Add initial infra for config repository

- Initial infra for config abstraction with
  Spring Data Repositories via RepositoryStateMachineModelFactory.
- Initial jpa impl.
- Initial jpa sample atop of H2 DB.
- Relates to #250

spring-statemachine-samples/datajpa/src/main/java/demo/datajpa/Application.java

@@ -0,0 +1,31 @@
+/*
+ * 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.datajpa;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.orm.jpa.EntityScan;
+import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+
+@SpringBootApplication
+@EntityScan(basePackages = {"org.springframework.statemachine.data.jpa"})
+@EnableJpaRepositories(basePackages = {"org.springframework.statemachine.data.jpa"})
+public class Application {
+
+	public static void main(String[] args) {
+		SpringApplication.run(Application.class, args);
+	}
+}

spring-statemachine-samples/datajpa/src/main/java/demo/datajpa/StateMachineConfig.java

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+/*
+ * 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.datajpa;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.core.io.Resource;
+import org.springframework.data.repository.init.Jackson2RepositoryPopulatorFactoryBean;
+import org.springframework.statemachine.config.EnableStateMachineFactory;
+import org.springframework.statemachine.config.StateMachineConfigurerAdapter;
+import org.springframework.statemachine.config.builders.StateMachineModelConfigurer;
+import org.springframework.statemachine.config.model.StateMachineModelFactory;
+import org.springframework.statemachine.data.RepositoryState;
+import org.springframework.statemachine.data.RepositoryStateMachineModelFactory;
+import org.springframework.statemachine.data.RepositoryTransition;
+import org.springframework.statemachine.data.StateRepository;
+import org.springframework.statemachine.data.TransitionRepository;
+
+@Configuration
+public class StateMachineConfig {
+
+	@Bean
+	public Jackson2RepositoryPopulatorFactoryBean jackson2RepositoryPopulatorFactoryBean() {
+		Jackson2RepositoryPopulatorFactoryBean factoryBean = new Jackson2RepositoryPopulatorFactoryBean();
+		factoryBean.setResources(new Resource[]{new ClassPathResource("data.json")});
+		return factoryBean;
+	}
+
+	@Configuration
+	@EnableStateMachineFactory
+	public static class Config extends StateMachineConfigurerAdapter<String, String> {
+
+		@Autowired
+		private StateRepository<? extends RepositoryState> stateRepository;
+
+		@Autowired
+		private TransitionRepository<? extends RepositoryTransition> transitionRepository;
+
+		@Override
+		public void configure(StateMachineModelConfigurer<String, String> model) throws Exception {
+			model
+				.withModel()
+					.factory(modelFactory());
+		}
+
+		@Bean
+		public StateMachineModelFactory<String, String> modelFactory() {
+			return new RepositoryStateMachineModelFactory(stateRepository, transitionRepository);
+		}
+	}
+}

spring-statemachine-samples/datajpa/src/main/java/demo/datajpa/StateMachineController.java

@@ -0,0 +1,80 @@
+/*
+ * 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.datajpa;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.statemachine.StateMachine;
+import org.springframework.statemachine.config.StateMachineFactory;
+import org.springframework.statemachine.data.RepositoryTransition;
+import org.springframework.statemachine.data.TransitionRepository;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+
+@Controller
+public class StateMachineController {
+
+	@Autowired
+	private StateMachineFactory<String, String> stateMachineFactory;
+
+	@Autowired
+	private TransitionRepository<? extends RepositoryTransition> transitionRepository;
+
+	@RequestMapping("/")
+	public String home() {
+		return "redirect:/state";
+	}
+
+	@RequestMapping("/state")
+	public String feedAndGetStates(@RequestParam(value = "events", required = false) List<String> events, Model model) throws Exception {
+
+		StateMachine<String, String> stateMachine = stateMachineFactory.getStateMachine();
+		StateMachineLogListener listener = new StateMachineLogListener();
+		stateMachine.addStateListener(listener);
+		stateMachine.start();
+		if (events != null) {
+			for (String event : events) {
+				stateMachine.sendEvent(event);
+			}
+		}
+		stateMachine.stop();
+		model.addAttribute("allEvents", getEvents());
+		model.addAttribute("messages", createMessages(listener.getMessages()));
+		return "states";
+	}
+
+	private String[] getEvents() {
+		List<String> events = new ArrayList<>();
+		for (RepositoryTransition t : transitionRepository.findAll()) {
+			events.add(t.getEvent());
+		}
+		return events.toArray(new String[0]);
+	}
+
+	private String createMessages(List<String> messages) {
+		StringBuilder buf = new StringBuilder();
+		for (String message : messages) {
+			buf.append(message);
+			buf.append("\n");
+		}
+		return buf.toString();
+	}
+
+}

