org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/GcKeepFilesTest.java

/*
 * Copyright (C) 2012, Christian Halstrick <christian.halstrick@sap.com>
 * 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
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 *   with the distribution.
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package org.eclipse.jgit.internal.storage.file;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

import java.io.File;
import java.util.Iterator;

import org.eclipse.jgit.internal.storage.file.PackIndex.MutableEntry;
import org.eclipse.jgit.junit.TestRepository.BranchBuilder;
import org.junit.Test;

public class GcKeepFilesTest extends GcTestCase {
	@Test
	public void testKeepFiles() throws Exception {
		BranchBuilder bb = tr.branch("refs/heads/master");
		bb.commit().add("A", "A").add("B", "B").create();
		stats = gc.getStatistics();
		assertEquals(4, stats.numberOfLooseObjects);
		assertEquals(0, stats.numberOfPackedObjects);
		assertEquals(0, stats.numberOfPackFiles);
		gc.gc();
		stats = gc.getStatistics();
		assertEquals(0, stats.numberOfLooseObjects);
		assertEquals(4, stats.numberOfPackedObjects);
		assertEquals(1, stats.numberOfPackFiles);

		Iterator<PackFile> packIt = repo.getObjectDatabase().getPacks()
				.iterator();
		PackFile singlePack = packIt.next();
		assertFalse(packIt.hasNext());
		String packFileName = singlePack.getPackFile().getPath();
		String keepFileName = packFileName.substring(0,
				packFileName.lastIndexOf('.')) + ".keep";
		File keepFile = new File(keepFileName);
		assertFalse(keepFile.exists());
		assertTrue(keepFile.createNewFile());
		bb.commit().add("A", "A2").add("B", "B2").create();
		stats = gc.getStatistics();
		assertEquals(4, stats.numberOfLooseObjects);
		assertEquals(4, stats.numberOfPackedObjects);
		assertEquals(1, stats.numberOfPackFiles);
		gc.gc();
		stats = gc.getStatistics();
		assertEquals(0, stats.numberOfLooseObjects);
		assertEquals(8, stats.numberOfPackedObjects);
		assertEquals(2, stats.numberOfPackFiles);

		// check that no object is packed twice
		Iterator<PackFile> packs = repo.getObjectDatabase().getPacks()
				.iterator();
		PackIndex ind1 = packs.next().getIndex();
		assertEquals(4, ind1.getObjectCount());
		PackIndex ind2 = packs.next().getIndex();
		assertEquals(4, ind2.getObjectCount());
		for (MutableEntry e: ind1)
			if (ind2.hasObject(e.toObjectId()))
				assertFalse(
						"the following object is in both packfiles: "
								+ e.toObjectId(),
						ind2.hasObject(e.toObjectId()));
	}
}