Hands-On Cloud-Native Applications with Java and Quarkus

Using Timeout, Fallback, and Retry to create resilient services

In simple terms, the @org.eclipse.microprofile.faulttolerance.Timeout annotation can be used to specify the maximum time (in ms) allowed for returning a response in a method. Here is an example findAll method that times out after 250 ms:

@Timeout(250)public List<Customer> findAll() {    randomSleep();    return entityManager.createNamedQuery("Customers.findAll", Customer.class)            .getResultList();}private void randomSleep() {    try {        Thread.sleep(new Random().nextInt(400));    } catch (java.lang.InterruptedException e) {        e.printStackTrace();    }}

The random sleep that's triggered by the finder method can be used to allow some occasional execution failures.

In order to mitigate time-outs or ...