spring-statemachine-samples/datajpa/src/main/java/demo/datajpa/StateMachineLogListener.java

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+/*
+ * 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.datajpa;
+
+import java.util.LinkedList;
+import java.util.List;
+
+import org.springframework.statemachine.StateContext;
+import org.springframework.statemachine.StateContext.Stage;
+import org.springframework.statemachine.listener.StateMachineListenerAdapter;
+
+public class StateMachineLogListener extends StateMachineListenerAdapter<String, String> {
+
+	private final LinkedList<String> messages = new LinkedList<String>();
+
+	public List<String> getMessages() {
+		return messages;
+	}
+
+	public void resetMessages() {
+		messages.clear();
+	}
+
+	@Override
+	public void stateContext(StateContext<String, String> stateContext) {
+		if (stateContext.getStage() == Stage.STATE_ENTRY) {
+			messages.addFirst("Enter " + stateContext.getTarget().getId());
+		} else if (stateContext.getStage() == Stage.STATE_EXIT) {
+			messages.addFirst("Exit " + stateContext.getSource().getId());
+		} else if (stateContext.getStage() == Stage.STATEMACHINE_START) {
+			messages.addLast("Machine started");
+		} else if (stateContext.getStage() == Stage.STATEMACHINE_STOP) {
+			messages.addFirst("Machine stopped");
+		}
+	}
+}

spring-statemachine-samples/datajpa/src/main/resources/application.yml

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+logging:
+  level:
+    root: INFO
+security:
+  basic:
+    enabled: false

spring-statemachine-samples/datajpa/src/main/resources/data.json

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+[
+	{
+		"_class": "org.springframework.statemachine.data.jpa.JpaRepositoryState",
+		"initial": true,
+		"state": "S1"
+	},
+	{
+		"_class": "org.springframework.statemachine.data.jpa.JpaRepositoryState",
+		"initial": false,
+		"state": "S2"
+	},
+	{
+		"_class": "org.springframework.statemachine.data.jpa.JpaRepositoryState",
+		"initial": false,
+		"state": "S3"
+	},
+	{
+		"_class": "org.springframework.statemachine.data.jpa.JpaRepositoryTransition",
+		"source": "S1",
+		"target": "S2",
+		"event": "E1"
+	},
+	{
+		"_class": "org.springframework.statemachine.data.jpa.JpaRepositoryTransition",
+		"source": "S2",
+		"target": "S3",
+		"event": "E2"
+	}
+]

spring-statemachine-samples/datajpa/src/main/resources/templates/states.html

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+<!DOCTYPE HTML>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+	<title>Spring Statemachine Demo</title>
+	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
+</head>
+<body>
+	<div>
+		<a href="/h2-console" target="_blank">h2 console</a>
+	</div>
+	<form action="#" data-th-action="@{/state}" data-th-object="${model}" method="post">
+		<div>
+			<p th:text="'Choose events'"/>
+			<ul>
+				<li th:each="ty : ${allEvents}">
+					<input type="checkbox" name="events" th:value="${ty}" />
+					<label th:text="${ty}">replaced</label>
+				</li>
+			</ul>
+		</div>
+		<button type="submit">Send Events</button>
+	</form>
+	<div>
+		<textarea th:text="${messages}" rows="20" cols="100"/>
+	</div>
+	<div>
+		<form action="#" data-th-action="@{/state}" method="get">
+			<button type="submit">Refresh</button>
+		</form>
+	</div>
+</body>
+</html>