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enforces reassembly on the receiver side
Signed-off-by: Oleh Dokuka <shadowgun@i.ua>
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rsocket-core/src/main/java/io/rsocket/fragmentation/ReassemblyDuplexConnection.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| /* | ||
| * Copyright 2015-2018 the original author or authors. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| package io.rsocket.fragmentation; | ||
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| import io.netty.buffer.ByteBuf; | ||
| import io.netty.buffer.ByteBufAllocator; | ||
| import io.rsocket.DuplexConnection; | ||
| import io.rsocket.frame.FrameLengthFlyweight; | ||
| import java.util.Objects; | ||
| import org.reactivestreams.Publisher; | ||
| import reactor.core.publisher.Flux; | ||
| import reactor.core.publisher.Mono; | ||
|
|
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| /** | ||
| * A {@link DuplexConnection} implementation that reassembles {@link ByteBuf}s. | ||
| * | ||
| * @see <a | ||
| * href="https://github.com/rsocket/rsocket/blob/master/Protocol.md#fragmentation-and-reassembly">Fragmentation | ||
| * and Reassembly</a> | ||
| */ | ||
| public final class ReassemblyDuplexConnection implements DuplexConnection { | ||
| private final DuplexConnection delegate; | ||
| private final FrameReassembler frameReassembler; | ||
| private final boolean decodeLength; | ||
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| public ReassemblyDuplexConnection( | ||
| DuplexConnection delegate, ByteBufAllocator allocator, boolean decodeLength) { | ||
| Objects.requireNonNull(delegate, "delegate must not be null"); | ||
| Objects.requireNonNull(allocator, "byteBufAllocator must not be null"); | ||
| this.decodeLength = decodeLength; | ||
| this.delegate = delegate; | ||
| this.frameReassembler = new FrameReassembler(allocator); | ||
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| delegate.onClose().doFinally(s -> frameReassembler.dispose()).subscribe(); | ||
| } | ||
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| @Override | ||
| public Mono<Void> send(Publisher<ByteBuf> frames) { | ||
| return delegate.send(frames); | ||
| } | ||
|
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| @Override | ||
| public Mono<Void> sendOne(ByteBuf frame) { | ||
| return delegate.sendOne(frame); | ||
| } | ||
|
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| private ByteBuf decode(ByteBuf frame) { | ||
| if (decodeLength) { | ||
| return FrameLengthFlyweight.frame(frame).retain(); | ||
| } else { | ||
| return frame; | ||
| } | ||
| } | ||
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| @Override | ||
| public Flux<ByteBuf> receive() { | ||
| return delegate | ||
| .receive() | ||
| .handle( | ||
| (byteBuf, sink) -> { | ||
| ByteBuf decode = decode(byteBuf); | ||
| frameReassembler.reassembleFrame(decode, sink); | ||
| }); | ||
| } | ||
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| @Override | ||
| public Mono<Void> onClose() { | ||
| return delegate.onClose(); | ||
| } | ||
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| @Override | ||
| public void dispose() { | ||
| delegate.dispose(); | ||
| } | ||
| } |
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