Struct JournalSnapshot 

pub struct JournalSnapshot {
    pub epoch: Option<JournalEpoch>,
    pub views: HashMap<String, PersistedViewJournal>,
}

The retained tape for every view, carried in the snapshot payload.

ponytail: this rides inside the existing whole-state snapshot rather than its own segment files. That buys the snapshot’s consistency cut for free — the tape and the entity cache are dumped under one barrier, so a restore can never leave the cache ahead of the tape — at the cost of rewriting the retained tape on every snapshot. Retention is bounded, so the cost is bounded too; if a deployment raises the bounds far enough that whole-blob rewrites hurt, the upgrade path is append-only segment objects alongside the snapshot.

Fields

epoch: Option<JournalEpoch>

Absent in snapshots written before cursors carried an epoch; such a tape is discarded on restore rather than adopted under a new epoch.

views: HashMap<String, PersistedViewJournal>

Trait Implementations

impl Clone for JournalSnapshot

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for JournalSnapshot

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for JournalSnapshot

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for JournalSnapshot

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for JournalSnapshot

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.