12 Oct
2012
12 Oct
'12
9:27 a.m.
Hi everyone,
I would like to propose to introduce a possibility to associate
properties in the execution context with metadata by declaring them. We
introduce the class 'ExecutionContextProperty' that will store the
metadata attributes, in addition to the actual property value.
/**
* Declare a property in the execution context.
*
* @param key The key that names the property
* @param property The property to declare.
*/
public void declareProperty(String key, ExecutionContextProperty property)
The metadata governs how the property should be treated when managing
the execution contexts. For instance, these attributes could be supported:
* Read-only - The value may not be updated within the the execution
context.
* Inherited - The property will be inherited from the current context
when replacing the execution context within the scope of a request.
* Clone - Also clone the value when the execution context is cloned.
* Type - The class of the value, for typechecking when replacing
the value.
* Non-null - The value may not be null
So, the arguments for this proposal are at least two:
1. Catch errors early and simplify debugging.
2. Convenience of having properties automatically maintained across
execution contexts within the same request cycle.
What do you think?
I would like to implement and merge this ASAP.
Best Regards,
/Andreas