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Merge "reftable: split off generic code from DFS code"

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Jonathan Tan 5 years ago committed by Gerrit Code Review @ Eclipse.org
parent
3b96aeb2c9 2b1e942729
commit
88bd901492
5 changed files with 721 additions and 372 deletions
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  1. 41
      org.eclipse.jgit.http.test/src/org/eclipse/jgit/http/test/RefsUnreadableInMemoryRepository.java
  2. 196
      org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsReftableBatchRefUpdate.java
  3. 231
      org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsReftableDatabase.java
  4. 330
      org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/ReftableBatchRefUpdate.java
  5. 295
      org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/ReftableDatabase.java

41
org.eclipse.jgit.http.test/src/org/eclipse/jgit/http/test/RefsUnreadableInMemoryRepository.java
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@ -43,10 +43,14 @@
package org.eclipse.jgit.http.test; package org.eclipse.jgit.http.test;
import java.io.IOException; import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.eclipse.jgit.internal.storage.dfs.DfsRepositoryDescription; import org.eclipse.jgit.internal.storage.dfs.DfsRepositoryDescription;
import org.eclipse.jgit.internal.storage.dfs.InMemoryRepository; import org.eclipse.jgit.internal.storage.dfs.InMemoryRepository;
import org.eclipse.jgit.internal.storage.reftable.Reftable; import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.RefDatabase; import org.eclipse.jgit.lib.RefDatabase;
/** /**
@ -82,12 +86,43 @@ class RefsUnreadableInMemoryRepository extends InMemoryRepository {
} }
private class RefsUnreadableRefDatabase extends MemRefDatabase { private class RefsUnreadableRefDatabase extends MemRefDatabase {
/** {@inheritDoc} */
@Override
public Ref exactRef(String name) throws IOException {
if (failing) {
throw new IOException("disk failed, no refs found");
}
return super.exactRef(name);
}
/** {@inheritDoc} */
@Override
public Map<String, Ref> getRefs(String prefix) throws IOException {
if (failing) {
throw new IOException("disk failed, no refs found");
}
return super.getRefs(prefix);
}
/** {@inheritDoc} */
@Override
public List<Ref> getRefsByPrefix(String prefix) throws IOException {
if (failing) {
throw new IOException("disk failed, no refs found");
}
return super.getRefsByPrefix(prefix);
}
/** {@inheritDoc} */
@Override @Override
protected Reftable reader() throws IOException { public Set<Ref> getTipsWithSha1(ObjectId id) throws IOException {
if (failing) { if (failing) {
throw new IOException("disk failed, no refs found"); throw new IOException("disk failed, no refs found");
} }
return super.reader(); return super.getTipsWithSha1(id);
} }
} }
} }

196
org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsReftableBatchRefUpdate.java
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@ -0,0 +1,196 @@
/*
* Copyright (C) 2019, 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.internal.storage.dfs;
import org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource;
import org.eclipse.jgit.internal.storage.io.BlockSource;
import org.eclipse.jgit.internal.storage.pack.PackExt;
import org.eclipse.jgit.internal.storage.reftable.ReftableBatchRefUpdate;
import org.eclipse.jgit.internal.storage.reftable.ReftableCompactor;
import org.eclipse.jgit.internal.storage.reftable.ReftableConfig;
import org.eclipse.jgit.internal.storage.reftable.ReftableReader;
import org.eclipse.jgit.internal.storage.reftable.ReftableWriter;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.transport.ReceiveCommand;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import static org.eclipse.jgit.internal.storage.pack.PackExt.REFTABLE;
/**
* {@link org.eclipse.jgit.lib.BatchRefUpdate} for
* {@link org.eclipse.jgit.internal.storage.dfs.DfsReftableDatabase}.
*/
public class DfsReftableBatchRefUpdate extends ReftableBatchRefUpdate {
private static final int AVG_BYTES = 36;
private final DfsReftableDatabase refdb;
private final DfsObjDatabase odb;
/**
* Initialize batch update.
*
* @param refdb
* database the update will modify.
* @param odb
* object database to store the reftable.
*/
protected DfsReftableBatchRefUpdate(DfsReftableDatabase refdb,
DfsObjDatabase odb) {
super(refdb, refdb.reftableDatabase, refdb.getLock(), refdb.getRepository());
this.refdb = refdb;
this.odb = odb;
}
@Override
protected void applyUpdates(List<Ref> newRefs, List<ReceiveCommand> pending)
throws IOException {
Set<DfsPackDescription> prune = Collections.emptySet();
DfsPackDescription pack = odb.newPack(PackSource.INSERT);
try (DfsOutputStream out = odb.writeFile(pack, REFTABLE)) {
ReftableConfig cfg = DfsPackCompactor
.configureReftable(refdb.getReftableConfig(), out);
ReftableWriter.Stats stats;
if (refdb.compactDuringCommit()
&& newRefs.size() * AVG_BYTES <= cfg.getRefBlockSize()
&& canCompactTopOfStack(cfg)) {
ByteArrayOutputStream tmp = new ByteArrayOutputStream();
ReftableWriter rw = new ReftableWriter(cfg, tmp);
write(rw, newRefs, pending);
rw.finish();
stats = compactTopOfStack(out, cfg, tmp.toByteArray());
prune = toPruneTopOfStack();
} else {
ReftableWriter rw = new ReftableWriter(cfg, out);
write(rw, newRefs, pending);
rw.finish();
stats = rw.getStats();
}
pack.addFileExt(REFTABLE);
pack.setReftableStats(stats);
}
odb.commitPack(Collections.singleton(pack), prune);
odb.addReftable(pack, prune);
refdb.clearCache();
}
private boolean canCompactTopOfStack(ReftableConfig cfg)
throws IOException {
refdb.getLock().lock();
try {
DfsReftableStack stack = refdb.stack();
