/*
* Copyright 2015 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.statemachine;
import static org.hamcrest.Matchers.containsInAnyOrder;
import static org.hamcrest.Matchers.is;
import static org.junit.Assert.assertThat;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import org.junit.Test;
import org.springframework.context.ApplicationListener;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.Message;
import org.springframework.statemachine.access.StateMachineAccess;
import org.springframework.statemachine.access.StateMachineFunction;
import org.springframework.statemachine.config.EnableStateMachine;
import org.springframework.statemachine.config.EnumStateMachineConfigurerAdapter;
import org.springframework.statemachine.config.builders.StateMachineStateConfigurer;
import org.springframework.statemachine.config.builders.StateMachineTransitionConfigurer;
import org.springframework.statemachine.event.OnStateMachineError;
import org.springframework.statemachine.event.StateMachineEvent;
import org.springframework.statemachine.listener.StateMachineListener;
import org.springframework.statemachine.listener.StateMachineListenerAdapter;
import org.springframework.statemachine.state.State;
import org.springframework.statemachine.support.StateMachineInterceptorAdapter;
import org.springframework.statemachine.transition.Transition;
/**
* Tests for various errors and error handling.
*
* @author Janne Valkealahti
*
*/
public class StateMachineErrorTests extends AbstractStateMachineTests {
@Override
protected AnnotationConfigApplicationContext buildContext() {
return new AnnotationConfigApplicationContext();
}
@Test
public void testEvents() throws Exception {
context.register(EventListenerConfig1.class, Config1.class);
context.refresh();
TestApplicationEventListener1 listener1 = context.getBean(TestApplicationEventListener1.class);
TestApplicationEventListener2 listener3 = context.getBean(TestApplicationEventListener2.class);
@SuppressWarnings("unchecked")
ObjectStateMachine<TestStates,TestEvents> machine =
context.getBean(StateMachineSystemConstants.DEFAULT_ID_STATEMACHINE, ObjectStateMachine.class);
assertThat(machine.hasStateMachineError(), is(false));
TestStateMachineListener listener2 = new TestStateMachineListener();
machine.addStateListener(listener2);
machine.start();
machine.setStateMachineError(new RuntimeException("myerror"));
assertThat(listener1.latch.await(1, TimeUnit.SECONDS), is(true));
assertThat(listener1.count, is(1));
assertThat(listener3.latch.await(1, TimeUnit.SECONDS), is(true));
assertThat(listener3.count, is(1));
assertThat(listener2.latch.await(1, TimeUnit.SECONDS), is(true));
assertThat(listener2.count, is(1));
assertThat(machine.hasStateMachineError(), is(true));
}
@Test
public void testInterceptHandlesError() throws Exception {
context.register(EventListenerConfig1.class, Config1.class);
context.refresh();
TestApplicationEventListener1 listener1 = context.getBean(TestApplicationEventListener1.class);
@SuppressWarnings("unchecked")
ObjectStateMachine<TestStates,TestEvents> machine =
context.getBean(StateMachineSystemConstants.DEFAULT_ID_STATEMACHINE, ObjectStateMachine.class);
assertThat(machine.hasStateMachineError(), is(false));
machine.getStateMachineAccessor().doWithRegion(new StateMachineFunction<StateMachineAccess<TestStates,TestEvents>>() {
@Override
public void apply(StateMachineAccess<TestStates, TestEvents> function) {
function.addStateMachineInterceptor(new StateMachineInterceptorAdapter<TestStates,TestEvents>() {
@Override
public Exception stateMachineError(StateMachine<TestStates, TestEvents> stateMachine,
Exception exception) {
return null;
}
});
}
});
TestStateMachineListener listener2 = new TestStateMachineListener();
machine.addStateListener(listener2);
machine.start();
machine.setStateMachineError(new RuntimeException("myerror"));
assertThat(listener1.latch.await(1, TimeUnit.SECONDS), is(false));
assertThat(listener1.count, is(0));
assertThat(listener2.latch.await(1, TimeUnit.SECONDS), is(false));
assertThat(listener2.count, is(0));
assertThat(machine.hasStateMachineError(), is(false));
}
@Test
public void testErrorActive() throws Exception {
context.register(Config1.class);
context.refresh();
@SuppressWarnings("unchecked")
ObjectStateMachine<TestStates,TestEvents> machine =
context.getBean(StateMachineSystemConstants.DEFAULT_ID_STATEMACHINE, ObjectStateMachine.class);
