velesdb-core 1.7.0

High-performance vector database engine written in Rust
Documentation 
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//! Collection statistics: analyze and cache collection stats.

use crate::{Error, Result};

use super::Database;

impl Database {
    /// Analyzes a collection, caches stats, and persists them to disk.
    ///
    /// # Errors
    ///
    /// Returns an error if the collection does not exist, analysis fails, or
    /// stats cannot be serialized and written to disk.
    #[allow(deprecated)]
    pub fn analyze_collection(
        &self,
        name: &str,
    ) -> Result<crate::collection::stats::CollectionStats> {
        let collection = self
            .get_collection(name)
            .ok_or_else(|| Error::CollectionNotFound(name.to_string()))?;
        let stats = collection.analyze()?;

        self.collection_stats
            .write()
            .insert(name.to_string(), stats.clone());

        let stats_path = self.data_dir.join(name).join("collection.stats.json");
        let serialized = serde_json::to_vec_pretty(&stats)
            .map_err(|e| Error::Serialization(format!("failed to serialize stats: {e}")))?;
        std::fs::write(&stats_path, serialized)?;

        Ok(stats)
    }

    /// Returns cached statistics when available, loading from disk if present.
    ///
    /// # Errors
    ///
    /// Returns an error if the on-disk stats file exists but cannot be read or
    /// deserialized.
    pub fn get_collection_stats(
        &self,
        name: &str,
    ) -> Result<Option<crate::collection::stats::CollectionStats>> {
        if let Some(stats) = self.collection_stats.read().get(name).cloned() {
            return Ok(Some(stats));
        }

        let stats_path = self.data_dir.join(name).join("collection.stats.json");
        if !stats_path.exists() {
            return Ok(None);
        }

        let bytes = std::fs::read(stats_path)?;
        let stats: crate::collection::stats::CollectionStats = serde_json::from_slice(&bytes)
            .map_err(|e| Error::Serialization(format!("failed to parse stats: {e}")))?;
        self.collection_stats
            .write()
            .insert(name.to_string(), stats.clone());
        Ok(Some(stats))
    }
}