[kepler-dev] [kepler-users] question about kepler

dejw dejw at man.poznan.pl
Fri Jul 18 11:07:22 PDT 2008

Hi Paul,

it will be open-source? can I download the current code (svn, cvs?) 
install it and evaluate or something like this? when exectly do you plan 
to finish it?


Paul Allen wrote:
> Yes, we are working on two things that might be of general interest to 
> the Kepler community:
> 1) a web-based front-end to a myexperiment.org like into which you can 
> upload and execute workflows
> 2) a scalable back-end workflow execution framework to run workflows 
> at the request of web site users
> We are half-way through a development cycle at the end of which I 
> expect to have a stable demo site.
> -Paul
> Matthew Jones wrote:
>> Hi,
>> The actor repository allows you to upload an actor along with its 
>> MoML document and documentation.  The actor is stored in a Metacat 
>> server (http://knb.ecoinformatics.org/software/metacat) and the 
>> documentation is indexed to enable searching the repository through a 
>> web-based interface.  The repository can also be searched from within 
>> the Kepler application to locate remote actors of interest.  Metacat 
>> uses LDAP as its directory server to authenticate users.  Metacat 
>> supports fine grained, role-based access control of the objects it 
>> stores, but we currently are only supporting public/private access 
>> levels to simplify the process of uploading actors.  This could be 
>> reconsidered if there is a use case for more access levels.
>> Kepler communicates with Metacat using the EarthGrid web services 
>> interface. Any server that supports the appropriate web services 
>> interface could technically be used as an actor repository within 
>> Kepler. Metacat is one such server, and there may be others that 
>> would be candidates.
>> You can indeed deploy a version of metacat at your institution and 
>> use it for your actor repository by configuring the Kepler client to 
>> point at the new repository.
>> Kepler automatically prompts a person to login when they attempt to 
>> perform an operation requiring authentication, such as uploading an 
>> actor to the repository.  There is also a Login menu that allows 
>> someone to login at any time.
>> In terms of web-based UIs, there are several efforts.  Hydrant is 
>> indeed an excellent example, but others are also developing systems.  
>> The GEON project has  been running Kepler in the GEON portal 
>> successfully for several years, and Paul Allen at the Cornell 
>> Laboratory of Ornithology is developing an interface for biodiversity 
>> research.  The interest in this topic is significant, and so we will 
>> probably be forming a working group to improve Kepler's ability to be 
>> run in a portal environment.
>> Regards,
>> Matt
>> P.S. Please do not cross-post to kepler-dev and kepler-users -- pick 
>> the appropriate list for your question -- most developers are on both 
>> lists.
>> dejw wrote:
>>> Hi Jianwu again,
>>> I want to ask more about this below:
>>>>> 3. Actor repository - I understand that it is possible to have one 
>>>>> common actor repository for some organization? Kepler uses LDAP 
>>>>> for it? Are there some access rights for actors or something like 
>>>>> this? Is it possible to grant some roles to users when LDAP 
>>>>> authentication is used? Is it possible to require login while 
>>>>> starting Kepler?
>>>>      You can find the current actor repository at 
>>>> http://library.kepler-project.org/kepler/. Yet it is not widely 
>>>> used currently. We are trying implement more comprehensive actor 
>>>> repository mechanism.
>>> 1. So you use LDAP server to store actors? or something else?
>>> 2. How about access rights and user roles as regard access to actors 
>>> in such repository?
>>> 3. I understand I can deploy such repository inside some 
>>> organization and configure kepler to use it?
>>> 4. Can I set kepler to require login before start editor? to 
>>> recognize user somehow?
>>> Dawid
>>> ------------------------------------------------------------------------ 
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>>> Kepler-users at ecoinformatics.org
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