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ContextWindowManager

aster::context::window_manager

Struct ContextWindowManager 

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pub struct ContextWindowManager { /* private fields */ }
Expand description

Context Window Manager for tracking and managing token usage.

Tracks cumulative token usage across API calls and provides utilities for calculating available context space.

Implementations§

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impl ContextWindowManager

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pub fn new(model_id: &str) -> Self

Create a new ContextWindowManager for the specified model.

§Arguments
  • model_id - The model identifier (e.g., “claude-3-5-sonnet-20241022”)
§Example
use aster::context::window_manager::ContextWindowManager;

let manager = ContextWindowManager::new("claude-3-5-sonnet-20241022");
assert_eq!(manager.get_context_window_size(), 200_000);
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pub fn get_model_context_window(model_id: &str) -> usize

Get the context window size for a model.

Returns the known context window size for the model, or the default if the model is not recognized.

§Arguments
  • model_id - The model identifier
§Returns

Context window size in tokens

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pub fn calculate_available_context(model_id: &str) -> usize

Calculate available context space for input.

Applies the reservation strategy:

  • For context ≤50k: reserve 20% for output
  • For context >50k: reserve fixed 50k for output
§Arguments
  • model_id - The model identifier
§Returns

Available tokens for input

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pub fn calculate_output_space(model_id: &str) -> usize

Calculate output space reservation for a model.

§Arguments
  • model_id - The model identifier
§Returns

Tokens reserved for output

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pub fn update_model(&mut self, model_id: &str)

Update the model and recalculate context window size.

§Arguments
  • model_id - The new model identifier
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pub fn record_usage(&mut self, usage: TokenUsage)

Record token usage from an API call.

Updates cumulative totals and stores the current usage.

§Arguments
  • usage - Token usage from the API call
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pub fn get_usage_percentage(&self) -> f64

Get the current context usage percentage.

Calculates usage based on total input tokens relative to context window.

§Returns

Usage percentage (0.0 - 100.0)

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pub fn is_near_limit(&self, threshold: f64) -> bool

Check if context usage is near the limit.

§Arguments
  • threshold - Percentage threshold (0.0 - 100.0)
§Returns

true if usage exceeds the threshold

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pub fn get_context_window_size(&self) -> usize

Get the context window size.

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pub fn get_total_input_tokens(&self) -> usize

Get total input tokens consumed.

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pub fn get_total_output_tokens(&self) -> usize

Get total output tokens generated.

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pub fn get_available_context(&self) -> usize

Get available context space for the current model.

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pub fn get_output_space(&self) -> usize

Get output space reservation for the current model.

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pub fn get_model_id(&self) -> &str

Get the current model ID.

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pub fn get_current_usage(&self) -> Option<&TokenUsage>

Get the most recent API call usage.

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pub fn get_stats(&self) -> ContextWindowStats

Get context window statistics.

§Returns

Statistics about context window usage

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pub fn get_cache_stats(&self) -> CacheStats

Get cache statistics.

§Returns

Statistics about cache usage

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pub fn reset(&mut self)

Reset all statistics.

Clears cumulative token counts and current usage.

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pub fn get_remaining_tokens(&self) -> usize

Get remaining available tokens.

Calculates how many more input tokens can be used before reaching the available context limit.

§Returns

Remaining available tokens (0 if limit exceeded)

Trait Implementations§

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impl Clone for ContextWindowManager

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fn clone(&self) -> ContextWindowManager

Returns a duplicate of the value. Read more
1.0.0 · Source§

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

Performs copy-assignment from source. Read more
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impl Debug for ContextWindowManager

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

Formats the value using the given formatter. Read more
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impl Default for ContextWindowManager

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fn default() -> Self

Returns the “default value” for a type. Read more

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