What is implemetation difference between dojo.aspect and dojox.lang.aspect -

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while implementating aspect oriented programming getting confuse why dojo having 2 differentaspect library files?

when use 

dojo.aspect , dojox.lang.aspect ?

i have never heard dojox.lang.aspect before, according git log latest commit dates 2008.

you can find explanation why dojox.lang.aspect exists in article author eugene lazutkin: aop aspect of javascript dojo.

while doesn't make sense in cases, should realize primary role of dojo.connect() process dom events.

[...]

to sum up: events != aop. events cannot simulate aspects of aop, , aop cannot used in lieu of events.

so aop in javascript sounds simple! well, in reality there several sticky places:

  • implementing every single advice function expensive.
    • usually iterations more efficient recursive calls.
    • the size of call stack limited.
    • if have chained calls, it'll impossible rearrange them. if want remove 1 advice in middle, out of luck.
    • the “around” advice “eat” attached “before” , “after” advices changing order of execution. cannot guarantee anymore “before” advices run before “around” advices, , on.
  • usually in order decouple “around” advice original function, proceed() function used. calling result in calling next-in-chain around advice method or original method.
  • our aspect object in cases want static object, in other cases want dynamic object created taking account state of object operate upon.

these , other problems resolved in dojox.lang.aspect (currently in trunk, released in dojo 1.2).

as of latest dojo 1.7, there strong tendency differentiate between events , aspects, i.e. between dojo/on , dojo/aspect (both implemented via dojo.connect before).


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