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- /*
- * Copyright (C) 2012, Christian Halstrick <christian.halstrick@sap.com> 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.file;
-
- import static java.lang.Integer.valueOf;
- import static org.junit.Assert.assertEquals;
- import static org.junit.Assert.assertNotEquals;
- import static org.junit.Assert.assertNotNull;
- import static org.junit.Assert.assertTrue;
- import static org.junit.Assert.fail;
-
- import java.io.IOException;
- import java.util.Collection;
- import java.util.Collections;
- import java.util.concurrent.BrokenBarrierException;
- import java.util.concurrent.Callable;
- import java.util.concurrent.CountDownLatch;
- import java.util.concurrent.CyclicBarrier;
- import java.util.concurrent.ExecutionException;
- import java.util.concurrent.ExecutorService;
- import java.util.concurrent.Executors;
- import java.util.concurrent.Future;
- import java.util.concurrent.TimeUnit;
-
- import org.eclipse.jgit.errors.CancelledException;
- import org.eclipse.jgit.internal.JGitText;
- import org.eclipse.jgit.internal.storage.pack.PackWriter;
- import org.eclipse.jgit.junit.TestRepository;
- import org.eclipse.jgit.lib.ConfigConstants;
- import org.eclipse.jgit.lib.EmptyProgressMonitor;
- import org.eclipse.jgit.lib.NullProgressMonitor;
- import org.eclipse.jgit.lib.ObjectId;
- import org.eclipse.jgit.lib.Sets;
- import org.eclipse.jgit.revwalk.RevBlob;
- import org.eclipse.jgit.revwalk.RevCommit;
- import org.eclipse.jgit.storage.file.FileBasedConfig;
- import org.eclipse.jgit.test.resources.SampleDataRepositoryTestCase;
- import org.junit.Test;
-
- public class GcConcurrentTest extends GcTestCase {
- @Test
- public void concurrentRepack() throws Exception {
- final CyclicBarrier syncPoint = new CyclicBarrier(2);
-
- class DoRepack extends EmptyProgressMonitor implements
- Callable<Integer> {
-
- @Override
- public void beginTask(String title, int totalWork) {
- if (title.equals(JGitText.get().writingObjects)) {
- try {
- syncPoint.await();
- } catch (InterruptedException e) {
- Thread.currentThread().interrupt();
- } catch (BrokenBarrierException ignored) {
- //
- }
- }
- }
-
- /** @return 0 for success, 1 in case of error when writing pack */
- @Override
- public Integer call() throws Exception {
- try {
- gc.setProgressMonitor(this);
- gc.repack();
- return valueOf(0);
- } catch (IOException e) {
- // leave the syncPoint in broken state so any awaiting
- // threads and any threads that call await in the future get
- // the BrokenBarrierException
- Thread.currentThread().interrupt();
- try {
- syncPoint.await();
- } catch (InterruptedException ignored) {
- //
- }
- return valueOf(1);
- }
- }
- }
-
- RevBlob a = tr.blob("a");
- tr.lightweightTag("t", a);
-
- ExecutorService pool = Executors.newFixedThreadPool(2);
- try {
- DoRepack repack1 = new DoRepack();
- DoRepack repack2 = new DoRepack();
- Future<Integer> result1 = pool.submit(repack1);
- Future<Integer> result2 = pool.submit(repack2);
- assertEquals(0, result1.get().intValue() + result2.get().intValue());
- } finally {
- pool.shutdown();
- pool.awaitTermination(Long.MAX_VALUE, TimeUnit.SECONDS);
- }
- }
-
- @Test
- public void repackAndGetStats() throws Exception {
- TestRepository<FileRepository>.BranchBuilder test = tr.branch("test");
- test.commit().add("a", "a").create();
- GC gc1 = new GC(tr.getRepository());
- gc1.setPackExpireAgeMillis(0);
- gc1.gc();
- test.commit().add("b", "b").create();
-
- // Create a new Repository instance and trigger a gc
- // from that instance. Reusing the existing repo instance
- // tr.getRepository() would not show the problem.
