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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 java.util.Objects;
import java.util.function.Consumer;
import java.util.function.Function;
/**
* The {@code Branched} class is used to define the optional parameters when building branches with
* {@link BranchedKStream}.
*
* @param type of record key
* @param type of record value
*/
public class Branched implements NamedOperation> {
protected final String name;
protected final Function, ? extends KStream> chainFunction;
protected final Consumer> chainConsumer;
protected Branched(final String name,
final Function, ? extends KStream> chainFunction,
final Consumer> chainConsumer) {
this.name = name;
this.chainFunction = chainFunction;
this.chainConsumer = chainConsumer;
}
protected Branched(final Branched branched) {
this(branched.name, branched.chainFunction, branched.chainConsumer);
}
/**
* Create an instance of {@code Branched} with provided branch name suffix.
*
* @param name
* the branch name suffix to be used (see {@link BranchedKStream} description for details)
*
* @param key type
* @param value type
*
* @return a new instance of {@code Branched}
*/
public static Branched as(final String name) {
Objects.requireNonNull(name, "name cannot be null");
return new Branched<>(name, null, null);
}
/**
* Create an instance of {@code Branched} with provided chain function.
*
* @param chain
* A function that will be applied to the branch. If the provided function returns
* {@code null}, its result is ignored, otherwise it is added to the {@code Map} returned
* by {@link BranchedKStream#defaultBranch()} or {@link BranchedKStream#noDefaultBranch()} (see
* {@link BranchedKStream} description for details).
*
* @param key type
* @param value type
*
* @return a new instance of {@code Branched}
*/
public static Branched withFunction(
final Function, ? extends KStream> chain
) {
Objects.requireNonNull(chain, "chain function cannot be null");
return new Branched<>(null, chain, null);
}
/**
* Create an instance of {@code Branched} with provided chain consumer.
*
* @param chain
* A consumer to which the branch will be sent. If a consumer is provided,
* the respective branch will not be added to the resulting {@code Map} returned
* by {@link BranchedKStream#defaultBranch()} or {@link BranchedKStream#noDefaultBranch()} (see
* {@link BranchedKStream} description for details).
*
* @param key type
* @param value type
*
* @return a new instance of {@code Branched}
*/
public static Branched withConsumer(final Consumer> chain) {
Objects.requireNonNull(chain, "chain consumer cannot be null");
return new Branched<>(null, null, chain);
}
/**
* Create an instance of {@code Branched} with provided chain function and branch name suffix.
*
* @param chain
* A function that will be applied to the branch. If the provided function returns
* {@code null}, its result is ignored, otherwise it is added to the {@code Map} returned
* by {@link BranchedKStream#defaultBranch()} or {@link BranchedKStream#noDefaultBranch()} (see
* {@link BranchedKStream} description for details).
* @param name
* the branch name suffix to be used. If {@code null}, a default branch name suffix will be generated
* (see {@link BranchedKStream} description for details)
*
* @param key type
* @param value type
*
* @return a new instance of {@code Branched}
*/
public static Branched withFunction(
final Function, ? extends KStream> chain,
final String name
) {
Objects.requireNonNull(chain, "chain function cannot be null");
return new Branched<>(name, chain, null);
}
/**
* Create an instance of {@code Branched} with provided chain consumer and branch name suffix.
*
* @param chain
* A consumer to which the branch will be sent. If a non-null consumer is provided,
* the respective branch will not be added to the resulting {@code Map} returned
* by {@link BranchedKStream#defaultBranch()} or {@link BranchedKStream#noDefaultBranch()} (see
* {@link BranchedKStream} description for details).
* @param name
* the branch name suffix to be used. If {@code null}, a default branch name suffix will be generated
* (see {@link BranchedKStream} description for details)
*
* @param key type
* @param value type
*
* @return a new instance of {@code Branched}
*/
public static Branched withConsumer(final Consumer> chain,
final String name) {
Objects.requireNonNull(chain, "chain consumer cannot be null");
return new Branched<>(name, null, chain);
}
/**
* Configure the instance of {@code Branched} with a branch name suffix.
*
* @param name
* the branch name suffix to be used. If {@code null} a default branch name suffix will be generated (see
* {@link BranchedKStream} description for details)
*
* @return {@code this} to facilitate method chaining
*/
@Override
public Branched withName(final String name) {
Objects.requireNonNull(name, "name cannot be null");
return new Branched<>(name, chainFunction, chainConsumer);
}
}
