Maintenance

Dependency Management

Version Pinning

toml

[dependencies]
opencv = "=0.88.0"  # Pin exact version
tokio = "1.0"       # Allow compatible updates

Security Updates

bash

# Check for security advisories
cargo audit
# Update dependencies
cargo update
# Check for outdated dependencies

cargo outdated Performance Optimization Memory Management

rust

use opencv::core::Mat;
fn optimize_memory_usage() {
    // Preallocate matrices
    let mut result = Mat::new_rows_cols_with_default(
        480, 640, 
        opencv::core::CV_8UC3, 
        opencv::core::Scalar::all(0.0)
    ).unwrap();
    // Reuse matrices where possible
    // Clear matrices when done
    result.release();
}

Threading Configuration

rust

use opencv::core;
use std::thread;
fn configure_threading() -> opencv::Result<()> {
    let cpu_count = thread::available_parallelism()?.get();
    let opencv_threads = (cpu_count / 2).max(1);
    core::set_num_threads(opencv_threads as i32)?;
    info!("Configured OpenCV to use {} threads", opencv_threads);
    Ok(())
}

Database and Cache Management

Result Caching

rust

use std::collections::HashMap;
use opencv::core::Mat;
struct ImageCache {
    cache: HashMap<String, Mat>,
    max_size: usize,
}
impl ImageCache {
    fn get_or_process<F>(&mut self, key: &str, processor: F) -> opencv::Result<Mat>
    where
        F: FnOnce() -> opencv::Result<Mat>,
    {
        if let Some(cached) = self.cache.get(key) {
            return Ok(cached.clone());
        }
        let result = processor()?;
        if self.cache.len() >= self.max_size {
            // Remove oldest entry
            if let Some(oldest_key) = self.cache.keys().next().cloned() {
                self.cache.remove(&oldest_key);
            }
        }
        self.cache.insert(key.to_string(), result.clone());
        Ok(result)
    }
}

Backup and Recovery

Data Backup Strategy

rust

use std::path::Path;
use opencv::imgcodecs;
fn backup_processed_images(source_dir: &Path, backup_dir: &Path) -> opencv::Result<()> {
    for entry in std::fs::read_dir(source_dir)? {
        let entry = entry?;
        let path = entry.path();
        if path.extension().map_or(false, |ext| {
            matches!(ext.to_str(), Some("jpg") | Some("png") | Some("bmp"))
        }) {
            let img = imgcodecs::imread(path.to_str().unwrap(), imgcodecs::IMREAD_COLOR)?;
            let backup_path = backup_dir.join(path.file_name().unwrap());
            imgcodecs::imwrite(backup_path.to_str().unwrap(), &img, &Vec::new())?;
        }
    }
    Ok(())
}