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linux user

2006-Aug-07 13:52 UTC

[Rails] Store SOAP::RPC::Driver in user session throws TypeError

Hi All

I have a
requirement to consume a 3rd party web service from my Rails
application. I am doing this
in my action

require ''soap/wsdlDriver''
factory = SOAP::WSDLDriverFactory.new(TRANSIDIOM_WSDL_URL)
soap = factory.create_rpc_driver
soap.wiredump_file_base="#{RAILS_ROOT}/log/transidiom.log"

param = %(<Request
name="com.wm.ccv.rpgrouter.seagull.CustomerProfileResCom">
<Input> <CompanyCode>110</CompanyCode>
<CustomerNumber>2442</CustomerNumber>
<UserName>ccvdev2</UserName>
<Password>ccvdev2</Password>
<LibrarySuffix>ORC</LibrarySuffix>
<targetHost>wmasprod</targetHost>
</Input> </Request>)

result = soap..retrieveCustomerData(param)

I get the expected result, but the real problem is performance since I have
to re-create the rpc-driver to the same service on each request. So I try
and store the soap object which is SOAP::RPC::Driver type.

session[:soap] = soap

and I get TypeError (singleton can''t be dumped):
C:/ruby/lib/ruby/1.8/pstore.rb:348:in `dump''
C:/ruby/lib/ruby/1.8/pstore.rb:348:in `dump''
C:/ruby/lib/ruby/1.8/pstore.rb:326:in `transaction''
C:/ruby/lib/ruby/1.8/cgi/session/pstore.rb:90:in `update''
C:/ruby/lib/ruby/1.8/cgi/session/pstore.rb:97:in `close''
C:/ruby/lib/ruby/1.8/cgi/session.rb:330:in `close''
C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/base.rb:984:in
`close_session''

Now ofcourse I realize that RPC Driver has some singleton object or
anonymous class/method which can''t be serialized hence the TypeError.
My
question is what can I do to improve the performance and reduce the overhead
of creating new RPC Driver objects on each request.


Thanks
-daya
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Ola Bini

2006-Aug-07 14:01 UTC

head link

[Rails] Store SOAP::RPC::Driver in user session throws TypeError

linux user wrote:> Hi All
> 
> I have a 
> requirement to consume a 3rd party web service from my Rails application. I
am doing this
> in my action
> 
> require ''soap/wsdlDriver''
> factory = SOAP::WSDLDriverFactory.new(TRANSIDIOM_WSDL_URL)
> soap = factory.create_rpc_driver
> soap.wiredump_file_base="#{RAILS_ROOT}/log/transidiom.log"
> 
> param = %(<Request 
> name="com.wm.ccv.rpgrouter.seagull.CustomerProfileResCom">
<Input>
> <CompanyCode>110</CompanyCode>
<CustomerNumber>2442</CustomerNumber>
> <UserName>ccvdev2</UserName>
<Password>ccvdev2</Password>
> <LibrarySuffix>ORC</LibrarySuffix>
<targetHost>wmasprod</targetHost>
> </Input> </Request>)
> 
> result = soap..retrieveCustomerData(param)
> 
> I get the expected result, but the real problem is performance since I 
> have to re-create the rpc-driver to the same service on each request. So 
> I try and store the soap object which is SOAP::RPC::Driver type.
>  
> session[:soap] = soap
> 
> and I get TypeError (singleton can''t be dumped):
> C:/ruby/lib/ruby/1.8/pstore.rb:348:in `dump''
> C:/ruby/lib/ruby/1.8/pstore.rb:348:in `dump''
> C:/ruby/lib/ruby/1.8/pstore.rb:326:in `transaction''
> C:/ruby/lib/ruby/1.8/cgi/session/pstore.rb:90:in `update''
> C:/ruby/lib/ruby/1.8/cgi/session/pstore.rb:97:in `close''
> C:/ruby/lib/ruby/1.8/cgi/session.rb:330:in `close''
> C:/ruby/lib/ruby/gems/1.8/gems/actionpack- 
> 1.12.1/lib/action_controller/base.rb:984:in `close_session''
> 
> Now ofcourse I realize that RPC Driver has some singleton object or 
> anonymous class/method which can''t be serialized hence the
TypeError. My
> question is what can I do to improve the performance and reduce the 
> overhead of creating new RPC Driver objects on each request.
> 
> 
> Thanks
> -daya
> 
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
You don''t store the driver itself in the session but in global
singleton
objects. That''s the approach I used not long time ago for exactly this 
kind of problem.

