Migrate to Spring Integration Micrometer support

Remove custom `SpringIntegrationMetrics` and instead provide
auto-configuration to the direct Micrometer support added in Spring
Integration 5.0.2.

Closes gh-11985

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/integration/SpringIntegrationMetricsIntegrationTests.java

@@ -1,134 +0,0 @@
-/*
- * Copyright 2012-2018 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 org.springframework.boot.actuate.metrics.integration;
-
-import java.io.IOException;
-import java.util.Map;
-
-import com.fasterxml.jackson.databind.ObjectMapper;
-import io.micrometer.core.instrument.MeterRegistry;
-import io.micrometer.core.instrument.simple.SimpleMeterRegistry;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.context.annotation.Bean;
-import org.springframework.context.annotation.Configuration;
-import org.springframework.integration.annotation.Gateway;
-import org.springframework.integration.annotation.IntegrationComponentScan;
-import org.springframework.integration.annotation.MessagingGateway;
-import org.springframework.integration.config.EnableIntegration;
-import org.springframework.integration.dsl.IntegrationFlow;
-import org.springframework.integration.support.management.IntegrationManagementConfigurer;
-import org.springframework.test.context.junit4.SpringRunner;
-
-import static org.assertj.core.api.Assertions.assertThat;
-
-/**
- * Integration tests for {@link SpringIntegrationMetrics}.
- *
- * @author Jon Schneider
- * @author Andy Wilkinson
- */
-@RunWith(SpringRunner.class)
-public class SpringIntegrationMetricsIntegrationTests {
-
-	@Autowired
-	TestSpringIntegrationApplication.TempConverter converter;
-
-	@Autowired
-	MeterRegistry registry;
-
-	@Test
-	public void springIntegrationMetrics() {
-		this.converter.fahrenheitToCelsius(68.0);
-		assertThat(this.registry.get("spring.integration.channel.sends")
-				.tags("channel", "convert.input").functionCounter().count()).isEqualTo(1);
-		this.registry.get("spring.integration.handler.duration.min").gauge();
-		this.registry.get("spring.integration.sourceNames").meter();
-	}
-
-	@Configuration
-	@EnableIntegration
-	@IntegrationComponentScan
-	public static class TestSpringIntegrationApplication {
-
-		@Bean
-		MeterRegistry meterRegistry() {
-			return new SimpleMeterRegistry();
-		}
-
-		@Bean
-		public IntegrationManagementConfigurer integrationManagementConfigurer() {
-			IntegrationManagementConfigurer configurer = new IntegrationManagementConfigurer();
-			configurer.setDefaultCountsEnabled(true);
-			configurer.setDefaultStatsEnabled(true);
-			return configurer;
-		}
-
-		@Bean
-		public SpringIntegrationMetrics springIntegrationMetrics(
-				IntegrationManagementConfigurer configurer, MeterRegistry registry) {
-			SpringIntegrationMetrics springIntegrationMetrics = new SpringIntegrationMetrics(
-					configurer);
-			springIntegrationMetrics.bindTo(registry);
-			return springIntegrationMetrics;
-		}
-
-		@Bean
-		public IntegrationFlow convert() {
-			return (f) -> f
-					.transform((payload) -> "{\"fahrenheit\":" + payload + "}",
-							(e) -> e.id("toJson"))
-					.handle(String.class, this::fahrenheitToCelsius,
-							(e) -> e.id("temperatureConverter"))
-					.transform(this::extractResult, (e) -> e.id("toResponse"));
-		}
-
-		private double extractResult(String json) {
-			try {
-				return (double) new ObjectMapper().readValue(json, Map.class)
-						.get("celsius");
-			}
-			catch (IOException ex) {
-				throw new RuntimeException(ex);
-			}
-		}
-
-		private String fahrenheitToCelsius(String payload, Map<String, Object> headers) {
-			try {
-				double fahrenheit = (double) new ObjectMapper()
-						.readValue(payload, Map.class).get("fahrenheit");
-				double celsius = (fahrenheit - 32) * (5.0 / 9.0);
-				return "{\"celsius\":" + celsius + "}";
-			}
-			catch (Exception ex) {
-				throw new RuntimeException(ex);
-			}
-		}
-
-		@MessagingGateway
-		public interface TempConverter {
-
-			@Gateway(requestChannel = "convert.input")
-			double fahrenheitToCelsius(double fahrenheit);
-
-		}
-
-	}
-
-}