System design URL shortener: Spring Boot 4.1.1, base62 ids, Redis cache-aside, Redis Lua token bucket, 24 tests and live transcripts

2026-10-22 08:13:35 +00:00
commit aa61ed8786
51 changed files with 1717 additions and 0 deletions
@@ -0,0 +1,15 @@
+code = 7qqChen
+$ redis-cli EXISTS url:7qqChen            # before the first redirect
+0
+--- after 1st redirect (cache miss, database read, cache filled)
+$ redis-cli GET url:7qqChen
+https://example.com/cache-demo
+$ redis-cli TTL url:7qqChen
+3600
+cache hits +0, misses +1
+--- after 9 more redirects
+cache hits +9, misses +1
+$ redis-cli GET clicks:7qqChen
+10
+$ curl -s http://127.0.0.1:8080/api/v1/urls/7qqChen/stats
+{"code":"7qqChen","longUrl":"https://example.com/cache-demo","clicks":10,...