kafka HeaderConverter 源码
kafka HeaderConverter 代码
文件路径：/connect/api/src/main/java/org/apache/kafka/connect/storage/HeaderConverter.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.connect.storage;
import org.apache.kafka.common.Configurable;
import org.apache.kafka.common.config.ConfigDef;
import org.apache.kafka.connect.data.Schema;
import org.apache.kafka.connect.data.SchemaAndValue;
import org.apache.kafka.connect.header.Header;
import java.io.Closeable;
public interface HeaderConverter extends Configurable, Closeable {
/**
* Convert the header name and byte array value into a {@link Header} object.
* @param topic the name of the topic for the record containing the header
* @param headerKey the header's key; may not be null
* @param value the header's raw value; may be null
* @return the {@link SchemaAndValue}; may not be null
*/
SchemaAndValue toConnectHeader(String topic, String headerKey, byte[] value);
/**
* Convert the {@link Header}'s {@link Header#value() value} into its byte array representation.
* @param topic the name of the topic for the record containing the header
* @param headerKey the header's key; may not be null
* @param schema the schema for the header's value; may be null
* @param value the header's value to convert; may be null
* @return the byte array form of the Header's value; may be null if the value is null
*/
byte[] fromConnectHeader(String topic, String headerKey, Schema schema, Object value);
/**
* Configuration specification for this set of header converters.
* @return the configuration specification; may not be null
*/
ConfigDef config();
}
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