70 lines
2.2 KiB
Java
70 lines
2.2 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.internal;
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import io.netty.buffer.api.Drop;
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import io.netty.buffer.api.Owned;
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import io.netty.buffer.api.Resource;
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import io.netty.buffer.api.Send;
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import java.lang.invoke.VarHandle;
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import static java.lang.invoke.MethodHandles.lookup;
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public class TransferSend<I extends Resource<I>, T extends ResourceSupport<I, T>> implements Send<I> {
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private static final VarHandle RECEIVED = Statics.findVarHandle(lookup(), TransferSend.class, "received", boolean.class);
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private final Owned<T> outgoing;
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private final Drop<T> drop;
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private final Class<?> concreteType;
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@SuppressWarnings("unused")
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private volatile boolean received; // Accessed via VarHandle
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public TransferSend(Owned<T> outgoing, Drop<T> drop, Class<?> concreteType) {
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this.outgoing = outgoing;
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this.drop = drop;
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this.concreteType = concreteType;
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}
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@SuppressWarnings("unchecked")
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@Override
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public I receive() {
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gateReception();
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var copy = outgoing.transferOwnership(drop);
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drop.attach(copy);
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return (I) copy;
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}
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private void gateReception() {
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if ((boolean) RECEIVED.getAndSet(this, true)) {
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throw new IllegalStateException("This object has already been received.");
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}
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}
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@Override
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public boolean referentIsInstanceOf(Class<?> cls) {
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return cls.isAssignableFrom(concreteType);
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}
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@Override
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public void discard() {
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if (!(boolean) RECEIVED.getAndSet(this, true)) {
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var copy = outgoing.transferOwnership(drop);
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drop.attach(copy);
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copy.close();
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}
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}
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}
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