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@Retention(value=RUNTIME) @Target(value=TYPE) public @interface Connect
Annotation defining the server side connector that this ClientSideConnector
should connect to. The value must always by a class extending
ClientConnector
.
With this annotation client side Vaadin connector is marked to have a server side counterpart. The value of the annotation is the class of server side implementation.
Required Element Summary | |
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Class<? extends Connector> |
value
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Optional Element Summary | |
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Connect.LoadStyle |
loadStyle
Depending on the used WidgetMap generator, these optional hints may be used to define how the client side components are loaded by the browser. |
Element Detail |
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public abstract Class<? extends Connector> value
public abstract Connect.LoadStyle loadStyle
EagerWidgetMapGenerator
, but if the WidgetMapGenerator
is
used by the widgetset, these load style hints are respected.
Lazy loading of a widget implementation means the client side component
is not included in the initial JavaScript application loaded when the
application starts. Instead the implementation is loaded to the client
when it is first needed. Lazy loaded widget can be achieved by giving
Connect.LoadStyle.LAZY
value in Connect
annotation.
Lazy loaded widgets don't stress the size and startup time of the client side as much as eagerly loaded widgets. On the other hand there is a slight latency when lazy loaded widgets are first used as the client side needs to visit the server to fetch the client side implementation.
The Connect.LoadStyle.DEFERRED
will also not stress the initially loaded
JavaScript file. If this load style is defined, the widget implementation
is preemptively loaded to the browser after the application is started
and the communication to server idles. This load style kind of combines
the best of both worlds.
Fine tunings to widget loading can also be made by overriding
WidgetMapGenerator
in the GWT module. Tunings might be helpful if
the end users have slow connections and especially if they have high
latency in their network. The CustomWidgetMapGenerator
is an
abstract generator implementation for easy customization. Vaadin package
also includes LazyWidgetMapGenerator
that makes as many widgets
lazily loaded as possible.
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