1. You can read the code easier
2. time saving because of the number of reduced steps
3. possibility to use shared libs
See here a comparison what I mean:
1. Extract the given number from path /method/1234 => will set path.uri to 1234
OR
var IDfromPath=context.getVariable("proxy.pathsuffix").split("/").pop();
context.setVariable("path.uri",IDfromPath);
2. Difference on a service-callout - extracts the ObjectID from a callout and save it to variable "myID"
3 Steps needed: Instead of:
var ex1 = httpClient.get("http://www.someendpoint.com?some=value");
ex1.waitForComplete();
var result=JSON.stringify(ex1.getResponse().content);
context.setVariable("myID",result["objectID"]);
I found several examples for this - you know what I mean :-)
I actually agree to most of the points, but the
ReplyDeletequestion that persists is how big of an
overhead issue would be to implement most
of the policies through JS.
Don't get me wrong, i wholeheartedly agree
with you, but in cases of a lot of queries such
overhead can have significant impact.
Do you have any insight in such performance cost?
Hi Drago,
ReplyDeletethanks for your comment.
I don't say it is a good practice to transform every xml-policy to a javascript equivalent. But in some cases you can save a lot of work and you can maintain changes easier.
Because of the current rhino integration in some cases I would recommend xml-policies over javascript to be more stable. (I found some specials with extractVariables-policy and the use of variables in javascript functions)
As you can see I am writing no new blogs since two weeks, because there will be some new great upcoming apigee features - and they can all be handled with javascript.
So let us be patient to get the news (in the next few days..) and see what we can do then.
Hi Karsten,
ReplyDeletethat was fast response :)
Well, every direction has pros and cons. I've had enough problems
with building custom xml queris (with namespaces) to know that
current Rhino implementation isn't perfect, but it did work in the
end.
I hope to find some spare time one day to test the performance
difference between these two approaches, since i would also like
to use JS to simplify such cases.
Oh, btw, i see you use JSON.stringify, i needed to include that as
library file since from what i remember apigee doesn't provide
such API, did i miss something?
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