Package org.apache.flink.streaming.examples.statemachine.generator

Class EventsGenerator

java.lang.Object
org.apache.flink.streaming.examples.statemachine.generator.EventsGenerator
public class EventsGenerator extends Object
A generator for events. The generator internally maintains a series of state machines (addresses and current associated state) and returns transition events from those state machines. Each time the next event is generators, this generator picks a random state machine and creates a random transition on that state machine.

The generator randomly adds new state machines, and removes state machines as soon as they reach the terminal state. This implementation maintains up to 1000 state machines concurrently.

  • Constructor Details

    • EventsGenerator

      public EventsGenerator()

    • EventsGenerator

      public EventsGenerator(double errorProb)

  • Method Details

    • next

      public Event next(int minIp, int maxIp)
      Creates a new random event. This method randomly pick either one of its currently running state machines, or start a new state machine for a random IP address.

      With errorProb probability, the generated event will be from an illegal state transition of one of the currently running state machines.

      Parameters:
      minIp - The lower bound for the range from which a new IP address may be picked.
      maxIp - The upper bound for the range from which a new IP address may be picked.
      Returns:
      A next random event.

    • nextInvalid

      @Nullable public Event nextInvalid()
      Creates an event for an illegal state transition of one of the internal state machines. If the generator has not yet started any state machines (for example, because no call to next(int, int) was made, yet), this will return null.
      Returns:
      An event for a illegal state transition, or null, if not possible.

    • numActiveEntries

      public int numActiveEntries()