Once a trigger constraint is violated, the adaptation is unavoidable.
A trigger constraint is a boolean formula in disjunctive normal form, c 1∧…∧c n.
This being fixed, the ASK team defined then two important properties for Adaptable-ASK: QoS.TR and SYS.cost, and based on them the following trigger constraint: (TR,geq,t) land (cost,textsf{min}, textsf{true}).
For instance, (QoS.p,>,100)∧ SYS.c,min,true)∧ FUN.s,eval,true) defines a trigger constraint that enacts an adaptation when the measure for the non-functional property p is not above 100, system specific property c is not the minimum (when compared to the same property of candidate configurations) and functional property s does not eval'uate to true.
However, customization in these systems is limited to the introduction of user-defined types, functions, triggers, constraints, indexing mechanisms, and predicates, etc.
From about the mid-1980's to the mid-1990's there was a flurry of research activity in the area of database triggers and constraints, seeing the development of numerous research proposals and prototypes.
Jasmine also provides a view facility for schema integration and a constraint management facility including integrity constraints, triggers, and rules.
ASP approach [12, 13] can provide such descriptive power, but currently it is still new in the field of planning, and it cannot directly handle numbers as shown in Case 4. In alot of cases, manipulation and reasoning with numbers are required, such as the case in volume control and triggers from numerical constraints.
The cavitation can release the plastic constraints and trigger mass plastic deformation of the matrix, leading to much improved fracture toughness.
Based on a comparison of essential figures of merit, namely vertex resolutions, event selection efficiencies, trigger performance and technical constraints, an updated baseline design is proposed.
