/*
* Copyright 2016 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 demo.eventservice;
import java.io.IOException;
import java.io.InputStream;
import java.util.EnumSet;
import java.util.Scanner;
import org.springframework.aop.framework.ProxyFactoryBean;
import org.springframework.aop.target.CommonsPool2TargetSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Scope;
import org.springframework.context.annotation.ScopedProxyMode;
import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.statemachine.StateContext;
import org.springframework.statemachine.StateMachine;
import org.springframework.statemachine.StateMachinePersist;
import org.springframework.statemachine.action.Action;
import org.springframework.statemachine.config.StateMachineBuilder;
import org.springframework.statemachine.config.StateMachineBuilder.Builder;
import org.springframework.statemachine.persist.RepositoryStateMachinePersist;
import org.springframework.statemachine.redis.RedisStateMachineContextRepository;
import org.springframework.statemachine.redis.RedisStateMachinePersister;
@Configuration
public class StateMachineConfig {
//tag::snippetA[]
@Bean
@Scope(value = "request", proxyMode = ScopedProxyMode.TARGET_CLASS)
public ProxyFactoryBean stateMachine() {
ProxyFactoryBean pfb = new ProxyFactoryBean();
pfb.setTargetSource(poolTargetSource());
return pfb;
}
//end::snippetA[]
//tag::snippetB[]
@Bean
public CommonsPool2TargetSource poolTargetSource() {
CommonsPool2TargetSource pool = new CommonsPool2TargetSource();
pool.setMaxSize(3);
pool.setTargetBeanName("stateMachineTarget");
return pool;
}
//end::snippetB[]
//tag::snippetC[]
@Bean(name = "stateMachineTarget")
@Scope(scopeName="prototype")
public StateMachine<States, Events> stateMachineTarget() throws Exception {
Builder<States, Events> builder = StateMachineBuilder.<States, Events>builder();
builder.configureConfiguration()
.withConfiguration()
.autoStartup(true);
builder.configureStates()
.withStates()
.initial(States.HOME)
.states(EnumSet.allOf(States.class));
builder.configureTransitions()
.withInternal()
.source(States.ITEMS).event(Events.ADD)
.action(addAction())
.and()
.withInternal()
.source(States.CART).event(Events.DEL)
.action(delAction())
.and()
.withInternal()
.source(States.PAYMENT).event(Events.PAY)
.action(payAction())
.and()
.withExternal()
.source(States.HOME).target(States.ITEMS)
.action(pageviewAction())
.event(Events.VIEW_I)
.and()
.withExternal()
.source(States.CART).target(States.ITEMS)
.action(pageviewAction())
.event(Events.VIEW_I)
.and()
.withExternal()
.source(States.ITEMS).target(States.CART)
.action(pageviewAction())
.event(Events.VIEW_C)
.and()
.withExternal()
.source(States.PAYMENT).target(States.CART)
.action(pageviewAction())
.event(Events.VIEW_C)
.and()
.withExternal()
.source(States.CART).target(States.PAYMENT)
.action(pageviewAction())
.event(Events.VIEW_P)
.and()
.withExternal()
.source(States.ITEMS).target(States.HOME)
.action(resetAction())
.event(Events.RESET)
.and()
.withExternal()
.source(States.CART).target(States.HOME)
.action(resetAction())
.event(Events.RESET)
.and()
.withExternal()
.source(States.PAYMENT).target(States.HOME)
.action(resetAction())
.event(Events.RESET);
return builder.build();
}
//end::snippetC[]
@Bean
public Action<States, Events> pageviewAction() {
return new Action<States, Events>() {
@Override
public void execute(StateContext<States, Events> context) {
String variable = context.getTarget().getId().toString();
Integer count = context.getExtendedState().get(variable, Integer.class);
if (count == null) {
context.getExtendedState().getVariables().put(variable, 1);
} else {
context.getExtendedState().getVariables().put(variable, (count + 1));
}
}
};
}
@Bean
public Action<States, Events> addAction() {
return new Action<States, Events>() {
@Override
public void execute(StateContext<States, Events> context) {
Integer count = context.getExtendedState().get("COUNT", Integer.class);
if (count == null) {
context.getExtendedState().getVariables().put("COUNT", 1);
} else {
context.getExtendedState().getVariables().put("COUNT", (count + 1));
}
}
};
}
@Bean
public Action<States, Events> delAction() {
return new Action<States, Events>() {
@Override
public void execute(StateContext<States, Events> context) {
Integer count = context.getExtendedState().get("COUNT", Integer.class);
if (count != null && count > 0) {
context.getExtendedState().getVariables().put("COUNT", (count - 1));
}
}
};
}
@Bean
public Action<States, Events> payAction() {
return new Action<States, Events>() {
@Override
public void execute(StateContext<States, Events> context) {
context.getExtendedState().getVariables().put("PAYED", true);
}
};
}
@Bean
public Action<States, Events> resetAction() {
return new Action<States, Events>() {
@Override
public void execute(StateContext<States, Events> context) {
context.getExtendedState().getVariables().clear();
}
};
}
//tag::snippetD[]
@Bean
public RedisConnectionFactory redisConnectionFactory() {
return new JedisConnectionFactory();
}
@Bean
public StateMachinePersist<States, Events, String> stateMachinePersist(RedisConnectionFactory connectionFactory) {
RedisStateMachineContextRepository<States, Events> repository =
new RedisStateMachineContextRepository<States, Events>(connectionFactory);
return new RepositoryStateMachinePersist<States, Events>(repository);
}
@Bean
public RedisStateMachinePersister<States, Events> redisStateMachinePersister(
StateMachinePersist<States, Events, String> stateMachinePersist) {
return new RedisStateMachinePersister<States, Events>(stateMachinePersist);
}
//end::snippetD[]
@Bean
public String stateChartModel() throws IOException {
ClassPathResource model = new ClassPathResource("statechartmodel.txt");
InputStream inputStream = model.getInputStream();
Scanner scanner = new Scanner(inputStream);
String content = scanner.useDelimiter("\\Z").next();
scanner.close();
return content;
}
public enum States {
HOME,
ITEMS,
CART,
PAYMENT
}
public enum Events {
VIEW_I,
VIEW_C,
VIEW_P,
RESET,
ADD,
DEL,
PAY
}
}