On Mon, Jul 6, 2009 at 11:05 AM, Luciano Resende <[email protected]>wrote:
> On Mon, Jul 6, 2009 at 6:48 AM, Douglas Leite<[email protected]> wrote: > > Here are some updates from my project, (source code at [1]): > > > > 1) A new test scenario was developed: primary-backup with N backups. In > this > > scenario we have a server-client application, with N nodes on the server > > side. The first node to join on the server side becomes the primary > server, > > and the subsequent ones are the backups. The primary gets a request from > a > > client, and sends a reply to the client and a copy of it state to the > > backups. When the primary fails, the first backup on the queue becomes > the > > new server. On the other hand, when a backup fails, the primary simply > stop > > to send updates to it. > > > > This scenario was implemented using the guardian-model approach. > > What is a node here, is this the same concept of a SCA Node ? I guess so. Actually, each node is implemented as a component. Take a look at: http://svn.apache.org/repos/asf/tuscany/sandbox/dougsleite/guardian-model/src/main/resources/primaryNbackups.composite The nodes are implemented as components whose name are "Participant#". > > > > > > 2) A new tag was added to the recovery rules XML file: > > <affected_participants>. It allows specify in which participants the > > exception will be raised. For example: > > > > <participant match="*.BACKUP"> > > <throw_exception > > > class="org.apache.tuscany.sca.guardian.itests.primaryBackup.common.PrimaryFailedException" > > target_context="MAIN"> > > <affected_participants>FIRST</affected_participants> > > </throw_exception> > > </participant> > > > > With this rule, only the first backup on the backup queue will have a > > PrimaryFailedException raised in it's MAIN context. > > > > How is this configuration integrated with SCA and the composite file ? At this moment the two files are separated, and there is a reference on the composite file to the recovery rule XML file. I am using a property tag to link the two files: * <component name="GuardianGroup"> <implementation.java class="org.apache.tuscany.sca.guardian.GuardianGroupImpl"/> <property name="recovery_rules">src/main/resources/recoveryrules_nbackpus.xml</property> </component> * I do not know if it is the best design, but as a first design I think it is good. :) > > > > > > Thoughts? > > > > What are your plans to integrate this into the SCA Runtime ? It would > be really good to continue the design discussions we had earlier and > advance on the SCA/Tuscany Runtime integration discussion. I wouldn't > like to see this as a sandbox side project for much more time. > > > > > [1] > > > http://svn.apache.org/repos/asf/tuscany/sandbox/dougsleite/guardian-model/ > > > > -- > > Douglas Siqueira Leite > > Graduate student at University of Campinas (Unicamp), Brazil > > > > > > > > -- > Luciano Resende > Apache Tuscany, Apache PhotArk > http://people.apache.org/~lresende <http://people.apache.org/%7Elresende> > http://lresende.blogspot.com/ > -- Douglas Siqueira Leite Graduate student at University of Campinas (Unicamp), Brazil
