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dfs: test for repositories sharing blocks in DfsBlockCache

Simple test to verify two DfsRepository instances will reuse the same
DfsBlocks in the DfsBlockCache, even though the DfsStreamKey instance
is now different between their DfsPackFile instances.

Change-Id: I409c109142dea488d189b9ac0d3c319755dce7b4
stable-4.9
Shawn Pearce 7 years ago
parent
commit
3a072c8a7a
  1. 103
      org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsBlockCacheTest.java

103
org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsBlockCacheTest.java

@ -0,0 +1,103 @@
/*
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package org.eclipse.jgit.internal.storage.dfs;
import static org.eclipse.jgit.lib.Constants.OBJ_BLOB;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import org.eclipse.jgit.junit.TestRng;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectInserter;
import org.eclipse.jgit.lib.ObjectReader;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TestName;
public class DfsBlockCacheTest {
@Rule
public TestName testName = new TestName();
private TestRng rng;
private DfsBlockCache cache;
@Before
public void setUp() {
rng = new TestRng(testName.getMethodName());
DfsBlockCache.reconfigure(new DfsBlockCacheConfig()
.setBlockSize(512)
.setBlockLimit(1 << 20));
cache = DfsBlockCache.getInstance();
}
@Test
public void streamKeyReusesBlocks() throws Exception {
DfsRepositoryDescription repo = new DfsRepositoryDescription("test");
InMemoryRepository r1 = new InMemoryRepository(repo);
byte[] content = rng.nextBytes(424242);
ObjectId id;
try (ObjectInserter ins = r1.newObjectInserter()) {
id = ins.insert(OBJ_BLOB, content);
ins.flush();
}
long oldSize = cache.getCurrentSize();
assertTrue(oldSize > 2000);
assertEquals(0, cache.getHitCount());
List<DfsPackDescription> packs = r1.getObjectDatabase().listPacks();
InMemoryRepository r2 = new InMemoryRepository(repo);
r2.getObjectDatabase().commitPack(packs, Collections.emptyList());
try (ObjectReader rdr = r2.newObjectReader()) {
byte[] actual = rdr.open(id, OBJ_BLOB).getBytes();
assertTrue(Arrays.equals(content, actual));
}
assertEquals(0, cache.getMissCount());
assertEquals(oldSize, cache.getCurrentSize());
}
}
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