Method allocate

graphlite/src/exec/memory_budget.rs:107–126

ROADMAP v0.2.0 - Memory budget enforcement for large queries (see ROADMAP.md §1)

(&self, bytes: usize)

    /// ```
    #[allow(dead_code)] // ROADMAP v0.2.0 - Memory budget enforcement for large queries (see ROADMAP.md §1)
    pub fn allocate(&self, bytes: usize) -> Result<(), ExecutionError> {
        let current = self.allocated.fetch_add(bytes, Ordering::SeqCst);
        let new_total = current + bytes;

        // Update peak if necessary
        self.peak.fetch_max(new_total, Ordering::SeqCst);

        // Check if we exceeded the limit
        if new_total > self.limit {
            // Rollback allocation
            self.allocated.fetch_sub(bytes, Ordering::SeqCst);

            return Err(ExecutionError::MemoryLimitExceeded {
                limit: self.limit,
                requested: new_total,
            });
        }

        Ok(())
    }

    /// Try to allocate memory, returning false if budget exceeded
    ///