org.springframework.messaging.rsocket.PayloadUtils Maven / Gradle / Ivy
/*
* Copyright 2002-2019 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
*
* https://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.rsocket;
import java.nio.ByteBuffer;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.rsocket.Payload;
import io.rsocket.util.ByteBufPayload;
import io.rsocket.util.DefaultPayload;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.core.io.buffer.DefaultDataBuffer;
import org.springframework.core.io.buffer.NettyDataBuffer;
import org.springframework.core.io.buffer.NettyDataBufferFactory;
/**
* Static utility methods to create {@link Payload} from {@link DataBuffer}s
* and vice versa.
*
* @author Rossen Stoyanchev
* @since 5.2
*/
public abstract class PayloadUtils {
/**
* Use this method to slice, retain and wrap the data portion of the
* {@code Payload}, and also to release the {@code Payload}. This assumes
* the Payload metadata has been read by now and ensures downstream code
* need only be aware of {@code DataBuffer}s.
* @param payload the payload to process
* @param bufferFactory the DataBufferFactory to wrap with
* @return the created {@code DataBuffer} instance
*/
public static DataBuffer retainDataAndReleasePayload(Payload payload, DataBufferFactory bufferFactory) {
try {
if (bufferFactory instanceof NettyDataBufferFactory) {
ByteBuf byteBuf = payload.sliceData().retain();
return ((NettyDataBufferFactory) bufferFactory).wrap(byteBuf);
}
else {
return bufferFactory.wrap(payload.getData());
}
}
finally {
if (payload.refCnt() > 0) {
payload.release();
}
}
}
/**
* Create a Payload from the given metadata and data.
* If at least one is {@link NettyDataBuffer} then {@link ByteBufPayload}
* is created with either obtaining the underlying native {@link ByteBuf}
* or using {@link Unpooled#wrappedBuffer(ByteBuffer...)} if necessary.
* Otherwise, if both are {@link DefaultDataBuffer}, then
* {@link DefaultPayload} is created.
* @param data the data part for the payload
* @param metadata the metadata part for the payload
* @return the created payload
*/
public static Payload createPayload(DataBuffer data, DataBuffer metadata) {
return data instanceof NettyDataBuffer || metadata instanceof NettyDataBuffer ?
ByteBufPayload.create(asByteBuf(data), asByteBuf(metadata)) :
DefaultPayload.create(asByteBuffer(data), asByteBuffer(metadata));
}
/**
* Create a Payload with data only. The created payload is
* {@link ByteBufPayload} if the input is {@link NettyDataBuffer} or
* otherwise it is {@link DefaultPayload}.
* @param data the data part for the payload
* @return created payload
*/
public static Payload createPayload(DataBuffer data) {
return data instanceof NettyDataBuffer ?
ByteBufPayload.create(asByteBuf(data)) : DefaultPayload.create(asByteBuffer(data));
}
static ByteBuf asByteBuf(DataBuffer buffer) {
return buffer instanceof NettyDataBuffer ?
((NettyDataBuffer) buffer).getNativeBuffer() : Unpooled.wrappedBuffer(buffer.asByteBuffer());
}
private static ByteBuffer asByteBuffer(DataBuffer buffer) {
return buffer instanceof DefaultDataBuffer ?
((DefaultDataBuffer) buffer).getNativeBuffer() : buffer.asByteBuffer();
}
}