When they have the same behavior (i.e. when they are bisimilar). Cheers
Steve T On 6 Nov 2005, at 09:16, Jan Algermissen wrote: > Question: > > what constitutes identity in SOA? When can a client consider two > services to be identical? > > - when they have the same address? > > - when they have the same type (as in myService ---isInstanceOf---> > ShoeOrderProcessor)? > > - when they have the same description? > > - unspecified; every SOA style software system must define identity > for itself > > > Jan > > > > > > > > On Nov 6, 2005, at 2:21 AM, JP Morgenthal wrote: > > > > > Here's what I propose: > > > > A) Loose-coupling - every service is atomic, self-describing, > > accessible, declarative, stateless and composite > > B) Contracted - All services in an SOA are represented by a > contract > > that describes its inputs, outputs, access policies, QoS > > requirements and > > error handling procedures > > C) Manageable - all services can be individually managed or > managed > > as a group > > D) Versioned - multiple versions of the same service should > be able > > to co-exist to maintain backward compatibility in a changing > > environment > > E) Discoverable - services should be able to be discoverable > at time > > of execution. > > F) Addressable - A service should be able to be uniquely > identified > > in a network > > G) Distributed - Services in an SOA are separated by > geographic and > > machine boundaries and, therefore, must be good netizen > > applications. That > > is, they must be developed with the ability to recover from loss of > > communications. > > H) Point-to-Point - At any point in time one consumer uses > one and > > only one producer > > > > ------------------------------------ > > Avorcor, Inc. > > JP Morgenthal > > Managing Partner > > [EMAIL PROTECTED] > > 12110 Sunset Hills Road, Suite 450 > > Reston, VA 20190 > > tel: (703) 648-1520 > > fax: (703) 648-1523 > > mobile: (703) 554-5301 > > ------------------------------------ > > > > -----Original Message----- > > From: [email protected] > > [mailto:[EMAIL PROTECTED] On Behalf > > Of Jan > > Algermissen > > Sent: Saturday, November 05, 2005 9:03 AM > > To: [email protected] > > Subject: Re: [service-orientated-architecture] Re: request for > > pointers to > > relevant information/documentation about SOA/SOC > > > > > >>> > >>> documents/publications related to SOA, starting from the basic > >>> principles to more complicated stuff. > > > > I know this has propably been stressed too much, but simply cannot > > resist :o) > > > > > > > > What are the basic principles of SOA? > > > > <duck/> > > > > Jan > > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > ------------------------ Yahoo! Groups Sponsor -------------------- > > ~--> > > Get Bzzzy! (real tools to help you find a job). Welcome to the > > Sweet Life. > > http://us.click.yahoo.com/A77XvD/vlQLAA/TtwFAA/NhFolB/TM > > -------------------------------------------------------------------- > > ~-> > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > _______________________________________________________________________ > _ > _______________ > Jan Algermissen, Consultant & Programmer > http://jalgermissen.com > Tugboat Consulting, 'Applying Web technology to enterprise IT' > http://www.tugboat.de > > > > > > > > > > SPONSORED LINKS > Computer monitoring software > Computer and internet software > Free computer monitoring software > > YAHOO! GROUPS LINKS > > ▪ Visit your group "service-orientated-architecture" on the web. > > ▪ To unsubscribe from this group, send an email to: > [EMAIL PROTECTED] > > ▪ Your use of Yahoo! Groups is subject to the Yahoo! Terms of > Service. > > ------------------------ Yahoo! Groups Sponsor --------------------~--> Fair play? Video games influencing politics. Click and talk back! http://us.click.yahoo.com/T8sf5C/tzNLAA/TtwFAA/NhFolB/TM --------------------------------------------------------------------~-> Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/service-orientated-architecture/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
