baldapps/EasyFlow-Android

EasyFlow - Simple and lightweight Finite State Machine for Java

EasyFlow-Android

This work is just conversion of EasyFlow forked from EasyFlow

EasyFlow-Android has the following:

• Implement standard Logging from Android android.util.Log instead of org.slf4j.Logger
• Add check whether Event has State to map to.
• Life-cycle aware

For more info on EasyFlow refer to original repository : EasyFlow

README from source

EasyFlow is a simple and lightweight Finite State Machine for Java

With EasyFlow you can:

• implement complex logic but keep your code simple and clean
• handle asynchronous calls with ease and elegance
• avoid concurrency by using event-driven programming approach
• avoid StackOverflow error by avoiding recursion
• simplify design, programming and testing of complex java applications

All this in less then 30kB and no run-time overhead!

Here is a simple example illustrating how a state machine can be definded and implemented with EasyFlow

This is a State diargam fragment describing a simple ATM workflow

With EasyFlow we can define the above state machine like this

EasyFlow flow = FlowBuilder
    .from(SHOWING_WELCOME, "myflow").transit(
        onCardPresent.to(WAITING_FOR_PIN).transit(
            onPinProvided.to(...).transit(
                ...
            ),
            onCancel.to(RETURNING_CARD).transit(
                onCardExtracted.to(SHOWING_WELCOME)
            )
        )
    )

then all what's left to do is to implement our state handlers like so

SHOWING_WELCOME.whenEnter((state, context) -> {
        ...
        btnOption1.setOnClickListener(v -> {
            onCardPresent.trigger(context);
        });
        ...
    }
});
...

and start the flow

flow.start(new FlowContext());

See the complete example