Support resolve health groups

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/health/DefaultHealthIndicatorRegistry.java

@@ -18,7 +18,9 @@
 
 import java.util.Collections;
 import java.util.LinkedHashMap;
+import java.util.List;
 import java.util.Map;
+import java.util.stream.Collectors;
 
 import org.springframework.util.Assert;
 
@@ -27,6 +29,7 @@
  *
  * @author Vedran Pavic
  * @author Stephane Nicoll
+ * @author Eddú Meléndez
  * @since 2.1.0
  */
 public class DefaultHealthIndicatorRegistry implements HealthIndicatorRegistry {
@@ -82,6 +85,20 @@ public HealthIndicator get(String name) {
 		}
 	}
 
+	@Override
+	public Map<String, HealthIndicator> get(List<String> names) {
+		Assert.notEmpty(names, "Name must not be empty");
+		synchronized (this.monitor) {
+			return names.stream()
+					.map((name) -> this.healthIndicators.entrySet().stream()
+							.filter((entry) -> entry.getKey().equals(name))
+							.collect(Collectors.toMap(Map.Entry::getKey,
+									Map.Entry::getValue)))
+					.flatMap((map) -> map.entrySet().stream())
+					.collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
+		}
+	}
+
 	@Override
 	public Map<String, HealthIndicator> getAll() {
 		synchronized (this.monitor) {

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/health/HealthEndpoint.java

@@ -16,6 +16,10 @@
 
 package org.springframework.boot.actuate.health;
 
+import java.util.Arrays;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
 import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
 import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
 import org.springframework.boot.actuate.endpoint.annotation.Selector;
@@ -28,6 +32,7 @@
  * @author Christian Dupuis
  * @author Andy Wilkinson
  * @author Stephane Nicoll
+ * @author Eddú Meléndez
  * @since 2.0.0
  */
 @Endpoint(id = "health")
@@ -63,6 +68,14 @@ public Health healthForComponent(@Selector String component) {
 		return (indicator != null) ? indicator.health() : null;
 	}
 
+	@ReadOperation
+	public Health healthForComponents(@Selector String... components) {
+		HealthAggregator aggregator = new OrderedHealthAggregator();
+		Map<String, Health> healths = getNestedHealthIndicators(this.healthIndicator,
+				components);
+		return aggregator.aggregate(healths);
+	}
+
 	/**
 	 * Return the {@link Health} of a particular {@code instance} managed by the specified
 	 * {@code component} or {@code null} if that particular component is not a
@@ -88,4 +101,19 @@ private HealthIndicator getNestedHealthIndicator(HealthIndicator healthIndicator
 		return null;
 	}
 
+	private Map<String, Health> getNestedHealthIndicators(HealthIndicator healthIndicator,
+			String... names) {
+		if (healthIndicator instanceof CompositeHealthIndicator) {
+			Map<String, HealthIndicator> healthIndicators = ((CompositeHealthIndicator) healthIndicator)
+					.getRegistry().get(Arrays.asList(names));
+
+			Map<String, Health> healths = new LinkedHashMap<>();
+			for (Map.Entry<String, HealthIndicator> entry : healthIndicators.entrySet()) {
+				healths.put(entry.getKey(), entry.getValue().health());
+			}
+			return healths;
+		}
+		return null;
+	}
+
 }

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/health/HealthIndicatorRegistry.java

@@ -16,6 +16,7 @@
 
 package org.springframework.boot.actuate.health;
 
+import java.util.List;
 import java.util.Map;
 
 /**
@@ -26,6 +27,7 @@
  * @author Andy Wilkinson
  * @author Vedran Pavic
  * @author Stephane Nicoll
+ * @author Eddú Meléndez
  * @since 2.1.0
  */
 public interface HealthIndicatorRegistry {
@@ -57,6 +59,8 @@ public interface HealthIndicatorRegistry {
 	 */
 	HealthIndicator get(String name);
 
+	Map<String, HealthIndicator> get(List<String> names);
+
 	/**
 	 * Returns a snapshot of the registered health indicators and their names. The
 	 * contents of the map do not reflect subsequent changes to the registry.

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/health/HealthEndpointTests.java

@@ -32,6 +32,7 @@
  * @author Christian Dupuis
  * @author Andy Wilkinson
  * @author Stephane Nicoll
+ * @author Eddú Meléndez
  */
 public class HealthEndpointTests {
 
@@ -107,6 +108,22 @@ public void statusForComponentInstanceThatIsNotACompositeReturnNull() {
 		assertThat(health).isNull();
 	}
 
+	@Test
+	public void callSpecificComponents() {
+		Map<String, HealthIndicator> healthIndicators = new HashMap<>();
+		healthIndicators.put("one", one);
+		healthIndicators.put("two", two);
+		HealthEndpoint endpoint = new HealthEndpoint(
+				createHealthIndicator(healthIndicators));
+		Health health = endpoint.healthForComponents("one", "two");
+		assertThat(health.getStatus()).isEqualTo(Status.UP);
+		assertThat(health.getDetails()).containsOnlyKeys("one", "two");
+		Health upHealth = (Health) health.getDetails().get("one");
+		assertThat(upHealth.getDetails()).containsOnly(entry("first", "1"));
+		Health upAgainHealth = (Health) health.getDetails().get("two");
+		assertThat(upAgainHealth.getDetails()).containsOnly(entry("second", "2"));
+	}
+
 	private HealthIndicator createHealthIndicator(
 			Map<String, HealthIndicator> healthIndicators) {
 		return new CompositeHealthIndicator(new OrderedHealthAggregator(),