116 lines
3.7 KiB
Java
116 lines
3.7 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 CleanerPooledDrop implements Drop<Buffer> {
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private static final VarHandle CLEANABLE =
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findVarHandle(lookup(), CleanerPooledDrop.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<Buffer> delegate;
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@SuppressWarnings("unused")
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private volatile GatedCleanable cleanable;
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CleanerPooledDrop(SizeClassedMemoryPool pool, MemoryManager manager,
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Drop<Buffer> 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(Buffer 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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delegate.drop(buf);
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}
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}
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@Override
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public void attach(Buffer 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 mem = manager.unwrapRecoverableMemory(buf);
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WeakReference<CleanerPooledDrop> ref = new WeakReference<>(this);
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AtomicBoolean gate = new AtomicBoolean(true);
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cleanable = new GatedCleanable(gate, CLEANER.register(this, new CleanAction(pool, mem, ref, gate)));
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}
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@Override
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public String toString() {
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return "CleanerPooledDrop(" + delegate + ')';
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}
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private static final class CleanAction implements Runnable {
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private final SizeClassedMemoryPool pool;
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private final Object mem;
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private final WeakReference<CleanerPooledDrop> ref;
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private final AtomicBoolean gate;
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private CleanAction(SizeClassedMemoryPool pool, Object mem, WeakReference<CleanerPooledDrop> ref,
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AtomicBoolean gate) {
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this.pool = pool;
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this.mem = mem;
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this.ref = ref;
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this.gate = gate;
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}
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@Override
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public void run() {
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if (gate.getAndSet(false)) {
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var monitored = ref.get();
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if (monitored == null) {
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pool.recoverMemory(mem);
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}
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}
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}
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}
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private static final 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(false);
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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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