- /*
- * 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.storage.file;
-
- import java.io.File;
- import java.io.IOException;
- import java.util.Set;
-
- import org.eclipse.jgit.lib.AbbreviatedObjectId;
- import org.eclipse.jgit.lib.AnyObjectId;
- import org.eclipse.jgit.lib.Constants;
- import org.eclipse.jgit.lib.ObjectDatabase;
- import org.eclipse.jgit.lib.ObjectId;
- import org.eclipse.jgit.lib.ObjectIdSubclassMap;
- import org.eclipse.jgit.lib.ObjectLoader;
- import org.eclipse.jgit.storage.pack.ObjectToPack;
- import org.eclipse.jgit.storage.pack.PackWriter;
-
- /**
- * 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 final ObjectIdSubclassMap<ObjectId> unpackedObjects = new ObjectIdSubclassMap<ObjectId>();
-
- private final ObjectDirectory wrapped;
-
- private AlternateHandle[] alts;
-
- /**
- * The constructor
- *
- * @param wrapped
- * the wrapped database
- */
- CachedObjectDirectory(ObjectDirectory wrapped) {
- this.wrapped = wrapped;
-
- File objects = wrapped.getDirectory();
- String[] fanout = objects.list();
- if (fanout == null)
- fanout = new String[0];
- 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 {
- unpackedObjects.add(ObjectId.fromString(d + e));
- } catch (IllegalArgumentException notAnObject) {
- // ignoring the file that does not represent loose object
- }
- }
- }
- }
-
- @Override
- public void close() {
- // Don't close anything.
- }
-
- @Override
- public ObjectDirectoryInserter newInserter() {
- return wrapped.newInserter();
- }
-
- @Override
- public ObjectDatabase newCachedDatabase() {
- return this;
- }
-
- @Override
- FileObjectDatabase newCachedFileObjectDatabase() {
- return this;
- }
-
- @Override
- File getDirectory() {
- return wrapped.getDirectory();
- }
-
- @Override
- AlternateHandle[] myAlternates() {
- if (alts == null) {
- AlternateHandle[] src = wrapped.myAlternates();
- alts = new AlternateHandle[src.length];
- for (int i = 0; i < alts.length; i++) {
- FileObjectDatabase s = src[i].db;
- alts[i] = new AlternateHandle(s.newCachedFileObjectDatabase());
- }
- }
- return alts;
- }
-
- @Override
- void resolve(Set<ObjectId> matches, AbbreviatedObjectId id)
- throws IOException {
- // In theory we could accelerate the loose object scan using our
- // unpackedObjects map, but its not worth the huge code complexity.
- // Scanning a single loose directory is fast enough, and this is
- // unlikely to be called anyway.
- //
- wrapped.resolve(matches, id);
- }
-
- @Override
- boolean tryAgain1() {
- return wrapped.tryAgain1();
- }
-
- @Override
- public boolean has(final AnyObjectId objectId) {
- return hasObjectImpl1(objectId);
- }
-
- @Override
- boolean hasObject1(AnyObjectId objectId) {
- return unpackedObjects.contains(objectId)
- || wrapped.hasObject1(objectId);
- }
-
- @Override
- ObjectLoader openObject(final WindowCursor curs,
- final AnyObjectId objectId) throws IOException {
- return openObjectImpl1(curs, objectId);
- }
-
- @Override
- ObjectLoader openObject1(WindowCursor curs, AnyObjectId objectId)
- throws IOException {
- if (unpackedObjects.contains(objectId))
- return wrapped.openObject2(curs, objectId.name(), objectId);
- return wrapped.openObject1(curs, objectId);
- }
-
- @Override
- boolean hasObject2(String objectId) {
- // This method should never be invoked.
- throw new UnsupportedOperationException();
- }
-
- @Override
- ObjectLoader openObject2(WindowCursor curs, String objectName,
- AnyObjectId objectId) throws IOException {
- // This method should never be invoked.
- throw new UnsupportedOperationException();
- }
-
- @Override
- long getObjectSize1(WindowCursor curs, AnyObjectId objectId) throws IOException {
- if (unpackedObjects.contains(objectId))
- return wrapped.getObjectSize2(curs, objectId.name(), objectId);
- return wrapped.getObjectSize1(curs, objectId);
- }
-
- @Override
- long getObjectSize2(WindowCursor curs, String objectName, AnyObjectId objectId)
- throws IOException {
- // This method should never be invoked.
- throw new UnsupportedOperationException();
- }
-
- @Override
- InsertLooseObjectResult insertUnpackedObject(File tmp, ObjectId objectId,
- boolean createDuplicate) {
- InsertLooseObjectResult result = wrapped.insertUnpackedObject(tmp,
- objectId, createDuplicate);
- switch (result) {
- case INSERTED:
- case EXISTS_LOOSE:
- if (!unpackedObjects.contains(objectId))
- unpackedObjects.add(objectId);
- break;
-
- case EXISTS_PACKED:
- case FAILURE:
- break;
- }
- return result;
- }
-
- @Override
- void selectObjectRepresentation(PackWriter packer, ObjectToPack otp,
- WindowCursor curs) throws IOException {
- wrapped.selectObjectRepresentation(packer, otp, curs);
- }
- }
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