Merge pull request #780 from tjf/1.0.x

* pull780:
  Add multi-datasource health indicator support
  Add CompositeHealthIndicator

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/autoconfigure/EndpointAutoConfiguration.java

@@ -38,6 +38,7 @@ import org.springframework.boot.actuate.endpoint.RequestMappingEndpoint;
 import org.springframework.boot.actuate.endpoint.ShutdownEndpoint;
 import org.springframework.boot.actuate.endpoint.TraceEndpoint;
 import org.springframework.boot.actuate.endpoint.VanillaPublicMetrics;
+import org.springframework.boot.actuate.health.CompositeHealthIndicator;
 import org.springframework.boot.actuate.health.HealthIndicator;
 import org.springframework.boot.actuate.health.SimpleHealthIndicator;
 import org.springframework.boot.actuate.health.VanillaHealthIndicator;
@@ -75,7 +76,7 @@ public class EndpointAutoConfiguration {
 	private HealthIndicator<? extends Object> healthIndicator;
 
 	@Autowired(required = false)
-	private DataSource dataSource;
+	private Map<String, DataSource> dataSources;
 
 	@Autowired
 	private InfoPropertiesConfiguration properties;
@@ -97,20 +98,30 @@ public class EndpointAutoConfiguration {
 
 	@Bean
 	@ConditionalOnMissingBean
-	public HealthEndpoint<Object> healthEndpoint() {
+	public HealthEndpoint<?> healthEndpoint() {
 		if (this.healthIndicator == null) {
-			if (this.dataSource == null) {
+			this.healthIndicator = createHealthIndicator();
-				this.healthIndicator = new VanillaHealthIndicator();
-			}
-			else {
-				SimpleHealthIndicator healthIndicator = new SimpleHealthIndicator();
-				healthIndicator.setDataSource(this.dataSource);
-				this.healthIndicator = healthIndicator;
-			}
 		}
 		return new HealthEndpoint<Object>(this.healthIndicator);
 	}
 
+	private HealthIndicator<? extends Object> createHealthIndicator() {
+		if (this.dataSources == null || this.dataSources.isEmpty()) {
+			return new VanillaHealthIndicator();
+		}
+
+		if (this.dataSources.size() == 1) {
+			return new SimpleHealthIndicator(this.dataSources.values().iterator().next());
+		}
+
+		CompositeHealthIndicator composite = new CompositeHealthIndicator();
+		for (Map.Entry<String, DataSource> entry : this.dataSources.entrySet()) {
+			composite.addHealthIndicator(entry.getKey(),
+					new SimpleHealthIndicator(entry.getValue()));
+		}
+		return composite;
+	}
+
 	@Bean
 	@ConditionalOnMissingBean
 	public BeansEndpoint beansEndpoint() {

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

@@ -0,0 +1,61 @@
+/*
+ * Copyright 2012-2014 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.health;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+/**
+ * {@link HealthIndicator} that returns health indications from all registered delegates.
+ * 
+ * @author Tyler J. Frederick
+ * @author Phillip Webb
+ */
+public class CompositeHealthIndicator implements HealthIndicator<Map<String, Object>> {
+
+	private final Map<String, HealthIndicator<?>> indicators;
+
+	/**
+	 * Create a new {@link CompositeHealthIndicator}.
+	 */
+	public CompositeHealthIndicator() {
+		this.indicators = new LinkedHashMap<String, HealthIndicator<?>>();
+	}
+
+	/**
+	 * Create a new {@link CompositeHealthIndicator} from the specified indicators.
+	 * @param indicators a map of {@link HealthIndicator}s with the key being used as an
+	 * indicator name.
+	 */
+	public CompositeHealthIndicator(Map<String, HealthIndicator<?>> indicators) {
+		this.indicators = new LinkedHashMap<String, HealthIndicator<?>>(indicators);
+	}
+
+	public void addHealthIndicator(String name, HealthIndicator<?> indicator) {
+		this.indicators.put(name, indicator);
+	}
+
+	@Override
+	public Map<String, Object> health() {
+		Map<String, Object> health = new LinkedHashMap<String, Object>();
+		for (Map.Entry<String, HealthIndicator<?>> entry : this.indicators.entrySet()) {
+			health.put(entry.getKey(), entry.getValue().health());
+		}
+		return health;
+	}
+
+}

