8:52 p.m.
The best way to do this is to use an Errai extension. Extensions get called a bootstrap
time, and have access to the context. You could then, in theory, map the Bus into JNDI or
whatever mechanism suits you. You simply just declare a class with the
ErraiConfigExtension and annotate it @ExtensionComponent, and the component will be
discovered and called when Errai bootstraps.
/**
* Create a config extension class so we can do things like setup the default tables
* when the application is deployed, etc.
*/
@ExtensionComponent
public class AppConfigurator implements ErraiConfigExtension {
private MessageBus bus;
@Inject
public AppConfigurator(MessageBus bus) {
this.bus = bus;
}
public void configure(Map<Class, Provider> bindings, Map<String, Provider>
resourceProviders) {
// provide extension points here
}
}
On 2010-02-05, at 5:44 PM, Kevin Jordan wrote:
Also, while I haven’t had to do this yet, but probably will in the
future, is there a way to grab the MessageBus outside a service? It would be in the same
application context, but I have a Mule ESB which will communicate with other external
services (and possibly a good deal of business logic there since I can chain services
there fairly easily to become a business flow) and I might want to broadcast something
from it to Errai subscribers. It’s not as simple as adding an @Inject (since I figure
the calling servlet is likely doing that) or an ErraiBus.get() like on the client side, is
it?
From: errai-users-bounces(a)lists.jboss.org [mailto:errai-users-bounces@lists.jboss.org] On
Behalf Of Kevin Jordan
Sent: Friday, February 05, 2010 4:18 PM
To: 'Mike Brock'
Cc: errai-users(a)lists.jboss.org
Subject: Re: [errai-users] Adding Marshalling/Demarshalling handlers?
So I need to:
1) Add a Marshaller via TypeMarshallers to encode the date on the client.
2) Add a TypeHandler via TypeHandlerFactory to decode the serialized date on the
client.
3) Add a TyperHandler via JSONEncoder to encode the date on the server.
4) Add a ConversionHandler via org.mvel2.DataConversion.addConversionHandler to
decode the serialized date on the server.
Does that about cover it?
From: Mike Brock [mailto:cbrock@redhat.com]
Sent: Friday, February 05, 2010 1:39 PM
To: Kevin Jordan
Cc: errai-users(a)lists.jboss.org
Subject: Re: [errai-users] Adding Marshalling/Demarshalling handlers?
Really the best way to handle it, is with TypeHandlerFactory, which exposes
addHandler();
So if you wanted to do what you're dong, you would implement a TypeHandler, that
would say, convert a Number to DatePicker.
public class NumberToDatePicker<Number, DatePicker> {
public DatePicker getConverted(Number n) {
return new DatePicker(in.longValue());
}
}
And you would then add that to TypeHandlerFactory like so:
TypeHandlerFactory.addHandler(Number.class, DatePicker.class, new NumberToDatePicker());
This of course presumes that you have an TypeHandler on the server that converts
DatePicker to a long, and you have an MVEL DataConverter on the server which converts back
from long to DatePicker on the server -- yes, this is incongruent and requires some
thought about how to unify this...
I have exposed a static method addEncodingHandler for JSONEncoder, so you can then add an
encoding handler like so:
JSONEncoder.addEncodingHandler(DatePicker.class, new TypeHandler() { public Long
getConverted(DatePicker picker) { return picker.getTime(); } });
...
You get the idea. You'll need to upgrade to trunk to get that working.
On 2010-02-05, at 11:49 AM, Kevin Jordan wrote:
Is there any easy way besides modifying JSONEncoder and TypeDemarshallHelper to add
something to convert a type for sending/receiving over the wire? I’m wanting to do a
subclass of Date for a DatePicker and want to serialize it a String so TimeZone
conversions don’t need to happen on it since it’ll default to midnight for whatever the
server timezone is. It seems as far as TypeDemarshallHelper, I can just do a static add
to org.mvel2.DataConversion, but for JSONEncoder is doesn’t seem that easy since the
handlers are added to a private Map. I assume on the client side, it’s as easy as adding
a CustomFieldSerializer (http://code.google.com/p/wogwt/wiki/CustomFieldSerializer)?
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