Package org.iq80.leveldb

Examples of org.iq80.leveldb.DB

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        // close the block
        Slice raw = blockBuilder.finish();

        // attempt to compress the block
        Slice blockContents = raw;
        CompressionType blockCompressionType = CompressionType.NONE;
        if (compressionType == CompressionType.SNAPPY) {
            ensureCompressedOutputCapacity(maxCompressedLength(raw.length()));
            try {
                int compressedSize = Snappy.compress(raw.getRawArray(), raw.getRawOffset(), raw.length(), compressedOutput.getRawArray(), 0);
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    }

    public static BlockTrailer readBlockTrailer(Slice slice)
    {
        SliceInput sliceInput = slice.input();
        CompressionType compressionType = CompressionType.getCompressionTypeByPersistentId(sliceInput.readUnsignedByte());
        int crc32c = sliceInput.readInt();
        return new BlockTrailer(compressionType, crc32c);
    }
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  public WriteOptions getWriteOptions() {
    return writeOptions;
  }

  public DB getTable(String tableName) throws IOException {
    DB db = tables.get(tableName);
    if (db == null) {
      synchronized (tables) {
        db = tables.get(tableName);
        if (db == null) {
          db = openTable(tableName);
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    }
    return db;
  }

  public void ensureTableExists(String tableName) throws IOException {
    DB db = tables.get(tableName);
    if (db == null) {
      synchronized (tables) {
        db = tables.get(tableName);
        if (db == null) {
          createTable(tableName);
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    // throw the exception ourselves.
    File dbDir = new File(dbPath);
    if (!dbDir.exists()) {
      throw new IOException("Database " + dbPath + " does not exist and the create if missing option is disabled");
    }
    DB db = factory.open(dbDir, options);
    tables.put(tableName, db);
    return db;
  }
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    options.errorIfExists(false);
    options.comparator(new KeyValueDBComparator());
    options.blockSize(blockSize);
    options.cacheSize(cacheSize);

    DB db = factory.open(new File(dbPath), options);
    tables.put(name, db);
  }
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    DB db = factory.open(new File(dbPath), options);
    tables.put(name, db);
  }

  public void dropTable(String name) throws IOException {
    DB db = tables.remove(name);
    if (db != null) {
      db.close();
    }
    String dbPath = getDBPath(basePath, name);
    factory.destroy(new File(dbPath), new Options());
  }
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    persist(ImmutableMap.of(row, replacing), System.currentTimeMillis());
    return result;
  }

  public void persist(Map<byte[], ? extends Map<byte[], byte[]>> changes, long version) throws IOException {
    DB db = getDB();
    // todo support writing null when no transaction
    WriteBatch batch = db.createWriteBatch();
    for (Map.Entry<byte[], ? extends Map<byte[], byte[]>> row : changes.entrySet()) {
      for (Map.Entry<byte[], byte[]> column : row.getValue().entrySet()) {
        byte[] key = createPutKey(row.getKey(), column.getKey(), version);
        batch.put(key, column.getValue() == null ? DELETE_MARKER : column.getValue());
      }
    }
    db.write(batch, service.getWriteOptions());
  }
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  public void undo(Map<byte[], ? extends Map<byte[], ?>> persisted, long version) throws IOException {
    if (persisted.isEmpty()) {
      return;
    }
    DB db = getDB();
    WriteBatch batch = db.createWriteBatch();
    for (Map.Entry<byte[], ? extends Map<byte[], ?>> row : persisted.entrySet()) {
      for (Map.Entry<byte[], ?> column : row.getValue().entrySet()) {
        byte[] key = createPutKey(row.getKey(), column.getKey(), version);
        batch.delete(key);
      }
    }
    db.write(batch, service.getWriteOptions());
  }
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    return new ImmutablePair<byte[], NavigableMap<byte[], byte[]>>(rowBeingRead, map);
  }

  public void deleteRows(byte[] prefix) throws IOException {
    Preconditions.checkNotNull(prefix, "prefix must not be null");
    DB db = getDB();
    WriteBatch batch = db.createWriteBatch();
    DBIterator iterator = db.iterator();
    try {
      iterator.seek(createStartKey(prefix));
      while (iterator.hasNext()) {
        Map.Entry<byte[], byte[]> entry = iterator.next();
        if (!Bytes.startsWith(KeyValue.fromKey(entry.getKey()).getRow(), prefix)) {
          // iterator is past prefix
          break;
        }
        batch.delete(entry.getKey());
      }
      db.write(batch);
    } finally {
      iterator.close();
    }
  }
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