The Presentation Layer - Java EE 7 First Look - page 49

Thefollowingtableshowsadescriptionofprotocolupgrademethods,interfaces, and
classes:

Class/Interface Method Description

This method starts the up-
grade processing, instanti-
ates, and returns the handler
class that implements the Ht-
tpUpgradeHandler inter-
face.

HttpServletRequest HttpUpgradeHandler
upgrade(Class hand-
ler)

This method is called when
the upgrade operation is ac-
cepted by the Servlet. It takes
a WebConnection object to
allow the protocol handler
have access to the input/out-
put streams.

HttpUpgradeHandler void

init(WebConnection
wc)

This method is called when
the client disconnects.

void destroy()

This method gives access to
the input stream of the con-
nection.

WebConnection ServletInputStream

getInputStream()

This method gives access to
the output stream of the con-
nection.

ServletOutputStream
getOutputStream()