add > Spring Boot Actuator DataSource metrics support, detail see issue #1799 .

druid-spring-boot-starter/src/main/java/com/alibaba/druid/spring/boot/autoconfigure/DruidDataSourceAutoConfigure.java

@@ -18,6 +18,9 @@ package com.alibaba.druid.spring.boot.autoconfigure;
 import com.alibaba.druid.pool.DruidDataSource;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.jdbc.metadata.DataSourcePoolMetadata;
+import org.springframework.boot.autoconfigure.jdbc.metadata.DataSourcePoolMetadataProvider;
+import org.springframework.boot.autoconfigure.jdbc.metadata.DataSourcePoolMetadataProvidersConfiguration;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -59,4 +62,21 @@ public class DruidDataSourceAutoConfigure {
 
         return dataSource;
     }
+
+    /**
+     * Register the {@link DataSourcePoolMetadataProvider} instances to support DataSource metrics.
+     * @see DataSourcePoolMetadataProvidersConfiguration
+     */
+    @Bean
+    public DataSourcePoolMetadataProvider druidDataSourcePoolMetadataProvider() {
+        return new DataSourcePoolMetadataProvider() {
+            @Override
+            public DataSourcePoolMetadata getDataSourcePoolMetadata(DataSource dataSource) {
+                if (dataSource instanceof DruidDataSource) {
+                    return new DruidDataSourcePoolMetadata((DruidDataSource)dataSource);
+                }
+                return null;
+            }
+        };
+    }
 }

druid-spring-boot-starter/src/main/java/com/alibaba/druid/spring/boot/autoconfigure/DruidDataSourcePoolMetadata.java

@@ -0,0 +1,41 @@
+package com.alibaba.druid.spring.boot.autoconfigure;
+
+import com.alibaba.druid.pool.DruidDataSource;
+import org.springframework.boot.autoconfigure.jdbc.metadata.AbstractDataSourcePoolMetadata;
+import org.springframework.boot.autoconfigure.jdbc.metadata.DataSourcePoolMetadata;
+
+/**
+ * {@link DataSourcePoolMetadata} for a Druid DataSource.
+ *
+ * @author lihengming [89921218@qq.com]
+ */
+public class DruidDataSourcePoolMetadata extends AbstractDataSourcePoolMetadata<DruidDataSource> {
+    /**
+     * Create an instance with the data source to use.
+     *
+     * @param dataSource the data source
+     */
+    public DruidDataSourcePoolMetadata(DruidDataSource dataSource) {
+        super(dataSource);
+    }
+
+    @Override
+    public Integer getActive() {
+        return getDataSource().getActiveCount();
+    }
+
+    @Override
+    public Integer getMax() {
+        return getDataSource().getMaxActive();
+    }
+
+    @Override
+    public Integer getMin() {
+        return getDataSource().getMinIdle();
+    }
+
+    @Override
+    public String getValidationQuery() {
+        return getDataSource().getValidationQuery();
+    }
+}