What methods would you use to store system responses to speed up subsequent requests?

To accelerate subsequent requests, caching system responses can be implemented. Main methods:

• In-memory cache:

  • Use data structures like HashMap to store key-value pairs.
  • Fast access, but limited by RAM capacity.

• File caching:

  • Save responses to files on disk.
  • Suitable for large data, but access is slower.

• Using specialized cache systems:

  • Redis, Memcached — fast access, support for TTL (time to live).

• HTTP-level caching:

  • Use headers like Cache-Control, ETag for browser or proxy caching.

Example of a simple in-memory cache in Java:

import java.util.HashMap;

public class SimpleCache {
    private HashMap<String, String> cache = new HashMap<>();

    public void put(String key, String value) {
        cache.put(key, value);
    }

    public String get(String key) {
        return cache.get(key);
    }
}

It is important to consider cache update strategies and data lifetime.