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.server.common;
  
  import org.apache.kafka.common.utils.BufferSupplier;
  
  import java.util.Objects;
  
  /**
   * Container for stateful instances where the lifecycle is scoped to one request.
   * When each request is handled by one thread, efficient data structures with no locking or atomic operations
   * can be used (see RequestLocal.withThreadConfinedCaching).
   */
  public class RequestLocal implements AutoCloseable {
      private static final RequestLocal NO_CACHING = new RequestLocal(BufferSupplier.NO_CACHING);
  
      private final BufferSupplier bufferSupplier;
  
      public RequestLocal(BufferSupplier bufferSupplier) {
          this.bufferSupplier = bufferSupplier;
      }
  
      public static RequestLocal noCaching() {
          return NO_CACHING;
      }
  
      /** The returned instance should be confined to a single thread. */
      public static RequestLocal withThreadConfinedCaching() {
          return new RequestLocal(BufferSupplier.create());
      }
  
      public BufferSupplier bufferSupplier() {
          return bufferSupplier;
      }
  
      @Override
      public void close() {
          bufferSupplier.close();
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) return true;
          if (o == null || getClass() != o.getClass()) return false;
          RequestLocal that = (RequestLocal) o;
          return Objects.equals(bufferSupplier, that.bufferSupplier);
      }
  
      @Override
      public int hashCode() {
          return Objects.hashCode(bufferSupplier);
      }
  
      @Override
      public String toString() {
          return "RequestLocal(bufferSupplier=" + bufferSupplier + ')';
      }
  }
  