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;
22 * A {@link JournalWriter} backed by a {@link ByteBufWriter}.
24 final class SegmentedJournalWriter<E> implements JournalWriter<E> {
25 private final ByteBufMapper<E> mapper;
26 private final ByteBufWriter writer;
28 SegmentedJournalWriter(final ByteBufWriter writer, final ByteBufMapper<E> mapper) {
29 this.writer = requireNonNull(writer);
30 this.mapper = requireNonNull(mapper);
34 public long getLastIndex() {
35 return writer.lastIndex();
39 public long getNextIndex() {
40 return writer.nextIndex();
44 public void reset(final long index) {
49 public void commit(final long index) {
54 public <T extends E> Indexed<T> append(final T entry) {
55 final var buf = mapper.objectToBytes(entry);
56 return new Indexed<>(writer.append(buf), entry, buf.readableBytes());
60 public void truncate(final long index) {
61 writer.truncate(index);