content: /*
   * 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.streams.processor.ConnectedStoreProvider;
  
  import java.util.function.Supplier;
  
  /**
   * A {@code TransformerSupplier} interface which can create one or more {@link Transformer} instances.
   * <p>
   * The supplier should always generate a new instance each time {@link TransformerSupplier#get()} gets called. Creating
   * a single {@link Transformer} object and returning the same object reference in {@link TransformerSupplier#get()} would be
   * a violation of the supplier pattern and leads to runtime exceptions.
   *
   * @param <K> key type
   * @param <V> value type
   * @param <R> {@link org.apache.kafka.streams.KeyValue KeyValue} return type (both key and value type can be set
   *            arbitrarily)
   * @see Transformer
   * @see ValueTransformer
   * @see ValueTransformerSupplier
   * @deprecated Since 4.0. Use {@link org.apache.kafka.streams.processor.api.ProcessorSupplier api.ProcessorSupplier} instead.
   */
  @Deprecated
  @FunctionalInterface
  public interface TransformerSupplier<K, V, R> extends ConnectedStoreProvider, Supplier<Transformer<K, V, R>> {
  
      /**
       * Return a newly constructed {@link Transformer} instance.
       * The supplier should always generate a new instance each time {@link TransformerSupplier#get() gets called}.
       * <p>
       * Creating a single {@link Transformer} object and returning the same object reference in {@link TransformerSupplier#get()}
       * is a violation of the supplier pattern and leads to runtime exceptions.
       *
       * @return a newly constructed {@link Transformer} instance
       */
      Transformer<K, V, R> get();
  }
  