List<ReftableReader> readers = stack.readers();
if (readers.isEmpty()) {
return false;
}
int lastIdx = readers.size() - 1;
DfsReftable last = stack.files().get(lastIdx);
DfsPackDescription desc = last.getPackDescription();
if (desc.getPackSource() != PackSource.INSERT
|| !packOnlyContainsReftable(desc)) {
return false;
}
ReftableReader table = readers.get(lastIdx);
int bs = cfg.getRefBlockSize();
return table.size() <= 3 * bs;
} finally {
refdb.getLock().unlock();
}
}
private ReftableWriter.Stats compactTopOfStack(OutputStream out,
ReftableConfig cfg, byte[] newTable) throws IOException {
refdb.getLock().lock();
try {
List<ReftableReader> stack = refdb.stack().readers();
ReftableReader last = stack.get(stack.size() - 1);
List<ReftableReader> tables = new ArrayList<>(2);
tables.add(last);
tables.add(new ReftableReader(BlockSource.from(newTable)));
ReftableCompactor compactor = new ReftableCompactor(out);
compactor.setConfig(cfg);
compactor.setIncludeDeletes(true);
compactor.addAll(tables);
compactor.compact();
return compactor.getStats();
} finally {
refdb.getLock().unlock();
}
}
private Set<DfsPackDescription> toPruneTopOfStack() throws IOException {
refdb.getLock().lock();
try {
List<DfsReftable> stack = refdb.stack().files();
DfsReftable last = stack.get(stack.size() - 1);
return Collections.singleton(last.getPackDescription());
} finally {
refdb.getLock().unlock();
}
}
private boolean packOnlyContainsReftable(DfsPackDescription desc) {
for (PackExt ext : PackExt.values()) {
if (ext != REFTABLE && desc.hasFileExt(ext)) {
return false;
}
}
return true;
}
}

231
org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsReftableDatabase.java
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@ -45,19 +45,17 @@ package org.eclipse.jgit.internal.storage.dfs;
import java.io.IOException; import java.io.IOException;
import java.util.Arrays; import java.util.Arrays;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet; import java.util.HashSet;
import java.util.List; import java.util.List;
import java.util.Map; import java.util.Map;
import java.util.Set; import java.util.Set;
import java.util.TreeSet;
import java.util.concurrent.locks.ReentrantLock; import java.util.concurrent.locks.ReentrantLock;
import org.eclipse.jgit.annotations.Nullable; import org.eclipse.jgit.annotations.Nullable;
import org.eclipse.jgit.internal.storage.reftable.MergedReftable; import org.eclipse.jgit.internal.storage.reftable.MergedReftable;
import org.eclipse.jgit.internal.storage.reftable.RefCursor;
import org.eclipse.jgit.internal.storage.reftable.Reftable;
import org.eclipse.jgit.internal.storage.reftable.ReftableConfig; import org.eclipse.jgit.internal.storage.reftable.ReftableConfig;
import org.eclipse.jgit.internal.storage.reftable.ReftableDatabase;
import org.eclipse.jgit.lib.BatchRefUpdate; import org.eclipse.jgit.lib.BatchRefUpdate;
import org.eclipse.jgit.lib.NullProgressMonitor; import org.eclipse.jgit.lib.NullProgressMonitor;
import org.eclipse.jgit.lib.ObjectId; import org.eclipse.jgit.lib.ObjectId;
@ -81,13 +79,10 @@ import org.eclipse.jgit.util.RefMap;
* and one will fail. * and one will fail.
*/ */
public class DfsReftableDatabase extends DfsRefDatabase { public class DfsReftableDatabase extends DfsRefDatabase {
private final ReentrantLock lock = new ReentrantLock(true); final ReftableDatabase reftableDatabase;
private DfsReader ctx; private DfsReader ctx;
private DfsReftableStack stack;
private DfsReftableStack tableStack;
private MergedReftable mergedTables;
/** /**
* Initialize the reference database for a repository. * Initialize the reference database for a repository.
@ -97,6 +92,18 @@ public class DfsReftableDatabase extends DfsRefDatabase {
*/ */
protected DfsReftableDatabase(DfsRepository repo) { protected DfsReftableDatabase(DfsRepository repo) {
super(repo); super(repo);
reftableDatabase = new ReftableDatabase() {
@Override
public MergedReftable openMergedReftable() throws IOException {
DfsReftableDatabase.this.getLock().lock();
try {
return new MergedReftable(stack().readers());
} finally {
DfsReftableDatabase.this.getLock().unlock();
}
}
};
stack = null;
} }
/** {@inheritDoc} */ /** {@inheritDoc} */
@ -115,7 +122,7 @@ public class DfsReftableDatabase extends DfsRefDatabase {
@Override @Override
public BatchRefUpdate newBatchUpdate() { public BatchRefUpdate newBatchUpdate() {
DfsObjDatabase odb = getRepository().getObjectDatabase(); DfsObjDatabase odb = getRepository().getObjectDatabase();
return new ReftableBatchRefUpdate(this, odb); return new DfsReftableBatchRefUpdate(this, odb);
} }
/** /**
@ -133,7 +140,7 @@ public class DfsReftableDatabase extends DfsRefDatabase {
* @return the lock protecting this instance's state. * @return the lock protecting this instance's state.
*/ */
protected ReentrantLock getLock() { protected ReentrantLock getLock() {
return lock; return reftableDatabase.getLock();
} }
/** /**
@ -147,134 +154,55 @@ public class DfsReftableDatabase extends DfsRefDatabase {
return true; return true;
} }
/**
* Obtain a handle to the merged reader.
*
* @return (possibly cached) handle to the merged reader.
* @throws java.io.IOException
* if tables cannot be opened.
*/
protected Reftable reader() throws IOException {
lock.lock();
try {
if (mergedTables == null) {
mergedTables = new MergedReftable(stack().readers());
}
return mergedTables;
} finally {
lock.unlock();
}
}
/** /**
* Obtain a handle to the stack of reftables. * Obtain a handle to the stack of reftables. Must hold lock.
* *
* @return (possibly cached) handle to the stack. * @return (possibly cached) handle to the stack.
* @throws java.io.IOException * @throws java.io.IOException
* if tables cannot be opened. * if tables cannot be opened.
