12b38234e5
This allows the pooling allocator to precisely control how each allocation should be dropped. This is important to the pooling allocator, because it needs to know what arena, chunk, page, run, etc. is being freed, exactly.
163 lines
5.3 KiB
Java
163 lines
5.3 KiB
Java
/*
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* Copyright 2020 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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* https://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.buffer.api;
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import io.netty.buffer.api.internal.Statics;
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import java.lang.invoke.VarHandle;
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import java.nio.ByteOrder;
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import java.util.ArrayList;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentLinkedQueue;
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import java.util.function.Supplier;
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import static io.netty.buffer.api.internal.Statics.NO_OP_DROP;
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import static java.lang.invoke.MethodHandles.lookup;
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class SizeClassedMemoryPool implements BufferAllocator, AllocatorControl, Drop<Buffer> {
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private static final VarHandle CLOSE = Statics.findVarHandle(
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lookup(), SizeClassedMemoryPool.class, "closed", boolean.class);
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private final MemoryManager manager;
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private final ConcurrentHashMap<Integer, ConcurrentLinkedQueue<Object>> pool;
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@SuppressWarnings("unused")
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private volatile boolean closed;
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protected SizeClassedMemoryPool(MemoryManager manager) {
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this.manager = manager;
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pool = new ConcurrentHashMap<>();
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}
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@Override
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public Buffer allocate(int size) {
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BufferAllocator.checkSize(size);
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var sizeClassPool = getSizeClassPool(size);
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Object memory = sizeClassPool.poll();
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if (memory != null) {
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return recoverMemoryIntoBuffer(memory)
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.fill((byte) 0)
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.order(ByteOrder.nativeOrder());
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}
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return createBuf(size, getDrop());
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}
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@Override
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public Supplier<Buffer> constBufferSupplier(byte[] bytes) {
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Buffer constantBuffer = manager.allocateShared(this, bytes.length, manager.drop(), Statics.CLEANER);
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constantBuffer.writeBytes(bytes).makeReadOnly();
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return () -> manager.allocateConstChild(constantBuffer);
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}
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protected MemoryManager getMemoryManager() {
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return manager;
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}
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protected Buffer createBuf(int size, Drop<Buffer> drop) {
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var buf = manager.allocateShared(this, size, drop, null);
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drop.attach(buf);
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return buf;
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}
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protected Drop<Buffer> getDrop() {
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return new CleanerPooledDrop(this, getMemoryManager(), this);
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}
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@Override
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public void close() {
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if (CLOSE.compareAndSet(this, false, true)) {
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var capturedExceptions = new ArrayList<Exception>(4);
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pool.forEach((k, v) -> {
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Object memory;
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while ((memory = v.poll()) != null) {
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try {
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manager.discardRecoverableMemory(memory);
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} catch (Exception e) {
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capturedExceptions.add(e);
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}
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}
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});
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if (!capturedExceptions.isEmpty()) {
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var exception = new ResourceDisposeFailedException();
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capturedExceptions.forEach(exception::addSuppressed);
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throw exception;
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}
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}
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}
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@Override
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public void drop(Buffer buf) {
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if (closed) {
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manager.drop().drop(buf);
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return;
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}
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Object mem = manager.unwrapRecoverableMemory(buf);
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var sizeClassPool = getSizeClassPool(manager.capacityOfRecoverableMemory(mem));
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sizeClassPool.offer(mem);
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if (closed) {
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Object memory;
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while ((memory = sizeClassPool.poll()) != null) {
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manager.discardRecoverableMemory(memory);
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}
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}
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}
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@Override
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public String toString() {
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return "SizeClassedMemoryPool";
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}
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@SuppressWarnings("unchecked")
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@Override
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public UntetheredMemory allocateUntethered(Buffer originator, int size) {
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var sizeClassPool = getSizeClassPool(size);
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Object candidateMemory = sizeClassPool.poll();
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if (candidateMemory == null) {
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Buffer untetheredBuf = createBuf(size, NO_OP_DROP);
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candidateMemory = manager.unwrapRecoverableMemory(untetheredBuf);
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}
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Object memory = candidateMemory;
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return new UntetheredMemory() {
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@Override
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public <Memory> Memory memory() {
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return (Memory) memory;
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}
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@Override
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public <BufferType extends Buffer> Drop<BufferType> drop() {
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return (Drop<BufferType>) getDrop();
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}
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};
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}
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@Override
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public void recoverMemory(Object memory) {
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Buffer buf = recoverMemoryIntoBuffer(memory);
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buf.close();
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}
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private Buffer recoverMemoryIntoBuffer(Object memory) {
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var drop = getDrop();
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var buf = manager.recoverMemory(this, memory, drop);
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drop.attach(buf);
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return buf;
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}
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private ConcurrentLinkedQueue<Object> getSizeClassPool(int size) {
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return pool.computeIfAbsent(size, k -> new ConcurrentLinkedQueue<>());
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}
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}
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