/*
* Copyright 2014 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.yarn.support.statemachine;
import static org.hamcrest.Matchers.is;
import static org.hamcrest.Matchers.notNullValue;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
import java.util.ArrayList;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.junit.Test;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.task.SyncTaskExecutor;
import org.springframework.core.task.TaskExecutor;
import org.springframework.messaging.MessageHeaders;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.yarn.support.statemachine.action.Action;
import org.springframework.yarn.support.statemachine.config.EnableStateMachine;
import org.springframework.yarn.support.statemachine.config.EnumStateMachineConfigurerAdapter;
import org.springframework.yarn.support.statemachine.config.builders.StateMachineStateConfigurer;
import org.springframework.yarn.support.statemachine.config.builders.StateMachineTransitionConfigurer;
import org.springframework.yarn.support.statemachine.listener.StateMachineListener;
import org.springframework.yarn.support.statemachine.state.State;
public class ListenerTests extends AbstractStateMachineTests {
@Test
public void testStateEvents() {
AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(Config.class);
assertTrue(ctx.containsBean(StateMachineSystemConstants.DEFAULT_ID_STATEMACHINE));
@SuppressWarnings("unchecked")
EnumStateMachine<TestStates,TestEvents> machine =
ctx.getBean(StateMachineSystemConstants.DEFAULT_ID_STATEMACHINE, EnumStateMachine.class);
TestStateMachineListener listener = new TestStateMachineListener();
machine.addStateListener(listener);
assertThat(machine, notNullValue());
machine.sendEvent(MessageBuilder.withPayload(TestEvents.E1).setHeader("foo", "jee1").build());
assertThat(listener.states.size(), is(1));
assertThat(listener.states.get(0).from.getId(), is(TestStates.S1));
assertThat(listener.states.get(0).to.getId(), is(TestStates.S2));
machine.sendEvent(MessageBuilder.withPayload(TestEvents.E2).setHeader("foo", "jee2").build());
assertThat(listener.states.size(), is(2));
assertThat(listener.states.get(1).from.getId(), is(TestStates.S2));
assertThat(listener.states.get(1).to.getId(), is(TestStates.S3));
machine.sendEvent(MessageBuilder.withPayload(TestEvents.E4).setHeader("foo", "jee2").build());
assertThat(listener.states.size(), is(2));
ctx.close();
}
private static class LoggingAction implements Action {
private static final Log log = LogFactory.getLog(LoggingAction.class);
private String message;
public LoggingAction(String message) {
this.message = message;
}
@Override
public void execute(MessageHeaders headers) {
log.info("Hello from LoggingAction " + message + " foo=" + headers.get("foo"));
}
}
private static class TestStateMachineListener implements StateMachineListener<State<TestStates, TestEvents>, TestEvents> {
ArrayList<Holder> states = new ArrayList<Holder>();
@Override
public void stateChanged(State<TestStates, TestEvents> from, State<TestStates, TestEvents> to) {
states.add(new Holder(from, to));
}
static class Holder {
State<TestStates, TestEvents> from;
State<TestStates, TestEvents> to;
public Holder(State<TestStates, TestEvents> from, State<TestStates, TestEvents> to) {
this.from = from;
this.to = to;
}
}
}
@Configuration
@EnableStateMachine
static class Config extends EnumStateMachineConfigurerAdapter<TestStates, TestEvents> {
@Override
public void configure(StateMachineStateConfigurer<TestStates, TestEvents> states) throws Exception {
states
.withStates()
.initial(TestStates.S1)
.state(TestStates.S1)
.state(TestStates.S2)
.state(TestStates.S3, TestEvents.E4)
.state(TestStates.S4);
}
@Override
public void configure(StateMachineTransitionConfigurer<TestStates, TestEvents> transitions) throws Exception {
transitions
.withExternal()
.source(TestStates.S1)
.target(TestStates.S2)
.event(TestEvents.E1)
.action(loggingAction())
.action(loggingAction())
.and()
.withExternal()
.source(TestStates.S2)
.target(TestStates.S3)
.event(TestEvents.E2)
.action(loggingAction())
.and()
.withExternal()
.source(TestStates.S3)
.target(TestStates.S4)
.event(TestEvents.E3)
.action(loggingAction())
.and()
.withExternal()
.source(TestStates.S4)
.target(TestStates.S3)
.event(TestEvents.E4)
.action(loggingAction());
}
@Bean
public LoggingAction loggingAction() {
return new LoggingAction("as bean");
}
@Bean
public TaskExecutor taskExecutor() {
return new SyncTaskExecutor();
}
}
}