*/ */
protected DfsReftableStack stack() throws IOException { protected DfsReftableStack stack() throws IOException {
lock.lock(); assert getLock().isLocked();
try { DfsObjDatabase odb = getRepository().getObjectDatabase();
if (tableStack == null) {
DfsObjDatabase odb = getRepository().getObjectDatabase(); if (ctx == null) {
if (ctx == null) { ctx = odb.newReader();
ctx = odb.newReader();
}
tableStack = DfsReftableStack.open(ctx,
Arrays.asList(odb.getReftables()));
}
return tableStack;
} finally {
lock.unlock();
} }
if (stack == null) {
stack = DfsReftableStack.open(ctx, Arrays.asList(odb.getReftables()));
}
return stack;
} }
/** {@inheritDoc} */
@Override @Override
public boolean isNameConflicting(String refName) throws IOException { public boolean isNameConflicting(String refName) throws IOException {
lock.lock(); return reftableDatabase.isNameConflicting(refName, new TreeSet<>(), new HashSet<>());
try {
Reftable table = reader();
// Cannot be nested within an existing reference.
int lastSlash = refName.lastIndexOf('/');
while (0 < lastSlash) {
if (table.hasRef(refName.substring(0, lastSlash))) {
return true;
}
lastSlash = refName.lastIndexOf('/', lastSlash - 1);
}
// Cannot be the container of an existing reference.
return table.hasRefsWithPrefix(refName + '/');
} finally {
lock.unlock();
}
} }
/** {@inheritDoc} */ /** {@inheritDoc} */
@Override @Override
public Ref exactRef(String name) throws IOException { public Ref exactRef(String name) throws IOException {
lock.lock(); return reftableDatabase.exactRef(name);
try {
Reftable table = reader();
Ref ref = table.exactRef(name);
if (ref != null && ref.isSymbolic()) {
return table.resolve(ref);
}
return ref;
} finally {
lock.unlock();
}
} }
/** {@inheritDoc} */ /** {@inheritDoc} */
@Override @Override
public Map<String, Ref> getRefs(String prefix) throws IOException { public Map<String, Ref> getRefs(String prefix) throws IOException {
RefList.Builder<Ref> all = new RefList.Builder<>(); List<Ref> refs = reftableDatabase.getRefsByPrefix(prefix);
lock.lock(); RefList.Builder<Ref> builder = new RefList.Builder<>(refs.size());
try { for (Ref r : refs) {
Reftable table = reader(); builder.add(r);
try (RefCursor rc = ALL.equals(prefix) ? table.allRefs()
: (prefix.endsWith("/") ? table.seekRefsWithPrefix(prefix) //$NON-NLS-1$
: table.seekRef(prefix))) {
while (rc.next()) {
Ref ref = table.resolve(rc.getRef());
if (ref != null && ref.getObjectId() != null) {
all.add(ref);
}
}
}
} finally {
lock.unlock();
} }
return new RefMap(prefix, builder.toRefList(), RefList.emptyList(),
RefList<Ref> none = RefList.emptyList(); RefList.emptyList());
return new RefMap(prefix, all.toRefList(), none, none);
} }
/** {@inheritDoc} */ /** {@inheritDoc} */
@Override @Override
public List<Ref> getRefsByPrefix(String prefix) throws IOException { public List<Ref> getRefsByPrefix(String prefix) throws IOException {
List<Ref> all = new ArrayList<>();
lock.lock();
try {
Reftable table = reader();
try (RefCursor rc = ALL.equals(prefix) ? table.allRefs()
: table.seekRefsWithPrefix(prefix)) {
while (rc.next()) {
Ref ref = table.resolve(rc.getRef());
if (ref != null && ref.getObjectId() != null) {
all.add(ref);
}
}
}
} finally {
lock.unlock();
}
return Collections.unmodifiableList(all); return reftableDatabase.getRefsByPrefix(prefix);
} }
/** {@inheritDoc} */ /** {@inheritDoc} */
@ -283,17 +211,7 @@ public class DfsReftableDatabase extends DfsRefDatabase {
if (!getReftableConfig().isIndexObjects()) { if (!getReftableConfig().isIndexObjects()) {
return super.getTipsWithSha1(id); return super.getTipsWithSha1(id);
} }
lock.lock(); return reftableDatabase.getTipsWithSha1(id);
try {
RefCursor cursor = reader().byObjectId(id);
Set<Ref> refs = new HashSet<>();
while (cursor.next()) {
refs.add(cursor.getRef());
}
return refs;
} finally {
lock.unlock();
}
} }
/** {@inheritDoc} */ /** {@inheritDoc} */
@ -314,19 +232,19 @@ public class DfsReftableDatabase extends DfsRefDatabase {
@Override @Override
void clearCache() { void clearCache() {
lock.lock(); getLock().lock();
try { try {
if (tableStack != null) {
tableStack.close();
tableStack = null;
}
if (ctx != null) { if (ctx != null) {
ctx.close(); ctx.close();
ctx = null; ctx = null;
} }
mergedTables = null; reftableDatabase.clearCache();
if (stack != null) {
stack.close();
stack = null;
}
} finally { } finally {
lock.unlock(); getLock().unlock();
} }
} }
@ -334,7 +252,7 @@ public class DfsReftableDatabase extends DfsRefDatabase {
@Override @Override
protected boolean compareAndPut(Ref oldRef, @Nullable Ref newRef) protected boolean compareAndPut(Ref oldRef, @Nullable Ref newRef)
throws IOException { throws IOException {
ReceiveCommand cmd = toCommand(oldRef, newRef); ReceiveCommand cmd = ReftableDatabase.toCommand(oldRef, newRef);
try (RevWalk rw = new RevWalk(getRepository())) { try (RevWalk rw = new RevWalk(getRepository())) {
rw.setRetainBody(false); rw.setRetainBody(false);
newBatchUpdate().setAllowNonFastForwards(true).addCommand(cmd) newBatchUpdate().setAllowNonFastForwards(true).addCommand(cmd)
@ -351,58 +269,6 @@ public class DfsReftableDatabase extends DfsRefDatabase {
} }
} }
private static ReceiveCommand toCommand(Ref oldRef, Ref newRef) {
ObjectId oldId = toId(oldRef);
ObjectId newId = toId(newRef);
String name = toName(oldRef, newRef);
if (oldRef != null && oldRef.isSymbolic()) {
if (newRef != null) {
if (newRef.isSymbolic()) {
return ReceiveCommand.link(oldRef.getTarget().getName(),
newRef.getTarget().getName(), name);
} else {
return ReceiveCommand.unlink(oldRef.getTarget().getName(),
newId, name);
}
} else {
return ReceiveCommand.unlink(oldRef.getTarget().getName(),
ObjectId.zeroId(), name);
}
}
if (newRef != null && newRef.isSymbolic()) {
if (oldRef != null) {
if (oldRef.isSymbolic()) {
return ReceiveCommand.link(oldRef.getTarget().getName(),
newRef.getTarget().getName(), name);
} else {
return ReceiveCommand.link(oldId,
newRef.getTarget().getName(), name);
}
} else {
return ReceiveCommand.link(ObjectId.zeroId(),
