b7415a3307
Motivation: See #3411. A reusable ArrayList in InternalThreadLocalMap can avoid allocations in the following pattern: ``` List<...> list = new ArrayList<...>(); add something to list but never use InternalThreadLocalMap return list.toArray(new ...[list.size()]); ``` Modifications: Add a reusable ArrayList to InternalThreadLocalMap and update codes to use it. Result: Reuse a thread local ArrayList to avoid allocations.
62 lines
2.1 KiB
Java
62 lines
2.1 KiB
Java
/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.util.internal;
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import io.netty.util.concurrent.FastThreadLocal;
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import java.nio.charset.Charset;
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import java.nio.charset.CharsetDecoder;
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import java.nio.charset.CharsetEncoder;
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import java.util.ArrayList;
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import java.util.Map;
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import java.util.concurrent.atomic.AtomicInteger;
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/**
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* The internal data structure that stores the thread-local variables for Netty and all {@link FastThreadLocal}s.
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* Note that this class is for internal use only and is subject to change at any time. Use {@link FastThreadLocal}
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* unless you know what you are doing.
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*/
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class UnpaddedInternalThreadLocalMap {
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static ThreadLocal<InternalThreadLocalMap> slowThreadLocalMap;
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static final AtomicInteger nextIndex = new AtomicInteger();
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/** Used by {@link FastThreadLocal} */
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Object[] indexedVariables;
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// Core thread-locals
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int futureListenerStackDepth;
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int localChannelReaderStackDepth;
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Map<Class<?>, Boolean> handlerSharableCache;
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IntegerHolder counterHashCode;
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ThreadLocalRandom random;
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Map<Class<?>, TypeParameterMatcher> typeParameterMatcherGetCache;
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Map<Class<?>, Map<String, TypeParameterMatcher>> typeParameterMatcherFindCache;
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// String-related thread-locals
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StringBuilder stringBuilder;
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Map<Charset, CharsetEncoder> charsetEncoderCache;
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Map<Charset, CharsetDecoder> charsetDecoderCache;
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// ArrayList-related thread-locals
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ArrayList<Object> arrayList;
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UnpaddedInternalThreadLocalMap(Object[] indexedVariables) {
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this.indexedVariables = indexedVariables;
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}
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}
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