82 lines
2.8 KiB
Java
82 lines
2.8 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.memseg;
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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 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 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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public abstract class AbstractMemorySegmentManager implements MemoryManager {
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@Override
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public Buffer allocateShared(AllocatorControl allocatorControl, long size, Drop<Buffer> drop, Cleaner cleaner) {
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var segment = createSegment(size, cleaner);
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return new MemSegBuffer(segment, segment, Statics.convert(drop), allocatorControl);
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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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protected abstract MemorySegment createSegment(long size, Cleaner cleaner);
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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 int capacityOfRecoverableMemory(Object memory) {
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return (int) ((MemorySegment) memory).byteSize();
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}
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@Override
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public void discardRecoverableMemory(Object recoverableMemory) {
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var segment = (MemorySegment) recoverableMemory;
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ResourceScope scope = segment.scope();
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if (!scope.isImplicit()) {
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scope.close();
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}
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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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}
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