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Date: Thu, 06 Mar 2014 17:26:09 +0000
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To: Chris Wright <daverandom@php.net>
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Subject: Re: [PHP-DEV] using Zend: extensions module: Accessing instance data
 internally
From: oneil@saxonica.com (O'Neil Delpratt)

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On 06/03/14 17:08, Chris Wright wrote:
> On 6 March 2014 16:12, O'Neil Delpratt <oneil@saxonica.com> wrote:
>> Hi,
>>
>> I have two created two php objects in my extension module called
>> SaxonProcessor and XdmValue:
>>
>> struct saxonProcessor_object {
>>      zend_object std;
>>      SaxonProcessor * saxonProcessor;
>>      XsltProcessor *xsltProcessor;
>>      XQueryProcessor *xqueryProcessor;
>>      XdmValue * xdmValue;
>>      char * stylesheetFile;
>>      char * stylesheetStr;
>>      char * queryFile;
>>      char * queryStr;
>> };
>>
>>
>> struct xdmValue_object {
>>      zend_object std;
>>      XdmValue * xdmValue;
>> };
>>
>>
>> In the XdmValue_object I need to pass internally the C++ SaxonProcessor
>> object in the saxonProcessor_object, but I am not sure how to do this
>> because in the XdmValue constructor the getThis() method allows me to gain
>> access to the xdmValue_object struct:
>>
>>   xdmValue_object *obj = (xdmValue_object *)zend_object_store_get_object(
>>          getThis() TSRMLS_CC);
>>
>> Any ideas?
> I'm not 100% sure what you are asking here so if this comes off as
> patronising then I'm sorry :-P
>
> It sounds like what you have is simply a classic circular reference
> thru dependency injection problem. A good paradigm for solving this is
> to have one object create the other and inject itself in the process.
>
> Can you explain the userland PHP API you are trying to create here?
> >From reading the documentation for Saxon I can't see why a Processor
> would have a member which is an XdmValue or, to be honest, vice versa.
> They both seem to operate independently of each other.
>
> Thanks, Chris
>
The problem is the SaxonProcessor is the main class stores configuration 
information shared across all the processors, for example a namepool is 
cached.

The work around which I have now tried and it works is to create the 
XdmValue via the the SaxonProcessor class as a factory function and not 
independently.

A separate issue I have is how to maintain thread safety in a NTS 
version of PHP. The SaxonProcessor contains some third-party dependency 
library which restricts more than one instance created at anyone time. I 
notice that some time PHP requests are not closed before another one 
starts which results in the a crash of the library.

Thanks and kind regards,

O'Neil

-- 
O'Neil Delpratt
Software Developer, Saxonica Limited
Email: oneil@saxonica.com <mailto:oneil@saxonica.com>
Tel: +44 118 946 5894
Web: http://www.saxonica.com
Saxonica Community Site: http://dev.saxonica.com Saxonica Bug tracking 
System: https://saxonica.plan.io/

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