2 * Copyright (c) 2024 PANTHEON.tech, s.r.o. and others. All rights reserved.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
16 package io.atomix.storage.journal;
18 import java.nio.ByteBuffer;
19 import java.nio.file.Path;
22 * A {@link StorageLevel#MAPPED} implementation of {@link FileReader}. Operates on direct mapping of the entire file.
24 final class MappedFileReader extends FileReader {
25 private final ByteBuffer buffer;
27 MappedFileReader(final Path path, final ByteBuffer buffer) {
29 this.buffer = buffer.slice().asReadOnlyBuffer();
33 void invalidateCache() {
34 // No-op: the mapping is guaranteed to be coherent
38 ByteBuffer read(final int position, final int size) {
39 return buffer.slice(position, size);