From 850ace5f5e34bc2747aa82546837abdc286cec6a Mon Sep 17 00:00:00 2001
From: Mona Mohamadinia <mona.mohamadinia@gmail.com>
Date: Fri, 14 Aug 2020 03:02:52 +0430
Subject: [PATCH] Custom Health Indicators in Spring Boot

---
 .../baeldung/health/HealthApplication.java    | 12 ++++++++
 .../health/RandomHealthIndicator.java         | 28 +++++++++++++++++++
 .../src/main/resources/application.properties |  6 +++-
 3 files changed, 45 insertions(+), 1 deletion(-)
 create mode 100644 spring-boot-modules/spring-boot-actuator/src/main/java/com/baeldung/health/HealthApplication.java
 create mode 100644 spring-boot-modules/spring-boot-actuator/src/main/java/com/baeldung/health/RandomHealthIndicator.java

diff --git a/spring-boot-modules/spring-boot-actuator/src/main/java/com/baeldung/health/HealthApplication.java b/spring-boot-modules/spring-boot-actuator/src/main/java/com/baeldung/health/HealthApplication.java
new file mode 100644
index 0000000000..af1f35b29f
--- /dev/null
+++ b/spring-boot-modules/spring-boot-actuator/src/main/java/com/baeldung/health/HealthApplication.java
@@ -0,0 +1,12 @@
+package com.baeldung.health;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class HealthApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(HealthApplication.class, args);
+    }
+}
diff --git a/spring-boot-modules/spring-boot-actuator/src/main/java/com/baeldung/health/RandomHealthIndicator.java b/spring-boot-modules/spring-boot-actuator/src/main/java/com/baeldung/health/RandomHealthIndicator.java
new file mode 100644
index 0000000000..958f173458
--- /dev/null
+++ b/spring-boot-modules/spring-boot-actuator/src/main/java/com/baeldung/health/RandomHealthIndicator.java
@@ -0,0 +1,28 @@
+package com.baeldung.health;
+
+import org.springframework.boot.actuate.health.Health;
+import org.springframework.boot.actuate.health.HealthIndicator;
+import org.springframework.stereotype.Component;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.ThreadLocalRandom;
+
+@Component
+public class RandomHealthIndicator implements HealthIndicator {
+
+    @Override
+    public Health health() {
+        double chance = ThreadLocalRandom.current().nextDouble();
+        Health.Builder status = Health.up();
+        if (chance > 0.9) {
+            status = Health.down(new RuntimeException("Bad Luck"));
+        }
+
+        Map<String, Object> details = new HashMap<>();
+        details.put("chance", chance);
+        details.put("strategy", "thread-local");
+
+        return status.withDetails(details).build();
+    }
+}
diff --git a/spring-boot-modules/spring-boot-actuator/src/main/resources/application.properties b/spring-boot-modules/spring-boot-actuator/src/main/resources/application.properties
index 8c706a9b1d..290221b731 100644
--- a/spring-boot-modules/spring-boot-actuator/src/main/resources/application.properties
+++ b/spring-boot-modules/spring-boot-actuator/src/main/resources/application.properties
@@ -1 +1,5 @@
-management.health.probes.enabled=true
\ No newline at end of file
+management.health.probes.enabled=true
+management.endpoint.health.show-details=always
+management.health.random.enabled=false
+management.endpoint.health.status.http-mapping.down=500
+management.endpoint.health.status.http-mapping.out_of_service=503
\ No newline at end of file