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- /*
- * 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.io.IOException;
- import java.util.concurrent.TimeoutException;
-
- import org.eclipse.jgit.errors.MissingObjectException;
- import org.eclipse.jgit.generated.storage.dht.proto.GitStore.RefData;
- import org.eclipse.jgit.lib.ObjectId;
- import org.eclipse.jgit.lib.Ref;
- import org.eclipse.jgit.lib.RefUpdate;
- import org.eclipse.jgit.revwalk.RevObject;
- import org.eclipse.jgit.revwalk.RevTag;
- import org.eclipse.jgit.revwalk.RevWalk;
- import org.eclipse.jgit.storage.dht.DhtRefDatabase.DhtRef;
- import org.eclipse.jgit.storage.dht.spi.Database;
-
- class DhtRefUpdate extends RefUpdate {
- private final DhtRefDatabase refdb;
-
- private final RepositoryKey repo;
-
- private final Database db;
-
- private RefKey refKey;
-
- private RefData oldData;
-
- private RefData newData;
-
- private Ref dstRef;
-
- private RevWalk rw;
-
- DhtRefUpdate(DhtRefDatabase refdb, RepositoryKey repo, Database db, Ref ref) {
- super(ref);
- this.refdb = refdb;
- this.repo = repo;
- this.db = db;
- }
-
- @Override
- protected DhtRefDatabase getRefDatabase() {
- return refdb;
- }
-
- @Override
- protected DhtRepository getRepository() {
- return refdb.getRepository();
- }
-
- @Override
- public Result update(RevWalk walk) throws IOException {
- try {
- rw = walk;
- return super.update(walk);
- } finally {
- rw = null;
- }
- }
-
- @Override
- protected boolean tryLock(boolean deref) throws IOException {
- dstRef = getRef();
- if (deref)
- dstRef = dstRef.getLeaf();
-
- refKey = RefKey.create(repo, dstRef.getName());
- oldData = ((DhtRef) dstRef).getRefData();
-
- if (dstRef.isSymbolic())
- setOldObjectId(null);
- else
- setOldObjectId(dstRef.getObjectId());
-
- return true;
- }
-
- @Override
- protected void unlock() {
- // No state is held while "locked".
- }
-
- @Override
- protected Result doUpdate(Result desiredResult) throws IOException {
- try {
- newData = newData();
- boolean r = db.ref().compareAndPut(refKey, oldData, newData);
- if (r) {
- getRefDatabase().stored(dstRef.getName(), newData);
- return desiredResult;
- } else {
- getRefDatabase().clearCache();
- return Result.LOCK_FAILURE;
- }
- } catch (TimeoutException e) {
- return Result.IO_FAILURE;
- }
- }
-
- @Override
- protected Result doDelete(Result desiredResult) throws IOException {
- try {
- boolean r = db.ref().compareAndRemove(refKey, oldData);
- if (r) {
- getRefDatabase().removed(dstRef.getName());
- return desiredResult;
- } else {
- getRefDatabase().clearCache();
- return Result.LOCK_FAILURE;
- }
- } catch (TimeoutException e) {
- return Result.IO_FAILURE;
- }
- }
-
- @Override
- protected Result doLink(String target) throws IOException {
- try {
- RefData.Builder d = RefData.newBuilder(oldData);
- clearRefData(d);
- updateSequence(d);
- d.setSymref(target);
- newData = d.build();
- boolean r = db.ref().compareAndPut(refKey, oldData, newData);
- if (r) {
- getRefDatabase().stored(dstRef.getName(), newData);
- if (getRef().getStorage() == Ref.Storage.NEW)
- return Result.NEW;
- return Result.FORCED;
- } else {
- getRefDatabase().clearCache();
- return Result.LOCK_FAILURE;
- }
- } catch (TimeoutException e) {
- return Result.IO_FAILURE;
- }
- }
-
- private RefData newData() throws IOException {
- RefData.Builder d = RefData.newBuilder(oldData);
- clearRefData(d);
- updateSequence(d);
-
- ObjectId newId = getNewObjectId();
- d.getTargetBuilder().setObjectName(newId.name());
- try {
- DhtReader ctx = (DhtReader) rw.getObjectReader();
- RevObject obj = rw.parseAny(newId);
-
- ChunkKey oKey = ctx.findChunk(newId);
- if (oKey != null)
- d.getTargetBuilder().setChunkKey(oKey.asString());
-
- if (obj instanceof RevTag) {
- ObjectId pId = rw.peel(obj);
- ChunkKey pKey = ctx.findChunk(pId);
- if (pKey != null)
- d.getPeeledBuilder().setChunkKey(pKey.asString());
- d.getPeeledBuilder().setObjectName(pId.name());
- }
- } catch (MissingObjectException e) {
- // Automatic peeling failed. Ignore the problem and deal with it
- // during reading later, this is the classical Git behavior on disk.
- }
- return d.build();
- }
-
- private static void clearRefData(RefData.Builder d) {
- // Clear fields individually rather than discarding the RefData.
- // This way implementation specific extensions are carried
- // through from the old version to the new version.
- d.clearSymref();
- d.clearTarget();
- d.clearPeeled();
- d.clearIsPeeled();
- }
-
- private static void updateSequence(RefData.Builder d) {
- d.setSequence(d.getSequence() + 1);
- }
- }
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