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DefaultChannelPipeline.java
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DefaultChannelPipeline.java
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/*
* Copyright (c) 2016—2017 Andrei Tomashpolskiy and individual contributors.
*
* 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 bt.net.pipeline;
import bt.net.Peer;
import bt.net.buffer.BorrowedBuffer;
import bt.net.buffer.BufferMutator;
import bt.protocol.Message;
import bt.protocol.handler.MessageHandler;
import java.nio.ByteBuffer;
import java.util.List;
import java.util.Queue;
import java.util.concurrent.LinkedBlockingQueue;
public class DefaultChannelPipeline implements ChannelPipeline {
private final MessageDeserializer deserializer;
private final MessageSerializer serializer;
private final BorrowedBuffer<ByteBuffer> inboundBuffer;
private final BorrowedBuffer<ByteBuffer> outboundBuffer;
private final List<BufferMutator> decoders;
private final List<BufferMutator> encoders;
private final Queue<Message> inboundQueue;
// inbound buffer parameters
private int decodedDataOffset;
private int undecodedDataOffset;
private DefaultChannelHandlerContext context;
public DefaultChannelPipeline(
Peer peer,
MessageHandler<Message> protocol,
BorrowedBuffer<ByteBuffer> inboundBuffer,
BorrowedBuffer<ByteBuffer> outboundBuffer,
List<BufferMutator> decoders,
List<BufferMutator> encoders) {
this.deserializer = new MessageDeserializer(peer, protocol);
this.serializer = new MessageSerializer(peer, protocol);
this.inboundBuffer = inboundBuffer;
// process existing data immediately (e.g. there might be leftovers from MSE handshake)
fireDataReceived();
this.outboundBuffer = outboundBuffer;
this.decoders = decoders;
this.encoders = encoders;
this.inboundQueue = new LinkedBlockingQueue<>();
}
@Override
public Message decode() {
checkHandlerIsBound();
return inboundQueue.poll();
}
private void fireDataReceived() {
ByteBuffer buffer = inboundBuffer.lockAndGet();
try {
processInboundData(buffer);
} finally {
inboundBuffer.unlock();
}
}
private void processInboundData(ByteBuffer buffer) {
int undecodedDataLimit = buffer.position();
if (undecodedDataOffset < undecodedDataLimit) {
buffer.flip();
decoders.forEach(mutator -> {
buffer.position(undecodedDataOffset);
mutator.mutate(buffer);
});
undecodedDataOffset = undecodedDataLimit;
buffer.position(decodedDataOffset);
buffer.limit(undecodedDataOffset);
Message message;
for (;;) {
message = deserializer.deserialize(buffer);
if (message == null) {
break;
} else {
inboundQueue.add(message);
decodedDataOffset = buffer.position();
}
}
buffer.clear();
buffer.position(undecodedDataLimit);
if (!buffer.hasRemaining()) {
buffer.position(decodedDataOffset);
buffer.compact();
undecodedDataOffset -= decodedDataOffset;
buffer.position(undecodedDataOffset);
decodedDataOffset = 0;
}
}
}
@Override
public boolean encode(Message message) {
checkHandlerIsBound();
ByteBuffer buffer = outboundBuffer.lockAndGet();
if (buffer == null) {
// buffer has been released
return false;
}
try {
return writeMessageToBuffer(message, buffer);
} finally {
outboundBuffer.unlock();
}
}
private boolean writeMessageToBuffer(Message message, ByteBuffer buffer) {
buffer.clear();
boolean written = serializer.serialize(message, buffer);
if (written) {
encoders.forEach(mutator -> {
buffer.flip();
mutator.mutate(buffer);
});
buffer.flip();
}
return written;
}
private void checkHandlerIsBound() {
if (context == null) {
throw new IllegalStateException("Channel handler is not bound");
}
}
@Override
public ChannelHandlerContext bindHandler(ChannelHandler handler) {
if (context != null) {
if (handler == context.handler()) {
return context;
} else {
throw new IllegalStateException("Already bound to different handler");
}
}
context = new DefaultChannelHandlerContext(handler, this);
return context;
}
private class DefaultChannelHandlerContext implements ChannelHandlerContext {
private final ChannelHandler handler;
private final DefaultChannelPipeline pipeline;
DefaultChannelHandlerContext(ChannelHandler handler, DefaultChannelPipeline pipeline) {
this.handler = handler;
this.pipeline = pipeline;
}
ChannelHandler handler() {
return handler;
}
@Override
public ChannelPipeline pipeline() {
return pipeline;
}
@Override
public void fireChannelReady() {
handler.read();
}
@Override
public void fireChannelRegistered() {
// TODO
}
@Override
public void fireChannelUnregistered() {
// TODO
}
@Override
public void fireChannelActive() {
// TODO
}
@Override
public void fireChannelInactive() {
// TODO
}
@Override
public void fireDataReceived() {
pipeline.fireDataReceived();
}
}
}