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/*
* Copyright (C) 2019, Google Inc. and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
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;
}
}
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