InternalThreadLocalMap.java — netty Source File

Source Code

/*
 * 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:
 *
 *   https://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 io.netty.util.concurrent.FastThreadLocalThread;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;

import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CharsetEncoder;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.BitSet;
import java.util.IdentityHashMap;
import java.util.Map;
import java.util.Set;
import java.util.WeakHashMap;
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.
 */
public final class InternalThreadLocalMap extends UnpaddedInternalThreadLocalMap {
    private static final ThreadLocal<InternalThreadLocalMap> slowThreadLocalMap =
            new ThreadLocal<InternalThreadLocalMap>();
    private static final AtomicInteger nextIndex = new AtomicInteger();
    // Internal use only.
    public static final int VARIABLES_TO_REMOVE_INDEX = nextVariableIndex();

    private static final int DEFAULT_ARRAY_LIST_INITIAL_CAPACITY = 8;
    private static final int ARRAY_LIST_CAPACITY_EXPAND_THRESHOLD = 1 << 30;
    // Reference: https://hg.openjdk.java.net/jdk8/jdk8/jdk/file/tip/src/share/classes/java/util/ArrayList.java#l229
    private static final int ARRAY_LIST_CAPACITY_MAX_SIZE = Integer.MAX_VALUE - 8;

    private static final int HANDLER_SHARABLE_CACHE_INITIAL_CAPACITY = 4;
    private static final int INDEXED_VARIABLE_TABLE_INITIAL_SIZE = 32;

    private static final int STRING_BUILDER_INITIAL_SIZE;
    private static final int STRING_BUILDER_MAX_SIZE;

    private static final InternalLogger logger;
    /** Internal use only. */
// ... (334 more lines)