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The RefTree graph needs to be quickly accessed to read references. It is also distinct graph disconnected from the rest of the repository. Store the commit and tree objects in their own pack. Change-Id: Icbb735be8fa91ccbf0708ca3a219b364e11a6b83stable-4.3
Shawn Pearce
9 years ago
4 changed files with 197 additions and 33 deletions
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/* |
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* Copyright (C) 2016, Google Inc. |
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* and other copyright owners as documented in the project's IP log. |
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* |
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* This program and the accompanying materials are made available |
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* under the terms of the Eclipse Distribution License v1.0 which |
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* accompanies this distribution, is reproduced below, and is |
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* available at http://www.eclipse.org/org/documents/edl-v10.php
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* |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or |
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* without modification, are permitted provided that the following |
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* conditions are met: |
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* |
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* - Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* - Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer in the documentation and/or other materials provided |
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* with the distribution. |
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* |
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* - Neither the name of the Eclipse Foundation, Inc. nor the |
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* names of its contributors may be used to endorse or promote |
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* products derived from this software without specific prior |
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* written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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package org.eclipse.jgit.internal.storage.reftree; |
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import static org.eclipse.jgit.lib.RefDatabase.ALL; |
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import java.io.IOException; |
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import java.util.ArrayList; |
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import java.util.Collection; |
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import java.util.List; |
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import org.eclipse.jgit.lib.Ref; |
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import org.eclipse.jgit.lib.RefDatabase; |
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/** Magic reference name logic for RefTrees. */ |
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public class RefTreeNames { |
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/** |
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* Suffix used on a {@link RefTreeDatabase#getTxnNamespace()} for user data. |
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* <p> |
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* A {@link RefTreeDatabase}'s namespace may include a subspace (e.g. |
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* {@code "refs/txn/stage/"}) containing commit objects from the usual user |
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* portion of the repository (e.g. {@code "refs/heads/"}). These should be |
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* packed by the garbage collector alongside other user content rather than |
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* with the RefTree. |
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*/ |
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private static final String STAGE = "stage/"; //$NON-NLS-1$
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/** |
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* Determine if the reference is likely to be a RefTree. |
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* |
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* @param refdb |
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* database instance. |
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* @param ref |
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* reference name. |
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* @return {@code true} if the reference is a RefTree. |
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*/ |
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public static boolean isRefTree(RefDatabase refdb, String ref) { |
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if (refdb instanceof RefTreeDatabase) { |
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RefTreeDatabase b = (RefTreeDatabase) refdb; |
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if (ref.equals(b.getTxnCommitted())) { |
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return true; |
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} |
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String namespace = b.getTxnNamespace(); |
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if (namespace != null |
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&& ref.startsWith(namespace) |
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&& !ref.startsWith(namespace + STAGE)) { |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* Snapshot all references from a RefTreeDatabase and its bootstrap. |
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* <p> |
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* There may be name conflicts with multiple {@link Ref} objects containing |
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* the same name in the returned collection. |
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* |
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* @param refdb |
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* database instance. |
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* @return all known references. |
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* @throws IOException |
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* references cannot be enumerated. |
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*/ |
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public static Collection<Ref> allRefs(RefDatabase refdb) |
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throws IOException { |
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Collection<Ref> refs = refdb.getRefs(ALL).values(); |
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if (!(refdb instanceof RefTreeDatabase)) { |
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return refs; |
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} |
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RefDatabase bootstrap = ((RefTreeDatabase) refdb).getBootstrap(); |
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Collection<Ref> br = bootstrap.getRefs(ALL).values(); |
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List<Ref> all = new ArrayList<>(refs.size() + br.size()); |
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all.addAll(refs); |
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all.addAll(br); |
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return all; |
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} |
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private RefTreeNames() { |
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} |
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} |
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