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Spring State Machine Deploy Sample
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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
 *
 * https://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.deploy;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.statemachine.action.Action;
import org.springframework.statemachine.config.EnableStateMachine;
import org.springframework.statemachine.config.StateMachineConfigurerAdapter;
import org.springframework.statemachine.config.builders.StateMachineConfigurationConfigurer;
import org.springframework.statemachine.config.builders.StateMachineModelConfigurer;
import org.springframework.statemachine.config.model.StateMachineModelFactory;
import org.springframework.statemachine.guard.Guard;
import org.springframework.statemachine.uml.UmlStateMachineModelFactory;

@Configuration
public class StateMachineConfig {

	@Configuration
	@EnableStateMachine
	public static class Config extends StateMachineConfigurerAdapter {

		@Override
		public void configure(StateMachineConfigurationConfigurer config)
				throws Exception {
			config
				.withConfiguration()
					.autoStartup(true)
					.listener(stateMachineLogListener());
		}

		@Override
		public void configure(StateMachineModelConfigurer model)
				throws Exception {
			model
				.withModel()
					.factory(modelFactory());
		}

		@Bean
		public StateMachineModelFactory modelFactory() {
			return new UmlStateMachineModelFactory("classpath:model.uml");
		}

		@Bean
		public StateMachineLogListener stateMachineLogListener() {
			return new StateMachineLogListener();
		}

		@Bean
		public Action errorEntryAction() {
			return (context) -> {
				System.out.println("Should handle error " + context.getMessageHeader("error"));
			};
		}

		@Bean
		public Action readyEntryAction() {
			return (context) -> {
				context.getExtendedState().getVariables().clear();
			};
		}

		@Bean
		public Action prepareDeployEntryAction() {
			return (context) -> {
				System.out.println("Handle deploy prepare here");
			};
		}

		@Bean
		public Action installEntryAction() {
			return (context) -> {
				System.out.println("Handle install here");
			};
		}

		@Bean
		public Action startEntryAction() {
			return (context) -> {
				System.out.println("Handle start here");
			};
		}

		@Bean
		public Action stopEntryAction() {
			return (context) -> {
				System.out.println("Handle stop here");
			};
		}

		@Bean
		public Action exitErrorAction() {
			return (context) -> {
				if (context.getMessageHeaders().containsKey("hasError")) {
					context.getExtendedState().getVariables().put("hasError", true);
					context.getExtendedState().getVariables().put("error", new RuntimeException("Exception set in machine"));
				}
				if (context.getMessageHeaders().containsKey("isInstalled")) {
					context.getExtendedState().getVariables().put("isInstalled", true);
				}
				if (context.getMessageHeaders().containsKey("installedOk")) {
					context.getExtendedState().getVariables().put("installedOk", true);
				}
				if (context.getMessageHeaders().containsKey("isRunning")) {
					context.getExtendedState().getVariables().put("isRunning", true);
				}
			};
		}

		@Bean
		public Guard isInstalledGuard() {
			return (context) -> {
				return context.getExtendedState().getVariables().containsKey("isInstalled");
			};
		}

		@Bean
		public Guard installedOkGuard() {
			return (context) -> {
				return context.getExtendedState().getVariables().containsKey("installedOk");
			};
		}

		@Bean
		public Guard isRunningGuard() {
			return (context) -> {
				return context.getExtendedState().getVariables().containsKey("isRunning");
			};
		}

		@Bean
		public Guard hasErrorGuard() {
			return (context) -> {
				return context.getExtendedState().getVariables().containsKey("hasError");
			};
		}
	}
}