assertThat(machine.hasStateMachineError(), is(false));
machine.start();
machine.setStateMachineError(new RuntimeException("myerror"));
assertThat(machine.hasStateMachineError(), is(true));
assertThat(machine.getState().getIds(), containsInAnyOrder(TestStates.S1));
machine.sendEvent(TestEvents.E1);
assertThat(machine.getState().getIds(), containsInAnyOrder(TestStates.S1));
}
@Test
public void testListenerErrorsCauseNoMalfunction() throws Exception {
context.register(EventListenerConfig2.class, Config1.class);
context.refresh();
@SuppressWarnings("unchecked")
ObjectStateMachine<TestStates,TestEvents> machine =
context.getBean(StateMachineSystemConstants.DEFAULT_ID_STATEMACHINE, ObjectStateMachine.class);
StartedStateMachineListener listener1 = new StartedStateMachineListener();
ErroringStateMachineListener listener2 = new ErroringStateMachineListener();
StateChangedStateMachineListener listener3 = new StateChangedStateMachineListener();
machine.addStateListener(listener1);
machine.addStateListener(listener2);
machine.start();
assertThat(listener1.latch.await(2, TimeUnit.SECONDS), is(true));
machine.addStateListener(listener3);
machine.sendEvent(TestEvents.E1);
assertThat(listener3.latch.await(2, TimeUnit.SECONDS), is(true));
assertThat(machine.getState().getIds(), containsInAnyOrder(TestStates.S2));
}
@Test
public void testListenerErrorsCauseNoMalfunction2() throws Exception {
context.register(EventListenerConfig2.class, Config1.class);
context.refresh();
@SuppressWarnings("unchecked")
ObjectStateMachine<TestStates,TestEvents> machine =
context.getBean(StateMachineSystemConstants.DEFAULT_ID_STATEMACHINE, ObjectStateMachine.class);
StartedStateMachineListener listener1 = new StartedStateMachineListener();
ErroringStateMachineListener2 listener2 = new ErroringStateMachineListener2();
StateChangedStateMachineListener listener3 = new StateChangedStateMachineListener();
machine.addStateListener(listener1);
machine.addStateListener(listener2);
machine.start();
assertThat(listener1.latch.await(2, TimeUnit.SECONDS), is(true));
machine.addStateListener(listener3);
machine.sendEvent(TestEvents.E1);
assertThat(listener3.latch.await(2, TimeUnit.SECONDS), is(true));
assertThat(machine.getState().getIds(), containsInAnyOrder(TestStates.S2));
}
@Configuration
@EnableStateMachine
static class Config1 extends EnumStateMachineConfigurerAdapter<TestStates, TestEvents> {
@Override
public void configure(StateMachineStateConfigurer<TestStates, TestEvents> states) throws Exception {
states
.withStates()
.initial(TestStates.S1)
.state(TestStates.S2)
.state(TestStates.S3)
.state(TestStates.S4);
}
@Override
public void configure(StateMachineTransitionConfigurer<TestStates, TestEvents> transitions) throws Exception {
transitions
.withExternal()
.source(TestStates.S1)
.target(TestStates.S2)
.event(TestEvents.E1)
.and()
.withExternal()
.source(TestStates.S2)
.target(TestStates.S3)
.event(TestEvents.E2)
.and()
.withExternal()
.source(TestStates.S3)
.target(TestStates.S4)
.event(TestEvents.E3)
.and()
.withExternal()
.source(TestStates.S4)
.target(TestStates.S3)
.event(TestEvents.E4);
}
}
@Configuration
@EnableStateMachine
static class Config2 extends EnumStateMachineConfigurerAdapter<TestStates, TestEvents> {
@Override
public void configure(StateMachineStateConfigurer<TestStates, TestEvents> states) throws Exception {
states
.withStates()
.initial(TestStates.S1)
.state(TestStates.S2)
.state(TestStates.S3);
}
@Override
public void configure(StateMachineTransitionConfigurer<TestStates, TestEvents> transitions) throws Exception {
transitions
.withExternal()
.source(TestStates.S1)
.target(TestStates.S2)
.event(TestEvents.E1)
.and()
.withExternal()
.source(TestStates.S2)
.target(TestStates.S3)
.event(TestEvents.E2);
}
}
@Configuration
static class EventListenerConfig1 {
@Bean
public TestApplicationEventListener1 testApplicationEventListener1() {
return new TestApplicationEventListener1();
}
@Bean
public TestApplicationEventListener2 testApplicationEventListener2() {
return new TestApplicationEventListener2();
}
}
@Configuration
static class EventListenerConfig2 {
@Bean
public ErroringApplicationEventListener1 erroringApplicationEventListener1() {
return new ErroringApplicationEventListener1();
}
}
static class TestStateMachineListener extends StateMachineListenerAdapter<TestStates, TestEvents> {
CountDownLatch latch = new CountDownLatch(1);
int count = 0;
@Override
