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/*
* Copyright (C) 2023, Google Inc.
*
* 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.revwalk;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import java.util.List;
import org.eclipse.jgit.internal.storage.file.FileRepository;
import org.eclipse.jgit.internal.storage.file.GC;
import org.eclipse.jgit.junit.LocalDiskRepositoryTestCase;
import org.eclipse.jgit.junit.TestRepository;
import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.BitmapIndex;
import org.eclipse.jgit.lib.BitmapIndex.Bitmap;
import org.eclipse.jgit.lib.BitmapIndex.BitmapBuilder;
import org.eclipse.jgit.lib.BitmapIndex.BitmapLookupListener;
import org.eclipse.jgit.lib.NullProgressMonitor;
import org.eclipse.jgit.lib.ObjectReader;
import org.junit.Before;
import org.junit.Test;
public class BitmapWalkerTest extends LocalDiskRepositoryTestCase {
private static final String MAIN = "refs/heads/main";
TestRepository<FileRepository> repo;
RevCommit tipWithBitmap;
@Override
@Before
public void setUp() throws Exception {
super.setUp();
FileRepository db = createWorkRepository();
repo = new TestRepository<>(db);
RevCommit base = repo.commit().create();
RevCommit one = repo.commit().parent(base).create();
tipWithBitmap = repo.commit().parent(one).create();
repo.update(MAIN, tipWithBitmap);
GC gc = new GC(repo.getRepository());
gc.setAuto(false);
gc.gc().get();
assertNotNull(repo.getRevWalk().getObjectReader().getBitmapIndex());
}
private static class BitmapWalkCounter implements BitmapLookupListener {
int withBitmap;
int withoutBitmap;
@Override
public void onBitmapFound(AnyObjectId oid) {
withBitmap += 1;
}
@Override
public void onBitmapNotFound(AnyObjectId oid) {
withoutBitmap += 1;
}
}
@Test
public void counters_bitmapAtTip() throws Exception {
try (RevWalk rw = repo.getRevWalk();
ObjectReader or = rw.getObjectReader()) {
BitmapWalkCounter counter = new BitmapWalkCounter();
BitmapIndex bitmapIndex = or.getBitmapIndex();
bitmapIndex.addBitmapLookupListener(counter);
BitmapWalker bw = new BitmapWalker(rw.toObjectWalkWithSameObjects(),
bitmapIndex, NullProgressMonitor.INSTANCE);
BitmapBuilder bitmap = bw.findObjects(List.of(tipWithBitmap), null,
true);
// First commit has a tree, so in total 4 objects
assertEquals(4, bitmap.cardinality());
assertEquals(1, counter.withBitmap);
assertEquals(0, counter.withoutBitmap);
assertEquals(0, bw.getCountOfBitmapIndexMisses());
}
}
@Test
public void counters_bitmapAfterAStep() throws Exception {
System.out.println("Old tip: " + tipWithBitmap);
RevCommit newTip = repo.commit().parent(tipWithBitmap).create();
System.out.println("New tip: " + newTip);
try (RevWalk rw = repo.getRevWalk();
ObjectReader or = rw.getObjectReader()) {
BitmapWalkCounter counter = new BitmapWalkCounter();
BitmapIndex bitmapIndex = or.getBitmapIndex();
bitmapIndex.addBitmapLookupListener(counter);
BitmapWalker bw = new BitmapWalker(rw.toObjectWalkWithSameObjects(),
bitmapIndex, NullProgressMonitor.INSTANCE);
bw.findObjects(List.of(newTip), null, true);
assertEquals(1, counter.withBitmap);
// It checks bitmap before marking as interesting, and again in the
// walk
assertEquals(2, counter.withoutBitmap);
assertEquals(1, bw.getCountOfBitmapIndexMisses());
}
}
@Test
public void counters_bitmapAfterThreeSteps() throws Exception {
RevCommit newOne = repo.commit().parent(tipWithBitmap).create();
RevCommit newTwo = repo.commit().parent(newOne).create();
RevCommit newTip = repo.commit().parent(newTwo).create();
try (RevWalk rw = repo.getRevWalk();
ObjectReader or = rw.getObjectReader()) {
BitmapWalkCounter counter = new BitmapWalkCounter();
BitmapIndex bitmapIndex = or.getBitmapIndex();
bitmapIndex.addBitmapLookupListener(counter);
BitmapWalker bw = new BitmapWalker(rw.toObjectWalkWithSameObjects(),
bitmapIndex, NullProgressMonitor.INSTANCE);
bw.findObjects(List.of(newTip), null, true);
assertEquals(1, counter.withBitmap);
assertEquals(4, counter.withoutBitmap);
assertEquals(3, bw.getCountOfBitmapIndexMisses());
}
}
@Test
public void counters_bitmapAfterThreeStepsWithSeen() throws Exception {
RevCommit newOne = repo.commit().parent(tipWithBitmap).create();
RevCommit newTwo = repo.commit().parent(newOne).create();
RevCommit newTip = repo.commit().parent(newTwo).create();
try (RevWalk rw = repo.getRevWalk();
ObjectReader or = rw.getObjectReader()) {
BitmapIndex bitmapIndex = or.getBitmapIndex();
Bitmap seen = bitmapIndex.getBitmap(tipWithBitmap);
BitmapBuilder seenBB = bitmapIndex.newBitmapBuilder().or(seen);
BitmapWalkCounter counter = new BitmapWalkCounter();
bitmapIndex.addBitmapLookupListener(counter);
BitmapWalker bw = new BitmapWalker(rw.toObjectWalkWithSameObjects(),
bitmapIndex, NullProgressMonitor.INSTANCE);
bw.findObjects(List.of(newTip), seenBB, true);
assertEquals(0, counter.withBitmap);
assertEquals(4, counter.withoutBitmap);
assertEquals(3, bw.getCountOfBitmapIndexMisses());
}
}
}
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