Struct TemplateCompactor 

pub struct TemplateCompactor { /* private fields */ }

A zero-dependency reference Compactor that produces a textual rollup of evicted messages without calling an LLM.

The artifact is a single Message::System whose body concatenates a header, the previous summary (if any), and the textual content of each newly-evicted message. It is intentionally simple: useful as a default for tests and examples, and as a placeholder before wiring a real summarising LLM through a custom Compactor implementation.

Bounding the summary

By default the summary grows monotonically: every compaction pass embeds the previous summary verbatim and appends newly-evicted lines. Long-running conversations should call Self::with_max_bytes to cap the rolled-up text. When the cap is exceeded, the oldest portion of the body (after the header) is dropped at a UTF-8 boundary and replaced with a "[…truncated…]" marker, preserving the most recent context.

Example

use rig_memory::TemplateCompactor;

// Default header is "[Conversation summary so far]", unbounded.
let _compactor = TemplateCompactor::new();

// Custom header plus a 4 KiB cap for use with token-budgeted policies.
let _bounded = TemplateCompactor::with_header("Earlier context")
    .with_max_bytes(4 * 1024);

Implementations

impl TemplateCompactor

pub fn new() -> Self

Create a TemplateCompactor with the default header "[Conversation summary so far]" and no size cap.

pub fn with_header(header: impl Into<String>) -> Self

Create a TemplateCompactor with a custom header line and no size cap.

pub fn with_max_bytes(self, max_bytes: usize) -> Self

Cap the rolled-up summary at max_bytes bytes (UTF-8). When the assembled body exceeds the cap, the oldest portion after the header is dropped at a char boundary and replaced with a "[…truncated…]" marker.

max_bytes of 0 disables truncation (equivalent to the default unbounded behaviour). The header line plus the marker are always preserved even if they exceed the cap.

Trait Implementations

impl Clone for TemplateCompactor

fn clone(&self) -> TemplateCompactor

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Compactor for TemplateCompactor

type Artifact = TextSummary

The summary value produced by Compactor::compact.

fn compact<'a>( &'a self, _conversation_id: &'a str, evicted: &'a [Message], carry_over: Option<&'a Self::Artifact>, ) -> WasmBoxedFuture<'a, Result<Self::Artifact, MemoryError>>

Produce a summary artifact for evicted, optionally combining it with the previous summary in carry_over.

impl Debug for TemplateCompactor

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

Formats the value using the given formatter.

impl Default for TemplateCompactor

fn default() -> Self

Returns the “default value” for a type.