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/*
 * Copyright 2024 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.buffer.AdaptivePoolingAllocator.MagazineCaching;
import io.netty.util.internal.PlatformDependent;
import io.netty.util.internal.SystemPropertyUtil;
import io.netty.util.internal.UnstableApi;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;

import static io.netty.util.internal.PlatformDependent.javaVersion;

/**
 * An auto-tuning pooling {@link ByteBufAllocator}, that follows an anti-generational hypothesis.
 * 

* Note: this allocator is experimental. It is recommended to roll out usage slowly, * and to carefully monitor application performance in the process. *

* See the {@link AdaptivePoolingAllocator} class documentation for implementation details. */ @UnstableApi public final class AdaptiveByteBufAllocator extends AbstractByteBufAllocator implements ByteBufAllocatorMetricProvider, ByteBufAllocatorMetric { private static final InternalLogger logger = InternalLoggerFactory.getInstance(AdaptiveByteBufAllocator.class); private static final boolean DEFAULT_USE_CACHED_MAGAZINES_FOR_NON_EVENT_LOOP_THREADS; static { DEFAULT_USE_CACHED_MAGAZINES_FOR_NON_EVENT_LOOP_THREADS = SystemPropertyUtil.getBoolean( "io.netty.allocator.useCachedMagazinesForNonEventLoopThreads", false); logger.debug("-Dio.netty.allocator.useCachedMagazinesForNonEventLoopThreads: {}", DEFAULT_USE_CACHED_MAGAZINES_FOR_NON_EVENT_LOOP_THREADS); } private final AdaptiveAllocatorApi direct; private final AdaptiveAllocatorApi heap; public AdaptiveByteBufAllocator() { this(PlatformDependent.directBufferPreferred()); } public AdaptiveByteBufAllocator(boolean preferDirect) { this(preferDirect, DEFAULT_USE_CACHED_MAGAZINES_FOR_NON_EVENT_LOOP_THREADS); } public AdaptiveByteBufAllocator(boolean preferDirect, boolean useCacheForNonEventLoopThreads) { super(preferDirect); if (javaVersion() < 8) { // The implementation uses StampedLock, which was introduced in Java 8. throw new IllegalStateException("This allocator require Java 8 or newer."); } MagazineCaching magazineCaching = useCacheForNonEventLoopThreads? MagazineCaching.FastThreadLocalThreads : MagazineCaching.EventLoopThreads; direct = new AdaptivePoolingAllocator(new DirectChunkAllocator(this), magazineCaching); heap = new AdaptivePoolingAllocator(new HeapChunkAllocator(this), magazineCaching); } @Override protected ByteBuf newHeapBuffer(int initialCapacity, int maxCapacity) { return heap.allocate(initialCapacity, maxCapacity); } @Override protected ByteBuf newDirectBuffer(int initialCapacity, int maxCapacity) { return direct.allocate(initialCapacity, maxCapacity); } @Override public boolean isDirectBufferPooled() { return true; } @Override public long usedHeapMemory() { return heap.usedMemory(); } @Override public long usedDirectMemory() { return direct.usedMemory(); } @Override public ByteBufAllocatorMetric metric() { return this; } interface AdaptiveAllocatorApi { ByteBuf allocate(int initialCapacity, int maxCapacity); long usedMemory(); } private static final class HeapChunkAllocator implements AdaptivePoolingAllocator.ChunkAllocator { private final ByteBufAllocator allocator; private HeapChunkAllocator(ByteBufAllocator allocator) { this.allocator = allocator; } @Override public AbstractByteBuf allocate(int initialCapacity, int maxCapacity) { return PlatformDependent.hasUnsafe() ? new UnpooledUnsafeHeapByteBuf(allocator, initialCapacity, maxCapacity) : new UnpooledHeapByteBuf(allocator, initialCapacity, maxCapacity); } } private static final class DirectChunkAllocator implements AdaptivePoolingAllocator.ChunkAllocator { private final ByteBufAllocator allocator; private DirectChunkAllocator(ByteBufAllocator allocator) { this.allocator = allocator; } @Override public AbstractByteBuf allocate(int initialCapacity, int maxCapacity) { return PlatformDependent.hasUnsafe() ? UnsafeByteBufUtil.newUnsafeDirectByteBuf(allocator, initialCapacity, maxCapacity) : new UnpooledDirectByteBuf(allocator, initialCapacity, maxCapacity); } } }





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