io.netty.handler.codec.stomp

Class StompSubframeAggregator

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.handler.codec.MessageToMessageDecoder<I>

io.netty.handler.codec.MessageAggregator<StompSubframe,StompHeadersSubframe,StompContentSubframe,StompFrame>

io.netty.handler.codec.stomp.StompSubframeAggregator

All Implemented Interfaces:

ChannelHandler

public class StompSubframeAggregator
extends MessageAggregator<StompSubframe,StompHeadersSubframe,StompContentSubframe,StompFrame>

A ChannelHandler that aggregates an StompHeadersSubframe and its following StompContentSubframes into a single StompFrame. It is useful when you don't want to take care of STOMP frames whose content is 'chunked'. Insert this handler after StompSubframeDecoder in the ChannelPipeline:

Nested Class Summary

Nested classes/interfaces inherited from interface io.netty.channel.ChannelHandler

ChannelHandler.Sharable, ChannelHandler.Skip

Constructor Summary

Constructors

Constructor and Description
StompSubframeAggregator(int maxContentLength) Creates a new instance.

Method Summary

Methods

Modifier and Type	Method and Description
protected StompFrame	beginAggregation(StompHeadersSubframe start, ByteBuf content) Creates a new aggregated message from the specified start message and the specified content.
protected long	contentLength(StompHeadersSubframe start) Retrieves the length of the whole content from the specified start message.
protected boolean	hasContentLength(StompHeadersSubframe start) Returns true if and only if the specified start message already contains the information about the length of the whole content.
protected boolean	isAggregated(StompSubframe msg) Returns true if and only if the specified message is already aggregated.
protected boolean	isContentMessage(StompSubframe msg) Returns true if and only if the specified message is a content message.
protected boolean	isLastContentMessage(StompContentSubframe msg) Returns true if and only if the specified message is the last content message.
protected boolean	isStartMessage(StompSubframe msg) Returns true if and only if the specified message is a start message.
protected Object	newContinueResponse(StompHeadersSubframe start) Returns the 'continue response' for the specified start message if necessary.

Methods inherited from class io.netty.handler.codec.MessageAggregator

acceptInboundMessage, aggregate, channelInactive, ctx, decode, finishAggregation, handleOversizedMessage, handlerAdded, handlerRemoved, isHandlingOversizedMessage, maxContentLength, maxCumulationBufferComponents, setMaxCumulationBufferComponents

Methods inherited from class io.netty.handler.codec.MessageToMessageDecoder

channelRead

Methods inherited from class io.netty.channel.ChannelHandlerAdapter

bind, channelActive, channelReadComplete, channelRegistered, channelUnregistered, channelWritabilityChanged, close, connect, deregister, disconnect, exceptionCaught, flush, isSharable, read, userEventTriggered, write

Methods inherited from class java.lang.Object

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

Constructor Detail

StompSubframeAggregator

public StompSubframeAggregator(int maxContentLength)

Creates a new instance.

Parameters:

maxContentLength - the maximum length of the aggregated content. If the length of the aggregated content exceeds this value, a TooLongFrameException will be raised.

Method Detail

isStartMessage

protected boolean isStartMessage(StompSubframe msg)
                          throws Exception

Description copied from class: MessageAggregator

Returns true if and only if the specified message is a start message. Typically, this method is implemented as a single return statement with instanceof:

 return msg instanceof MyStartMessage;
 

Specified by:

isStartMessage in class MessageAggregator<StompSubframe,StompHeadersSubframe,StompContentSubframe,StompFrame>

Throws:

Exception

isContentMessage

protected boolean isContentMessage(StompSubframe msg)
                            throws Exception

Description copied from class: MessageAggregator

Returns true if and only if the specified message is a content message. Typically, this method is implemented as a single return statement with instanceof:

 return msg instanceof MyContentMessage;
 

Specified by:

isContentMessage in class MessageAggregator<StompSubframe,StompHeadersSubframe,StompContentSubframe,StompFrame>

Throws:

Exception

isLastContentMessage

protected boolean isLastContentMessage(StompContentSubframe msg)
                                throws Exception

Description copied from class: MessageAggregator

Returns true if and only if the specified message is the last content message. Typically, this method is implemented as a single return statement with instanceof:

 return msg instanceof MyLastContentMessage;
 

or with instanceof and boolean field check:

 return msg instanceof MyContentMessage && msg.isLastFragment();
 

Specified by:

isLastContentMessage in class MessageAggregator<StompSubframe,StompHeadersSubframe,StompContentSubframe,StompFrame>

Throws:

Exception

isAggregated

protected boolean isAggregated(StompSubframe msg)
                        throws Exception

Description copied from class: MessageAggregator

Returns true if and only if the specified message is already aggregated. If this method returns true, this handler will simply forward the message to the next handler as-is.

Specified by:

isAggregated in class MessageAggregator<StompSubframe,StompHeadersSubframe,StompContentSubframe,StompFrame>

Throws:

Exception

hasContentLength

protected boolean hasContentLength(StompHeadersSubframe start)
                            throws Exception

Description copied from class: MessageAggregator

Returns true if and only if the specified start message already contains the information about the length of the whole content.

Specified by:

hasContentLength in class MessageAggregator<StompSubframe,StompHeadersSubframe,StompContentSubframe,StompFrame>

Throws:

Exception

contentLength

protected long contentLength(StompHeadersSubframe start)
                      throws Exception

Description copied from class: MessageAggregator

Retrieves the length of the whole content from the specified start message. This method is invoked only when MessageAggregator.hasContentLength(Object) returned true.

Specified by:

contentLength in class MessageAggregator<StompSubframe,StompHeadersSubframe,StompContentSubframe,StompFrame>

Throws:

Exception

newContinueResponse

protected Object newContinueResponse(StompHeadersSubframe start)
                              throws Exception

Description copied from class: MessageAggregator

Returns the 'continue response' for the specified start message if necessary. For example, this method is useful to handle an HTTP 100-continue header.

Specified by:

newContinueResponse in class MessageAggregator<StompSubframe,StompHeadersSubframe,StompContentSubframe,StompFrame>

Returns:

the 'continue response', or null if there's no message to send

Throws:

Exception

beginAggregation

protected StompFrame beginAggregation(StompHeadersSubframe start,
                          ByteBuf content)
                               throws Exception

Description copied from class: MessageAggregator

Creates a new aggregated message from the specified start message and the specified content. If the start message implements ByteBufHolder, its content is appended to the specified content. This aggregator will continue to append the received content to the specified content.

Specified by:

beginAggregation in class MessageAggregator<StompSubframe,StompHeadersSubframe,StompContentSubframe,StompFrame>

Throws:

Exception