added SystemHealth

Author: open-schnick

pom.xml

@@ -20,27 +20,30 @@
 
 	<dependencies>
 
-		<dependency>
-			<groupId>org.projectlombok</groupId>
-			<artifactId>lombok</artifactId>
-			<version>LATEST</version>
-		</dependency>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-web</artifactId>
 		</dependency>
 
+		<!--
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-data-mongodb</artifactId>
 		</dependency>
+		-->
 
 		<dependency>
 			<groupId>io.springfox</groupId>
 			<artifactId>springfox-boot-starter</artifactId>
 			<version>3.0.0</version>
 		</dependency>
 
+		<dependency>
+			<groupId>org.projectlombok</groupId>
+			<artifactId>lombok</artifactId>
+			<version>LATEST</version>
+		</dependency>
+
 		<!-- tag::spring-hateoas[] -->
 		<dependency>
 			<groupId>org.springframework.boot</groupId>

src/main/java/de/filefighter/rest/health/business/SystemHealthBusinessService.java

@@ -0,0 +1,19 @@
+package de.filefighter.rest.health.business;
+
+import de.filefighter.rest.health.data.SystemHealth;
+import org.springframework.stereotype.Service;
+
+import java.time.Instant;
+
+@Service
+public class SystemHealthBusinessService {
+
+    private final long serverStartedAt = Instant.now().getEpochSecond();
+
+    public SystemHealth getCurrentSystemHealthInfo(){
+        long currentEpoch = Instant.now().getEpochSecond();
+        return SystemHealth.builder()
+                .uptimeInSeconds(currentEpoch - serverStartedAt)
+                .create();
+    }
+}

src/main/java/de/filefighter/rest/health/business/SystemHealthModelAssembler.java

@@ -0,0 +1,16 @@
+package de.filefighter.rest.health.business;
+
+import de.filefighter.rest.health.data.SystemHealth;
+import org.jetbrains.annotations.NotNull;
+import org.springframework.hateoas.EntityModel;
+import org.springframework.hateoas.server.RepresentationModelAssembler;
+import org.springframework.stereotype.Component;
+
+@Component
+public class SystemHealthModelAssembler implements RepresentationModelAssembler<SystemHealth, EntityModel<SystemHealth>> {
+
+    @Override
+    public @NotNull EntityModel<SystemHealth> toModel(@NotNull SystemHealth entity) {
+        return EntityModel.of(entity);
+    }
+}

src/main/java/de/filefighter/rest/health/data/SystemHealth.java

@@ -0,0 +1,10 @@
+package de.filefighter.rest.health.data;
+
+import lombok.Builder;
+import lombok.Data;
+
+@Data
+@Builder(buildMethodName = "create")
+public class SystemHealth {
+    private long uptimeInSeconds;
+}

src/main/java/de/filefighter/rest/health/rest/HealthRestController.java

@@ -0,0 +1,23 @@
+package de.filefighter.rest.health.rest;
+
+import de.filefighter.rest.health.data.SystemHealth;
+import org.springframework.hateoas.EntityModel;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/health")
+public class HealthRestController {
+
+    private final HealthRestInterface healthRestService;
+
+    public HealthRestController(HealthRestInterface healthRestService) {
+        this.healthRestService = healthRestService;
+    }
+
+    @GetMapping("/")
+    public EntityModel<SystemHealth> getSystemHealthInfo(){
+        return healthRestService.getSystemHealth();
+    }
+}

src/main/java/de/filefighter/rest/health/rest/HealthRestInterface.java

@@ -0,0 +1,8 @@
+package de.filefighter.rest.health.rest;
+
+import de.filefighter.rest.health.data.SystemHealth;
+import org.springframework.hateoas.EntityModel;
+
+public interface HealthRestInterface {
+    EntityModel<SystemHealth> getSystemHealth();
+}

src/main/java/de/filefighter/rest/health/rest/HealthRestService.java

@@ -0,0 +1,25 @@
+package de.filefighter.rest.health.rest;
+
+import de.filefighter.rest.health.business.SystemHealthBusinessService;
+import de.filefighter.rest.health.business.SystemHealthModelAssembler;
+import de.filefighter.rest.health.data.SystemHealth;
+import org.springframework.hateoas.EntityModel;
+import org.springframework.stereotype.Service;
+
+@Service
+public class HealthRestService implements HealthRestInterface{
+
+    private final SystemHealthBusinessService systemHealthBusinessService;
+    private final SystemHealthModelAssembler systemHealthModelAssembler;
+
+    public HealthRestService(SystemHealthBusinessService systemHealthBusinessService, SystemHealthModelAssembler systemHealthModelAssembler) {
+        this.systemHealthBusinessService = systemHealthBusinessService;
+        this.systemHealthModelAssembler = systemHealthModelAssembler;
+    }
+
+    @Override
+    public EntityModel<SystemHealth> getSystemHealth() {
+        SystemHealth systemHealth = systemHealthBusinessService.getCurrentSystemHealthInfo();
+        return systemHealthModelAssembler.toModel(systemHealth);
+    }
+}