boseabhishek

panic signals "the programmer has made a fundamental mistake and execution cannot continue safely", whereas os.Exit signals "the programmer has decided that the process should terminate here" — different meanings. Also, important difference in behavior: panic will unwind the callstack, which means it will call any pending defer statements; os.Exit will just do a hard kill, so it won't.

boseabhishek

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

boseabhishek

package sample.akka.testkit

import akka.actor.ActorSystem
import akka.actor.Actor
import akka.testkit.{TestKit, TestActorRef}
import org.scalatest.matchers.MustMatchers
import org.scalatest.WordSpec

class ImplicitSenderTest extends TestKit(ActorSystem("testSystem"))
  // Using the ImplicitSender trait will automatically set `testActor` as the sender