--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/plugins/jvm-overview/agent/src/main/java/com/redhat/thermostat/jvm/overview/agent/internal/model/VmClassloaderInfoExtractor.java	Mon Sep 04 14:39:53 2017 +0200
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2012-2017 Red Hat, Inc.
+ *
+ * This file is part of Thermostat.
+ *
+ * Thermostat is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2, or (at your
+ * option) any later version.
+ *
+ * Thermostat is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Thermostat; see the file COPYING.  If not see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Linking this code with other modules is making a combined work
+ * based on this code.  Thus, the terms and conditions of the GNU
+ * General Public License cover the whole combination.
+ *
+ * As a special exception, the copyright holders of this code give
+ * you permission to link this code with independent modules to
+ * produce an executable, regardless of the license terms of these
+ * independent modules, and to copy and distribute the resulting
+ * executable under terms of your choice, provided that you also
+ * meet, for each linked independent module, the terms and conditions
+ * of the license of that module.  An independent module is a module
+ * which is not derived from or based on this code.  If you modify
+ * this code, you may extend this exception to your version of the
+ * library, but you are not obligated to do so.  If you do not wish
+ * to do so, delete this exception statement from your version.
+ */
+
+package com.redhat.thermostat.jvm.overview.agent.internal.model;
+
+import com.redhat.thermostat.jvm.overview.agent.VmUpdate;
+import com.redhat.thermostat.jvm.overview.agent.VmUpdateException;
+
+class VmClassloaderInfoExtractor {
+
+    final VmUpdate vmUpdate;
+
+    VmClassloaderInfoExtractor(VmUpdate update) {
+        this.vmUpdate = update;
+    }
+
+    public Long getLoadedClassesCount() throws VmUpdateException {
+        return vmUpdate.getPerformanceCounterLong("java.cls.loadedClasses");
+    }
+    
+    public Long getUnloadedClassesCount() throws VmUpdateException {
+        return vmUpdate.getPerformanceCounterLong("java.cls.unloadedClasses");
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/plugins/jvm-overview/agent/src/test/java/com/redhat/thermostat/jvm/overview/agent/internal/model/VmClassloaderInfoExtractorTest.java	Mon Sep 04 14:39:53 2017 +0200
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2012-2017 Red Hat, Inc.
+ *
+ * This file is part of Thermostat.
+ *
+ * Thermostat is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2, or (at your
+ * option) any later version.
+ *
+ * Thermostat is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Thermostat; see the file COPYING.  If not see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Linking this code with other modules is making a combined work
+ * based on this code.  Thus, the terms and conditions of the GNU
+ * General Public License cover the whole combination.
+ *
+ * As a special exception, the copyright holders of this code give
+ * you permission to link this code with independent modules to
+ * produce an executable, regardless of the license terms of these
+ * independent modules, and to copy and distribute the resulting
+ * executable under terms of your choice, provided that you also
+ * meet, for each linked independent module, the terms and conditions
+ * of the license of that module.  An independent module is a module
+ * which is not derived from or based on this code.  If you modify
+ * this code, you may extend this exception to your version of the
+ * library, but you are not obligated to do so.  If you do not wish
+ * to do so, delete this exception statement from your version.
+ */
+
+package com.redhat.thermostat.jvm.overview.agent.internal.model;
+
+import com.redhat.thermostat.jvm.overview.agent.VmUpdate;
+import com.redhat.thermostat.jvm.overview.agent.VmUpdateException;
+import org.junit.Test;
+import static org.junit.Assert.*;
+import org.junit.Before;
+import static org.mockito.Matchers.eq;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+public class VmClassloaderInfoExtractorTest {
+
+    private VmClassloaderInfoExtractor extractor;
+    private VmUpdate update;
+
+    @Before
+    public void setup() {
+        update = mock(VmUpdate.class);
+        extractor = new VmClassloaderInfoExtractor(update);
+    }
+
+    @Test
+    public void testClassesCount() throws VmUpdateException {
+        final String MONITOR_NAME = "java.cls.loadedClasses";
+        final Long MONITOR_VALUE = 300l;
+
+        when(update.getPerformanceCounterLong(eq(MONITOR_NAME))).thenReturn(MONITOR_VALUE);
+
+        Long returned = extractor.getLoadedClassesCount();
+        assertEquals(MONITOR_VALUE, returned);
+    }
+}