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Subject: Re: [soa-rm-ra] point of action
To draw another analogy for the point of action, I know your mind will be the point of action for processing this e-mail as you read the e-mail. The e-mail address and the english language is like a service interface. The SOA has many points of action, each point of action potentially affecting many other points of action. We can identify points of action in a SOA relevant to the reference architecture. One question we can ask is can we identify a point of action meaningful to the reference architecture that would not have a service interface? Danny --- Ken Laskey <klaskey@mitre.org> wrote: > The following are from my notes at the ftf > > Point of Action (poa) > > - Frank: anchoring mechanism for numerous > things, e.g. policy > enforcement, evaluating needs & capabilities > > - Ken: how does poa relate to service > interface? Frank: > service interface includes actions you can perform; > each instance of > use consists of performing action; actual action is > poa; interface > vs. poa is class vs. instance relationship; the > physical action is > the point of action > > - [Ken] Given a policy is a desire of one > participant and an > agreement as part of the execution context for > participants to abide > by that policy (i.e. the other participant(s) agree > to make that > policy theirs), the policy enforcement point becomes > the point of > action for enforcing the agreed-upon policy. > > - [Frank alternative] A policy is a constraint > that represents > the desire of a participant. A contract is a > constraint that > represents the agreed desires of two or more > participants. A [policy] > enforcement point is the point of action for > enforcing constraints > that represent either policies or contracts. > > > I've reread this and am still having problems > differentiating between > service interface and point of action. It appears > that poa is more > general because it is the location to which a user > would send a > command for action. If the receiver is a service, > then the poa would > seem to be the service interface. In the policy > example, if the > enforcement mechanism is accessed through a service, > the PEP could be > said to have a service interface. > > I still seem to be missing something. > > Ken > > --- > Ken Laskey > MITRE Corporation, M/S H305 phone: 703-983-7934 > 7515 Colshire Drive fax: > 703-983-1379 > McLean VA 22102-7508 > > > > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
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