Package org.iq80.leveldb

Examples of org.iq80.leveldb.Options

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    @Test
    public void testMinorCompactionsHappen()
            throws Exception
    {
        DbStringWrapper db = new DbStringWrapper(new Options().writeBufferSize(10000), databaseDir);

        int n = 500;
        int startingNumTables = db.totalTableFiles();
        for (int i = 0; i < n; i++) {
            db.put(key(i), key(i) + longString(1000, 'v'));
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    @Test
    public void testRecoverWithLargeLog()
            throws Exception
    {
        DbStringWrapper db = new DbStringWrapper(new Options(), databaseDir);
        db.put("big1", longString(200000, '1'));
        db.put("big2", longString(200000, '2'));
        db.put("small3", longString(10, '3'));
        db.put("small4", longString(10, '4'));
        assertEquals(db.numberOfFilesInLevel(0), 0);

        db.reopen(new Options().writeBufferSize(100000));
        assertEquals(db.numberOfFilesInLevel(0), 3);
        assertEquals(db.get("big1"), longString(200000, '1'));
        assertEquals(db.get("big2"), longString(200000, '2'));
        assertEquals(db.get("small3"), longString(10, '3'));
        assertEquals(db.get("small4"), longString(10, '4'));
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    @Test
    public void testCompactionsGenerateMultipleFiles()
            throws Exception
    {
        DbStringWrapper db = new DbStringWrapper(new Options().writeBufferSize(100000000), databaseDir);

        // Write 8MB (80 values, each 100K)
        assertEquals(db.numberOfFilesInLevel(0), 0);
        assertEquals(db.numberOfFilesInLevel(1), 0);
        Random random = new Random(301);
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    @Test
    public void testRepeatedWritesToSameKey()
            throws Exception
    {
        Options options = new Options().writeBufferSize(100000);
        DbStringWrapper db = new DbStringWrapper(options, databaseDir);

        // We must have at most one file per level except for level-0,
        // which may have up to kL0_StopWritesTrigger files.
        int maxFiles = NUM_LEVELS + DbConstants.L0_STOP_WRITES_TRIGGER;

        Random random = new Random(301);
        String value = randomString(random, 2 * options.writeBufferSize());
        for (int i = 0; i < 5 * maxFiles; i++) {
            db.put("key", value);
            assertTrue(db.totalTableFiles() < maxFiles);
        }

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    @Test
    public void testSparseMerge()
            throws Exception
    {
        DbStringWrapper db = new DbStringWrapper(new Options().compressionType(NONE), databaseDir);

        fillLevels(db, "A", "Z");

        // Suppose there is:
        //    small amount of data with prefix A
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    @Test
    public void testApproximateSizes()
            throws Exception
    {
        DbStringWrapper db = new DbStringWrapper(new Options().writeBufferSize(100000000).compressionType(NONE), databaseDir);

        assertBetween(db.size("", "xyz"), 0, 0);
        db.reopen();
        assertBetween(db.size("", "xyz"), 0, 0);
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    @Test
    public void testApproximateSizesMixOfSmallAndLarge()
            throws Exception
    {
        DbStringWrapper db = new DbStringWrapper(new Options().compressionType(NONE), databaseDir);
        Random random = new Random(301);
        String big1 = randomString(random, 100000);
        db.put(key(0), randomString(random, 10000));
        db.put(key(1), randomString(random, 10000));
        db.put(key(2), big1);
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    @Test
    public void testIteratorPinsRef()
            throws Exception
    {
        DbStringWrapper db = new DbStringWrapper(new Options(), databaseDir);
        db.put("foo", "hello");

        SeekingIterator<String, String> iterator = db.iterator();

        db.put("foo", "newvalue1");
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    @Test
    public void testSnapshot()
            throws Exception
    {
        DbStringWrapper db = new DbStringWrapper(new Options(), databaseDir);
        db.put("foo", "v1");
        Snapshot s1 = db.getSnapshot();
        db.put("foo", "v2");
        Snapshot s2 = db.getSnapshot();
        db.put("foo", "v3");
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    @Test
    public void testHiddenValuesAreRemoved()
            throws Exception
    {
        DbStringWrapper db = new DbStringWrapper(new Options(), databaseDir);
        Random random = new Random(301);
        fillLevels(db, "a", "z");

        String big = randomString(random, 50000);
        db.put("foo", big);
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