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   /*
    * Copyright 2014 The Netty Project
    *
    * The Netty Project 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 io.netty.util.internal;
  
  import io.netty.util.concurrent.FastThreadLocal;
  
  import java.nio.charset.Charset;
  import java.nio.charset.CharsetDecoder;
  import java.nio.charset.CharsetEncoder;
  import java.util.ArrayList;
  import java.util.Map;
  import java.util.concurrent.atomic.AtomicInteger;
  
  /**
   * The internal data structure that stores the thread-local variables for Netty and all {@link FastThreadLocal}s.
   * Note that this class is for internal use only and is subject to change at any time.  Use {@link FastThreadLocal}
   * unless you know what you are doing.
   */
  class UnpaddedInternalThreadLocalMap {
  
      static final ThreadLocal<InternalThreadLocalMap> slowThreadLocalMap = new ThreadLocal<InternalThreadLocalMap>();
      static final AtomicInteger nextIndex = new AtomicInteger();
  
      /** Used by {@link FastThreadLocal} */
      Object[] indexedVariables;
  
      // Core thread-locals
      int futureListenerStackDepth;
      int localChannelReaderStackDepth;
      Map<Class<?>, Boolean> handlerSharableCache;
      IntegerHolder counterHashCode;
      ThreadLocalRandom random;
      Map<Class<?>, TypeParameterMatcher> typeParameterMatcherGetCache;
      Map<Class<?>, Map<String, TypeParameterMatcher>> typeParameterMatcherFindCache;
  
      // String-related thread-locals
      StringBuilder stringBuilder;
      Map<Charset, CharsetEncoder> charsetEncoderCache;
      Map<Charset, CharsetDecoder> charsetDecoderCache;
  
      // ArrayList-related thread-locals
      ArrayList<Object> arrayList;
  
      UnpaddedInternalThreadLocalMap(Object[] indexedVariables) {
          this.indexedVariables = indexedVariables;
      }
  }