create special version of JmxModel when jmx application is not connected (state != STATE_AVAILABLE)

Author: thurka

visualvm/jmx/src/org/graalvm/visualvm/jmx/impl/DisconnectedJmxModel.java

@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 2007, 2020, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package org.graalvm.visualvm.jmx.impl;
+
+import java.util.Properties;
+import javax.management.MBeanServerConnection;
+import javax.management.remote.JMXServiceURL;
+import org.graalvm.visualvm.application.jvm.HeapHistogram;
+import org.graalvm.visualvm.tools.jmx.JmxModel;
+
+/**
+ *
+ * @author Tomas Hurka
+ */
+class DisconnectedJmxModel extends JmxModel {
+
+    private final JMXServiceURL url;
+
+    DisconnectedJmxModel(JmxApplication app) {
+        url = app.getJMXServiceURL();
+    }
+
+    @Override
+    public ConnectionState getConnectionState() {
+        return ConnectionState.DISCONNECTED;
+    }
+
+    @Override
+    public MBeanServerConnection getMBeanServerConnection() {
+        return null;
+    }
+
+    @Override
+    public JMXServiceURL getJMXServiceURL() {
+        return url;
+    }
+
+    @Override
+    public Properties getSystemProperties() {
+        return null;
+    }
+
+    @Override
+    public boolean isTakeHeapDumpSupported() {
+        return false;
+    }
+
+    @Override
+    public boolean takeHeapDump(String fileName) {
+        return false;
+    }
+
+    @Override
+    public boolean isTakeThreadDumpSupported() {
+        return false;
+    }
+
+    @Override
+    public String takeThreadDump() {
+        return null;
+    }
+
+    @Override
+    public String takeThreadDump(long[] threadIds) {
+        return null;
+    }
+
+    @Override
+    public HeapHistogram takeHeapHistogram() {
+        return null;
+    }
+
+    @Override
+    public String getFlagValue(String name) {
+        return null;
+    }
+
+    @Override
+    public void setFlagValue(String name, String value) {
+    }
+
+    @Override
+    public String getCommandLine() {
+        return null;
+    }
+}

visualvm/jmx/src/org/graalvm/visualvm/jmx/impl/JmxModelProvider.java

@@ -28,6 +28,7 @@
 import org.graalvm.visualvm.core.model.AbstractModelProvider;
 import org.graalvm.visualvm.core.model.ModelProvider;
 import org.graalvm.visualvm.application.Application;
+import org.graalvm.visualvm.core.datasupport.Stateful;
 import org.graalvm.visualvm.tools.jmx.JmxModel;
 import org.graalvm.visualvm.tools.jvmstat.JvmstatModel;
 import org.graalvm.visualvm.tools.jvmstat.JvmstatModelFactory;
@@ -57,7 +58,9 @@ public JmxModel createModelFor(Application app) {
         JvmstatModel jvmstat;
 
         if (app instanceof JmxApplication) {
-            return new JmxModelImpl((JmxApplication) app);
+            if (app.getState() == Stateful.STATE_AVAILABLE)
+                return new JmxModelImpl((JmxApplication) app);
+            return new DisconnectedJmxModel((JmxApplication) app);
         }
         jvmstat = JvmstatModelFactory.getJvmstatFor(app);
         if (jvmstat != null) {