2020-10-07 11:07:34 +02:00
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/*
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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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2020-10-28 14:38:14 +01:00
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* https://www.apache.org/licenses/LICENSE-2.0
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2020-10-07 11:07:34 +02:00
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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.b2;
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import jdk.incubator.foreign.MemorySegment;
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import java.lang.ref.Cleaner;
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public interface MemoryManager {
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static MemoryManager getHeapMemoryManager() {
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return new HeapMemorySegmentManager();
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}
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static MemoryManager getNativeMemoryManager() {
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return new NativeMemorySegmentManager();
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}
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boolean isNative();
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2020-10-28 14:38:14 +01:00
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Buf allocateConfined(long size, Drop<Buf> drop, Cleaner cleaner);
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Buf allocateShared(long size, Drop<Buf> drop, Cleaner cleaner);
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2020-10-07 11:07:34 +02:00
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Drop<Buf> drop();
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Object unwrapRecoverableMemory(Buf buf);
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Buf recoverMemory(Object recoverableMemory, Drop<Buf> drop);
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abstract class MemorySegmentManager implements MemoryManager {
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@Override
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public abstract boolean isNative();
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@Override
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2020-10-28 14:38:14 +01:00
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public Buf allocateConfined(long size, Drop<Buf> drop, Cleaner cleaner) {
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2020-10-07 11:07:34 +02:00
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var segment = createSegment(size);
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2020-10-28 14:38:14 +01:00
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if (cleaner != null) {
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segment = segment.registerCleaner(cleaner);
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}
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2020-10-07 11:07:34 +02:00
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return new MemSegBuf(segment, convert(drop));
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}
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@Override
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2020-10-28 14:38:14 +01:00
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public Buf allocateShared(long size, Drop<Buf> drop, Cleaner cleaner) {
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var segment = createSegment(size).share();
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if (cleaner != null) {
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segment = segment.registerCleaner(cleaner);
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}
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2020-10-07 11:07:34 +02:00
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return new MemSegBuf(segment, convert(drop));
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}
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protected abstract MemorySegment createSegment(long size);
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@Override
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public Drop<Buf> drop() {
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return convert(MemSegBuf.SEGMENT_CLOSE);
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}
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@Override
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public Object unwrapRecoverableMemory(Buf buf) {
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var b = (MemSegBuf) buf;
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return b.seg;
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}
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@Override
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public Buf recoverMemory(Object recoverableMemory, Drop<Buf> drop) {
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var segment = (MemorySegment) recoverableMemory;
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return new MemSegBuf(segment, convert(drop));
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}
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@SuppressWarnings("unchecked")
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private static <T,R> Drop<R> convert(Drop<T> drop) {
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return (Drop<R>) drop;
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}
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}
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class HeapMemorySegmentManager extends MemorySegmentManager {
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@Override
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public boolean isNative() {
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return false;
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}
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@Override
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protected MemorySegment createSegment(long size) {
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return MemorySegment.ofArray(new byte[Math.toIntExact(size)]);
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}
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}
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class NativeMemorySegmentManager extends MemorySegmentManager {
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@Override
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public boolean isNative() {
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return true;
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}
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@Override
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protected MemorySegment createSegment(long size) {
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2020-10-28 14:38:14 +01:00
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var segment = MemorySegment.allocateNative(size);
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// .withCleanupAction(Statics.getCleanupAction(size));
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2020-10-07 11:07:34 +02:00
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Statics.MEM_USAGE_NATIVE.add(size);
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return segment;
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}
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}
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}
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