| /* |
| * Copyright (C) 2011, 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.storage.dht; |
| |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.LinkedHashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| |
| import org.eclipse.jgit.lib.AnyObjectId; |
| import org.eclipse.jgit.lib.ObjectId; |
| |
| final class RecentInfoCache { |
| private final Map<ObjectId, List<ObjectInfo>> infoCache; |
| |
| RecentInfoCache(DhtReaderOptions options) { |
| final int sz = options.getRecentInfoCacheSize(); |
| infoCache = new LinkedHashMap<ObjectId, List<ObjectInfo>>(sz, 0.75f, true) { |
| private static final long serialVersionUID = 1L; |
| |
| @Override |
| protected boolean removeEldestEntry(Entry<ObjectId, List<ObjectInfo>> e) { |
| return sz < size(); |
| } |
| }; |
| } |
| |
| List<ObjectInfo> get(AnyObjectId id) { |
| return infoCache.get(id); |
| } |
| |
| void put(AnyObjectId id, List<ObjectInfo> info) { |
| infoCache.put(id.copy(), copyList(info)); |
| } |
| |
| private static List<ObjectInfo> copyList(List<ObjectInfo> info) { |
| int cnt = info.size(); |
| if (cnt == 1) |
| return Collections.singletonList(info.get(0)); |
| |
| ObjectInfo[] tmp = info.toArray(new ObjectInfo[cnt]); |
| return Collections.unmodifiableList(Arrays.asList(tmp)); |
| } |
| |
| void clear() { |
| infoCache.clear(); |
| } |
| } |