/*
* Copyright 2014 NAVER Corp.
*
* 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 com.navercorp.pinpoint.rpc.packet;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* @author emeroad
*/
public class PayloadPacket {
private static final Logger logger = LoggerFactory.getLogger(PayloadPacket.class);
private static final ChannelBuffer EMPTY_BUFFER = ChannelBuffers.buffer(0);
public static ChannelBuffer readPayload(ChannelBuffer buffer) {
if (buffer.readableBytes() < 4) {
buffer.resetReaderIndex();
return null;
}
final int payloadLength = buffer.readInt();
if (payloadLength <= 0) {
return EMPTY_BUFFER;
}
if (buffer.readableBytes() < payloadLength) {
buffer.resetReaderIndex();
return null;
}
return buffer.readBytes(payloadLength);
}
public static ChannelBuffer appendPayload(final ChannelBuffer header, final byte[] payload) {
if (payload == null) {
// this is also payload header
header.writeInt(-1);
return header;
} else {
header.writeInt(payload.length);
ChannelBuffer payloadWrap = ChannelBuffers.wrappedBuffer(payload);
return ChannelBuffers.wrappedBuffer(true, header, payloadWrap);
}
}
}