96 lines
3.1 KiB
Java
96 lines
3.1 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 java.lang.invoke.VarHandle;
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import java.lang.ref.Cleaner.Cleanable;
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import java.lang.ref.WeakReference;
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import java.util.concurrent.atomic.AtomicBoolean;
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import static io.netty.buffer.api.Statics.CLEANER;
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import static io.netty.buffer.api.Statics.findVarHandle;
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import static java.lang.invoke.MethodHandles.lookup;
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class NativeMemoryCleanerDrop implements Drop<Buf> {
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private static final VarHandle CLEANABLE =
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findVarHandle(lookup(), NativeMemoryCleanerDrop.class, "cleanable", GatedCleanable.class);
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private final SizeClassedMemoryPool pool;
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private final MemoryManager manager;
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private final Drop<Buf> delegate;
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@SuppressWarnings("unused")
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private volatile GatedCleanable cleanable;
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NativeMemoryCleanerDrop(SizeClassedMemoryPool pool, MemoryManager manager,
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Drop<Buf> delegate) {
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this.pool = pool;
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this.manager = manager;
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this.delegate = delegate;
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}
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@Override
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public void drop(Buf buf) {
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GatedCleanable c = (GatedCleanable) CLEANABLE.getAndSet(this, null);
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if (c != null) {
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c.clean();
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}
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}
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@Override
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public void accept(Buf buf) {
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// Unregister old cleanable, if any, to avoid uncontrolled build-up.
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GatedCleanable c = (GatedCleanable) CLEANABLE.getAndSet(this, null);
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if (c != null) {
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c.disable();
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c.clean();
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}
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var pool = this.pool;
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var mem = manager.unwrapRecoverableMemory(buf);
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var delegate = this.delegate;
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WeakReference<Buf> ref = new WeakReference<>(buf);
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AtomicBoolean gate = new AtomicBoolean();
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cleanable = new GatedCleanable(gate, CLEANER.register(this, () -> {
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if (gate.compareAndSet(false, true)) {
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Buf b = ref.get();
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if (b == null) {
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pool.recoverMemory(mem);
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} else {
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delegate.drop(b);
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}
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}
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}));
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}
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private static class GatedCleanable implements Cleanable {
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private final AtomicBoolean gate;
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private final Cleanable cleanable;
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GatedCleanable(AtomicBoolean gate, Cleanable cleanable) {
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this.gate = gate;
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this.cleanable = cleanable;
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}
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public void disable() {
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gate.set(true);
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}
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@Override
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public void clean() {
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cleanable.clean();
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}
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}
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}
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