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.cassandra.utils.concurrent;
  
  import java.util.ArrayDeque;
  
  import io.netty.util.concurrent.FastThreadLocal;
  
  public final class ThreadLocals
  {
      private ThreadLocals()
      {
      }
  
      public static <T> LightweightRecycler<T> createLightweightRecycler(int limit)
      {
          return new FastThreadLocalLightweightRecycler<>(limit);
      }
  
      /**
       * A {@link LightweightRecycler} which is backed by a {@link FastThreadLocal}.
       */
      private static final class FastThreadLocalLightweightRecycler<T> extends FastThreadLocal<ArrayDeque<T>> implements LightweightRecycler<T>
      {
          private final int capacity;
  
          public FastThreadLocalLightweightRecycler(int capacity)
          {
              super();
              this.capacity = capacity;
          }
  
          protected ArrayDeque<T> initialValue()
          {
              return new ArrayDeque<>(capacity);
          }
  
          /**
           * @return maximum capacity of the recycler
           */
          public int capacity()
          {
              return capacity;
          }
      }
  }
  