[jira] Updated: (TUSCANY-2749) Some methods do not support multi-thread.

["Yuling Zhang (JIRA)" <de...@tuscany.apache.org>]

     [ https://issues.apache.org/jira/browse/TUSCANY-2749?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yuling Zhang updated TUSCANY-2749:
----------------------------------

    Attachment: SAX2Parser.cpp

Only stream_twice method is changed. I t uses another method of libxml2 to parse the xsd character string.

> Some methods do not support multi-thread.
> -----------------------------------------
>
>                 Key: TUSCANY-2749
>                 URL: https://issues.apache.org/jira/browse/TUSCANY-2749
>             Project: Tuscany
>          Issue Type: Bug
>          Components: C++ SDO
>    Affects Versions: Cpp-M3
>         Environment: Windows XP
> Visual C++6.0 
> CPP-tuscany_sdo-M3
> libxml2-2.7.2
> iconv-1.7.2
> zlib-1.2.3
> boost-1.33.1
>            Reporter: Yuling Zhang
>             Fix For: Cpp-Next
>
>         Attachments: SAX2Parser.cpp
>
>   Original Estimate: 168h
>  Remaining Estimate: 168h
>
> The methods object-serializing/object-antiserializing related will get failed in multi-threaded envoriment.
> They are as followed:
> //used when antiserializing a SDO object from a character string
> const char*  XSDHelperImpl::define(const char* schema, bool loadImportNamespace= "")
> //used when serializing a SDO object into a character string
> char* XMLHelperImpl::save(
>             DataObjectPtr dataObject,
>             const char* rootElementURI,
>             const char* rootElementName,
>             int indent= -1)
> // used when serializing a SDO object into a xml file
> void XMLHelperImpl::save(
>             DataObjectPtr dataObject,
>             const char* rootElementURI,
>             const char* rootElementName,
>             const char* xmlFile,
>             int indent = -1)
> //used when get a SOD object's shcema character string
> char* XSDHelperImpl::generate(
>             const TypeList& types,
>             const char* targetNamespaceURI = "",
>             int indent = -1)
> //used when get a SDO object's schema file
> void XSDHelperImpl::generateFile(
>             const TypeList& types,
>             const char* fileName, 
>             const char* targetNamespaceURI = "",
>             int indent = -1)
> (The multi-thread lib used to test these methods is boost-1.33.1.)
> All of them are successed in the first thread but get failed from the second thread.
> The exceptions are catched by "catch(...)" not by "catch (SDORuntimeException e)".
> Because only one method is successed in multi-threaded envoriment that serializs a SDO object from a file(it is defineFile from XSDHelperImpl), I made a comparision of it with the unsafe methods listed above. I find the reason of these mehtods getting failed in multi-threaeded envoriment is that they call some operations from libxml2 which are multi-thread unsafe. In the patch provided I changed the implemention of stream_twice method from SAX2Parser which is called by define method from XSDHelperImpl.The changement is mainly the replacment of unsafe method of libxml2 with a safe one. For the rest of the methods above, I do not find corresponding safe methods to replace the unsafe ones, so they still remain unresolved.

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