AdaptivePoolingAllocator.java — netty Source File

Source Code

/*
 * Copyright 2022 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.buffer;

import io.netty.util.ByteProcessor;
import io.netty.util.CharsetUtil;
import io.netty.util.IllegalReferenceCountException;
import io.netty.util.NettyRuntime;
import io.netty.util.Recycler;
import io.netty.util.Recycler.EnhancedHandle;
import io.netty.util.concurrent.ConcurrentSkipListIntObjMultimap;
import io.netty.util.concurrent.ConcurrentSkipListIntObjMultimap.IntEntry;
import io.netty.util.concurrent.FastThreadLocal;
import io.netty.util.concurrent.FastThreadLocalThread;
import io.netty.util.concurrent.MpscIntQueue;
import io.netty.util.internal.MathUtil;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.PlatformDependent;
import io.netty.util.internal.RefCnt;
import io.netty.util.internal.SystemPropertyUtil;
import io.netty.util.internal.ThreadExecutorMap;
import io.netty.util.internal.UnstableApi;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.FileChannel;
import java.nio.channels.GatheringByteChannel;
import java.nio.channels.ScatteringByteChannel;
import java.nio.charset.Charset;
import java.util.Arrays;
import java.util.Iterator;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
import java.util.concurrent.atomic.LongAdder;
import java.util.concurrent.locks.StampedLock;
import java.util.function.IntConsumer;

/**
 * An auto-tuning pooling allocator, that follows an anti-generational hypothesis.
 * <p>
 * The allocator is organized into a list of Magazines, and each magazine has a chunk-buffer that they allocate buffers
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