I just had someting like this in my model class
  if @@driver.nil?
    @@driver = SoapWsdlDriver.new
  end
  @@driver.customWebServiceCall



-- 
  Ola Bini (http://ola-bini.blogspot.com)
  JvYAML, RbYAML, JRuby and Jatha contributor
  System Developer, Karolinska Institutet (http://www.ki.se)
  OLogix Consulting (http://www.ologix.com)

  "Yields falsehood when quined" yields falsehood when quined.

linux user

2006-Aug-07 15:08 UTC

head link

[Rails] Store SOAP::RPC::Driver in user session throws TypeError

Ola, this is a Good idea but can it give rise race conditions?? or are there
anyother implications which might be painful to debug/fix in the long run?

On 8/7/06, Ola Bini <ola.bini@ki.se> wrote:>
> linux user wrote:
> > Hi All
> >
> > I have a
> > requirement to consume a 3rd party web service from my Rails
> application. I am doing this
> > in my action
> >
> > require ''soap/wsdlDriver''
> > factory = SOAP::WSDLDriverFactory.new(TRANSIDIOM_WSDL_URL)
> > soap = factory.create_rpc_driver
> > soap.wiredump_file_base="#{RAILS_ROOT}/log/transidiom.log"
> >
> > param = %(<Request
> >
name="com.wm.ccv.rpgrouter.seagull.CustomerProfileResCom">
<Input>
> > <CompanyCode>110</CompanyCode>
<CustomerNumber>2442</CustomerNumber>
> > <UserName>ccvdev2</UserName>
<Password>ccvdev2</Password>
> > <LibrarySuffix>ORC</LibrarySuffix>
<targetHost>wmasprod</targetHost>
> > </Input> </Request>)
> >
> > result = soap..retrieveCustomerData(param)
> >
> > I get the expected result, but the real problem is performance since I
> > have to re-create the rpc-driver to the same service on each request.
So
> > I try and store the soap object which is SOAP::RPC::Driver type.
> >
> > session[:soap] = soap
> >
> > and I get TypeError (singleton can''t be dumped):
> > C:/ruby/lib/ruby/1.8/pstore.rb:348:in `dump''
> > C:/ruby/lib/ruby/1.8/pstore.rb:348:in `dump''
> > C:/ruby/lib/ruby/1.8/pstore.rb:326:in `transaction''
> > C:/ruby/lib/ruby/1.8/cgi/session/pstore.rb:90:in `update''
> > C:/ruby/lib/ruby/1.8/cgi/session/pstore.rb:97:in `close''
> > C:/ruby/lib/ruby/1.8/cgi/session.rb:330:in `close''
> > C:/ruby/lib/ruby/gems/1.8/gems/actionpack-
> > 1.12.1/lib/action_controller/base.rb:984:in `close_session''
> >
> > Now ofcourse I realize that RPC Driver has some singleton object or
> > anonymous class/method which can''t be serialized hence the
TypeError. My
> > question is what can I do to improve the performance and reduce the
> > overhead of creating new RPC Driver objects on each request.
> >
> >
> > Thanks
> > -daya
> >
> >
> >
> >
------------------------------------------------------------------------
> >
> > _______________________________________________
> > Rails mailing list
> > Rails@lists.rubyonrails.org
> > http://lists.rubyonrails.org/mailman/listinfo/rails
>
> You don''t store the driver itself in the session but in global
singleton
> objects. That''s the approach I used not long time ago for exactly
this
> kind of problem.
>
> I just had someting like this in my model class
>   if @@driver.nil?
>     @@driver = SoapWsdlDriver.new
>   end
>   @@driver.customWebServiceCall
>
>
>
> --
>   Ola Bini (http://ola-bini.blogspot.com)
>   JvYAML, RbYAML, JRuby and Jatha contributor
>   System Developer, Karolinska Institutet (http://www.ki.se)
>   OLogix Consulting (http://www.ologix.com)
>
>   "Yields falsehood when quined" yields falsehood when quined.
>
>
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
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linux user

