Geoff Longman wrote:
Right now expressions that invoke listeners are like this:Instead of having an event like "doSomething(IRequestCycle cycle)" implemented on an object why not have a generic one that will forward to an OGNL lambda expression? This would allow you to not have to code up an entire class to implement a listener for simple cases like described above. An OGNL lambda expression is an expression that is compiled to an AST that can then be executed at a later time.
listeners.doSomething
where doSomething is a method with the correct signature:
public void doSomething(IRequestCycle cycle) throws RequestCycleException
Why not extend this to make it possible to implement simple listeners
directly in OGNL?
i.e. make the expression the listener. I'm finding that I'm building pages
using aggregation with beans
more than extending a Page class these days. Would cut down on the code
writing if I were able
to manipulate my beans without declaring the listener methods.
One could extend the OGNL context to contain the cycle as well as the
component. This would
allow one to replace the method declaration with simple expressions like:
cycle.setPage("Home")
beans.myBean.incrementCounter()
etc.
Any thoughts?
Example:
#myExpression = :[ doSomething() ]
#myExpression(newRootObject)
Will cause doSomething to be called on newRootObject. The calling syntax is NOT parameters; only one is allowed and it becomes the root object for the called expression.
- Drew
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< Drew Davidson | OGNL Technology >
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