| /* |
| * Copyright (C) 2010, Constantine Plotnikov <constantine.plotnikov@gmail.com> |
| * Copyright (C) 2010, JetBrains s.r.o. |
| * 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.storage.file; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.util.Collection; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.eclipse.jgit.internal.storage.file.ObjectDirectory.AlternateHandle; |
| import org.eclipse.jgit.internal.storage.pack.ObjectToPack; |
| import org.eclipse.jgit.internal.storage.pack.PackWriter; |
| import org.eclipse.jgit.lib.AbbreviatedObjectId; |
| import org.eclipse.jgit.lib.AnyObjectId; |
| import org.eclipse.jgit.lib.Config; |
| import org.eclipse.jgit.lib.Constants; |
| import org.eclipse.jgit.lib.ObjectDatabase; |
| import org.eclipse.jgit.lib.ObjectId; |
| import org.eclipse.jgit.lib.ObjectIdOwnerMap; |
| import org.eclipse.jgit.lib.ObjectLoader; |
| import org.eclipse.jgit.util.FS; |
| |
| /** |
| * The cached instance of an {@link ObjectDirectory}. |
| * <p> |
| * This class caches the list of loose objects in memory, so the file system is |
| * not queried with stat calls. |
| */ |
| class CachedObjectDirectory extends FileObjectDatabase { |
| /** |
| * The set that contains unpacked objects identifiers, it is created when |
| * the cached instance is created. |
| */ |
| private ObjectIdOwnerMap<UnpackedObjectId> unpackedObjects; |
| |
| private final ObjectDirectory wrapped; |
| |
| private CachedObjectDirectory[] alts; |
| |
| /** |
| * The constructor |
| * |
| * @param wrapped |
| * the wrapped database |
| */ |
| CachedObjectDirectory(ObjectDirectory wrapped) { |
| this.wrapped = wrapped; |
| this.unpackedObjects = scanLoose(); |
| } |
| |
| private ObjectIdOwnerMap<UnpackedObjectId> scanLoose() { |
| ObjectIdOwnerMap<UnpackedObjectId> m = new ObjectIdOwnerMap<>(); |
| File objects = wrapped.getDirectory(); |
| String[] fanout = objects.list(); |
| if (fanout == null) |
| return m; |
| for (String d : fanout) { |
| if (d.length() != 2) |
| continue; |
| String[] entries = new File(objects, d).list(); |
| if (entries == null) |
| continue; |
| for (String e : entries) { |
| if (e.length() != Constants.OBJECT_ID_STRING_LENGTH - 2) |
| continue; |
| try { |
| ObjectId id = ObjectId.fromString(d + e); |
| m.add(new UnpackedObjectId(id)); |
| } catch (IllegalArgumentException notAnObject) { |
| // ignoring the file that does not represent loose object |
| } |
| } |
| } |
| return m; |
| } |
| |
| @Override |
| public void close() { |
| // Don't close anything. |
| } |
| |
| @Override |
| public ObjectDatabase newCachedDatabase() { |
| return this; |
| } |
| |
| @Override |
| File getDirectory() { |
| return wrapped.getDirectory(); |
| } |
| |
| @Override |
| File fileFor(AnyObjectId id) { |
| return wrapped.fileFor(id); |
| } |
| |
| @Override |
| Config getConfig() { |
| return wrapped.getConfig(); |
| } |
| |
| @Override |
| FS getFS() { |
| return wrapped.getFS(); |
| } |
| |
| @Override |
| Set<ObjectId> getShallowCommits() throws IOException { |
| return wrapped.getShallowCommits(); |
| } |
| |
| private CachedObjectDirectory[] myAlternates() { |
| if (alts == null) { |
| ObjectDirectory.AlternateHandle[] src = wrapped.myAlternates(); |
| alts = new CachedObjectDirectory[src.length]; |
| for (int i = 0; i < alts.length; i++) |
| alts[i] = src[i].db.newCachedFileObjectDatabase(); |
| } |
| return alts; |
| } |
| |
| private Set<AlternateHandle.Id> skipMe(Set<AlternateHandle.Id> skips) { |
