kafka RecordVersion 源码
kafka RecordVersion 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/record/RecordVersion.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.common.record;
/**
* Defines the record format versions supported by Kafka.
*
* For historical reasons, the record format version is also known as `magic` and `message format version`. Note that
* the version actually applies to the {@link RecordBatch} (instead of the {@link Record}). Finally, the
* `message.format.version` topic config confusingly expects an ApiVersion instead of a RecordVersion.
*/
public enum RecordVersion {
V0(0), V1(1), V2(2);
private static final RecordVersion[] VALUES = values();
public final byte value;
RecordVersion(int value) {
this.value = (byte) value;
}
/**
* Check whether this version precedes another version.
*
* @return true only if the magic value is less than the other's
*/
public boolean precedes(RecordVersion other) {
return this.value < other.value;
}
public static RecordVersion lookup(byte value) {
if (value < 0 || value >= VALUES.length)
throw new IllegalArgumentException("Unknown record version: " + value);
return VALUES[value];
}
public static RecordVersion current() {
return V2;
}
}
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