3 Replies Latest reply on Jun 14, 2013 10:37 PM by jdestef

Question on how to monitor client bus health

jdestef Jun 14, 2013 10:34 AM

Hi,

I'm building an application that relies heavly on the CDI event model. During the login process an event is fired to the server to check the given credentials. If there ok then another event is fired to aimed at the client which will cause the app to procedd with the login. Before I tries to send the event to the server I stopped the server. Then I pressed the submitt button to send the message. Obviously since there is no server running now there is no return coming back. The app just sits on the login screen waiting for the return. Is there a way to detect that the bus is not connected to the server any longer? I looked into the Lifecycle listener bbut that doesn't seem to work? I'm using the latest 3.0-SNAPSHOT. Any guidence would be appreciated.

Thanks

1. Re: Question on how to monitor client bus health

jfuerth Jun 14, 2013 10:52 AM (in response to jdestef)

Hi John,

Yes, you can monitor the state of the client message bus by registering a BusLifecycleListener on the client. Here's an example of a GWT widget that turns different colours depending on the bus connection status (feel free to copy it as a starting point):

https://github.com/errai/errai/blob/master/errai-demos/errai-bus-demo-stress-test/src/main/java/org/jboss/errai/demo/busstress/client/local/BusStatusWidget.java

And here's how it gets registered with the bus:

https://github.com/errai/errai/blob/master/errai-demos/errai-bus-demo-stress-test/src/main/java/org/jboss/errai/demo/busstress/client/local/StressTestClient.java#L96

Hope that helps!
Jonathan
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2. Re: Question on how to monitor client bus health

edewit Jun 14, 2013 10:58 AM (in response to jdestef)

Hi John,

We have a nice undocumented fature called shadow services. You can implement the service interface and annotate it with @ShadowService the bus will route messages automaticly based on the status, so when offline they will go to the shadow implementation.

Cheers,
Erik Jan
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3. Re: Question on how to monitor client bus health

jdestef Jun 14, 2013 10:37 PM (in response to jdestef)

Thanks for the quick response guys, both great suggestions.
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