At what point does CS acquire its data from the HDF backend database?
"Rod" <[email protected]> Tue, 14 Aug 2012 17:44:30 -0000
| Newsgroups | gmane.text.clearsilver.general |
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| Message-ID | <[email protected]> |
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I have an application that I'm developing, and hoping to use CS for part of=
it. It also uses the GNU libmicrohttpd for providing built-in HTTP server =
support.
Its basic functionality is that the tool runs for extended periods, all the=
while acquiring data in quasi-realtime from a proprietary fieldbus in a co=
ntrol system. The HTTP interface is to provide runtime updates to the end u=
ser, and to alter configuration of the tool.
In the (C-language) code, I first instantiate the HDF with hdf_init(), then=
instantiate a parser with cs_init(), associating the parser with the HDF. =
I then read the template file by calling cs_parse_file().=20
Finally, I launch the HTTP daemon thread, and spin around grabbing data fro=
m the wire, populating and updating the HDF database.=20
In a callback function launched by the HTTP library, I call cs_render(), wh=
ich generates a page according to the template, except that the template ma=
cros are never replaced by the HDF data. I know that the HDF data is being =
correctly recorded, since when I call hdf_write_file(), the expected data i=
s written to the file.
My theory is that the binding between the HDF data and the parser is done a=
t the time cs_parse_file() is called. If so, is there any way for the bindi=
ng to be 'renewed' to reflect the latest data?
Or, am I doing something fundamentally wrong? I do not want to re-read and =
parse the template file each time an HTTP request is to be serviced.
In a simple testbed, I am able to read the HDF data file using hdf_read_fil=
e(), parse the template and render the data as expected, so I feel confiden=
t that my code is generating and using the correct CS template syntax.
I seem to remember finding a small number of sample code fragments and/or a=
pplications online a while ago, but can't seem to locate them any more. Doe=
s anyone have links to those that still work?
Thanks.
--- rod.
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<p>I have an application that I'm developing, and hoping to use CS for part of it. It also uses the GNU libmicrohttpd for providing built-in HTTP server support.<br>
Its basic functionality is that the tool runs for extended periods, all the while acquiring data in quasi-realtime from a proprietary fieldbus in a control system. The HTTP interface is to provide runtime updates to the end user, and to alter configuration of the tool.<br>
<br>
In the (C-language) code, I first instantiate the HDF with hdf_init(), then instantiate a parser with cs_init(), associating the parser with the HDF. I then read the template file by calling cs_parse_file(). <br>
Finally, I launch the HTTP daemon thread, and spin around grabbing data from the wire, populating and updating the HDF database. <br>
In a callback function launched by the HTTP library, I call cs_render(), which generates a page according to the template, except that the template macros are never replaced by the HDF data. I know that the HDF data is being correctly recorded, since when I call hdf_write_file(), the expected data is written to the file.<br>
<br>
My theory is that the binding between the HDF data and the parser is done at the time cs_parse_file() is called. If so, is there any way for the binding to be 'renewed' to reflect the latest data?<br>
Or, am I doing something fundamentally wrong? I do not want to re-read and parse the template file each time an HTTP request is to be serviced.<br>
<br>
In a simple testbed, I am able to read the HDF data file using hdf_read_file(), parse the template and render the data as expected, so I feel confident that my code is generating and using the correct CS template syntax.<br>
<br>
I seem to remember finding a small number of sample code fragments and/or applications online a while ago, but can't seem to locate them any more. Does anyone have links to those that still work?<br>
<br>
Thanks.<br>
<br>
--- rod.<br>
<br>
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