| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| package org.apache.hadoop.hdds.utils.db; |
| |
| import java.io.IOException; |
| import java.util.NoSuchElementException; |
| import java.util.function.Consumer; |
| |
| import org.rocksdb.RocksIterator; |
| |
| /** |
| * RocksDB store iterator. |
| */ |
| public class RDBStoreIterator |
| implements TableIterator<byte[], ByteArrayKeyValue> { |
| |
| private RocksIterator rocksDBIterator; |
| |
| public RDBStoreIterator(RocksIterator iterator) { |
| this.rocksDBIterator = iterator; |
| rocksDBIterator.seekToFirst(); |
| } |
| |
| @Override |
| public void forEachRemaining( |
| Consumer<? super ByteArrayKeyValue> action) { |
| while (hasNext()) { |
| action.accept(next()); |
| } |
| } |
| |
| @Override |
| public boolean hasNext() { |
| return rocksDBIterator.isValid(); |
| } |
| |
| @Override |
| public ByteArrayKeyValue next() { |
| if (rocksDBIterator.isValid()) { |
| ByteArrayKeyValue value = |
| ByteArrayKeyValue.create(rocksDBIterator.key(), rocksDBIterator |
| .value()); |
| rocksDBIterator.next(); |
| return value; |
| } |
| throw new NoSuchElementException("RocksDB Store has no more elements"); |
| } |
| |
| @Override |
| public void seekToFirst() { |
| rocksDBIterator.seekToFirst(); |
| } |
| |
| @Override |
| public void seekToLast() { |
| rocksDBIterator.seekToLast(); |
| } |
| |
| @Override |
| public ByteArrayKeyValue seek(byte[] key) { |
| rocksDBIterator.seek(key); |
| if (rocksDBIterator.isValid()) { |
| return ByteArrayKeyValue.create(rocksDBIterator.key(), |
| rocksDBIterator.value()); |
| } |
| return null; |
| } |
| |
| @Override |
| public byte[] key() { |
| if (rocksDBIterator.isValid()) { |
| return rocksDBIterator.key(); |
| } |
| return null; |
| } |
| |
| @Override |
| public ByteArrayKeyValue value() { |
| if (rocksDBIterator.isValid()) { |
| return ByteArrayKeyValue.create(rocksDBIterator.key(), |
| rocksDBIterator.value()); |
| } |
| return null; |
| } |
| |
| @Override |
| public void close() throws IOException { |
| rocksDBIterator.close(); |
| } |
| } |