newRef.getTarget().getName(), name);
}
}
return new ReceiveCommand(oldId, newId, name);
}
private static ObjectId toId(Ref ref) {
if (ref != null) {
ObjectId id = ref.getObjectId();
if (id != null) {
return id;
}
}
return ObjectId.zeroId();
}
private static String toName(Ref oldRef, Ref newRef) {
return oldRef != null ? oldRef.getName() : newRef.getName();
}
/** {@inheritDoc} */ /** {@inheritDoc} */
@Override @Override
protected boolean compareAndRemove(Ref oldRef) throws IOException { protected boolean compareAndRemove(Ref oldRef) throws IOException {
@ -417,12 +283,12 @@ public class DfsReftableDatabase extends DfsRefDatabase {
@Override @Override
void stored(Ref ref) { void stored(Ref ref) {
// Unnecessary; ReftableBatchRefUpdate calls clearCache(). // Unnecessary; DfsReftableBatchRefUpdate calls clearCache().
} }
@Override @Override
void removed(String refName) { void removed(String refName) {
// Unnecessary; ReftableBatchRefUpdate calls clearCache(). // Unnecessary; DfsReftableBatchRefUpdate calls clearCache().
} }
/** {@inheritDoc} */ /** {@inheritDoc} */
@ -430,4 +296,5 @@ public class DfsReftableDatabase extends DfsRefDatabase {
protected void cachePeeledState(Ref oldLeaf, Ref newLeaf) { protected void cachePeeledState(Ref oldLeaf, Ref newLeaf) {
// Do not cache peeled state in reftable. // Do not cache peeled state in reftable.
} }
} }

330
org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/ReftableBatchRefUpdate.java → org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/ReftableBatchRefUpdate.java
Unescape View File

@ -1,5 +1,5 @@
/* /*
* Copyright (C) 2017, Google Inc. * Copyright (C) 2019, Google Inc.
* and other copyright owners as documented in the project's IP log. * and other copyright owners as documented in the project's IP log.
* *
* This program and the accompanying materials are made available * This program and the accompanying materials are made available
@ -41,40 +41,11 @@
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/ */
package org.eclipse.jgit.internal.storage.dfs; package org.eclipse.jgit.internal.storage.reftable;
import static org.eclipse.jgit.internal.storage.pack.PackExt.REFTABLE;
import static org.eclipse.jgit.lib.Ref.Storage.NEW;
import static org.eclipse.jgit.lib.Ref.Storage.PACKED;
import static org.eclipse.jgit.transport.ReceiveCommand.Result.LOCK_FAILURE;
import static org.eclipse.jgit.transport.ReceiveCommand.Result.NOT_ATTEMPTED;
import static org.eclipse.jgit.transport.ReceiveCommand.Result.OK;
import static org.eclipse.jgit.transport.ReceiveCommand.Result.REJECTED_MISSING_OBJECT;
import static org.eclipse.jgit.transport.ReceiveCommand.Result.REJECTED_NONFASTFORWARD;
import static org.eclipse.jgit.transport.ReceiveCommand.Type.UPDATE_NONFASTFORWARD;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.locks.ReentrantLock;
import org.eclipse.jgit.annotations.Nullable; import org.eclipse.jgit.annotations.Nullable;
import org.eclipse.jgit.errors.MissingObjectException; import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource; import org.eclipse.jgit.internal.JGitText;
import org.eclipse.jgit.internal.storage.io.BlockSource;
import org.eclipse.jgit.internal.storage.pack.PackExt;
import org.eclipse.jgit.internal.storage.reftable.Reftable;
import org.eclipse.jgit.internal.storage.reftable.ReftableCompactor;
import org.eclipse.jgit.internal.storage.reftable.ReftableConfig;
import org.eclipse.jgit.internal.storage.reftable.ReftableReader;
import org.eclipse.jgit.internal.storage.reftable.ReftableWriter;
import org.eclipse.jgit.lib.AnyObjectId; import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.BatchRefUpdate; import org.eclipse.jgit.lib.BatchRefUpdate;
import org.eclipse.jgit.lib.ObjectId; import org.eclipse.jgit.lib.ObjectId;
@ -82,43 +53,65 @@ import org.eclipse.jgit.lib.ObjectIdRef;
import org.eclipse.jgit.lib.PersonIdent; import org.eclipse.jgit.lib.PersonIdent;
import org.eclipse.jgit.lib.ProgressMonitor; import org.eclipse.jgit.lib.ProgressMonitor;
import org.eclipse.jgit.lib.Ref; import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.RefDatabase;
import org.eclipse.jgit.lib.ReflogEntry; import org.eclipse.jgit.lib.ReflogEntry;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.lib.SymbolicRef; import org.eclipse.jgit.lib.SymbolicRef;
import org.eclipse.jgit.revwalk.RevObject; import org.eclipse.jgit.revwalk.RevObject;
import org.eclipse.jgit.revwalk.RevTag; import org.eclipse.jgit.revwalk.RevTag;
import org.eclipse.jgit.revwalk.RevWalk; import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.transport.ReceiveCommand; import org.eclipse.jgit.transport.ReceiveCommand;
/** import java.io.IOException;
* {@link org.eclipse.jgit.lib.BatchRefUpdate} for import java.util.ArrayList;
* {@link org.eclipse.jgit.internal.storage.dfs.DfsReftableDatabase}. import java.util.Collections;
*/ import java.util.HashMap;
public class ReftableBatchRefUpdate extends BatchRefUpdate { import java.util.List;
private static final int AVG_BYTES = 36; import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import java.util.concurrent.locks.Lock;
import java.util.stream.Collectors;
import static org.eclipse.jgit.lib.Ref.Storage.NEW;
import static org.eclipse.jgit.lib.Ref.Storage.PACKED;
private final DfsReftableDatabase refdb; import static org.eclipse.jgit.transport.ReceiveCommand.Result.LOCK_FAILURE;
import static org.eclipse.jgit.transport.ReceiveCommand.Result.NOT_ATTEMPTED;
import static org.eclipse.jgit.transport.ReceiveCommand.Result.OK;
import static org.eclipse.jgit.transport.ReceiveCommand.Result.REJECTED_MISSING_OBJECT;
import static org.eclipse.jgit.transport.ReceiveCommand.Result.REJECTED_NONFASTFORWARD;
import static org.eclipse.jgit.transport.ReceiveCommand.Type.DELETE;
import static org.eclipse.jgit.transport.ReceiveCommand.Type.UPDATE_NONFASTFORWARD;
private final DfsObjDatabase odb; /**
* {@link org.eclipse.jgit.lib.BatchRefUpdate} for Reftable based RefDatabase.
