:fix: improve event bus observability

broker/artemis/plugin/src/main/java/org/eclipse/kapua/broker/artemis/plugin/security/MetricsSecurityPlugin.java

@@ -26,15 +26,10 @@
 @Singleton
 public class MetricsSecurityPlugin {
 
-    private static final String CONNECTION = "connection";
-    private static final String SESSION = "session";
     private static final String ACL = "acl";
-    private static final String BROKER_CONNECTION = "broker_connection";
     private static final String SESSION_CONTEXT = "session_context";
     private static final String SESSION_CONTEXT_BY_CLIENT = "session_context_by_client";
     private static final String ACTIVE_CONNECTION = "active_connection";
-    private static final String DISK_USAGE = "disk_usage";
-    private static final String TOTAL_CONNECTION = "total_connection";
     private static final String TOTAL_MESSAGE = "total_message";
     private static final String TOTAL_MESSAGE_ACKNOWLEDGED = "total_message_acknowledged";
     private static final String TOTAL_MESSAGE_ADDED = "total_message_added";
@@ -57,12 +52,6 @@ public void init(ActiveMQServer server, Gauge<Integer> mapSize, Gauge<Integer> m
         metricsService.registerGauge(aclSize, metricModuleName, LoginMetric.COMPONENT_LOGIN, ACL);
         metricsService.registerGauge(activeConnection, metricModuleName, LoginMetric.COMPONENT_LOGIN, ACTIVE_CONNECTION);
 
-        metricsService.registerGauge(() -> server.getSessions().size(), metricModuleName, LoginMetric.COMPONENT_LOGIN, SESSION);
-        metricsService.registerGauge(() -> server.getConnectionCount(), metricModuleName, LoginMetric.COMPONENT_LOGIN, CONNECTION);
-        metricsService.registerGauge(() -> server.getBrokerConnections().size(), metricModuleName, LoginMetric.COMPONENT_LOGIN, BROKER_CONNECTION);
-        //from broker
-        metricsService.registerGauge(() -> server.getDiskStoreUsage(), metricModuleName, LoginMetric.COMPONENT_LOGIN, DISK_USAGE, MetricsLabel.SIZE);
-        metricsService.registerGauge(() -> server.getTotalConnectionCount(), metricModuleName, LoginMetric.COMPONENT_LOGIN, TOTAL_CONNECTION, MetricsLabel.SIZE);
         metricsService.registerGauge(() -> server.getTotalMessageCount(), metricModuleName, LoginMetric.COMPONENT_LOGIN, TOTAL_MESSAGE, MetricsLabel.SIZE);
         metricsService.registerGauge(() -> server.getTotalMessagesAcknowledged(), metricModuleName, LoginMetric.COMPONENT_LOGIN, TOTAL_MESSAGE_ACKNOWLEDGED, MetricsLabel.SIZE);
         metricsService.registerGauge(() -> server.getTotalMessagesAdded(), metricModuleName, LoginMetric.COMPONENT_LOGIN, TOTAL_MESSAGE_ADDED, MetricsLabel.SIZE);

commons/src/main/java/org/eclipse/kapua/commons/event/ServiceEventBusDriver.java

@@ -28,4 +28,6 @@ public interface ServiceEventBusDriver {
     public void stop() throws ServiceEventBusException;
 
     public ServiceEventBus getEventBus();
+
+    public Boolean isConnected();
 }

commons/src/main/java/org/eclipse/kapua/commons/event/jms/JMSServiceEventBus.java

@@ -136,6 +136,10 @@
         KapuaSession.createFrom(kapuaEvent.getScopeId(), kapuaEvent.getUserId());
     }
 
+    public Boolean isConnected() {
+        return eventBusJMSConnectionBridge.isConnected();
+    }
+
     /**
      * Stop the event bus
      *
@@ -209,9 +213,15 @@
         private Connection jmsConnection;
         private Map<String, SenderPool> senders = new HashMap<>();
         private ExceptionListenerImpl exceptionListener;
+        private Boolean connected;
 
         public EventBusJMSConnectionBridge() {
             this.exceptionListener = new ExceptionListenerImpl();
+            connected = Boolean.FALSE;
+        }
+
+        Boolean isConnected() {
+            return connected;
         }
 
         void start() throws JMSException, NamingException, ServiceEventBusException {
@@ -230,6 +240,7 @@
 
             jmsConnection = jmsConnectionFactory.createConnection(eventbusUsername, eventbusPassword);
             jmsConnection.setExceptionListener(exceptionListener);
+            connected = Boolean.TRUE;
             jmsConnection.start();
         }
 
@@ -239,6 +250,7 @@
         }
 
         private void closeConnection() {
+            connected = Boolean.FALSE;
             try {
                 if (jmsConnection != null) {
                     exceptionListener.stop();
@@ -436,6 +448,7 @@
 
             @Override
             public void onException(JMSException e) {
+                connected = Boolean.FALSE;
                 LOGGER.error("EventBus Listener {} -  Connection thrown exception: {}", this, e.getMessage(), e);
                 commonsMetric.getEventBusConnectionError().inc();
                 int i = 1;

locator/guice/src/test/java/org/eclipse/kapua/locator/internal/TestModule.java

@@ -32,19 +32,22 @@ protected void configureModule() {
     @Singleton
     ServiceEventBusDriver serviceEventBusDriver() {
         return new ServiceEventBusDriver() {
+
+            private Boolean connected = Boolean.FALSE;
+
             @Override
             public String getType() {
                 return "test";
             }
 
             @Override
             public void start() throws ServiceEventBusException {
-                //Nothing to do!
+                connected = Boolean.TRUE;
             }
 
             @Override
             public void stop() throws ServiceEventBusException {
-                //Nothing to do!
+                connected = Boolean.FALSE;
             }
 
             @Override
@@ -61,6 +64,11 @@ public void subscribe(String address, String name, ServiceEventBusListener event
                     }
                 };
             }
+
+            @Override
+            public Boolean isConnected() {
+                return connected;
+            }
         };
     }
 }

message/internal/src/test/java/org/eclipse/kapua/message/internal/TestModule.java

@@ -47,19 +47,22 @@ String eventsModuleName() {
     @Singleton
     ServiceEventBusDriver serviceEventBusDriver() {
         return new ServiceEventBusDriver() {
+
+            private Boolean connected = Boolean.FALSE;
+
             @Override
             public String getType() {
                 return "test";
             }
 
             @Override
             public void start() throws ServiceEventBusException {
-                //Nothing to do!
+                connected = Boolean.TRUE;
             }
 
             @Override
             public void stop() throws ServiceEventBusException {
-                //Nothing to do!
+                connected = Boolean.FALSE;
             }
 
             @Override
@@ -76,6 +79,11 @@ public void subscribe(String address, String name, ServiceEventBusListener event
                     }
                 };
             }
+
+            @Override
+            public Boolean isConnected() {
+                return connected;
+            }
         };
     }
 }