2 * Copyright 2017-2022 Open Networking Foundation and others. All rights reserved.
3 * Copyright (c) 2024 PANTHEON.tech, s.r.o. and others.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
17 package io.atomix.storage.journal;
19 import static java.util.Objects.requireNonNull;
21 import org.eclipse.jdt.annotation.Nullable;
24 * A {@link JournalReader} backed by a {@link ByteBufReader}.
26 final class SegmentedJournalReader<E> implements JournalReader<E> {
27 private final ByteBufMapper<E> mapper;
28 private final ByteBufReader reader;
30 SegmentedJournalReader(final ByteBufReader reader, final ByteBufMapper<E> mapper) {
31 this.reader = requireNonNull(reader);
32 this.mapper = requireNonNull(mapper);
36 public long getFirstIndex() {
37 return reader.firstIndex();
41 public long getNextIndex() {
42 return reader.nextIndex();
51 public void reset(final long index) {
56 public <T> @Nullable T tryNext(final EntryMapper<E, T> entryMapper) {
57 return reader.tryNext(
58 (index, buf) -> requireNonNull(entryMapper.mapEntry(index, mapper.bytesToObject(buf), buf.readableBytes()))