/*
* Copyright 2002-2014 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 org.springframework.messaging.simp.stomp;
import java.nio.ByteBuffer;
import reactor.function.Consumer;
import reactor.function.Function;
import reactor.io.Buffer;
import reactor.io.encoding.Codec;
import org.springframework.messaging.Message;
import org.springframework.util.Assert;
/**
* A Reactor TCP {@link Codec} for sending and receiving STOMP messages.
*
* @author Andy Wilkinson
* @author Rossen Stoyanchev
* @since 4.0
*/
public class Reactor11StompCodec implements Codec<Buffer, Message<byte[]>, Message<byte[]>> {
private final StompDecoder stompDecoder;
private final StompEncoder stompEncoder;
private final Function<Message<byte[]>, Buffer> encodingFunction;
public Reactor11StompCodec() {
this(new StompEncoder(), new StompDecoder());
}
public Reactor11StompCodec(StompEncoder encoder, StompDecoder decoder) {
Assert.notNull(encoder, "'encoder' is required");
Assert.notNull(decoder, "'decoder' is required");
this.stompEncoder = encoder;
this.stompDecoder = decoder;
this.encodingFunction = new EncodingFunction(this.stompEncoder);
}
@Override
public Function<Buffer, Message<byte[]>> decoder(final Consumer<Message<byte[]>> messageConsumer) {
return new DecodingFunction(this.stompDecoder, messageConsumer);
}
@Override
public Function<Message<byte[]>, Buffer> encoder() {
return this.encodingFunction;
}
private static class EncodingFunction implements Function<Message<byte[]>, Buffer> {
private final StompEncoder encoder;
private EncodingFunction(StompEncoder encoder) {
this.encoder = encoder;
}
@Override
public Buffer apply(Message<byte[]> message) {
byte[] bytes = this.encoder.encode(message);
return new Buffer(ByteBuffer.wrap(bytes));
}
}
private static class DecodingFunction implements Function<Buffer, Message<byte[]>> {
private final StompDecoder decoder;
private final Consumer<Message<byte[]>> messageConsumer;
public DecodingFunction(StompDecoder decoder, Consumer<Message<byte[]>> next) {
this.decoder = decoder;
this.messageConsumer = next;
}
@Override
public Message<byte[]> apply(Buffer buffer) {
for (Message<byte[]> message : this.decoder.decode(buffer.byteBuffer())) {
this.messageConsumer.accept(message);
}
return null;
}
}
}