HighFile-scopeJava Plug & play

Use non-blocking patterns for async operations

Prefer thenCompose/thenCombine over blocking get/join; propagate async results end-to-end.

Why this matters

Avoids thread starvation and improves scalability.

Side-by-side examples engineers can pattern-match during review.

Avoid

var data = fetch().get(); // blocks

Prefer

return fetch().thenCompose(this::enrich).thenApply(this::ok);

Bad

future.get()

Good

future.thenCompose(f)

From the same buckets as this rule.

Critical
Avoid Blocking Calls to Async Methods
Blocking async methods with `.Result` or `.Wait()` can cause deadlocks and prevent efficient asynchronous execution. Use `await` instead for proper async behavior.
concurrency-safetyperformance-efficiency
Critical
Do Not Call `wait()` When Holding Multiple Locks
Ensure that `wait()` is not called while holding multiple locks to prevent deadlocks.
concurrency-safety
High
Avoid Using Mutable Global Variables
Identify global variables that are mutable (e.g., lists, dictionaries). Global mutable state can cause unpredictable behavior. Recommend using local variables or encapsulating state in a class.
concurrency-safetymaintainability+1