open-nomad/nomad/watch/watch.go

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package watch
// The watch package provides a means of describing a watch for a blocking
// query. It is exported so it may be shared between Nomad's RPC layer and
// the underlying state store.
// Item describes the scope of a watch. It is used to provide a uniform
// input for subscribe/unsubscribe and notification firing.
type Item struct {
Alloc string
AllocNode string
Eval string
Job string
Node string
Table string
}
// Items is a helper used to construct a set of watchItems. It deduplicates
// the items as they are added using map keys.
type Items map[Item]struct{}
func NewItems(items ...Item) Items {
wi := make(Items)
for _, item := range items {
wi.Add(item)
}
return wi
}
// Add adds an item to the watch set.
func (wi Items) Add(i Item) {
wi[i] = struct{}{}
}