*/
public abstract class ReftableBatchRefUpdate extends BatchRefUpdate {
private final Lock lock;
private final ReentrantLock lock; private final ReftableDatabase refDb;
private final ReftableConfig reftableConfig; private final Repository repository;
/** /**
* Initialize batch update. * Initialize.
* *
* @param refdb * @param refdb
* database the update will modify. * The RefDatabase
* @param odb * @param reftableDb
* object database to store the reftable. * The ReftableDatabase
* @param lock
* A lock protecting the refdatabase's state
* @param repository
* The repository on which this update will run
*/ */
protected ReftableBatchRefUpdate(DfsReftableDatabase refdb, protected ReftableBatchRefUpdate(RefDatabase refdb, ReftableDatabase reftableDb, Lock lock,
DfsObjDatabase odb) { Repository repository) {
super(refdb); super(refdb);
this.refdb = refdb; this.refDb = reftableDb;
this.odb = odb; this.lock = lock;
lock = refdb.getLock(); this.repository = repository;
reftableConfig = refdb.getReftableConfig();
} }
/** {@inheritDoc} */ /** {@inheritDoc} */
@ -135,24 +128,36 @@ public class ReftableBatchRefUpdate extends BatchRefUpdate {
if (!checkObjectExistence(rw, pending)) { if (!checkObjectExistence(rw, pending)) {
return; return;
} }
// if we are here, checkObjectExistence might have flagged some problems
// but the transaction is not atomic, so we should proceed with the other
// pending commands.
pending = getPending();
if (!checkNonFastForwards(rw, pending)) { if (!checkNonFastForwards(rw, pending)) {
return; return;
} }
pending = getPending();
lock.lock(); lock.lock();
try { try {
if (!checkExpected(pending)) { if (!checkExpected(pending)) {
return; return;
} }
pending = getPending();
if (!checkConflicting(pending)) { if (!checkConflicting(pending)) {
return; return;
} }
pending = getPending();
if (!blockUntilTimestamps(MAX_WAIT)) { if (!blockUntilTimestamps(MAX_WAIT)) {
return; return;
} }
applyUpdates(rw, pending);
List<Ref> newRefs = toNewRefs(rw, pending);
applyUpdates(newRefs, pending);
for (ReceiveCommand cmd : pending) { for (ReceiveCommand cmd : pending) {
cmd.setResult(OK); if (cmd.getResult() == NOT_ATTEMPTED) {
// XXX this is a bug in DFS ?
cmd.setResult(OK);
}
} }
} finally { } finally {
lock.unlock(); lock.unlock();
@ -163,6 +168,19 @@ public class ReftableBatchRefUpdate extends BatchRefUpdate {
} }
} }
/**
* Implements the storage-specific part of the update.
*
* @param newRefs
* the new refs to create
* @param pending
* the pending receive commands to be executed
* @throws IOException
* if any of the writes fail.
*/
protected abstract void applyUpdates(List<Ref> newRefs,
List<ReceiveCommand> pending) throws IOException;
private List<ReceiveCommand> getPending() { private List<ReceiveCommand> getPending() {
return ReceiveCommand.filter(getCommands(), NOT_ATTEMPTED); return ReceiveCommand.filter(getCommands(), NOT_ATTEMPTED);
} }
@ -180,8 +198,10 @@ public class ReftableBatchRefUpdate extends BatchRefUpdate {
// used for a missing object. Eagerly handle this case so we // used for a missing object. Eagerly handle this case so we
// can set the right result. // can set the right result.
