Since the RPGNEXTGEN JSON service program works well (and is embedded in lots of places here) but is appallingly slow at parsing strings, I have left it alone and simply replaced all calls the json_parse() with my own YAJL wrapper called yajl_parseinto(). So this uses Scott's port of the YASL parser, and then walks through the tree building an rpgnextgen json object. Despite doing all this work, the difference is still significantly faster:
JSON parse=16022ms
YAJL parse=322ms
-----Original Message-----
From: WEB400 [mailto:web400-bounces@xxxxxxxxxxxx] On Behalf Of Kevin Turner
Sent: 01 June 2015 21:49
To: Web Enabling the IBM i (AS/400 and iSeries)
Subject: Re: [WEB400] receiving POST encoded in JSON
Not as stunned as me - because I am using it in production, and now face a rather onerous re-engineering process :( Serves me right for not doing more thorough research into the options. On the flip side, it does help me explain some trouble performance bottlenecks.
As it happens, I do have a "use case" where I need to walk through a JSON with no prior knowledge of its exact content. It involves simply comparing the JSON (a data model for a context) with the previous version (stored in a session) to work out what the delta is. I basically need to know that a node is new, missing or changed to build the delta with no assumed knowledge of what the nodes are. I expect the yajl_xxxx_parse will enable me to do this.
-----Original Message-----
From: WEB400 [mailto:web400-bounces@xxxxxxxxxxxx] On Behalf Of Nathan Andelin
Sent: 01 June 2015 21:39
To: Web Enabling the IBM i (AS/400 and iSeries)
Subject: Re: [WEB400] receiving POST encoded in JSON
Scott,
Thanks for the additional information. I was so stunned by Kevin's report of performance differences between your service program and that of Mihael Schmidt; I was looking for an explanation. Unfortunately, I'm not well versed in either; I haven't had a requirement to "consume" JSON under IBM i yet. I'm interested in the topic, however.
I agree that "applications" typically know the format of JSON documents in advance. An API that makes it easy to "find" the content you're looking for is intuitive in that case.
I've been toying with writing a JavaScript utility that "merges" HTML templates with JSON objects, where neither the format of the HTML nor the JSON would be known in advance. I suppose that may have triggered the idea of a similar use case under IBM i, though that is just an abstract notion at this point.
I view the topic of JSON to be relevant to the topic of single-page applications, client-side frameworkd, and possibly server-side web-service frameworks, which we have been discussing during the past few weeks.
--
This is the Web Enabling the IBM i (AS/400 and iSeries) (WEB400) mailing list To post a message email: WEB400@xxxxxxxxxxxx To subscribe, unsubscribe, or change list options,
visit:
http://lists.midrange.com/mailman/listinfo/web400
or email: WEB400-request@xxxxxxxxxxxx
Before posting, please take a moment to review the archives at
http://archive.midrange.com/web400.
___________________________________________
This email has been scanned by iomartcloud.
http://www.iomartcloud.com/
________________________________
NOTICE: The information in this electronic mail transmission is intended by CoralTree Systems Ltd for the use of the named individuals or entity to which it is directed and may contain information that is privileged or otherwise confidential. If you have received this electronic mail transmission in error, please delete it from your system without copying or forwarding it, and notify the sender of the error by reply email or by telephone, so that the sender's address records can be corrected.
--------------------------------------------------------------------------------
CoralTree Systems Limited
Company Registration Number 5021022.
Registered Office:
12-14 Carlton Place
Southampton
Hampshire
SO15 2EA
VAT Registration Number 834 1020 74.
--
This is the Web Enabling the IBM i (AS/400 and iSeries) (WEB400) mailing list To post a message email: WEB400@xxxxxxxxxxxx To subscribe, unsubscribe, or change list options,
visit:
http://lists.midrange.com/mailman/listinfo/web400
or email: WEB400-request@xxxxxxxxxxxx
Before posting, please take a moment to review the archives at
http://archive.midrange.com/web400.
___________________________________________
This email has been scanned by iomartcloud.
http://www.iomartcloud.com/
________________________________
NOTICE: The information in this electronic mail transmission is intended by CoralTree Systems Ltd for the use of the named individuals or entity to which it is directed and may contain information that is privileged or otherwise confidential. If you have received this electronic mail transmission in error, please delete it from your system without copying or forwarding it, and notify the sender of the error by reply email or by telephone, so that the sender's address records can be corrected.
--------------------------------------------------------------------------------
CoralTree Systems Limited
Company Registration Number 5021022.
Registered Office:
12-14 Carlton Place
Southampton
Hampshire
SO15 2EA
VAT Registration Number 834 1020 74.
midrange.com
