68 lines
2.3 KiB
Java
68 lines
2.3 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.memseg;
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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 NativeMemorySegmentManager extends AbstractMemorySegmentManager {
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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 final class ReduceNativeMemoryUsage implements Runnable {
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private final long size;
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private ReduceNativeMemoryUsage(long size) {
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this.size = size;
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}
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@Override
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public void run() {
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Statics.MEM_USAGE_NATIVE.add(-size);
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}
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@Override
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public String toString() {
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return "ReduceNativeMemoryUsage(by " + size + " bytes)";
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}
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}
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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, 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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}
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