Adapter: Memory

fabula_memory -- a simple in-memory temporal graph. Linear-scan queries. Suitable for testing and small graphs.

Crate: fabula-memory

MemGraph

An in-memory temporal graph storing edges as (source, label, target, interval) tuples.

use fabula_memory::{MemGraph, MemValue};

let mut g = MemGraph::new();
g.add_str("ev1", "type", "arrival", 1);
g.add_ref("ev1", "actor", "alice", 1);
g.add_num("ev1", "severity", 3.5, 1);
g.set_time(10);

DataSource type mapping

Associated type	Concrete type
N	String
L	String
V	MemValue
T	i64

Methods

MemGraph::new

Creates a new empty graph with current_time = 0.

pub fn new() -> Self

Returns: MemGraph

---

set_time

Sets the current time.

pub fn set_time(&mut self, t: i64)

Parameter	Type	Required	Default	Description
t	i64	yes	--	The new current time.

---

add_edge

Adds an edge with an open-ended interval starting at start.

pub fn add_edge(&mut self, source: &str, label: &str, target: MemValue, start: i64)

Parameter	Type	Required	Default	Description
source	&str	yes	--	Source node ID.
label	&str	yes	--	Edge label.
target	MemValue	yes	--	Target value.
start	i64	yes	--	Interval start time.

---

add_edge_bounded

Adds an edge with a bounded interval [start, end).

pub fn add_edge_bounded(
    &mut self,
    source: &str,
    label: &str,
    target: MemValue,
    start: i64,
    end: i64,
)

Parameter	Type	Required	Default	Description
source	&str	yes	--	Source node ID.
label	&str	yes	--	Edge label.
target	MemValue	yes	--	Target value.
start	i64	yes	--	Interval start time.
end	i64	yes	--	Interval end time (exclusive).

---

add_ref

Convenience: adds a node-to-node edge with an open-ended interval.

pub fn add_ref(&mut self, source: &str, label: &str, target_node: &str, start: i64)

Parameter	Type	Required	Default	Description
source	&str	yes	--	Source node ID.
label	&str	yes	--	Edge label.
target_node	&str	yes	--	Target node ID. Stored as MemValue::Node.
start	i64	yes	--	Interval start time.

---

add_str

Convenience: adds a node-to-string edge with an open-ended interval.

pub fn add_str(&mut self, source: &str, label: &str, value: &str, start: i64)

Parameter	Type	Required	Default	Description
source	&str	yes	--	Source node ID.
label	&str	yes	--	Edge label.
value	&str	yes	--	String value. Stored as MemValue::Str.
start	i64	yes	--	Interval start time.

---

add_num

Convenience: adds a node-to-number edge with an open-ended interval.

pub fn add_num(&mut self, source: &str, label: &str, value: f64, start: i64)

Parameter	Type	Required	Default	Description
source	&str	yes	--	Source node ID.
label	&str	yes	--	Edge label.
value	f64	yes	--	Numeric value. Stored as MemValue::Num.
start	i64	yes	--	Interval start time.

---

edge_count

Returns the total number of edges in the graph.

pub fn edge_count(&self) -> usize

Returns: usize

---

Trait implementations

Trait	Notes
Default	Equivalent to MemGraph::new().
DataSource	Linear scan over all edges for all query methods.

---

MemValue

A value in the in-memory graph.

pub enum MemValue {
    Node(String),
    Str(String),
    Num(f64),
    Bool(bool),
}

Variant	Description
Node(String)	Reference to another node. value_as_node returns Some.
Str(String)	String literal.
Num(f64)	Numeric value.
Bool(bool)	Boolean value.

Trait implementations

Trait	Notes
Debug	Derived.
Clone	Derived.
PartialEq	Derived.
PartialOrd	Derived.
Display	Node formats as @id, Str as "value", Num and Bool as their values.