#35 springboot: custom metric - gauge

springboot/actuator/src/main/java/hello/ActuatorApplication.java

@@ -1,5 +1,7 @@
 package hello;
 
+import hello.order.gauge.StockConfigV1;
+import hello.order.gauge.StockConfigV2;
 import hello.order.v0.OrderConfigV0;
 import hello.order.v1.OrderConfigV1;
 import hello.order.v2.OrderConfigV2;
@@ -15,7 +17,9 @@ import org.springframework.context.annotation.Import;
 //@Import(OrderConfigV1.class)
 //@Import(OrderConfigV2.class)
 //@Import(OrderConfigV3.class)
-@Import(OrderConfigV4.class)
+//@Import(OrderConfigV4.class)
+//@Import({OrderConfigV4.class, StockConfigV1.class})
+@Import({OrderConfigV4.class, StockConfigV2.class})
 @SpringBootApplication(scanBasePackages = "hello.controller")
 public class ActuatorApplication {
 

springboot/actuator/src/main/java/hello/order/gauge/StockConfigV1.java

@@ -0,0 +1,35 @@
+package hello.order.gauge;
+
+import hello.order.OrderService;
+import io.micrometer.core.instrument.Gauge;
+import io.micrometer.core.instrument.MeterRegistry;
+import jakarta.annotation.PostConstruct;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class StockConfigV1 {
+
+    @Bean
+    public MyStockMetric myStockMetric(OrderService orderService, MeterRegistry registry) {
+        return new MyStockMetric(orderService, registry);
+    }
+
+    @Slf4j
+    @RequiredArgsConstructor
+    static class MyStockMetric {
+
+        private final OrderService orderService;
+        private final MeterRegistry registry;
+
+        @PostConstruct
+        public void init() {
+            Gauge.builder("my.stock", orderService, service -> {
+                log.info("stock gauge call");
+                return service.getStock().get();
+            }).register(registry);
+        }
+    }
+}

springboot/actuator/src/main/java/hello/order/gauge/StockConfigV2.java

@@ -0,0 +1,21 @@
+package hello.order.gauge;
+
+import hello.order.OrderService;
+import io.micrometer.core.instrument.Gauge;
+import io.micrometer.core.instrument.binder.MeterBinder;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Slf4j
+@Configuration
+public class StockConfigV2 {
+
+    @Bean
+    public MeterBinder stockSize(OrderService orderService) {
+        return registry -> Gauge.builder("my.stock", orderService, service -> {
+            log.info("stock gauge call");
+            return service.getStock().get();
+        }).register(registry);
+    }
+}