GH-9381: Introduce Control Bus commands management

Fixes: #9381

Currently, there is no way to know in one place what Control Bus commands are available and with what arguments

* Add `ControlBusCommandRegistry` infrastructure bean to gather control bus commands from beans and expose them for invocation
* Add `ControlBusController` to expose a `/control-bus` REST service against the mentioned `ControlBusCommandRegistry`
* Add `@EnableIntegrationManagement(loadControlBusCommands)` to be able to load all the Control Bus commands from the application context instead of on demand by default
* Deprecated existing SpEL(and Groovy)-based Control Bus functionality in favor of new, more manageable, logic

spring-integration-http/src/test/java/org/springframework/integration/http/management/ControlBusControllerTests.java

@@ -0,0 +1,163 @@
+/*
+ * Copyright 2024 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 org.springframework.integration.http.management;
+
+import org.hamcrest.Matchers;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.http.MediaType;
+import org.springframework.integration.config.EnableIntegration;
+import org.springframework.integration.http.config.EnableControlBusController;
+import org.springframework.jmx.export.annotation.ManagedOperation;
+import org.springframework.jmx.export.annotation.ManagedResource;
+import org.springframework.test.annotation.DirtiesContext;
+import org.springframework.test.context.junit.jupiter.web.SpringJUnitWebConfig;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.setup.MockMvcBuilders;
+import org.springframework.web.context.WebApplicationContext;
+import org.springframework.web.servlet.config.annotation.EnableWebMvc;
+
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.handler;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+/**
+ * @author Artem Bilan
+ *
+ * @since 6.4
+ */
+@SpringJUnitWebConfig
+@DirtiesContext
+public class ControlBusControllerTests {
+
+	@Autowired
+	WebApplicationContext wac;
+
+	MockMvc mockMvc;
+
+	@Autowired
+	TestManagementComponent testManagementComponent;
+
+	@BeforeEach
+	void setup() {
+		this.mockMvc = MockMvcBuilders.webAppContextSetup(this.wac).build();
+	}
+
+	@Test
+	void allCommandsAreRegistered() throws Exception {
+		this.mockMvc.perform(get("/control-bus")
+						.accept(MediaType.APPLICATION_JSON))
+				.andExpect(status().isOk())
+				.andExpect(content().contentType(MediaType.APPLICATION_JSON_VALUE))
+				.andExpect(handler().handlerType(ControlBusController.class))
+				.andExpect(handler().methodName("getCommands"))
+				.andExpect(content().string(Matchers.containsString("testManagementComponent.operation")))
+				.andExpect(content().string(Matchers.containsString("testManagementComponent.operation2")))
+				.andExpect(content().string(Matchers.containsString("taskScheduler.setPoolSize")))
+				.andExpect(content().string(Matchers.containsString("integrationHeaderChannelRegistry.runReaper")))
+				.andExpect(content().string(Matchers.containsString("_org.springframework.integration.errorLogger.isRunning")))
+				.andExpect(content().string(Matchers.containsString("The overloaded operation with int argument")))
+				.andExpect(content().string(Matchers.containsString("The overloaded operation with two arguments")));
+	}
+
+	@Test
+	void commandsForBean() throws Exception {
+		this.mockMvc.perform(get("/control-bus/testManagementComponent")
+						.accept(MediaType.APPLICATION_JSON))
+				.andExpect(status().isOk())
+				.andExpect(content().contentType(MediaType.APPLICATION_JSON_VALUE))
+				.andExpect(handler().handlerType(ControlBusController.class))
+				.andExpect(handler().methodName("getCommandsForBean"))
+				.andExpect(content().string(Matchers.containsString("testManagementComponent.operation")))
+				.andExpect(content().string(Matchers.containsString("testManagementComponent.operation2")));
+	}
+
+	@Test
+	void controlBusCommandIsPerformedOverRestCall() throws Exception {
+		this.mockMvc.perform(post("/control-bus/testManagementComponent.operation")
+						.contentType(MediaType.APPLICATION_JSON)
+						.content("""
+								[
+									{
+										"value": "1",
+										"parameterType": "int"
+									}
+								]
+								"""))
+				.andExpect(status().isOk())
+				.andExpect(handler().handlerType(ControlBusController.class))
+				.andExpect(handler().methodName("invokeCommand"));
+
+		verify(this.testManagementComponent).operation(eq(1));
+
+		this.mockMvc.perform(post("/control-bus/testManagementComponent.operation2"))
+				.andExpect(status().isOk())
+				.andExpect(handler().handlerType(ControlBusController.class))
+				.andExpect(handler().methodName("invokeCommand"))
+				.andExpect(content().string("123"));
+
+		verify(this.testManagementComponent).operation2();
+	}
+
+	@Configuration
+	@EnableWebMvc
+	@EnableIntegration
+	@EnableControlBusController
+	static class ContextConfiguration {
+
+		@Bean
+		TestManagementComponent testManagementComponent() {
+			return spy(new TestManagementComponent());
+		}
+
+	}
+
+	@ManagedResource
+	private static class TestManagementComponent {
+
+		@ManagedOperation
+		public void operation() {
+
+		}
+
+		@ManagedOperation(description = "The overloaded operation with int argument")
+		public void operation(int input) {
+
+		}
+
+		@ManagedOperation(description = "The overloaded operation with two arguments")
+		public void operation(int input1, String input2) {
+
+		}
+
+		@ManagedOperation
+		public int operation2() {
+			return 123;
+		}
+
+	}
+
+}