Pavitra Subramaniam created TRINIDAD-2402:
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Summary: mechanism to setup a new component binding context
Key: TRINIDAD-2402
URL: https://issues.apache.org/jira/browse/TRINIDAD-2402
Project: MyFaces Trinidad
Issue Type: Improvement
Affects Versions: 2.0.1-core
Reporter: Pavitra Subramaniam
There are usecases where a custom tag that provides the ability to load dynamic
layouts (or page fragments) based on app flow, requiring that new components be
re-created when the tag is executed and a new layout different from the current
one needs to be loaded.
Merely deleting the component sub-trees in the tag handler does not entirely
address the issue because when the tag is re-executed today, if a binding EL is
set on the component, then the component instance held by the backing bean
instance (typically a reuqest scoped bean) get reused instead of a new
component being created.
In order to force create the component instance, this new API will allow tag
handlers to notify the framework by starting a new "component binding context".
Between a pair of push and pop calls, component bindings will be cleared
allowing for new component instances to be created and pushed to the backing
bean.
/**
* Starts a new component binding context. Typically called from tag handlers
when component
* bindings in its subtree needs to be cleared, forcing the creation of new
components.
*
* @param context FacesContext instance
* @see RequestContext#popComponentBindingContext
* @see RequestContext#isInComponentBindingContext
*/
public static void pushComponentBindingContext(FacesContext context)
{
}
/**
* Pops out of the last pushed component binding context. Component binding
instances will not be
* cleared after popping out the outermost context.
*
* @param context FacesContext instance
* @see RequestContext#pushComponentBindingContext
* @see RequestContext#isInComponentBindingContext
*/
public static void popComponentBindingContext(FacesContext context)
{
}
/**
* Returns true if we are currently within a component binding context.
*
* @see RequestContext#pushComponentBindingContext
* @see RequestContext#popComponentBindingContext
*/
public static boolean isInComponentBindingContext(FacesContext context)
{
}
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