/* * 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.annotation.InterfaceStability; /** * The {@code ForeachAction} interface for performing an action on a {@link org.apache.kafka.streams.KeyValue key-value * pair}. * This is a stateless record-by-record operation, i.e, {@link #apply(Object, Object)} is invoked individually for each * record of a stream. * If stateful processing is required, consider using * {@link KStream#process(org.apache.kafka.streams.processor.ProcessorSupplier, String...) KStream#process(...)}. * * @param <K> key type * @param <V> value type * @see KStream#foreach(ForeachAction) * @see KTable#foreach(ForeachAction) */ @InterfaceStability.Unstable public interface ForeachAction<K, V> { /** * Perform an action for each record of a stream. * * @param key the key of the record * @param value the value of the record */ void apply(final K key, final V value); }