cmd.setResult(REJECTED_MISSING_OBJECT); cmd.setResult(REJECTED_MISSING_OBJECT);
ReceiveCommand.abort(pending); if (isAtomic()) {
return false; ReceiveCommand.abort(pending);
return false;
}
} }
} }
return true; return true;
@ -196,8 +216,10 @@ public class ReftableBatchRefUpdate extends BatchRefUpdate {
cmd.updateType(rw); cmd.updateType(rw);
if (cmd.getType() == UPDATE_NONFASTFORWARD) { if (cmd.getType() == UPDATE_NONFASTFORWARD) {
cmd.setResult(REJECTED_NONFASTFORWARD); cmd.setResult(REJECTED_NONFASTFORWARD);
ReceiveCommand.abort(pending); if (isAtomic()) {
return false; ReceiveCommand.abort(pending);
return false;
}
} }
} }
return true; return true;
@ -205,40 +227,55 @@ public class ReftableBatchRefUpdate extends BatchRefUpdate {
private boolean checkConflicting(List<ReceiveCommand> pending) private boolean checkConflicting(List<ReceiveCommand> pending)
throws IOException { throws IOException {
Set<String> names = new HashSet<>(); TreeSet<String> added = new TreeSet<>();
for (ReceiveCommand cmd : pending) { Set<String> deleted =
names.add(cmd.getRefName()); pending.stream()
} .filter(cmd -> cmd.getType() == DELETE)
.map(c -> c.getRefName())
.collect(Collectors.toSet());
boolean ok = true; boolean ok = true;
for (ReceiveCommand cmd : pending) { for (ReceiveCommand cmd : pending) {
if (cmd.getType() == DELETE) {
continue;
}
String name = cmd.getRefName(); String name = cmd.getRefName();
if (refdb.isNameConflicting(name)) { if (refDb.isNameConflicting(name, added, deleted)) {
cmd.setResult(LOCK_FAILURE); if (isAtomic()) {
ok = false; cmd.setResult(
} else { ReceiveCommand.Result.REJECTED_OTHER_REASON, JGitText.get().transactionAborted);
int s = name.lastIndexOf('/'); } else {
while (0 < s) { cmd.setResult(LOCK_FAILURE);
if (names.contains(name.substring(0, s))) {
cmd.setResult(LOCK_FAILURE);
ok = false;
break;
}
s = name.lastIndexOf('/', s - 1);
} }
ok = false;
} }
added.add(name);
} }
if (!ok && isAtomic()) {
ReceiveCommand.abort(pending); if (isAtomic()) {
return false; if (!ok) {
pending.stream()
.filter(cmd -> cmd.getResult() == NOT_ATTEMPTED)
.forEach(cmd -> cmd.setResult(LOCK_FAILURE));
}
return ok;
} }
return ok;
for (ReceiveCommand cmd : pending) {
if (cmd.getResult() == NOT_ATTEMPTED) {
return true;
}
}
return false;
} }
private boolean checkExpected(List<ReceiveCommand> pending) private boolean checkExpected(List<ReceiveCommand> pending)
throws IOException { throws IOException {
for (ReceiveCommand cmd : pending) { for (ReceiveCommand cmd : pending) {
if (!matchOld(cmd, refdb.exactRef(cmd.getRefName()))) { if (!matchOld(cmd, refDb.exactRef(cmd.getRefName()))) {
cmd.setResult(LOCK_FAILURE); cmd.setResult(LOCK_FAILURE);
if (isAtomic()) { if (isAtomic()) {
ReceiveCommand.abort(pending); ReceiveCommand.abort(pending);
@ -252,7 +289,7 @@ public class ReftableBatchRefUpdate extends BatchRefUpdate {
private static boolean matchOld(ReceiveCommand cmd, @Nullable Ref ref) { private static boolean matchOld(ReceiveCommand cmd, @Nullable Ref ref) {
if (ref == null) { if (ref == null) {
return AnyObjectId.isEqual(ObjectId.zeroId(), cmd.getOldId()) return AnyObjectId.isEqual(ObjectId.zeroId(), cmd.getOldId())
&& cmd.getOldSymref() == null; && cmd.getOldSymref() == null;
} else if (ref.isSymbolic()) { } else if (ref.isSymbolic()) {
return ref.getTarget().getName().equals(cmd.getOldSymref()); return ref.getTarget().getName().equals(cmd.getOldSymref());
} }
@ -263,47 +300,26 @@ public class ReftableBatchRefUpdate extends BatchRefUpdate {
return cmd.getOldId().equals(id); return cmd.getOldId().equals(id);
} }
private void applyUpdates(RevWalk rw, List<ReceiveCommand> pending) /**
throws IOException { * Writes the refs to the writer, and calls finish.
List<Ref> newRefs = toNewRefs(rw, pending); *
long updateIndex = nextUpdateIndex(); * @param writer
Set<DfsPackDescription> prune = Collections.emptySet(); * the writer on which we should write.
DfsPackDescription pack = odb.newPack(PackSource.INSERT); * @param newRefs
try (DfsOutputStream out = odb.writeFile(pack, REFTABLE)) { * the ref data to write..
ReftableConfig cfg = DfsPackCompactor * @param pending
.configureReftable(reftableConfig, out); * the log data to write.
* @throws IOException
ReftableWriter.Stats stats; * in case of problems.
