/*
* 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.transforms;
import org.apache.kafka.common.Configurable;
import org.apache.kafka.common.config.ConfigDef;
import org.apache.kafka.connect.connector.ConnectRecord;
import java.io.Closeable;
/**
* Single message transformation for Kafka Connect record types.
*
* Connectors can be configured with transformations to make lightweight message-at-a-time modifications.
*/
public interface Transformation<R extends ConnectRecord<R>> extends Configurable, Closeable {
/**
* Apply transformation to the {@code record} and return another record object (which may be {@code record} itself) or {@code null},
* corresponding to a map or filter operation respectively.
*
* The implementation must be thread-safe.
*/
R apply(R record);
/** Configuration specification for this transformation. **/
ConfigDef config();
/** Signal that this transformation instance will no longer will be used. **/
@Override
void close();
}