Stateless4j Example

Sample

This is example of a state machine created using stateless4j library.

This example models a simple jukebox.

The above diagram encoded using stateless4j API:

 var config = new StateMachineConfig<State, Trigger>();

 config.configure(State.IDLE)
         .permit(Trigger.COIN_INSERTED, State.SELECTION);

 config.configure(State.SELECTION)
         .onEntry(Main::showSongsList)
         .onExit(Main::hideSongsList)
         .permit(Trigger.START, State.PLAYING, Main::consumeCoin)
         .permit(Trigger.CANCEL, State.IDLE, Main::returnCoin);

 config.configure(State.RUNNING)
         .onEntry(Main::showTimer)
         .onExit(Main::hideTimer)
         .permit(Trigger.STOP, State.IDLE);

 config.configure(State.PLAYING)
         .substateOf(State.RUNNING)
         .onEntry(Main::playSong)
         .permit(Trigger.PAUSE, State.PAUSED);

 config.configure(State.PAUSED)
         .substateOf(State.RUNNING)
         .onEntry(Main::pauseSong)
         .permit(Trigger.RESUME, State.PLAYING);

Refer to full example source code

Diagram

Diagram is created using PlantUML. You can install PlantUML plugin for JetBrains IDEA to enjoy real-time preview. See top of Main class.

Licence

Apache License, Version 2.0