Method get_graph

graphlite/src/storage/storage_manager.rs:153–205

Get a graph by name Checks cache first, then memory store, then persistent storage

(&self, name: &str)

    /// Get a graph by name
    /// Checks cache first, then memory store, then persistent storage
    pub fn get_graph(&self, name: &str) -> Result<Option<GraphCache>, StorageError> {
        debug!("Getting graph '{}' from storage manager", name);

        // 1. Check local cache first
        match self.cache.get_graph(name) {
            Ok(Some(graph)) => {
                debug!("Graph '{}' found in local cache", name);
                return Ok(Some(graph));
            }
            Ok(None) => {
                debug!("Graph '{}' not found in local cache", name);
            }
            Err(e) => {
                error!("Error checking cache for graph '{}': {}", name, e);
                return Err(e);
            }
        }

        // No fallback logic - use exact names for consistency

        // 2. Check memory store if available
        if let Some(_memory_store) = &self.memory_store {
            debug!("Memory store not yet implemented for graph '{}'", name);
        }

        // 3. Check persistent disk storage if available
        debug!(
            "Graph '{}' not in memory, checking persistent storage",
            name
        );

        if let Some(persistent_store) = &self.persistent_store {
            if let Some(driver) = &self.storage_driver {
                match persistent_store.load_graph_by_path(driver.as_ref().as_ref(), name) {
                    Ok(graph) => {
                        debug!("Graph '{}' loaded from persistent storage", name);

                        // Add to cache for future access
                        self.cache.add_graph(name.to_string(), graph.clone())?;
                        return Ok(Some(graph));
                    }
                    Err(e) => {
                        debug!(
                            "Failed to load graph '{}' from persistent storage: {}",
                            name, e
                        );
                    }
                }
            }
        }

        Ok(None)
    }

    /// Save a graph
    /// Updates cache, memory store (if available), and persistent storage