pub enum Revision {
Counter(u64),
Opaque(String),
}Expand description
Which version of a document a store handed back.
Two shapes, because stores answer this question in two genuinely different ways and flattening them would be a lie:
Counter etcd revisions, Consul indices, Vault KV versions ordered
Opaque ETags, object hashes, commit ids equal or notA Counter can be compared — a lower one is older, and installing it
over a higher one moves a configuration backwards. An Opaque can only
be compared for equality: an ETag carries no order at all, and
pretending it does would invent a fact the store never stated.
Variants§
Counter(u64)
A number the store increments. Higher is newer.
Opaque(String)
A token that only ever means “the same” or “not the same”.
Implementations§
Source§impl Revision
impl Revision
Sourcepub fn supersedes(&self, installed: Option<&Self>) -> bool
pub fn supersedes(&self, installed: Option<&Self>) -> bool
Whether this is a version the caller is not already serving.
installed is what is being served now. A Counter supersedes a
lower one; an Opaque supersedes anything it does not equal; and a
pair of different shapes supersedes, because a store that changed
how it answers is telling you its new answer.
Trait Implementations§
impl Eq for Revision
impl StructuralPartialEq for Revision
Auto Trait Implementations§
impl Freeze for Revision
impl RefUnwindSafe for Revision
impl Send for Revision
impl Sync for Revision
impl Unpin for Revision
impl UnsafeUnpin for Revision
impl UnwindSafe for Revision
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