kafka BatchFileReader 源码
kafka BatchFileReader 代码
文件路径:/metadata/src/main/java/org/apache/kafka/metadata/util/BatchFileReader.java
/*
* 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.metadata.util;
import org.apache.kafka.common.message.LeaderChangeMessage;
import org.apache.kafka.common.message.SnapshotFooterRecord;
import org.apache.kafka.common.message.SnapshotHeaderRecord;
import org.apache.kafka.common.protocol.ByteBufferAccessor;
import org.apache.kafka.common.record.ControlRecordType;
import org.apache.kafka.common.record.FileLogInputStream.FileChannelRecordBatch;
import org.apache.kafka.common.record.FileRecords;
import org.apache.kafka.common.record.Record;
import org.apache.kafka.common.utils.Utils;
import org.apache.kafka.metadata.MetadataRecordSerde;
import org.apache.kafka.raft.Batch;
import org.apache.kafka.server.common.ApiMessageAndVersion;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.File;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Objects;
/**
* Reads a log file containing KRaft record batches.
*/
public final class BatchFileReader implements Iterator<BatchFileReader.BatchAndType>, AutoCloseable {
private static final Logger log = LoggerFactory.getLogger(BatchFileReader.class);
public static class Builder {
private String path = null;
public Builder setPath(String path) {
this.path = Objects.requireNonNull(path);
return this;
}
public BatchFileReader build() throws Exception {
if (path == null) {
throw new RuntimeException("You must specify a path.");
}
FileRecords fileRecords = FileRecords.open(new File(path), false);
try {
return new BatchFileReader(fileRecords);
} catch (Throwable e) {
Utils.closeQuietly(fileRecords, "fileRecords");
throw e;
}
}
}
public static class BatchAndType {
private final Batch<ApiMessageAndVersion> batch;
private final boolean isControl;
public BatchAndType(Batch<ApiMessageAndVersion> batch, boolean isControl) {
this.batch = batch;
this.isControl = isControl;
}
public Batch<ApiMessageAndVersion> batch() {
return batch;
}
public boolean isControl() {
return isControl;
}
}
private final FileRecords fileRecords;
private Iterator<FileChannelRecordBatch> batchIterator;
private final MetadataRecordSerde serde;
private BatchFileReader(FileRecords fileRecords) {
this.fileRecords = fileRecords;
this.batchIterator = fileRecords.batchIterator();
this.serde = new MetadataRecordSerde();
}
@Override
public boolean hasNext() {
return this.batchIterator.hasNext();
}
@Override
public BatchAndType next() {
FileChannelRecordBatch input = batchIterator.next();
if (input.isControlBatch()) {
return nextControlBatch(input);
} else {
return nextDataBatch(input);
}
}
private BatchAndType nextControlBatch(FileChannelRecordBatch input) {
List<ApiMessageAndVersion> messages = new ArrayList<>();
for (Iterator<Record> iter = input.iterator(); iter.hasNext(); ) {
Record record = iter.next();
try {
short typeId = ControlRecordType.parseTypeId(record.key());
ControlRecordType type = ControlRecordType.fromTypeId(typeId);
switch (type) {
case LEADER_CHANGE: {
LeaderChangeMessage message = new LeaderChangeMessage();
message.read(new ByteBufferAccessor(record.value()), (short) 0);
messages.add(new ApiMessageAndVersion(message, (short) 0));
break;
}
case SNAPSHOT_HEADER: {
SnapshotHeaderRecord message = new SnapshotHeaderRecord();
message.read(new ByteBufferAccessor(record.value()), (short) 0);
messages.add(new ApiMessageAndVersion(message, (short) 0));
break;
}
case SNAPSHOT_FOOTER: {
SnapshotFooterRecord message = new SnapshotFooterRecord();
message.read(new ByteBufferAccessor(record.value()), (short) 0);
messages.add(new ApiMessageAndVersion(message, (short) 0));
break;
}
default:
throw new RuntimeException("Unsupported control record type " + type + " at offset " +
record.offset());
}
} catch (Throwable e) {
throw new RuntimeException("Unable to read control record at offset " + record.offset(), e);
}
}
return new BatchAndType(Batch.data(
input.baseOffset(),
input.partitionLeaderEpoch(),
input.maxTimestamp(),
input.sizeInBytes(),
messages), true);
}
private BatchAndType nextDataBatch(FileChannelRecordBatch input) {
List<ApiMessageAndVersion> messages = new ArrayList<>();
for (Record record : input) {
try {
ByteBufferAccessor accessor = new ByteBufferAccessor(record.value());
ApiMessageAndVersion messageAndVersion = serde.read(accessor, record.valueSize());
messages.add(messageAndVersion);
} catch (Throwable e) {
throw new RuntimeException("unable to deserialize record at offset " + record.offset(), e);
}
}
return new BatchAndType(Batch.data(
input.baseOffset(),
input.partitionLeaderEpoch(),
input.maxTimestamp(),
input.sizeInBytes(),
messages), false);
}
@Override
public void close() {
try {
fileRecords.closeHandlers();
} catch (Exception e) {
log.error("Error closing fileRecords", e);
}
this.batchIterator = Collections.<FileChannelRecordBatch>emptyList().iterator();
}
}
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