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.clients.consumer.internals;
  
  import java.util.function.Supplier;
  
  /**
   * Simple {@link Supplier} that caches the initial creation of the object and stores it for later calls
   * to {@link #get()}.
   *
   * <p/>
   *
   * <em>Note</em>: this class is not thread safe! Use only in contexts which are designed/guaranteed to be
   * single-threaded.
   */
  public abstract class CachedSupplier<T> implements Supplier<T> {
  
      private T result;
  
      protected abstract T create();
  
      @Override
      public T get() {
          if (result == null)
              result = create();
  
          return result;
      }
  }
  