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/*
* 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.streams.kstream;
import org.apache.kafka.common.serialization.Serde;
/**
* The class that is used to capture the key and value {@link Serde}s and set the part of name used for
* repartition topics when performing {@link KStream#groupBy(KeyValueMapper, Grouped)}, {@link
* KStream#groupByKey(Grouped)}, or {@link KTable#groupBy(KeyValueMapper, Grouped)} operations. Note
* that Kafka Streams does not always create repartition topics for grouping operations.
*
* @param the key type
* @param the value type
*/
public class Grouped implements NamedOperation> {
protected final Serde keySerde;
protected final Serde valueSerde;
protected final String name;
private Grouped(final String name,
final Serde keySerde,
final Serde valueSerde) {
this.name = name;
this.keySerde = keySerde;
this.valueSerde = valueSerde;
}
protected Grouped(final Grouped grouped) {
this(grouped.name, grouped.keySerde, grouped.valueSerde);
}
/**
* Create a {@link Grouped} instance with the provided name used as part of the repartition topic if required.
*
* @param name the name used for a repartition topic if required
* @return a new {@link Grouped} configured with the name
* @see KStream#groupByKey(Grouped)
* @see KStream#groupBy(KeyValueMapper, Grouped)
* @see KTable#groupBy(KeyValueMapper, Grouped)
*/
public static Grouped as(final String name) {
return new Grouped<>(name, null, null);
}
/**
* Create a {@link Grouped} instance with the provided keySerde. If {@code null} the default key serde from config will be used.
*
* @param keySerde the Serde used for serializing the key. If {@code null} the default key serde from config will be used
* @return a new {@link Grouped} configured with the keySerde
* @see KStream#groupByKey(Grouped)
* @see KStream#groupBy(KeyValueMapper, Grouped)
* @see KTable#groupBy(KeyValueMapper, Grouped)
*/
public static Grouped keySerde(final Serde keySerde) {
return new Grouped<>(null, keySerde, null);
}
/**
* Create a {@link Grouped} instance with the provided valueSerde. If {@code null} the default value serde from config will be used.
*
* @param valueSerde the {@link Serde} used for serializing the value. If {@code null} the default value serde from config will be used
* @return a new {@link Grouped} configured with the valueSerde
* @see KStream#groupByKey(Grouped)
* @see KStream#groupBy(KeyValueMapper, Grouped)
* @see KTable#groupBy(KeyValueMapper, Grouped)
*/
public static Grouped valueSerde(final Serde valueSerde) {
return new Grouped<>(null, null, valueSerde);
}
/**
* Create a {@link Grouped} instance with the provided name, keySerde, and valueSerde. If the keySerde and/or the valueSerde is
* {@code null} the default value for the respective serde from config will be used.
*
* @param name the name used as part of the repartition topic name if required
* @param keySerde the {@link Serde} used for serializing the key. If {@code null} the default key serde from config will be used
* @param valueSerde the {@link Serde} used for serializing the value. If {@code null} the default value serde from config will be used
* @return a new {@link Grouped} configured with the name, keySerde, and valueSerde
* @see KStream#groupByKey(Grouped)
* @see KStream#groupBy(KeyValueMapper, Grouped)
* @see KTable#groupBy(KeyValueMapper, Grouped)
*/
public static Grouped with(final String name,
final Serde keySerde,
final Serde valueSerde) {
return new Grouped<>(name, keySerde, valueSerde);
}
/**
* Create a {@link Grouped} instance with the provided keySerde and valueSerde. If the keySerde and/or the valueSerde is
* {@code null} the default value for the respective serde from config will be used.
*
* @param keySerde the {@link Serde} used for serializing the key. If {@code null} the default key serde from config will be used
* @param valueSerde the {@link Serde} used for serializing the value. If {@code null} the default value serde from config will be used
* @return a new {@link Grouped} configured with the keySerde, and valueSerde
* @see KStream#groupByKey(Grouped)
* @see KStream#groupBy(KeyValueMapper, Grouped)
* @see KTable#groupBy(KeyValueMapper, Grouped)
*/
public static Grouped with(final Serde keySerde,
final Serde valueSerde) {
return new Grouped<>(null, keySerde, valueSerde);
}
/**
* Perform the grouping operation with the name for a repartition topic if required. Note
* that Kafka Streams does not always create repartition topics for grouping operations.
*
* @param name the name used for the processor name and as part of the repartition topic name if required
* @return a new {@link Grouped} instance configured with the name
* */
@Override
public Grouped withName(final String name) {
return new Grouped<>(name, keySerde, valueSerde);
}
/**
* Perform the grouping operation using the provided keySerde for serializing the key.
*
* @param keySerde {@link Serde} to use for serializing the key. If {@code null} the default key serde from config will be used
* @return a new {@link Grouped} instance configured with the keySerde
*/
public Grouped withKeySerde(final Serde keySerde) {
return new Grouped<>(name, keySerde, valueSerde);
}
/**
* Perform the grouping operation using the provided valueSerde for serializing the value.
*
* @param valueSerde {@link Serde} to use for serializing the value. If {@code null} the default value serde from config will be used
* @return a new {@link Grouped} instance configured with the valueSerde
*/
public Grouped withValueSerde(final Serde valueSerde) {
return new Grouped<>(name, keySerde, valueSerde);
}
}
