Re: [HAPI-devel] Hapi parse performance.

[Christian O. <chr...@gm...>]

Hi Mike,

check if 
http://hl7api.sourceforge.net/base/apidocs/ca/uhn/hl7v2/preparser/PreParser.html 
would help in your case, when you just need to extract a single field.

cheers
Christian

Am 29.06.2017 um 03:17 schrieb Mike Mills:
> Hi,
>
> Are the any efforts being made to improve the performance of parsing 
> an hl7 message?
>
> I am considering dropping parsing of messages using hapi because of 
> the CPU load and memory requirements.
>
> It seems like Hapi parses like a DOM parser as it goes though the 
> entire message.
>
> It would be good if the message was lazily parsed so that no parsing 
> occurs until a teaser.get call is made, or an accessor called on the 
> concrete message object returned from parse(). When the terser path is 
> executed only the required segment/group/field/sub fields are 
> processed to retrieve the desired value.
>
> That way, if we wanted just the MSH9-2 the copy expense of parsing an 
> entire message is not required.
>
> My initial performance testing indicates that the JVM dropped from 10% 
> CPU usage with Hapi to 3% CPU usage when using string.split().
>
> Are there efforts being made to address the performance of Hapi?
>
> Kind regards.
>
> Mike
>
>
>
>
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