Package org.iq80.leveldb

Examples of org.iq80.leveldb.Snapshot

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      }
      try {
         if (stopped) {
            throw new PersistenceException("LevelDB is stopped");
         }
         DBIterator it = db.iterator(new ReadOptions().fillCache(false));
         if (configuration.clearThreshold() <= 0) {
            try {
               for (it.seekToFirst(); it.hasNext(); ) {
                  Map.Entry<byte[], byte[]> entry = it.next();
                  db.delete(entry.getKey());
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      }
      try {
         if (stopped) {
            throw new PersistenceException("LevelDB is stopped");
         }
         DBIterator it = db.iterator(new ReadOptions().fillCache(false));
         try {
            for (it.seekToFirst(); it.hasNext(); ) {
               Map.Entry<byte[], byte[]> entry = it.next();
               entries.add(entry);
               if (entries.size() == batchSize) {
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            }
         }

         List<Long> times = new ArrayList<Long>();
         List<Object> keys = new ArrayList<Object>();
         DBIterator it = expiredDb.iterator(new ReadOptions().fillCache(false));
         long now = ctx.getTimeService().wallClockTime();
         try {
            for (it.seekToFirst(); it.hasNext();) {
               Map.Entry<byte[], byte[]> entry = it.next();
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    @Override
    public byte[] get(byte[] key)
            throws DBException
    {
        return get(key, new ReadOptions());
    }
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    }

    @Override
    public SeekingIteratorAdapter iterator()
    {
        return iterator(new ReadOptions());
    }
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        // 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");
            Snapshot s1 = db.getSnapshot();
            db.put(key, "v2");
            assertEquals(db.get(key), "v2");
            assertEquals(db.get(key, s1), "v1");

            db.compactMemTable();
            assertEquals(db.get(key), "v2");
            assertEquals(db.get(key, s1), "v1");
            s1.close();
        }
    }
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    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");
        Snapshot s3 = db.getSnapshot();

        db.put("foo", "v4");

        assertEquals("v1", db.get("foo", s1));
        assertEquals("v2", db.get("foo", s2));
        assertEquals("v3", db.get("foo", s3));
        assertEquals("v4", db.get("foo"));

        s3.close();
        assertEquals("v1", db.get("foo", s1));
        assertEquals("v2", db.get("foo", s2));
        assertEquals("v4", db.get("foo"));

        s1.close();
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        String big = randomString(random, 50000);
        db.put("foo", big);
        db.put("pastFoo", "v");

        Snapshot snapshot = db.getSnapshot();

        db.put("foo", "tiny");
        db.put("pastFoo2", "v2");  // Advance sequence number one more

        db.compactMemTable();
        assertTrue(db.numberOfFilesInLevel(0) > 0);

        assertEquals(big, db.get("foo", snapshot));
        assertBetween(db.size("", "pastFoo"), 50000, 60000);
        snapshot.close();
        assertEquals(db.allEntriesFor("foo"), asList("tiny", big));
        db.compactRange(0, "", "x");
        assertEquals(db.allEntriesFor("foo"), asList("tiny"));
        assertEquals(db.numberOfFilesInLevel(0), 0);
        assertTrue(db.numberOfFilesInLevel(1) >= 1);
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    @Override
    public void put(byte[] key, byte[] value)
            throws DBException
    {
        put(key, value, new WriteOptions());
    }
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    @Override
    public void delete(byte[] key)
            throws DBException
    {
        writeInternal(new WriteBatchImpl().delete(key), new WriteOptions());
    }
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