Class SpdyHttpEncoder

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.channel.ChannelOutboundHandlerAdapter

io.netty.handler.codec.MessageToMessageEncoder<HttpObject>

io.netty.handler.codec.spdy.SpdyHttpEncoder

All Implemented Interfaces:

ChannelHandler, ChannelOutboundHandler

public class SpdyHttpEncoder
extends MessageToMessageEncoder<HttpObject>

Encodes HttpRequests, HttpResponses, and HttpContents into SpdySynStreamFrames and SpdySynReplyFrames.

Request Annotations

SPDY specific headers must be added to HttpRequests:

Header Name	Header Value
"X-SPDY-Stream-ID"	The Stream-ID for this request. Stream-IDs must be odd, positive integers, and must increase monotonically.
"X-SPDY-Priority"	The priority value for this request. The priority should be between 0 and 7 inclusive. 0 represents the highest priority and 7 represents the lowest. This header is optional and defaults to 0.

Response Annotations

SPDY specific headers must be added to HttpResponses:

Header Name	Header Value
"X-SPDY-Stream-ID"	The Stream-ID of the request corresponding to this response.

Pushed Resource Annotations

SPDY specific headers must be added to pushed HttpRequests:

Header Name	Header Value
"X-SPDY-Stream-ID"	The Stream-ID for this resource. Stream-IDs must be even, positive integers, and must increase monotonically.
"X-SPDY-Associated-To-Stream-ID"	The Stream-ID of the request that initiated this pushed resource.
"X-SPDY-Priority"	The priority value for this resource. The priority should be between 0 and 7 inclusive. 0 represents the highest priority and 7 represents the lowest. This header is optional and defaults to 0.

Required Annotations

SPDY requires that all Requests and Pushed Resources contain an HTTP "Host" header.

Optional Annotations

Requests and Pushed Resources must contain a SPDY scheme header. This can be set via the "X-SPDY-Scheme" header but otherwise defaults to "https" as that is the most common SPDY deployment.

Chunked Content

This encoder associates all HttpContents that it receives with the most recently received 'chunked' HttpRequest or HttpResponse.

Pushed Resources

All pushed resources should be sent before sending the response that corresponds to the initial request.

Nested Class Summary

Nested classes/interfaces inherited from interface ChannelHandler

ChannelHandler.Sharable

Field Summary

Fields

Modifier and Type	Field	Description
private int	currentStreamId
private final boolean	headersToLowerCase
private final boolean	validateHeaders

Constructor Summary

Constructors

Constructor	Description
SpdyHttpEncoder(SpdyVersion version)	Creates a new instance.
SpdyHttpEncoder(SpdyVersion version, boolean headersToLowerCase, boolean validateHeaders)	Creates a new instance.

Method Summary

Modifier and Type	Method	Description
private SpdyHeadersFrame	createHeadersFrame(HttpResponse httpResponse)
private SpdySynStreamFrame	createSynStreamFrame(HttpRequest httpRequest)
protected void	encode(ChannelHandlerContext ctx, HttpObject msg, java.util.List<java.lang.Object> out)	Encode from one message to an other.
private static boolean	isLast(HttpMessage httpMessage)	Checks if the given HTTP message should be considered as a last SPDY frame.

Methods inherited from class MessageToMessageEncoder

acceptOutboundMessage, write

Methods inherited from class ChannelOutboundHandlerAdapter

bind, close, connect, deregister, disconnect, flush, read

Methods inherited from class ChannelHandlerAdapter

ensureNotSharable, exceptionCaught, handlerAdded, handlerRemoved, isSharable

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface ChannelHandler

exceptionCaught, handlerAdded, handlerRemoved

Field Details

currentStreamId

private int currentStreamId

validateHeaders

private final boolean validateHeaders

headersToLowerCase

private final boolean headersToLowerCase

Constructor Details

SpdyHttpEncoder

public SpdyHttpEncoder(SpdyVersion version)

Creates a new instance.

Parameters:

version - the protocol version

SpdyHttpEncoder

public SpdyHttpEncoder(SpdyVersion version,
 boolean headersToLowerCase,
 boolean validateHeaders)

Creates a new instance.

Parameters:

version - the protocol version

headersToLowerCase - convert header names to lowercase. In a controlled environment, one can disable the conversion.

validateHeaders - validate the header names and values when adding them to the SpdyHeaders

Method Details

encode

protected void encode(ChannelHandlerContext ctx,
 HttpObject msg,
 java.util.List<java.lang.Object> out)
               throws java.lang.Exception

Description copied from class: MessageToMessageEncoder

Encode from one message to an other. This method will be called for each written message that can be handled by this encoder.

Specified by:

encode in class MessageToMessageEncoder<HttpObject>

Parameters:

ctx - the ChannelHandlerContext which this MessageToMessageEncoder belongs to

msg - the message to encode to an other one

out - the List into which the encoded msg should be added needs to do some kind of aggregation

Throws:

java.lang.Exception - is thrown if an error occurs

createSynStreamFrame

private SpdySynStreamFrame createSynStreamFrame(HttpRequest httpRequest)
                                         throws java.lang.Exception

Throws:

java.lang.Exception

createHeadersFrame

private SpdyHeadersFrame createHeadersFrame(HttpResponse httpResponse)
                                     throws java.lang.Exception

Throws:

java.lang.Exception

isLast

private static boolean isLast(HttpMessage httpMessage)

Checks if the given HTTP message should be considered as a last SPDY frame.

Parameters:

httpMessage - check this HTTP message

Returns:

whether the given HTTP message should generate a last SPDY frame.