--- /dev/null
+/*
+ * Copyright (C) 2017, Google Inc.
+ * 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
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ * names of its contributors may be used to endorse or promote
+ * products derived from this software without specific prior
+ * written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+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());
+ }
+}