- FileRepository r2 = new FileRepository(
- tr.getRepository().getDirectory());
- GC gc2 = new GC(r2);
- gc2.setPackExpireAgeMillis(0);
- gc2.gc();
-
- new GC(tr.getRepository()).getStatistics();
- }
-
- @Test
- public void repackAndUploadPack() throws Exception {
- TestRepository<FileRepository>.BranchBuilder test = tr.branch("test");
- // RevCommit a = test.commit().add("a", "a").create();
- test.commit().add("a", "a").create();
-
- GC gc1 = new GC(tr.getRepository());
- gc1.setPackExpireAgeMillis(0);
- gc1.gc();
-
- RevCommit b = test.commit().add("b", "b").create();
-
- FileRepository r2 = new FileRepository(
- tr.getRepository().getDirectory());
- GC gc2 = new GC(r2);
- gc2.setPackExpireAgeMillis(0);
- gc2.gc();
-
- // Simulate parts of an UploadPack. This is the situation on
- // server side (e.g. gerrit) when clients are
- // cloning/fetching while the server side repo's
- // are gc'ed by an external process (e.g. scheduled
- // native git gc)
- try (PackWriter pw = new PackWriter(tr.getRepository())) {
- pw.setUseBitmaps(true);
- pw.preparePack(NullProgressMonitor.INSTANCE, Sets.of(b),
- Collections.<ObjectId> emptySet());
- new GC(tr.getRepository()).getStatistics();
- }
- }
-
- Pack getSinglePack(FileRepository r) {
- Collection<Pack> packs = r.getObjectDatabase().getPacks();
- assertEquals(1, packs.size());
- return packs.iterator().next();
- }
-
- @Test
- public void repackAndCheckBitmapUsage() throws Exception {
- // create a test repository with one commit and pack all objects. After
- // packing create loose objects to trigger creation of a new packfile on
- // the next gc
- TestRepository<FileRepository>.BranchBuilder test = tr.branch("test");
- test.commit().add("a", "a").create();
- FileRepository repository = tr.getRepository();
- GC gc1 = new GC(repository);
- gc1.setPackExpireAgeMillis(0);
- gc1.gc();
- String oldPackName = getSinglePack(repository).getPackName();
- RevCommit b = test.commit().add("b", "b").create();
-
- // start the garbage collection on a new repository instance,
- FileRepository repository2 = new FileRepository(repository.getDirectory());
- GC gc2 = new GC(repository2);
- gc2.setPackExpireAgeMillis(0);
- gc2.gc();
- String newPackName = getSinglePack(repository2).getPackName();
- // make sure gc() has caused creation of a new packfile
- assertNotEquals(oldPackName, newPackName);
-
- // Even when asking again for the set of packfiles outdated data
- // will be returned. As long as the repository can work on cached data
- // it will do so and not detect that a new packfile exists.
- assertNotEquals(getSinglePack(repository).getPackName(), newPackName);
-
- // Only when accessing object content it is required to rescan the pack
- // directory and the new packfile will be detected.
- repository.getObjectDatabase().open(b).getSize();
- assertEquals(getSinglePack(repository).getPackName(), newPackName);
- assertNotNull(getSinglePack(repository).getBitmapIndex());
- }
-
- @Test
- public void testInterruptGc() throws Exception {
- FileBasedConfig c = repo.getConfig();
- c.setInt(ConfigConstants.CONFIG_GC_SECTION, null,
- ConfigConstants.CONFIG_KEY_AUTOPACKLIMIT, 1);
- c.save();
- SampleDataRepositoryTestCase.copyCGitTestPacks(repo);
- ExecutorService executor = Executors.newSingleThreadExecutor();
- final CountDownLatch latch = new CountDownLatch(1);
- Future<Collection<Pack>> result = executor.submit(() -> {
- long start = System.currentTimeMillis();
- System.out.println("starting gc");
- latch.countDown();
- Collection<Pack> r = gc.gc();
- System.out.println(
- "gc took " + (System.currentTimeMillis() - start) + " ms");
- return r;
- });
- try {
- latch.await();
- Thread.sleep(5);
- executor.shutdownNow();
- result.get();
- fail("thread wasn't interrupted");
- } catch (ExecutionException e) {
- Throwable cause = e.getCause();
- if (cause instanceof CancelledException) {
- assertEquals(JGitText.get().operationCanceled,
- cause.getMessage());
- } else if (cause instanceof IOException) {
- Throwable cause2 = cause.getCause();
- assertTrue(cause2 instanceof InterruptedException
- || cause2 instanceof ExecutionException);
- } else {
- fail("unexpected exception " + e);
- }
- }
- }
- }
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