Java Reference
In-Depth Information
Listing 14.9.
CommandMessage
decoder
The code in this listing is relatively straightforward. The class is declared as a decoder
and parameterized with
AbstractCommand
—meaning that it'll convert the incom-
ing text into an
AbstractCommand
object (data type in ActionBazaar). There are two
lifecycle methods,
init()
and
destroy()
. The
willDecode
message will
be called first by the WebSocket implementation to find out if this decoder can handle the
message
. If it can, the
decode
method will be invoked
.
Encoders
Encoders are similar to decoders. The interface and subinterfaces are defined in
javax.websocket.Endcoder
. The only difference is that the methods are named
encode
and the return type and method parameters are swapped. The
CommandMes-
sage
encoder is shown in the following listing.