if (refdb.compactDuringCommit() */
&& newRefs.size() * AVG_BYTES <= cfg.getRefBlockSize() protected void write(ReftableWriter writer, List<Ref> newRefs,
&& canCompactTopOfStack(cfg)) { List<ReceiveCommand> pending) throws IOException {
ByteArrayOutputStream tmp = new ByteArrayOutputStream(); long updateIndex = refDb.nextUpdateIndex();
write(tmp, cfg, updateIndex, newRefs, pending); writer.setMinUpdateIndex(updateIndex).setMaxUpdateIndex(updateIndex)
stats = compactTopOfStack(out, cfg, tmp.toByteArray());
prune = toPruneTopOfStack();
} else {
stats = write(out, cfg, updateIndex, newRefs, pending);
}
pack.addFileExt(REFTABLE);
pack.setReftableStats(stats);
}
odb.commitPack(Collections.singleton(pack), prune);
odb.addReftable(pack, prune);
refdb.clearCache();
}
private ReftableWriter.Stats write(OutputStream os, ReftableConfig cfg,
long updateIndex, List<Ref> newRefs, List<ReceiveCommand> pending)
throws IOException {
ReftableWriter writer = new ReftableWriter(cfg, os)
.setMinUpdateIndex(updateIndex).setMaxUpdateIndex(updateIndex)
.begin().sortAndWriteRefs(newRefs); .begin().sortAndWriteRefs(newRefs);
if (!isRefLogDisabled()) { if (!isRefLogDisabled()) {
writeLog(writer, updateIndex, pending); writeLog(writer, updateIndex, pending);
} }
writer.finish();
return writer.getStats();
} }
private void writeLog(ReftableWriter writer, long updateIndex, private void writeLog(ReftableWriter writer, long updateIndex,
@ -318,7 +334,7 @@ public class ReftableBatchRefUpdate extends BatchRefUpdate {
PersonIdent ident = getRefLogIdent(); PersonIdent ident = getRefLogIdent();
if (ident == null) { if (ident == null) {
ident = new PersonIdent(refdb.getRepository()); ident = new PersonIdent(repository);
} }
for (String name : byName) { for (String name : byName) {
ReceiveCommand cmd = cmds.get(name); ReceiveCommand cmd = cmds.get(name);
@ -360,20 +376,25 @@ public class ReftableBatchRefUpdate extends BatchRefUpdate {
} }
} }
// Extracts and peels the refs out of the ReceiveCommands
private static List<Ref> toNewRefs(RevWalk rw, List<ReceiveCommand> pending) private static List<Ref> toNewRefs(RevWalk rw, List<ReceiveCommand> pending)
throws IOException { throws IOException {
List<Ref> refs = new ArrayList<>(pending.size()); List<Ref> refs = new ArrayList<>(pending.size());
for (ReceiveCommand cmd : pending) { for (ReceiveCommand cmd : pending) {
if (cmd.getResult() != NOT_ATTEMPTED) {
continue;
}
String name = cmd.getRefName(); String name = cmd.getRefName();
ObjectId newId = cmd.getNewId(); ObjectId newId = cmd.getNewId();
String newSymref = cmd.getNewSymref(); String newSymref = cmd.getNewSymref();
if (AnyObjectId.isEqual(ObjectId.zeroId(), newId) if (AnyObjectId.isEqual(ObjectId.zeroId(), newId)
&& newSymref == null) { && newSymref == null) {
refs.add(new ObjectIdRef.Unpeeled(NEW, name, null)); refs.add(new ObjectIdRef.Unpeeled(NEW, name, null));
continue; continue;
} else if (newSymref != null) { } else if (newSymref != null) {
refs.add(new SymbolicRef(name, refs.add(new SymbolicRef(name,
new ObjectIdRef.Unpeeled(NEW, newSymref, null))); new ObjectIdRef.Unpeeled(NEW, newSymref, null)));
continue; continue;
} }
@ -384,76 +405,11 @@ public class ReftableBatchRefUpdate extends BatchRefUpdate {
} }
if (peel != null) { if (peel != null) {
refs.add(new ObjectIdRef.PeeledTag(PACKED, name, newId, refs.add(new ObjectIdRef.PeeledTag(PACKED, name, newId,
peel.copy())); peel.copy()));
} else { } else {
refs.add(new ObjectIdRef.PeeledNonTag(PACKED, name, newId)); refs.add(new ObjectIdRef.PeeledNonTag(PACKED, name, newId));
} }
} }
return refs; return refs;
} }
private long nextUpdateIndex() throws IOException {
long updateIndex = 0;
for (Reftable r : refdb.stack().readers()) {
if (r instanceof ReftableReader) {
updateIndex = Math.max(updateIndex,
((ReftableReader) r).maxUpdateIndex());
}
}
return updateIndex + 1;
}
private boolean canCompactTopOfStack(ReftableConfig cfg)
throws IOException {
DfsReftableStack stack = refdb.stack();
List<ReftableReader> readers = stack.readers();
if (readers.isEmpty()) {
return false;
}
int lastIdx = readers.size() - 1;
DfsReftable last = stack.files().get(lastIdx);
DfsPackDescription desc = last.getPackDescription();
if (desc.getPackSource() != PackSource.INSERT
|| !packOnlyContainsReftable(desc)) {
return false;
}
Reftable table = readers.get(lastIdx);
int bs = cfg.getRefBlockSize();
return table instanceof ReftableReader
&& ((ReftableReader) table).size() <= 3 * bs;
}
private ReftableWriter.Stats compactTopOfStack(OutputStream out,
ReftableConfig cfg, byte[] newTable) throws IOException {
List<ReftableReader> stack = refdb.stack().readers();
ReftableReader last = stack.get(stack.size() - 1);
List<ReftableReader> tables = new ArrayList<>(2);
tables.add(last);
tables.add(new ReftableReader(BlockSource.from(newTable)));
ReftableCompactor compactor = new ReftableCompactor(out);
compactor.setConfig(cfg);
compactor.setIncludeDeletes(true);
compactor.addAll(tables);
compactor.compact();
return compactor.getStats();
}
private Set<DfsPackDescription> toPruneTopOfStack() throws IOException {
List<DfsReftable> stack = refdb.stack().files();
DfsReftable last = stack.get(stack.size() - 1);
return Collections.singleton(last.getPackDescription());
}
private boolean packOnlyContainsReftable(DfsPackDescription desc) {
for (PackExt ext : PackExt.values()) {
if (ext != REFTABLE && desc.hasFileExt(ext)) {
return false;
}
}
return true;
}
} }

295
org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/ReftableDatabase.java
Unescape View File

@ -0,0 +1,295 @@
package org.eclipse.jgit.internal.storage.reftable;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;
import java.util.concurrent.locks.ReentrantLock;
import org.eclipse.jgit.annotations.Nullable;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.RefDatabase;
import org.eclipse.jgit.lib.ReflogReader;
import org.eclipse.jgit.transport.ReceiveCommand;
/**
* Operations on {@link MergedReftable} that is common to various reftable-using
* subclasses of {@link RefDatabase}. See
* {@link org.eclipse.jgit.internal.storage.dfs.DfsReftableDatabase} for an
* example.
*/
public abstract class ReftableDatabase {
// Protects mergedTables.
private final ReentrantLock lock = new ReentrantLock(true);
private Reftable mergedTables;
/**
* ReftableDatabase lazily initializes its merged reftable on the first read after
* construction or clearCache() call. This function should always instantiate a new
* MergedReftable based on the list of reftables specified by the underlying storage.
*
* @return the ReftableStack for this instance
* @throws IOException
* on I/O problems.
*/
abstract protected MergedReftable openMergedReftable() throws IOException;
/**
* @return the next available logical timestamp for an additional reftable
* in the stack.
