/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.facebook.infrastructure.net.io;
import com.facebook.infrastructure.net.MessagingService;
import com.facebook.infrastructure.utils.*;
import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;
import java.io.IOException;
/**
* Author : Avinash Lakshman ( alakshman@facebook.com) & Prashant Malik ( pmalik@facebook.com )
*/
public class ProtocolHeaderState extends StartState
{
private ByteBuffer buffer_;
public ProtocolHeaderState(TcpReader stream)
{
super(stream);
buffer_ = ByteBuffer.allocate(4);
}
public byte[] read() throws IOException, ReadNotCompleteException
{
return doRead(buffer_);
}
public void morphState() throws IOException
{
byte[] protocolHeader = buffer_.array();
int pH = MessagingService.byteArrayToInt(protocolHeader);
int type = MessagingService.getBits(pH, 1, 2);
stream_.getProtocolHeader().serializerType_ = type;
int stream = MessagingService.getBits(pH, 3, 1);
stream_.getProtocolHeader().isStreamingMode_ = (stream == 1) ? true : false;
if ( stream_.getProtocolHeader().isStreamingMode_ )
MessagingService.setStreamingMode(true);
int listening = MessagingService.getBits(pH, 4, 1);
stream_.getProtocolHeader().isListening_ = (listening == 1) ? true : false;
int version = MessagingService.getBits(pH, 15, 8);
stream_.getProtocolHeader().version_ = version;
if ( version <= MessagingService.getVersion() )
{
if ( stream_.getProtocolHeader().isStreamingMode_ )
{
StartState nextState = stream_.getSocketState(TcpReader.TcpReaderState.CONTENT_STREAM);
if ( nextState == null )
{
nextState = new ContentStreamState(stream_);
stream_.putSocketState( TcpReader.TcpReaderState.CONTENT_STREAM, nextState );
}
stream_.morphState( nextState );
buffer_.clear();
}
else
{
StartState nextState = stream_.getSocketState(TcpReader.TcpReaderState.CONTENT_LENGTH);
if ( nextState == null )
{
nextState = new ContentLengthState(stream_);
stream_.putSocketState( TcpReader.TcpReaderState.CONTENT_LENGTH, nextState );
}
stream_.morphState( nextState );
buffer_.clear();
}
}
else
{
throw new IOException("Invalid version in message. Scram.");
}
}
public void setContextData(Object data)
{
throw new UnsupportedOperationException("This method is not supported in the ProtocolHeaderState");
}
}