Hi Werner, Could you please respond to my questions below.
Thanks, -Sanjeev ------------- Original Message ---------------------------------------------------- Hi Werner, Thanks for your response. Please see my comments inlined below: > > if I were you, I would stop worrying about Castor's use of reflection, > as this is a one-time only penalty (as startup) if used correctly. One-time penalty of reflection for building the class descriptor is ok, but using reflection for every get/set of a field while marshalling / unmarshalling seems slow, since there will be millions of get/set method calls. What is the correct way to avoid reflection during marshalling / unmarshalling ? > Let me ask you a few questions, though: > > a) Will you be using a mapping file ? > b) Have you considered using the XML code generator to generate domain > classes (and descriptor classes) from your XML schema(s) ? I'm starting with a set of Java classes which are already in use by applications and cannot be changed. These Java classes need to be persisted in an XML store. I would prefer not to use a mapping file unless the default Castor Java->XML mapping needs to be changed for some class. > c) Have you already looked at the documentation of the > XMLClassDescriptorResolver ? Yes but it doesnt seem to provide a way to avoid using reflection during marshalling / unmarshalling. > d) Are you using Spring, and would you like to integrate Castor with > Spring ? No. > > And how did you measure performance when comparing Castor to JAXB ? I > find your questions very interesting, but you'd need to educate me a bit > more about your environment, etc. I'm going by: (a) The generally accepted wisdom that reflection is slow compared to normal Java method calls. (b) Performance numbers from comparisons done by others. Thanks much, -Sanjeev > Date: Mon, 12 Jan 2009 21:05:29 +0100 > From: [email protected] > To: [email protected] > Subject: Re: [castor-user] [XML] Non-reflective get/set > > Hi, > > any chances of resending your reply with proper indentation ? > > Regards > Werner > > Sanjeev Krishnan wrote: >> Hi Werner, Thanks for your response. Please see my comments inlined >> below:>> if I were you, I would stop worrying about Castor's use of >> reflection,> as this is a one-time only penalty (as startup) if used >> correctly. One-time penalty of reflection for building the class >> descriptor is ok, but using reflection for every get/set of a field >> while marshalling / unmarshalling seems slow, since there will be >> millions of get/set method calls.What is the correct way to avoid >> reflection during marshalling / unmarshalling ?> Let me ask you a >> few questions, though:>> a) Will you be using a mapping file ?> b) >> Have you considered using the XML code generator to generate domain> >> classes (and descriptor classes) from your XML schema(s) ? I'm >> starting with a set of Java classes which are already in use by >> applications and cannot be changed. These Java classesneed to be >> persisted in an XML store.I would prefer not to use a mapping file >> unless the default Castor Java->XML mapping needs to be changed for >> some class.> c) Have you already looked at the documentation of the> >> XMLClassDescriptorResolver ? Yes but it doesnt seem to provide a way >> to avoid using reflectionduring marshalling / unmarshalling.> d) Are >> you using Spring, and would you like to integrate Castor with> Spring >> ? >> >> No. >>>> And how did you measure performance when comparing Castor to JAXB >>>> ? I> find your questions very interesting, but you'd need to >>>> educate me a bit> more about your environment, etc. I'm going >>>> by:(a) The generally accepted wisdom that reflection is slow >>>> compared to normal Java method calls.(b) Performance numbers >>>> from comparisons done by others. Thanks much, -Sanjeev>> >>>> Regards> Werner>> Sanjeev Krishnan wrote:>>>> Hello,Is there >>>> a way to configure Castor-XML to avoid using>> reflection tocall >>>> get/set methods of objects during marshalling />> unmarshalling >>>> ?Reflection is supposed to be slower in general>> compared >>>> tocustom-generated code which calls the get/set methods.E.g.>> >>>> it should be possible to generate FieldHandlers usingcglib / asm >>>> />> BCEL at runtime, has anyone done that ?JAXB2.x seems to use >>>> generated>> code to call fields rather thanusing reflection is >>>> that the reason>> why JAXB2.0 is faster than Castor ?Castor >>>> seems ideal for my project>> (in terms of ease of use)however >>>> I'm trying to figure out if its>> performance will be as good as >>>> JAXB.Thanks,-Sanjeev>> >>>> _________________________________________________________________ ------------- Original Message --------------------------------------- Hello, Is there a way to configure Castor-XML to avoid using reflection to call get/set methods of objects during marshalling / unmarshalling ? Reflection is supposed to be slower in general compared to custom-generated code which calls the get/set methods. E.g. it should be possible to generate FieldHandlers using cglib / asm / BCEL at runtime, has anyone done that ? JAXB2.x seems to use generated code to call fields rather than using reflection is that the reason why JAXB2.0 is faster than Castor ? Castor seems ideal for my project (in terms of ease of use) however I'm trying to figure out if its performance will be as good as JAXB. Thanks, -Sanjeev ---------------------------------------------------------------------- _________________________________________________________________ Windows Live™: E-mail. Chat. Share. Get more ways to connect. http://windowslive.com/howitworks?ocid=TXT_TAGLM_WL_t2_allup_howitworks_012009 --------------------------------------------------------------------- To unsubscribe from this list, please visit: http://xircles.codehaus.org/manage_email
