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Spring State Machine Monitoring Sample

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/*
 * Copyright 2016-2019 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.monitoring;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.statemachine.StateMachine;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import reactor.core.publisher.Mono;

@Controller
public class StateMachineController {

	@Autowired
	private StateMachine stateMachine;

	@RequestMapping("/")
	public String home() {
		return "redirect:/state";
	}

	@RequestMapping("/state")
	public String feedAndGetStates(@RequestParam(value = "events", required = false) List events, Model model) throws Exception {
		StateMachineLogListener listener = new StateMachineLogListener();
		stateMachine.addStateListener(listener);
		stateMachine.startReactively().block();
		if (events != null) {
			for (String event : events) {
				stateMachine
					.sendEvent(Mono.just(MessageBuilder
						.withPayload(event).build()))
					.blockLast();
			}
		}
		stateMachine.stopReactively().block();
		model.addAttribute("allEvents", new String[]{"E1", "E2"});
		model.addAttribute("messages", createMessages(listener.getMessages()));
		return "states";
	}

	private String createMessages(List messages) {
		StringBuilder buf = new StringBuilder();
		for (String message : messages) {
			buf.append(message);
			buf.append("\n");
		}
		return buf.toString();
	}

}