diff options
Diffstat (limited to 'qpid/java/management/client/src/main/java/org/apache/qpid/management/web/action/JmxPerspectiveAction.java')
| -rw-r--r-- | qpid/java/management/client/src/main/java/org/apache/qpid/management/web/action/JmxPerspectiveAction.java | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/qpid/java/management/client/src/main/java/org/apache/qpid/management/web/action/JmxPerspectiveAction.java b/qpid/java/management/client/src/main/java/org/apache/qpid/management/web/action/JmxPerspectiveAction.java new file mode 100644 index 0000000000..59777cc9c8 --- /dev/null +++ b/qpid/java/management/client/src/main/java/org/apache/qpid/management/web/action/JmxPerspectiveAction.java @@ -0,0 +1,189 @@ +/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+package org.apache.qpid.management.web.action;
+
+import java.io.IOException;
+import java.lang.management.ManagementFactory;
+import java.util.HashMap;
+import java.util.Hashtable;
+import java.util.Map;
+import java.util.Properties;
+import java.util.Map.Entry;
+
+import javax.management.MBeanAttributeInfo;
+import javax.management.MBeanInfo;
+import javax.management.MBeanServer;
+import javax.management.MalformedObjectNameException;
+import javax.management.ObjectName;
+import javax.servlet.RequestDispatcher;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+/**
+ * This controller is responsible to provide a jmx perspective of a specific resource.
+ * That means that this controller is querying the Platform MBean server in order to
+ * get metadata for the requested mbean.
+ *
+ * After that metadata will be forwarded to the appropriate view page and therefore
+ * will be shown on the Admin console.
+ *
+ * @author Andrea Gazzarini
+ */
+public class JmxPerspectiveAction extends HttpServlet
+{
+ private static final long serialVersionUID = -2411413147821629363L;
+
+ /**
+ * Adapter interface for converting objects on html strings.
+ *
+ * @author Andrea Gazzarini.
+ */
+ interface JavaToHtmlAdapter
+ {
+ /**
+ * Returns an HTML string representation of the given object.
+ *
+ * @param javaObject the object that needs to be converted.
+ * @return an html string containing value of the given object.
+ */
+ String toHtml(Object javaObject);
+ }
+
+ /**
+ * Adapter implementation for Map (and subclasses).
+ */
+ private JavaToHtmlAdapter mapAdapter = new JavaToHtmlAdapter()
+ {
+ @SuppressWarnings("unchecked")
+ public String toHtml(Object javaObject)
+ {
+ Map<String,Object> value = (Map<String, Object>) javaObject;
+
+ // Sanity check : if the map is empty or null there's no need to
+ // do any convertion
+ if (value == null || value.isEmpty())
+ {
+ return "(empty)";
+ }
+
+ StringBuilder builder = new StringBuilder("<ul>");
+ for (Entry<String, Object> entry : value.entrySet())
+ {
+ builder
+ .append("<li>")
+ .append(entry.getKey())
+ .append(" = ")
+ .append(entry.getValue());
+ }
+ builder.append("</ul>");
+ return builder.toString();
+ }
+ };
+
+ private Map<String, JavaToHtmlAdapter> _adapters = new HashMap<String, JavaToHtmlAdapter>();
+
+ @Override
+ public void init() throws ServletException
+ {
+ _adapters.put(Map.class.getName(), mapAdapter);
+ _adapters.put(HashMap.class.getName(),mapAdapter);
+ _adapters.put(Properties.class.getName(),mapAdapter);
+ _adapters.put(Hashtable.class.getName(),mapAdapter);
+ }
+
+ @SuppressWarnings("unchecked")
+ @Override
+ protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
+ {
+ String resourceId = null;
+ try
+ {
+ resourceId = request.getParameter("resourceId");
+
+ ObjectName objectName = new ObjectName(resourceId);
+ String [] keyProperties = objectName.getKeyPropertyListString().split(",");
+
+ MBeanServer server = ManagementFactory.getPlatformMBeanServer();
+
+ MBeanInfo metadata = server.getMBeanInfo(objectName);
+
+ Map<String, String> attributes = getAttributes(server, objectName,metadata.getAttributes());
+
+ request.setAttribute("resourceId", objectName);
+ request.setAttribute("metadata",metadata);
+ request.setAttribute("nameAttributes",keyProperties);
+ request.setAttribute("attributes",attributes);
+
+ RequestDispatcher dispatcher = request.getRequestDispatcher("/jmx_perspective.jsp");
+ dispatcher.forward(request,response);
+ } catch(MalformedObjectNameException exception)
+ {
+ request.setAttribute("errorMessage","Malformed Resource ID : supplied value is "+resourceId);
+ request.setAttribute("exception",exception);
+ RequestDispatcher dispatcher = request.getRequestDispatcher("/error_page.jsp");
+ dispatcher.forward(request,response);
+
+ }
+ catch(Exception exception)
+ {
+ request.setAttribute("errorMessage","Unable to detect the exact cause Please look at the reported stack trace below.");
+ request.setAttribute("exception",exception);
+ RequestDispatcher dispatcher = request.getRequestDispatcher("/error_page.jsp");
+ dispatcher.forward(request,response);
+ }
+ }
+
+ /**
+ * Starting from an mbean metadata, this method retrieves all the attributes
+ * from the corresponding MBean Server.
+ *
+ * @param server the mbean server where the target mbean is registered.
+ * @param name the name of the target mbean.
+ * @param metadata the metadata of mbean.
+ * @return a map containing all attributes of the given mbean.
+ * @throws Exception when it's not possible to retrieve attributes.
+ */
+ private Map<String, String> getAttributes(MBeanServer server, ObjectName name, MBeanAttributeInfo [] metadata) throws Exception
+ {
+ Map<String,String> result = new HashMap<String, String>(metadata.length);
+ for (MBeanAttributeInfo attribute : metadata)
+ {
+ Object value = server.getAttribute(name, attribute.getName());
+ result.put(attribute.getName(),getAdaptedValue(attribute.getType(), value));
+ }
+ return result;
+ }
+
+ /**
+ * Converts the given attribute value in a html string format.
+ *
+ * @param type the java type of the given attribute value.
+ * @param value the attribute value.
+ * @return a html string format of the given value.
+ */
+ private String getAdaptedValue(String type, Object value)
+ {
+ JavaToHtmlAdapter adapter = _adapters.get(type);
+ return (adapter != null) ? adapter.toHtml(value) : String.valueOf(value);
+ }
+}
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