// Merge merges the given delta into the existing one.
func (d *Delta) Merge(n *Delta) {
oadd := toSet(d.Additions)
odel := toSet(d.Deletions)
nadd := toSet(n.Additions)
ndel := toSet(n.Deletions)
// First remove new deletions from old adds and vice versa
fadd := set.Difference(oadd, ndel)
fdel := set.Difference(odel, nadd)
// Now add new adds and deletions
fadd = set.Union(fadd, nadd)
fdel = set.Union(fdel, ndel)
d.Additions = toStrings(fadd)
d.Deletions = toStrings(fdel)
}
// a + b
func scpUnion(a, b []int) []int {
sa := setFromIntSlice(a)
sb := setFromIntSlice(b)
sc := set.Union(sa, sb)
c := set.IntSlice(sc)
orderScp(c)
return c
}
// calculateActive calculates the active sites for the given configsets and
// stores them in the active property.
func (cs *configsets) calculateActive() {
cs.active = set.Difference(set.Union(cs.cloud, cs.add), cs.del)
cs.activeList = toStrings(cs.active)
}