| Set<AlternateHandle.Id> withMe = new HashSet<>(); |
| if (skips != null) { |
| withMe.addAll(skips); |
| } |
| withMe.add(getAlternateId()); |
| return withMe; |
| } |
| |
| @Override |
| void resolve(Set<ObjectId> matches, AbbreviatedObjectId id) |
| throws IOException { |
| wrapped.resolve(matches, id); |
| } |
| |
| @Override |
| public boolean has(final AnyObjectId objectId) throws IOException { |
| return has(objectId, null); |
| } |
| |
| private boolean has(final AnyObjectId objectId, Set<AlternateHandle.Id> skips) |
| throws IOException { |
| if (unpackedObjects.contains(objectId)) { |
| return true; |
| } |
| if (wrapped.hasPackedObject(objectId)) { |
| return true; |
| } |
| skips = skipMe(skips); |
| for (CachedObjectDirectory alt : myAlternates()) { |
| if (!skips.contains(alt.getAlternateId())) { |
| if (alt.has(objectId, skips)) { |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| ObjectLoader openObject(final WindowCursor curs, final AnyObjectId objectId) |
| throws IOException { |
| return openObject(curs, objectId, null); |
| } |
| |
| private ObjectLoader openObject(final WindowCursor curs, |
| final AnyObjectId objectId, Set<AlternateHandle.Id> skips) |
| throws IOException { |
| ObjectLoader ldr = openLooseObject(curs, objectId); |
| if (ldr != null) { |
| return ldr; |
| } |
| ldr = wrapped.openPackedObject(curs, objectId); |
| if (ldr != null) { |
| return ldr; |
| } |
| skips = skipMe(skips); |
| for (CachedObjectDirectory alt : myAlternates()) { |
| if (!skips.contains(alt.getAlternateId())) { |
| ldr = alt.openObject(curs, objectId, skips); |
| if (ldr != null) { |
| return ldr; |
| } |
| } |
| } |
| return null; |
| } |
| |
| @Override |
| long getObjectSize(WindowCursor curs, AnyObjectId objectId) |
| throws IOException { |
| // Object size is unlikely to be requested from contexts using |
| // this type. Don't bother trying to accelerate the lookup. |
| return wrapped.getObjectSize(curs, objectId); |
| } |
| |
| @Override |
| ObjectLoader openLooseObject(WindowCursor curs, AnyObjectId id) |
| throws IOException { |
| if (unpackedObjects.contains(id)) { |
| ObjectLoader ldr = wrapped.openLooseObject(curs, id); |
| if (ldr != null) |
| return ldr; |
| unpackedObjects = scanLoose(); |
| } |
| return null; |
| } |
| |
| @Override |
| InsertLooseObjectResult insertUnpackedObject(File tmp, ObjectId objectId, |
| boolean createDuplicate) throws IOException { |
| InsertLooseObjectResult result = wrapped.insertUnpackedObject(tmp, |
| objectId, createDuplicate); |
| switch (result) { |
| case INSERTED: |
| case EXISTS_LOOSE: |
| unpackedObjects.addIfAbsent(new UnpackedObjectId(objectId)); |
| break; |
| |
| case EXISTS_PACKED: |
| case FAILURE: |
| break; |
| } |
| return result; |
| } |
| |
| @Override |
| PackFile openPack(File pack) throws IOException { |
| return wrapped.openPack(pack); |
| } |
| |
| @Override |
| void selectObjectRepresentation(PackWriter packer, ObjectToPack otp, |
| WindowCursor curs) throws IOException { |
| wrapped.selectObjectRepresentation(packer, otp, curs); |
| } |
| |
| @Override |
| Collection<PackFile> getPacks() { |
| return wrapped.getPacks(); |
| } |
| |
| private static class UnpackedObjectId extends ObjectIdOwnerMap.Entry { |
| UnpackedObjectId(AnyObjectId id) { |
| super(id); |
| } |
| } |
| |
| private AlternateHandle.Id getAlternateId() { |
| return wrapped.getAlternateId(); |
| } |
| } |