* @throws java.io.IOException
* on I/O problems.
*/
public long nextUpdateIndex() throws IOException {
lock.lock();
try {
return reader().maxUpdateIndex() + 1;
} finally {
lock.unlock();
}
}
/**
* @return a ReflogReader for the given ref
* @param refname
* the name of the ref.
* @throws IOException
* on I/O problems
*/
public ReflogReader getReflogReader(String refname) throws IOException {
lock.lock();
try {
return new ReftableReflogReader(lock, reader(), refname);
} finally {
lock.unlock();
}
}
/**
* @return a ReceiveCommand for the change from oldRef to newRef
* @param oldRef
* a ref
* @param newRef
* a ref
*/
public static ReceiveCommand toCommand(Ref oldRef, Ref newRef) {
ObjectId oldId = toId(oldRef);
ObjectId newId = toId(newRef);
String name = oldRef != null ? oldRef.getName() : newRef.getName();
if (oldRef != null && oldRef.isSymbolic()) {
if (newRef != null) {
if (newRef.isSymbolic()) {
return ReceiveCommand.link(oldRef.getTarget().getName(),
newRef.getTarget().getName(), name);
} else {
// This should pass in oldId for compat with
// RefDirectoryUpdate
return ReceiveCommand.unlink(oldRef.getTarget().getName(),
newId, name);
}
} else {
return ReceiveCommand.unlink(oldRef.getTarget().getName(),
ObjectId.zeroId(), name);
}
}
if (newRef != null && newRef.isSymbolic()) {
if (oldRef != null) {
if (oldRef.isSymbolic()) {
return ReceiveCommand.link(oldRef.getTarget().getName(),
newRef.getTarget().getName(), name);
} else {
return ReceiveCommand.link(oldId,
newRef.getTarget().getName(), name);
}
} else {
return ReceiveCommand.link(ObjectId.zeroId(),
newRef.getTarget().getName(), name);
}
}
return new ReceiveCommand(oldId, newId, name);
}
private static ObjectId toId(Ref ref) {
if (ref != null) {
ObjectId id = ref.getObjectId();
if (id != null) {
return id;
}
}
return ObjectId.zeroId();
}
/**
* @return the lock protecting underlying ReftableReaders against concurrent
* reads.
*/
public ReentrantLock getLock() {
return lock;
}
/**
* @return the merged reftable that is implemented by the stack of
* reftables. Return value must be accessed under lock.
* @throws IOException
* on I/O problems
*/
private Reftable reader() throws IOException {
assert lock.isLocked();
if (mergedTables == null) {
mergedTables = openMergedReftable();
}
return mergedTables;
}
/**
* @return whether the given refName would be illegal in a repository that
* uses loose refs.
* @param refName
* the name to check
* @param added
* a sorted set of refs we pretend have been added to the
* database.
* @param deleted
* a set of refs we pretend have been removed from the database.
* @throws IOException
* on I/O problems
*/
public boolean isNameConflicting(String refName, TreeSet<String> added,
Set<String> deleted) throws IOException {
lock.lock();
try {
Reftable table = reader();
// Cannot be nested within an existing reference.
int lastSlash = refName.lastIndexOf('/');
while (0 < lastSlash) {
String prefix = refName.substring(0, lastSlash);
if (!deleted.contains(prefix)
&& (table.hasRef(prefix) || added.contains(prefix))) {
return true;
}
lastSlash = refName.lastIndexOf('/', lastSlash - 1);
}
// Cannot be the container of an existing reference.
String prefix = refName + '/';
RefCursor c = table.seekRefsWithPrefix(prefix);
while (c.next()) {
if (!deleted.contains(c.getRef().getName())) {
return true;
}
}
String it = added.ceiling(refName + '/');
if (it != null && it.startsWith(prefix)) {
return true;
}
return false;
} finally {
lock.unlock();
}
}
/**
* Read a single reference.
* <p>
* This method expects an unshortened reference name and does not search
* using the standard search path.
*
* @param name
* the unabbreviated name of the reference.
* @return the reference (if it exists); else {@code null}.
* @throws java.io.IOException
* the reference space cannot be accessed.
*/
@Nullable
public Ref exactRef(String name) throws IOException {
lock.lock();
try {
Reftable table = reader();
Ref ref = table.exactRef(name);
if (ref != null && ref.isSymbolic()) {
return table.resolve(ref);
}
return ref;
} finally {
lock.unlock();
}
}
/**
* Returns refs whose names start with a given prefix.
*
* @param prefix
* string that names of refs should start with; may be empty (to
* return all refs).
* @return immutable list of refs whose names start with {@code prefix}.
* @throws java.io.IOException
* the reference space cannot be accessed.
*/
public List<Ref> getRefsByPrefix(String prefix) throws IOException {
List<Ref> all = new ArrayList<>();
lock.lock();
try {
Reftable table = reader();
try (RefCursor rc = RefDatabase.ALL.equals(prefix) ? table.allRefs()
: table.seekRefsWithPrefix(prefix)) {
while (rc.next()) {
Ref ref = table.resolve(rc.getRef());
if (ref != null && ref.getObjectId() != null) {
all.add(ref);
}
}
}
} finally {
lock.unlock();
}
return Collections.unmodifiableList(all);
}
/**
* Returns all refs that resolve directly to the given {@link ObjectId}.
* Includes peeled {@linkObjectId}s.
*
* @param id
* {@link ObjectId} to resolve
* @return a {@link Set} of {@link Ref}s whose tips point to the provided
* id.
* @throws java.io.IOException
* on I/O errors.
*/
public Set<Ref> getTipsWithSha1(ObjectId id) throws IOException {
lock.lock();
try {
RefCursor cursor = reader().byObjectId(id);
Set<Ref> refs = new HashSet<>();
while (cursor.next()) {
refs.add(cursor.getRef());
}
return refs;
} finally {
lock.unlock();
}
}
/**
* Drops all data that might be cached in memory.
*/
public void clearCache() {
lock.lock();
try {
mergedTables = null;
} finally {
lock.unlock();
}
}
}
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