public void stateMachineError(StateMachine<TestStates, TestEvents> stateMachine, Exception exception) {
count++;
latch.countDown();
}
}
static class TestApplicationEventListener1 implements ApplicationListener<StateMachineEvent> {
CountDownLatch latch = new CountDownLatch(1);
int count = 0;
@Override
public void onApplicationEvent(StateMachineEvent event) {
if (event instanceof OnStateMachineError) {
count++;
latch.countDown();
}
}
}
static class TestApplicationEventListener2 implements ApplicationListener<OnStateMachineError> {
CountDownLatch latch = new CountDownLatch(1);
int count = 0;
@Override
public void onApplicationEvent(OnStateMachineError event) {
count++;
latch.countDown();
}
}
static class ErroringApplicationEventListener1 implements ApplicationListener<StateMachineEvent> {
@Override
public void onApplicationEvent(StateMachineEvent event) {
throw new RuntimeException();
}
}
static class StateChangedStateMachineListener extends StateMachineListenerAdapter<TestStates, TestEvents> {
CountDownLatch latch = new CountDownLatch(1);
@Override
public void stateChanged(State<TestStates, TestEvents> from, State<TestStates, TestEvents> to) {
latch.countDown();
}
void reset(int a) {
latch = new CountDownLatch(a);
}
}
static class StartedStateMachineListener extends StateMachineListenerAdapter<TestStates, TestEvents> {
CountDownLatch latch = new CountDownLatch(1);
@Override
public void stateMachineStarted(StateMachine<TestStates, TestEvents> stateMachine) {
latch.countDown();
}
}
static class ErroringStateMachineListener implements StateMachineListener<TestStates, TestEvents> {
@Override
public void stateChanged(State<TestStates, TestEvents> from, State<TestStates, TestEvents> to) {
throw new RuntimeException();
}
@Override
public void stateEntered(State<TestStates, TestEvents> state) {
throw new RuntimeException();
}
@Override
public void stateExited(State<TestStates, TestEvents> state) {
throw new RuntimeException();
}
@Override
public void eventNotAccepted(Message<TestEvents> event) {
throw new RuntimeException();
}
@Override
public void transition(Transition<TestStates, TestEvents> transition) {
throw new RuntimeException();
}
@Override
public void transitionStarted(Transition<TestStates, TestEvents> transition) {
throw new RuntimeException();
}
@Override
public void transitionEnded(Transition<TestStates, TestEvents> transition) {
throw new RuntimeException();
}
@Override
public void stateMachineStarted(StateMachine<TestStates, TestEvents> stateMachine) {
throw new RuntimeException();
}
@Override
public void stateMachineStopped(StateMachine<TestStates, TestEvents> stateMachine) {
throw new RuntimeException();
}
@Override
public void stateMachineError(StateMachine<TestStates, TestEvents> stateMachine, Exception exception) {
throw new RuntimeException();
}
@Override
public void extendedStateChanged(Object key, Object value) {
throw new RuntimeException();
}
@Override
public void stateContext(StateContext<TestStates, TestEvents> stateContext) {
throw new RuntimeException();
}
}
static class ErroringStateMachineListener2 implements StateMachineListener<TestStates, TestEvents> {
@Override
public void stateChanged(State<TestStates, TestEvents> from, State<TestStates, TestEvents> to) {
throw new Error();
}
@Override
public void stateEntered(State<TestStates, TestEvents> state) {
throw new Error();
}
@Override
public void stateExited(State<TestStates, TestEvents> state) {
throw new Error();
}
@Override
public void eventNotAccepted(Message<TestEvents> event) {
throw new Error();
}
@Override
public void transition(Transition<TestStates, TestEvents> transition) {
throw new Error();
}
@Override
public void transitionStarted(Transition<TestStates, TestEvents> transition) {
throw new Error();
}
@Override
public void transitionEnded(Transition<TestStates, TestEvents> transition) {
throw new Error();
}
@Override
public void stateMachineStarted(StateMachine<TestStates, TestEvents> stateMachine) {
throw new Error();
}
@Override
public void stateMachineStopped(StateMachine<TestStates, TestEvents> stateMachine) {
throw new Error();
}
@Override
public void stateMachineError(StateMachine<TestStates, TestEvents> stateMachine, Exception exception) {
throw new Error();
}
@Override
public void extendedStateChanged(Object key, Object value) {
throw new Error();
}
@Override
public void stateContext(StateContext<TestStates, TestEvents> stateContext) {
throw new Error();
}
}
}