2006-Aug-07 15:45 UTC

head link

[Rails] Store SOAP::RPC::Driver in user session throws TypeError

On 8/7/06, linux user <fanoflinux@gmail.com>
wrote:>
> Ola, this is a Good idea but can it give rise race conditions?? or are
> there anyother implications which might be painful to debug/fix in the long
> run?
>
>
> On 8/7/06, Ola Bini <ola.bini@ki.se> wrote:
> >
> > linux user wrote:
> > > Hi All
> > >
> > > I have a
> > > requirement to consume a 3rd party web service from my Rails
> > application. I am doing this
> > > in my action
> > >
> > > require ''soap/wsdlDriver''
> > > factory = SOAP::WSDLDriverFactory.new(TRANSIDIOM_WSDL_URL)
> > > soap = factory.create_rpc_driver
> > >
soap.wiredump_file_base="#{RAILS_ROOT}/log/transidiom.log"
> > >
> > > param = %(<Request
> > >
name="com.wm.ccv.rpgrouter.seagull.CustomerProfileResCom">
<Input>
> > > <CompanyCode>110</CompanyCode>
<CustomerNumber>2442</CustomerNumber>
> > > <UserName>ccvdev2</UserName>
<Password>ccvdev2</Password>
> > > <LibrarySuffix>ORC</LibrarySuffix>
<targetHost>wmasprod</targetHost>
> > > </Input> </Request>)
> > >
> > > result = soap..retrieveCustomerData(param)
> > >
> > > I get the expected result, but the real problem is performance
since I
> >
> > > have to re-create the rpc-driver to the same service on each
request.
> > So
> > > I try and store the soap object which is SOAP::RPC::Driver type.
> > >
> > > session[:soap] = soap
> > >
> > > and I get TypeError (singleton can''t be dumped):
> > > C:/ruby/lib/ruby/1.8/pstore.rb:348:in `dump''
> > > C:/ruby/lib/ruby/1.8/pstore.rb:348:in `dump''
> > > C:/ruby/lib/ruby/1.8/pstore.rb:326:in `transaction''
> > > C:/ruby/lib/ruby/1.8/cgi/session/pstore.rb:90:in
`update''
> > > C:/ruby/lib/ruby/1.8/cgi/session/pstore.rb:97:in `close''
> > > C:/ruby/lib/ruby/1.8/cgi/session.rb:330:in `close''
> > > C:/ruby/lib/ruby/gems/1.8/gems/actionpack-
> > > 1.12.1/lib/action_controller/base.rb:984:in
`close_session''
> > >
> > > Now ofcourse I realize that RPC Driver has some singleton object
or
> > > anonymous class/method which can''t be serialized hence
the TypeError.
> > My
> > > question is what can I do to improve the performance and reduce
the
> > > overhead of creating new RPC Driver objects on each request.
> > >
> > >
> > > Thanks
> > > -daya
> > >
> > >
> > >
> > >
> >
------------------------------------------------------------------------
> > >
> > > _______________________________________________
> > > Rails mailing list
> > > Rails@lists.rubyonrails.org
> > > http://lists.rubyonrails.org/mailman/listinfo/rails
> >
> > You don''t store the driver itself in the session but in
global singleton
> > objects. That''s the approach I used not long time ago for
exactly this
> > kind of problem.
> >
> > I just had someting like this in my model class
> >   if @@driver.nil?
> >     @@driver = SoapWsdlDriver.new
> >   end
> >   @@driver.customWebServiceCall
> >
> >
> >
> > --
> >   Ola Bini ( http://ola-bini.blogspot.com)
> >   JvYAML, RbYAML, JRuby and Jatha contributor
> >   System Developer, Karolinska Institutet (http://www.ki.se)
> >   OLogix Consulting ( http://www.ologix.com)
> >
> >   "Yields falsehood when quined" yields falsehood when
quined.
> >
> >
> > _______________________________________________
> > Rails mailing list
> > Rails@lists.rubyonrails.org
> > http://lists.rubyonrails.org/mailman/listinfo/rails
> >
>
>I have put the similar code in my ApplicationController .... here is the
code