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

@@ -54,6 +54,21 @@ public class SimpleHealthIndicator implements HealthIndicator<Map<String, Object
 
 	private String query = null;
 
+	/**
+	 * Create a new {@link SimpleHealthIndicator} instance.
+	 */
+	public SimpleHealthIndicator() {
+	}
+
+	/**
+	 * Create a new {@link SimpleHealthIndicator} using the specified datasource.
+	 * @param dataSource the data source
+	 */
+	public SimpleHealthIndicator(DataSource dataSource) {
+		this.dataSource = dataSource;
+		this.jdbcTemplate = new JdbcTemplate(dataSource);
+	}
+
 	@Override
 	public Map<String, Object> health() {
 		LinkedHashMap<String, Object> health = new LinkedHashMap<String, Object>();

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

@@ -0,0 +1,94 @@
+/*
+ * Copyright 2012-2014 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.health;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.hasEntry;
+import static org.junit.Assert.assertThat;
+import static org.mockito.BDDMockito.given;
+
+/**
+ * Tests for {@link CompositeHealthIndicator}
+ * 
+ * @author Tyler J. Frederick
+ * @author Phillip Webb
+ */
+public class CompositeHealthIndicatorTests {
+
+	@Mock
+	private HealthIndicator<String> one;
+
+	@Mock
+	private HealthIndicator<String> two;
+
+	@Mock
+	private HealthIndicator<String> three;
+
+	@Before
+	public void setup() {
+		MockitoAnnotations.initMocks(this);
+		given(this.one.health()).willReturn("1");
+		given(this.two.health()).willReturn("2");
+		given(this.three.health()).willReturn("3");
+	}
+
+	@Test
+	public void createWithIndicators() throws Exception {
+		Map<String, HealthIndicator<?>> indicators = new HashMap<String, HealthIndicator<?>>();
+		indicators.put("one", this.one);
+		indicators.put("two", this.two);
+		CompositeHealthIndicator composite = new CompositeHealthIndicator(indicators);
+		Map<String, Object> result = composite.health();
+		assertThat(result.size(), equalTo(2));
+		assertThat(result, hasEntry("one", (Object) "1"));
+		assertThat(result, hasEntry("two", (Object) "2"));
+	}
+
+	@Test
+	public void createWithIndicatorsAndAdd() throws Exception {
+		Map<String, HealthIndicator<?>> indicators = new HashMap<String, HealthIndicator<?>>();
+		indicators.put("one", this.one);
+		indicators.put("two", this.two);
+		CompositeHealthIndicator composite = new CompositeHealthIndicator(indicators);
+		composite.addHealthIndicator("three", this.three);
+		Map<String, Object> result = composite.health();
+		assertThat(result.size(), equalTo(3));
+		assertThat(result, hasEntry("one", (Object) "1"));
+		assertThat(result, hasEntry("two", (Object) "2"));
+		assertThat(result, hasEntry("three", (Object) "3"));
+	}
+
+	@Test
+	public void createWithoutAndAdd() throws Exception {
+		CompositeHealthIndicator composite = new CompositeHealthIndicator();
+		composite.addHealthIndicator("one", this.one);
+		composite.addHealthIndicator("two", this.two);
+		Map<String, Object> result = composite.health();
+		assertThat(result.size(), equalTo(2));
+		assertThat(result, hasEntry("one", (Object) "1"));
+		assertThat(result, hasEntry("two", (Object) "2"));
+	}
+
+}