feat(jans-link): add health check service in jans link #5608

jans-link/server/src/main/java/io/jans/link/service/SystemResteasyInitializer.java

@@ -0,0 +1,34 @@
+/*
+ * Janssen Project software is available under the MIT License (2008). See http://opensource.org/licenses/MIT for full text.
+ *
+ * Copyright (c) 2020, Janssen Project
+ */
+
+package io.jans.link.service;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import io.jans.link.ws.rs.HealthCheckController;
+import jakarta.ws.rs.ApplicationPath;
+import jakarta.ws.rs.core.Application;
+
+
+/**
+ * Integration with Resteasy
+ * 
+ * @author Yuriy Movchan
+ * @version 0.1, 11/13/2020
+ */
+@ApplicationPath("/sys")
+public class SystemResteasyInitializer extends Application {	
+
+	@Override
+    public Set<Class<?>> getClasses() {
+        HashSet<Class<?>> classes = new HashSet<Class<?>>();
+        classes.add(HealthCheckController.class);
+
+        return classes;
+    }
+
+}

jans-link/server/src/main/java/io/jans/link/ws/rs/HealthCheckController.java

@@ -0,0 +1,42 @@
+/*
+ * Janssen Project software is available under the MIT License (2008). See http://opensource.org/licenses/MIT for full text.
+ *
+ * Copyright (c) 2020, Janssen Project
+ */
+
+package io.jans.link.ws.rs;
+
+import jakarta.enterprise.context.ApplicationScoped;
+import jakarta.inject.Inject;
+import jakarta.ws.rs.GET;
+import jakarta.ws.rs.POST;
+import jakarta.ws.rs.Path;
+import jakarta.ws.rs.Produces;
+import jakarta.ws.rs.core.MediaType;
+
+import io.jans.orm.PersistenceEntryManager;
+
+/**
+ * Health check controller
+ * 
+ * @author Yuriy Movchan
+ * @version Jul 24, 2020
+ */
+@ApplicationScoped
+@Path("/")
+public class HealthCheckController {
+
+	@Inject
+	private PersistenceEntryManager persistenceEntryManager;
+
+    @GET
+    @POST
+    @Path("/health-check")
+    @Produces(MediaType.APPLICATION_JSON)
+	public String healthCheckController() {
+    	boolean isConnected = persistenceEntryManager.getOperationService().isConnected();
+    	String dbStatus = isConnected ? "online" : "offline"; 
+        return "{\"status\": \"running\", \"db_status\":\"" + dbStatus + "\"}";
+	}
+
+}

jans-link/server/src/main/webapp/index.jsp

@@ -1 +1 @@
-<% out.print("Jans Config- Api"); %>
+<% out.print("Jans Link "); %>