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This commit is contained in:
Kamil Patryk Kozakowski
2026-06-06 15:07:03 +02:00
parent 00161b294c
commit cc66b7517b
88 changed files with 1090 additions and 79 deletions
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7
state_machines/simple_state_machine/src/main/java/click/kamil/examples/statemachine/simple/OrderEvents.java Normal file
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package click.kamil.examples.statemachine.simple;
public enum OrderEvents {
FULFILL, PAY, CANCEL,
ABCD, NOPE, IGNORE
}

5
state_machines/simple_state_machine/src/main/java/click/kamil/examples/statemachine/simple/OrderStates.java Normal file
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package click.kamil.examples.statemachine.simple;
public enum OrderStates {
SUBMITTED, PAID, FULFILLED, CANCELED, PAID1, PAID2, PAID3, INVALID, HAPPEN, SKIPPED, NEVER
}

103
state_machines/simple_state_machine/src/main/java/click/kamil/examples/statemachine/simple/SimpleEnumStateMachineConfiguration.java Normal file
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package click.kamil.examples.statemachine.simple;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Configuration;
import org.springframework.statemachine.StateContext;
import org.springframework.statemachine.action.Action;
import org.springframework.statemachine.config.EnableStateMachineFactory;
import org.springframework.statemachine.config.StateMachineConfigurerAdapter;
import org.springframework.statemachine.config.builders.StateMachineConfigurationConfigurer;
import org.springframework.statemachine.config.builders.StateMachineStateConfigurer;
import org.springframework.statemachine.config.builders.StateMachineTransitionConfigurer;
import org.springframework.statemachine.guard.Guard;
import org.springframework.statemachine.listener.StateMachineListenerAdapter;
import org.springframework.statemachine.state.State;
@Configuration
@EnableStateMachineFactory(name = "simpleEnumStateMachineFactory")
@Slf4j
class SimpleEnumStateMachineConfiguration extends StateMachineConfigurerAdapter<OrderStates, OrderEvents> {
@Override
public void configure(StateMachineTransitionConfigurer<OrderStates, OrderEvents> transitions) throws Exception {
Guard<OrderStates, OrderEvents> guard1 = null;
Action<OrderStates, OrderEvents> action2 = null;
transitions
.withExternal().source(OrderStates.SUBMITTED).target(OrderStates.PAID).event(OrderEvents.PAY)
.and()
.withExternal().source(OrderStates.PAID).target(OrderStates.FULFILLED).event(OrderEvents.FULFILL)
.and()
.withExternal().source(OrderStates.SUBMITTED).target(OrderStates.CANCELED).event(OrderEvents.CANCEL).guard(new Guard<OrderStates, OrderEvents>() {
@Override
public boolean evaluate(StateContext<OrderStates, OrderEvents> context) {
return false;
}
})
.and()
.withExternal().source(OrderStates.PAID).target(OrderStates.CANCELED).event(OrderEvents.CANCEL)
.and()
.withExternal().source(OrderStates.SUBMITTED).event(OrderEvents.ABCD)
// it needs to have target specified to get added to .transitions collections
// .withExternal().source(OrderStates.SUBMITTED).target(OrderStates.SUBMITTED).event(OrderEvents.ABCD)
//
.and()
.withChoice()
.source(OrderStates.SUBMITTED)
.first(OrderStates.PAID2, new Guard<OrderStates, OrderEvents>() {
@Override
public boolean evaluate(StateContext<OrderStates, OrderEvents> context) {
return false;
}
})
.last(OrderStates.PAID3)
.and()
.withChoice().source(OrderStates.PAID)
.first(OrderStates.PAID1, new Guard<OrderStates, OrderEvents>() {
@Override
public boolean evaluate(StateContext<OrderStates, OrderEvents> context) {
return true;
}
})
.then(OrderStates.PAID2, guard1)
.then(OrderStates.HAPPEN, new Guard<OrderStates, OrderEvents>() {
@Override
public boolean evaluate(StateContext<OrderStates, OrderEvents> context) {
return false;
}
})
.last(OrderStates.PAID3)
.and().withExternal().source(OrderStates.PAID2).target(OrderStates.CANCELED)
.and().withExternal().source(OrderStates.PAID3).target(OrderStates.CANCELED)
// .and().withLocal().source(OrderStates.SUBMITTED).target(OrderStates.CANCELED)
.and().withExternal().source(OrderStates.PAID1).event(OrderEvents.ABCD).action(new Action<OrderStates, OrderEvents>() {
@Override
public void execute(StateContext<OrderStates, OrderEvents> context) {
;
}
}).action(action2);
}
@Override
public void configure(StateMachineStateConfigurer<OrderStates, OrderEvents> states) throws Exception {
states.withStates()
.initial(OrderStates.SUBMITTED)
.state(OrderStates.PAID)
.state(OrderStates.PAID2)
.state(OrderStates.PAID3)
.end(OrderStates.FULFILLED)
.end(OrderStates.CANCELED);
}
@Override
public void configure(StateMachineConfigurationConfigurer<OrderStates, OrderEvents> config) throws Exception {
StateMachineListenerAdapter<OrderStates, OrderEvents> listenerAdapter = new StateMachineListenerAdapter<>() {
@Override
public void stateChanged(State<OrderStates, OrderEvents> from, State<OrderStates, OrderEvents> to) {
log.info("state changed from {} to {}", from, to);
}
};
config.withConfiguration()
.autoStartup(false)
.listener(listenerAdapter);
}
}

11
state_machines/simple_state_machine/src/main/java/click/kamil/examples/statemachine/simple/app/StateMachineApplication.java Normal file
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package click.kamil.examples.statemachine.simple.app;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
class StateMachineApplication {
public static void main(String[] args) {
SpringApplication.run(StateMachineApplication.class, args);
}
}

1
state_machines/simple_state_machine/src/main/resources/application.properties Normal file
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spring.application.name=statemachinedemo

11
state_machines/simple_state_machine/src/test/java/click/kamil/examples/statemachine/MyTest.java Normal file
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package click.kamil.examples.statemachine;
import org.junit.jupiter.api.Test;
class MyTest {
@Test
void contextLoads() {
}
}