Agreement Phase Clause Samples
Agreement Phase. Pi starts the agreement phase by broadcasting a нelp_req message (line 19) only if it has not previously acquired a certificate (due to the check at line 18). If ▇▇ receives a нelp_req message in round 2 of the agreement phase (line 21), Pi replies via a нelp_reply message (line 22) which includes (1) an acquired certificate (if any), and (2) a partial signature of Pi ’s proposal to allow for a (potential) creation of a specific certificate. Pi executes the logic of rounds 3 and 4 only if it has not previously acquired a certificate (due to the checks at lines 24 and 34). In round 3, Pi aims to acquire a certificate: • If Pi receives a valid certificate in a нelp_reply message (line 25), Pi acquires the certificate (line 26). • Otherwise, Pi checks if it has received the same value from t+1 processes via нelp_reply messages (line 27). If so, Pi constructs a specific certificate by combining the received t + 1 partial signatures into a (t + 1)-combined threshold signature (line 29). • If neither of previous cases occurs, Pi aims to build a general certificate. To this end, Pi broadcasts a illow-iny message (line 32) which carries a partial signature of the “allow any” string. In round 4, Pi either receives a formed certificate from another process (line 35) or con- structs a general certificate (line 39). At the end of round 4, ▇▇ proposes the acquired value- certificate pair to EBA (line 40). Finally, when ▇▇ decides from EBA (line 41), it decides from stronc (line 42). Algorithm 1 stronc: Pseudocode (for process Pi) 1: Uses:
Agreement Phase. After removing the faulty processors, each fault-free processor can achieve agreement by exchanging its value with one another again.
Agreement Phase. After receiving an offer, supplier and customer may negotiate service properties and the pricing scheme. The parties agree on mutual commitments by the result of a (i) fixed price order, (ii) auction, (iii) tender, (vi) exchange, or (v) bilateral negotiation. Any pricing scheme is regarded as a type of price (e.g., metered-usage pricing).
1]. The SWAPS extension only comprises contents of agreements and therefore negotiations; hence the protocol compatibility is not altered. The WSLA specification does not include information about negotiation, though it is possible to negotiate the content of a WSLA beyond the scope of the specification. Regarding the agreement activity, WSLA and WS-Agreement target different objectives. WSLA has a more fixed structure, preferring standardisation over flexibility. As WS-Agreement leaves large parts undefined towards broader applicability, this may be regarded as lack of structure [9, p. 2]. The SWAPS extension of WS-Agreement is a hybrid of the former two approaches: towards a more structured approach, it includes structure characteristics of WSLA besides custom tags. Additionally, the semantic assignment mitigates ambiguity of agreement expressions. Agreements on performance constraints are clearly the strength of the approaches, since this has been one of the main design objectives.
Agreement Phase. Initialize lock := ∞, m := mP and k := 0. Repeat the following loop – At time (12k + 16) · ∆: Initiate ΠGBA on input m. – At time (12k + 20) · ∆: • Let (v, g) be the output of P . If lock = ∞ then: ∗ If g = 2, set lock := 1. ∗ If g = 1, then set m := v. ∗ If g = 0, then set m = ⊥. – At time (12k + 24) · ∆: • Initiate ΠGBA on input m. • Let (v, g) be the output of P . If lock = ∞ then: ∗ If g = 1, then set m := v. – At time (12k + 27) · ∆: • Multicast m. ∗ If g = 0, then set m = ⊥. • Set k := k + 1 and denote mj the message received from Pj . Let ℓ denote the output obtained from ΠLeader. • If lock = 0, P outputs m and terminates. • If lock = ∞ and m = ⊥, then P sets m := mℓ. • If lock = 1, then P sets lock := 0.