A Framework for Version-based Cooperation Control
نویسنده
چکیده
In~lgineaingenvirarmentsLhesu~oC~w~ is l basicfutmewhich is&ten nd addressed by the &sign of so-called non-stmdarddubue systems(NDBS). pint attempts IO support ccopcnticm were made by the defmition of nested trmssctions. design smsrctions. etc. which modify the t~ms~tiat’s inherent ACID-principle. Ob scrvmce of the ACID-principle guarantees the logical singk user mode md &l&an which encapsulates the wak of the vaicus users: this mode is the cut&my of teamwork and cooperation, i.e. the &signers of one team wuk in paralkl, use unreliabk data and they se aware of bxh these rams. Thus, we need l system which ccmtrols Ihe cooperation by keqing track of dti dependencies. ntba than a system simuluing single us.3 mode. llw use of unreliable d&u (belonging to one design object) is lured by the lcng duration of design pmcesscs. Accordingly, the objectn hmve to be mdc wasstble at spccial design states leading to versions of the objects, which provide different feahtres based on their desilpl state. ‘Ihere features re in getrem! a subset o( the fedures whiih should be provided by the final design object. Inbudocing these features (and means m detect and control them) into the DBMS gives us l noticm of consistency in terms of cmectness a compkreness ofdesitp objects, i.e. a design cbjea is coasistant ifit contains 1t least one version which provides all features speeifkd as the design goal. Furthermore. each subset of the features itmtizes a distinct level of coasistmcy. Thaeforr, cooperation takes place by providing md usin ob&t versions along with their features. i.e. at different consistency kvels. thence. -iax cxmtrol cm be focused on controlling object versions ad usage reltiions mncmg than. Thereby, obeying the consistency levels which me povided ad which are demanded. Using these consistency levels for conflict detection ad resolution leads to memiagful u1qxration calird. In this paper we introdua 8 version model as basis for the suppcrt of temnwork. Versions comprise the data belonging to one (compkx) design ob&t vatid at l paliculr design stak. Funhutuore, we iutmduce tbc notiou d fern sets whidt we use as a means to detect. achieve, and amtrot the consistency of d+ct versions. We demoastmte which functionality has to be added to the dubrre mmagemmt synem ia order to qpmt cobpr*ion.
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