kafka ByteBufferSerializer 源码
kafka ByteBufferSerializer 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/serialization/ByteBufferSerializer.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.serialization;
import org.apache.kafka.common.utils.Utils;
import java.nio.ByteBuffer;
/**
* Do not need to flip before call <i>serialize(String, ByteBuffer)</i>. For example:
*
* <blockquote>
* <pre>
* ByteBufferSerializer serializer = ...; // Create Serializer
* ByteBuffer buffer = ...; // Allocate ByteBuffer
* buffer.put(data); // Put data into buffer, do not need to flip
* serializer.serialize(topic, buffer); // Serialize buffer
* </pre>
* </blockquote>
*/
public class ByteBufferSerializer implements Serializer<ByteBuffer> {
@Override
public byte[] serialize(String topic, ByteBuffer data) {
if (data == null) {
return null;
}
if (data.hasArray()) {
final byte[] arr = data.array();
if (data.arrayOffset() == 0 && arr.length == data.remaining()) {
return arr;
}
}
data.flip();
return Utils.toArray(data);
}
}
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