leader, the leader is created and added to the cache. |
| */ |
| public class KetchLeaderCache { |
| private final KetchSystem system; |
| private final ConcurrentMap<String, KetchLeader> leaders; |
| private final Lock startLock; |
| |
| /** |
| * Initialize a new leader cache. |
| * |
| * @param system |
| * system configuration for the leaders |
| */ |
| public KetchLeaderCache(KetchSystem system) { |
| this.system = system; |
| leaders = new ConcurrentHashMap<>(); |
| startLock = new ReentrantLock(true /* fair */); |
| } |
| |
| /** |
| * Lookup the leader instance for a given repository. |
| * |
| * @param repo |
| * repository to get the leader for. |
| * @return the leader instance for the repository. |
| * @throws java.net.URISyntaxException |
| * remote configuration contains an invalid URL. |
| */ |
| public KetchLeader get(Repository repo) |
| throws URISyntaxException { |
| String key = computeKey(repo); |
| KetchLeader leader = leaders.get(key); |
| if (leader != null) { |
| return leader; |
| } |
| return startLeader(key, repo); |
| } |
| |
| private KetchLeader startLeader(String key, Repository repo) |
| throws URISyntaxException { |
| startLock.lock(); |
| try { |
| KetchLeader leader = leaders.get(key); |
| if (leader != null) { |
| return leader; |
| } |
| leader = system.createLeader(repo); |
| leaders.put(key, leader); |
| return leader; |
| } finally { |
| startLock.unlock(); |
| } |
| } |
| |
| private static String computeKey(Repository repo) { |
| if (repo instanceof DfsRepository) { |
| DfsRepository dfs = (DfsRepository) repo; |
| return dfs.getDescription().getRepositoryName(); |
| } |
| |
| if (repo.getDirectory() != null) { |
| return repo.getDirectory().toURI().toString(); |
| } |
| |
| throw new IllegalArgumentException(); |
| } |
| } |