Struct VersionedState 

pub struct VersionedState<T> { /* private fields */ }

Tracks versioned state for delta queries.

Implementations

impl<T: Clone> VersionedState<T>

pub fn new() -> Self

Create a new versioned state with no data.

pub fn from_data(data: Vec<T>) -> Self

Create from initial data at version 1.

pub fn version(&self) -> u64

Current version number.

pub fn last_modified(&self) -> DateTime<Utc>

Timestamp of last modification.

pub fn data(&self) -> &[T]

Read the full data slice.

pub fn add(&mut self, item: T)

Add a new item, incrementing the version.

pub fn update(&mut self, index: usize, item: T)

Update an item at the given index.

pub fn delete(&mut self, index: usize)

Mark an item as deleted (removes from data vec).

pub fn changes_since_version(&self, since_version: u64) -> DeltaResult<T>

Query changes since a given version.

Returns DeltaResult::Unchanged if there have been no changes, or DeltaResult::Changed with the affected items.

pub fn is_unchanged_since(&self, since_version: u64) -> bool

Check whether the state is unchanged since a given version.

Trait Implementations

impl<T: Clone> Clone for VersionedState<T>

fn clone(&self) -> VersionedState<T>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for VersionedState<T>

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

Formats the value using the given formatter.

impl<T: Clone> Default for VersionedState<T>

fn default() -> Self

Returns the “default value” for a type.

impl<'de, T> Deserialize<'de> for VersionedState<T>

where T: Deserialize<'de>,

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<T> Serialize for VersionedState<T>

where T: Serialize,

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

where __S: Serializer,

Serialize this value into the given Serde serializer.