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MINOR Removed unused CommittedOffsetsFile class. (#15209) 

`CommittedOffsetsFile` can be introduced when it is required for enhancing TBRLMM to consume from a specific offset when snapshots are implemented.

Reviewers: Kamal Chandraprakash<kamal.chandraprakash@gmail.com>, Divij Vaidya <diviv@amazon.com>
This commit is contained in:
Satish Duggana 2024-02-12 17:35:01 +05:30 committed by GitHub
parent b9f1d59268
commit fc8b644e56
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storage/src/main/java/org/apache/kafka/server/log/remote/metadata/storage/CommittedOffsetsFile.java
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/*
* 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.kafka.server.log.remote.metadata.storage;
import org.apache.kafka.common.utils.Utils;
import org.apache.kafka.server.common.CheckpointFile;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.regex.Pattern;
/**
* This class represents a file containing the committed offsets of remote log metadata partitions.
*/
public class CommittedOffsetsFile {
private static final int CURRENT_VERSION = 0;
private static final String SEPARATOR = " ";
private static final Pattern MINIMUM_ONE_WHITESPACE = Pattern.compile("\\s+");
private final CheckpointFile<Map.Entry<Integer, Long>> checkpointFile;
CommittedOffsetsFile(File offsetsFile) throws IOException {
CheckpointFile.EntryFormatter<Map.Entry<Integer, Long>> formatter = new EntryFormatter();
checkpointFile = new CheckpointFile<>(offsetsFile, CURRENT_VERSION, formatter);
}
private static class EntryFormatter implements CheckpointFile.EntryFormatter<Map.Entry<Integer, Long>> {
@Override
public String toString(Map.Entry<Integer, Long> entry) {
// Each entry is stored in a new line as <partition-num offset>
return entry.getKey() + SEPARATOR + entry.getValue();
}
@Override
public Optional<Map.Entry<Integer, Long>> fromString(String line) {
String[] strings = MINIMUM_ONE_WHITESPACE.split(line);
if (strings.length != 2) {
return Optional.empty();
}
try {
return Optional.of(Utils.mkEntry(Integer.parseInt(strings[0]), Long.parseLong(strings[1])));
} catch (NumberFormatException e) {
return Optional.empty();
}
}
}
public synchronized void writeEntries(Map<Integer, Long> committedOffsets) throws IOException {
checkpointFile.write(committedOffsets.entrySet(), true);
}
public synchronized Map<Integer, Long> readEntries() throws IOException {
List<Map.Entry<Integer, Long>> entries = checkpointFile.read();
Map<Integer, Long> partitionToOffsets = new HashMap<>(entries.size());
for (Map.Entry<Integer, Long> entry : entries) {
Long existingValue = partitionToOffsets.put(entry.getKey(), entry.getValue());
if (existingValue != null) {
throw new IOException("Multiple entries exist for key: " + entry.getKey());
}
}
return partitionToOffsets;
}
}