Hi Shankar,
Great thing to implement.
+1 for writing a wrapper.
Damitha
Uthaiyashankar wrote:
Hi,
Since apache is creating child processes using fork (in linux), only
possible option to share data between children is using an ipc method.
For example, creating Axis2_worker, conf_context and global pool in a
shared memory, and sharing between processes (using apr_shm, apr_rmm).
We can use global mutex to control the access of shared memory. An
example implementation is given in
http://people.apache.org/~sctemme/mod_example_ipc.c.
mod_ldap is also using a similar approach to cache and share data
between child processes.
However, to hide the low level details from service/module
implementers, we might have to write a wrapper to manage the shared
memory, growing/shrinking the shared memory according to the demand,
creating objects in shared memory, etc.
It is also possible to use apr_dbm/apr_memcache to share data, but
those are similar to using a database.
Any other thoughts or comments ??
Regards,
Uthaiyashankar.
Samisa Abeysinghe wrote:
FYI: This mail was in the user list.
I think we have to solve this mod_axis2 related problems, specially
for the benefit of the production users.
At a glance, it looks to me as if we can solve this by using either
apr_proc_mutex [1] or apr_global_mutex [2].
At a glance, it looks to me as if using apr_global_mutex and locking
the stuff could be the solution.
Thoughts please...
[1] http://apr.apache.org/docs/apr/0.9/apr__proc__mutex_8h.html
[2] http://apr.apache.org/docs/apr/0.9/apr__global__mutex_8h.html
Thanks,
Samisa...
-------- Original Message --------
Subject: Re: Urgent: Specifying scope in Axis2c
Date: Fri, 12 Oct 2007 08:59:17 +0600
From: Samisa Abeysinghe <[EMAIL PROTECTED]>
Reply-To: Apache AXIS C User List <[EMAIL PROTECTED]>
To: Apache AXIS C User List <[EMAIL PROTECTED]>
References:
<[EMAIL PROTECTED]>
Subra A Narayanan wrote:
Hello everyone,
I have run in to an issue which I can't seem to figure out. In my
init method in the service skeleton I call the initialization
routine of one of the libraries that my web service uses. I notice
in my logs that the library initialization function is being called
8 times. This corresponds to the number of apache processes that are
running.
This is a problem yet to be solved in Axis2/C. See
http://damithakumarage.wordpress.com/2007/09/23/an-axis2-c-design-issue/.
This is a pending issue that needs to be fixed.
The workaround for the time being would be to use some persistent
storage to keep a flag and call the init routine based on the flag
value.
Samisa...
This is causing a lot of issues because I was under the impression
that my web service init function is called only once when the first
request comes in. My library sets up some resources which I want to
share among all processes. Can this be done?
In Axis2/Java there is a way to specify scope for the webservice
(request, session, application) in the services.xml file? can
something similar be done in Axis2/c? I took a look at the axis2c
code and saw that there is an enum called axis2_scope defined. Is it
used for the same purpose as in Axis2/Java?
Thanks for any help.
Subra
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