Package org.iq80.leveldb

Examples of org.iq80.leveldb.Options

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    @Test
    public void testGetSnapshot()
            throws Exception
    {
        DbStringWrapper db = new DbStringWrapper(new Options(), databaseDir);

        // Try with both a short key and a long key
        for (int i = 0; i < 2; i++) {
            String key = (i == 0) ? "foo" : longString(200, 'x');
            db.put(key, "v1");
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    @Test
    public void testGetLevel0Ordering()
            throws Exception
    {
        DbStringWrapper db = new DbStringWrapper(new Options(), databaseDir);

        // Check that we process level-0 files in correct order.  The code
        // below generates two level-0 files where the earlier one comes
        // before the later one in the level-0 file list since the earlier
        // one has a smaller "smallest" key.
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    @Test
    public void testGetOrderedByLevels()
            throws Exception
    {
        DbStringWrapper db = new DbStringWrapper(new Options(), databaseDir);
        db.put("foo", "v1");
        db.compact("a", "z");
        assertEquals(db.get("foo"), "v1");
        db.put("foo", "v2");
        assertEquals(db.get("foo"), "v2");
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    @Test
    public void testGetPicksCorrectFile()
            throws Exception
    {
        DbStringWrapper db = new DbStringWrapper(new Options(), databaseDir);
        db.put("a", "va");
        db.compact("a", "b");
        db.put("x", "vx");
        db.compact("x", "y");
        db.put("f", "vf");
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    @Test
    public void testEmptyIterator()
            throws Exception
    {
        DbStringWrapper db = new DbStringWrapper(new Options(), databaseDir);
        SeekingIterator<String, String> iterator = db.iterator();

        iterator.seekToFirst();
        assertNoNextElement(iterator);
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    @Test
    public void testIteratorSingle()
            throws Exception
    {
        DbStringWrapper db = new DbStringWrapper(new Options(), databaseDir);
        db.put("a", "va");

        assertSequence(db.iterator(), immutableEntry("a", "va"));
    }
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    @Test
    public void testIteratorMultiple()
            throws Exception
    {
        DbStringWrapper db = new DbStringWrapper(new Options(), databaseDir);
        db.put("a", "va");
        db.put("b", "vb");
        db.put("c", "vc");

        SeekingIterator<String, String> iterator = db.iterator();
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    @Test
    public void testRecover()
            throws Exception
    {
        DbStringWrapper db = new DbStringWrapper(new Options(), databaseDir);
        db.put("foo", "v1");
        db.put("baz", "v5");

        db.reopen();
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    @Test
    public void testRecoveryWithEmptyLog()
            throws Exception
    {
        DbStringWrapper db = new DbStringWrapper(new Options(), databaseDir);
        db.put("foo", "v1");
        db.put("foo", "v2");
        db.reopen();
        db.reopen();
        db.put("foo", "v3");
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    @Test
    public void testRecoverDuringMemtableCompaction()
            throws Exception
    {
        DbStringWrapper db = new DbStringWrapper(new Options().writeBufferSize(1000000), databaseDir);

        // Trigger a long memtable compaction and reopen the database during it
        db.put("foo", "v1");                        // Goes to 1st log file
        db.put("big1", longString(10000000, 'x'));  // Fills memtable
        db.put("big2", longString(1000, 'y'));      // Triggers compaction
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