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.NonNullByDefault;
22 import org.eclipse.jdt.annotation.Nullable;
25 * A {@link JournalReader} backed by a {@link ByteBufReader}.
28 final class SegmentedJournalReader<E> implements JournalReader<E> {
29 private final ByteBufMapper<E> mapper;
30 private final ByteBufReader reader;
32 SegmentedJournalReader(final ByteBufReader reader, final ByteBufMapper<E> mapper) {
33 this.reader = requireNonNull(reader);
34 this.mapper = requireNonNull(mapper);
38 public long getNextIndex() {
39 return reader.nextIndex();
48 public void reset(final long index) {
53 public <T> @Nullable T tryNext(final EntryMapper<E, T> entryMapper) {
54 return reader.tryNext((index, buf) -> {
55 final var size = buf.readableBytes();
56 return requireNonNull(entryMapper.mapEntry(index, mapper.bytesToObject(index, buf), size));