hashbrown

    Stack<AuthenticationRequestHolder> cachedRequest = new Stack<>();

    public Observable<AuthenticationResult> login(final AuthenticationRequest request) {
        
        AuthenticationRequestHolder cached = cachedRequest.isEmpty()?null:cachedRequest.pop();
        if (cached != null && cached.request.equals(request)) {
            cachedRequest.push(cached);
            return cached.result;
        }

hashbrown

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
Read 1 MB sequentially from memory ..... 250,000 ns  = 250 µs

Round trip within same datacenter ...... 500,000 ns = 0.5 ms

hashbrown

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:divider="?android:attr/dividerHorizontal"
    android:showDividers="middle">

    <TextView android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"