/*
 * 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 FastThreadLocals. Note that this class is for internal use only and is subject to change at any time. Use FastThreadLocal unless you know what you are doing. /**
 * 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 FastThreadLocal /** 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;
    }
}