55 lines
1.8 KiB
Java
55 lines
1.8 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;
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import java.lang.invoke.VarHandle;
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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 TransferSend<I extends Rc<I>, T extends Rc<I>> implements Send<I> {
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private static final VarHandle RECEIVED = 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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@SuppressWarnings("unused")
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private volatile boolean received; // Accessed via VarHandle
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TransferSend(Owned<T> outgoing, Drop<T> drop) {
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this.outgoing = outgoing;
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this.drop = drop;
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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.accept(copy);
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return (I) copy;
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}
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Owned<T> unsafeUnwrapOwned() {
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gateReception();
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return outgoing;
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}
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private void gateReception() {
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if (!RECEIVED.compareAndSet(this, false, 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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}
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