103 lines
3.8 KiB
Java
103 lines
3.8 KiB
Java
/*
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* Copyright 2021 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.memseg;
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import io.netty.buffer.api.AllocationType;
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import io.netty.buffer.api.AllocatorControl;
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import io.netty.buffer.api.Buffer;
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import io.netty.buffer.api.Drop;
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import io.netty.buffer.api.MemoryManager;
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import io.netty.buffer.api.StandardAllocationTypes;
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import io.netty.buffer.api.internal.ArcDrop;
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import io.netty.buffer.api.internal.Statics;
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import jdk.incubator.foreign.MemorySegment;
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import jdk.incubator.foreign.ResourceScope;
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import java.lang.ref.Cleaner;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.function.Function;
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import static jdk.incubator.foreign.ResourceScope.newSharedScope;
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public class SegmentMemoryManagers implements MemoryManager {
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private static final ConcurrentHashMap<Long, Runnable> CLEANUP_ACTIONS = new ConcurrentHashMap<>();
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private static final Function<Long, Runnable> CLEANUP_ACTION_MAKER = s -> new ReduceNativeMemoryUsage(s);
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static Runnable getCleanupAction(long size) {
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return CLEANUP_ACTIONS.computeIfAbsent(size, CLEANUP_ACTION_MAKER);
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}
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private static MemorySegment createHeapSegment(long size) {
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return MemorySegment.ofArray(new byte[Math.toIntExact(size)]);
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}
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private static MemorySegment createNativeSegment(long size, Cleaner cleaner) {
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final ResourceScope scope = cleaner == null ? newSharedScope() : newSharedScope(cleaner);
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scope.addCloseAction(getCleanupAction(size));
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var segment = MemorySegment.allocateNative(size, scope);
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Statics.MEM_USAGE_NATIVE.add(size);
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return segment;
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}
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@Override
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public Buffer allocateShared(AllocatorControl allocatorControl, long size, Drop<Buffer> drop,
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AllocationType type) {
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if (type instanceof StandardAllocationTypes stype) {
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var segment = switch (stype) {
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case ON_HEAP -> createHeapSegment(size);
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case OFF_HEAP -> createNativeSegment(size, null);
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};
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return new MemSegBuffer(segment, segment, Statics.convert(drop), allocatorControl);
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}
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throw new IllegalArgumentException("Unknown allocation type: " + type);
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}
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@Override
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public Buffer allocateConstChild(Buffer readOnlyConstParent) {
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assert readOnlyConstParent.readOnly();
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MemSegBuffer buf = (MemSegBuffer) readOnlyConstParent;
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return new MemSegBuffer(buf);
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}
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@Override
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public Drop<Buffer> drop() {
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return Statics.convert(MemSegBuffer.SEGMENT_CLOSE);
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}
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@Override
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public Object unwrapRecoverableMemory(Buffer buf) {
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var b = (MemSegBuffer) buf;
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return b.recoverableMemory();
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}
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@Override
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public Buffer recoverMemory(AllocatorControl allocatorControl, Object recoverableMemory, Drop<Buffer> drop) {
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var segment = (MemorySegment) recoverableMemory;
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return new MemSegBuffer(segment, segment, Statics.convert(ArcDrop.acquire(drop)), allocatorControl);
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}
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@Override
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public Object sliceMemory(Object memory, int offset, int length) {
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var segment = (MemorySegment) memory;
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return segment.asSlice(offset, length);
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}
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@Override
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public String implementationName() {
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return "MemorySegment";
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}
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}
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