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Notifying ADF applications of database changes – fast and lean using Active Data Service for Server to Client Push – Part Two

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11 months ago
by Lucas Jellema in , ,

Yesterday I wrote that in two articles, I would demonstrate how we can ensure that changes in the database – new, changed or deleted data – can rapidly be reflected in ADF based user interfaces running in browsers. This story involves a two-step push-mechanism: push from database to middle tier and push from middle tier to browser. For the former – discussed in Notifying ADF applications of database changes – fast and lean using Database Query Result Change Notification – Part One – we will use the Oracle Database (and JDBC Driver) feature Query Result Change Notification and for the latter we leverage the Active Data Service in ADF Faces. The latter – server to browser push – is the topic of this second part. It will hook into where the first part took us (so you are advised to first read part one) and take the changes the database notifies us all the way up into the user interface.

A sketch of the architecture of the application we will create in this article looks like this:

The two push steps are marked with the green ellipses. The red box indicates the area under scrutiny in this article.

(more…)

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Notifying ADF applications of database changes – fast and lean using Database Query Result Change Notification – Part One

4
11 months ago
by Lucas Jellema in , ,

In two articles, I will demonstrate how we can ensure that changes in the database – new, changed or deleted data – can rapidly be reflected in ADF based user interfaces running in browsers. This story involves a two-step push-mechanism: push from database to middle tier and push from middle tier to browser. For the former – discussed in part 1 – we will use the Oracle Database (and JDBC Driver) feature Query Result Change Notification and for the latter we leverage the Active Data Service in ADF Faces. At the end of this first part in the series, you will have relevant changes in the database reported to the ADF application, almost instantaneously. The push to the user interface does not yet happen. However, any request from browser to server will serve to also refresh the relevant UI components, thanks to the declarative ‘piggy back’ mechanism that the ADF Binding framework provides us with.

The approach demonstrated here will work with Oracle Database 10g or 11g – provided you are using the 11g version of the JDBC drivers. Any version of ADF 11g will do on the application side.

The application architecture under scrutiny in part one can be sketched as follows – with the More >

SIG Event

ADF DataBinding: Yet another thing it does for you.

3 years ago
by Luc Bors in , , ,

Today I encountered something that I have seen frequently. While developing an ADF application developers tend to invoke methods on an application module directly, instead of invoking them via the bindings framework. You might get some unexpected results and some additional work too…

Correcting this behavior afterwards can be very annoying and time-consuming. In this blog, just to let developers know, I describe what you could do to prevent this error. (more…)

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