Get application Module DataSource Name in ADF

Requirement – To get the using current Data source name in Application Module

Implementation- Following source code will help you getting this

Hashtable hashtable = getSession().getEnvironment();

System.out.println(" value of JDBC data source is : "+hashtable.get("JDBCDataSource"));

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Application Module Pooling in Oracle ADF

An application module pool is a collection of application module instances of the same type, such as an Orders application module or a Human Resources application module. This pool of application module instances is shared by multiple browser clients. The amount of time between submitting Web pages enables a smaller number of application module components to serve a larger number of active users. This reduces memory usage and improves performance.
This facility manages a configurable set of application module instances that grows and shrinks as the end-user load on your application changes during the day.

At any one time, the pool may contain application module instances that are partitioned into
three groups, based on their state. When the processing of a current HTTP request completes, the application module instance is checked back into the pool. If the AM instance has managed state, the pool keeps track that the AM is referenced by that particular session.
For example –
We have pool of 5 Application module instances. After having request from multiple browser , request will go to instance, which is available for time being.We have 3 state defined for appModule instances –
1- Available
2- Partially available- but referenced for preferred reuses by an another active session that would be more efficient due to the managed state of the application module.
3- Unavailable- because it is being used at that very moment by a Web container thread

You can configure application module pool behavior, sizing, and cleanup behavior. For more information about this, refer to the Fusion Developer’s Guide for ADF in online Help.

Note: Pools are created only for root application modules, not for nested ones that users access indirectly through a root application module.

In short –

Application module pooling:

• Enables users to share application modules
• Manages application state
• Provides the same instance or one with an identical state
when requested by an application with managed state

State management –
The PS_TXN and PS_TXN_SEQ are used by ADF to serialize user session state to the database (the state management schema).PS_TXN will only get created when/if an application module needs to be passivated. If your application module pool is big enough, it’s possible that you won’t see it get created.

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Executing bind variable from Application module in ADF – Techartifact

Requirment- To execute the bind variable from application module- Or executing view criteria on page load

Solution- Assumption that you created a view object and view criteria .Now you have bind variable in view criteria.
You are passing the value using some managed bean stored in some scope.

Open the application module and go to data model .Select the the view object in which view criteria is this.Click on edit.

In the edit view instance dialog the view criteria and shuttle to the in the bind parameter value ,open the expression builder
and put right value like – “adf.context.sessionScope.LabelTemplate.taskId” .Here LabelTemplate is managed bean stored in session scope.

That all. Now run the page where you using view object.and page will load with result of bind variable.But note you cant use this VO anywhere where you don’t need a bind variable.

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