class ApplicationController < ActionController::Base

require ''soap/wsdlDriver''
factory = SOAP::WSDLDriverFactory.new(TRANSIDIOM_WSDL_URL)
@@soap = factory.create_rpc_driver
@@soap.wiredump_file_base="#{RAILS_ROOT}/log/transidiom.log"

def ......my actions....

I am in Development environment and the problem is that @@soap which should
be initialized only once (at class instantiation time) is initialized on
every request (I checkd the object_id and they are different on each
request). Being a newbie my guess is that atleast in development env there
is a new instance of the controller created on every request. So my question
is in Production env is there only one instance of the controller to serve
all requests or is there a new instance of controller created on every
request?

thanks in advance
-daya
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Ola Bini

2006-Aug-07 17:22 UTC

head link

[Rails] Store SOAP::RPC::Driver in user session throws TypeError

linux user wrote:> Ola, this is a Good idea but can it give rise race conditions?? or are 
> there anyother implications which might be painful to debug/fix in the 
> long run?
Not that I know of. And there''s no race condition involved if you
don''t
have any trouble with having more than one reference to the Driver 
floating around, which shouldn''t be a problem.

-- 
  Ola Bini (http://ola-bini.blogspot.com)
  JvYAML, RbYAML, JRuby and Jatha contributor
  System Developer, Karolinska Institutet (http://www.ki.se)
  OLogix Consulting (http://www.ologix.com)

  "Yields falsehood when quined" yields falsehood when quined.

linux user

2006-Aug-08 13:54 UTC

head link

[Rails] Store SOAP::RPC::Driver in user session throws TypeError

I know it is very difficult to simulate and identify a race condition. But
this is what I think may happen if I use class variable or even global
variable to store SOAP::RPC::Driver object.

In production each controller is loaded only once which I assume means there
is only one instance of controller serving multiple requests. Now lets
assume that all the parameters needed to make the web service call are local
to the action (method), which means these parameters are immune from race
conditions since the are on the thread stack and each thread is unique for
each request. But the class variable or global variable is shared across
multiple requests, now imagine the same class variable or global variable
accessed in different controllers or different actions of same controller.
Hence there is a potential that the result of a webservice call may get
mixed up, depending on who gets the returned value first.

I may completely wrong here since I don''t know about the inner working
of
the CGI/FCGI/Rails request handling. Can anyone please enlighten me or tell
me if my fears are misplaced?

TIA

-daya

On 8/7/06, Ola Bini <ola.bini@ki.se> wrote:>
> linux user wrote:
> > Ola, this is a Good idea but can it give rise race conditions?? or are
> > there anyother implications which might be painful to debug/fix in the
> > long run?
>
> Not that I know of. And there''s no race condition involved if you
don''t
> have any trouble with having more than one reference to the Driver
> floating around, which shouldn''t be a problem.
>
> --
>   Ola Bini (http://ola-bini.blogspot.com)
>   JvYAML, RbYAML, JRuby and Jatha contributor
>   System Developer, Karolinska Institutet (http://www.ki.se)
>   OLogix Consulting (http://www.ologix.com)
>
>   "Yields falsehood when quined" yields falsehood when quined.
>
>
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
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