Java tutorial
/* * NOTE: This copyright does *not* cover user programs that use HQ * program services by normal system calls through the application * program interfaces provided as part of the Hyperic Plug-in Development * Kit or the Hyperic Client Development Kit - this is merely considered * normal use of the program, and does *not* fall under the heading of * "derived work". * * Copyright (C) [2004, 2005, 2006], Hyperic, Inc. * This file is part of HQ. * * HQ is free software; you can redistribute it and/or modify * it under the terms version 2 of the GNU General Public License as * published by the Free Software Foundation. This program 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 this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 * USA. */ package org.hyperic.hq.product.jmx; import java.io.IOException; import java.rmi.RemoteException; import java.util.Arrays; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.Properties; import javax.management.Attribute; import javax.management.AttributeList; import javax.management.InstanceNotFoundException; import javax.management.MBeanServerConnection; import javax.management.MalformedObjectNameException; import javax.management.ObjectName; import javax.management.ReflectionException; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.hyperic.hq.product.PluginException; import org.hyperic.hq.product.ServerDetector; import org.hyperic.util.config.ConfigSchema; public abstract class MxQuery { public static final String PROP_OBJECT_NAME = "OBJECT_NAME"; public static final String PROP_ATTRIBUTE_NAME = "ATTRIBUTE_NAME"; public static final String PROP_MBEAN_CLASS = "MBEAN_CLASS"; public static final String PROP_OBJECT_NAME_FILTER = "OBJECT_NAME_FILTER"; protected static final Properties EMPTY_PROPERTIES = new Properties(); protected static final Log log = LogFactory.getLog(MxQuery.class); private Map attrs = new HashMap(); private String name; private String url = null; private ServerDetector detector = null; protected ObjectName objectName; private Properties cprops; public void initialize() { } void setObjectName(ObjectName objectName) { this.objectName = objectName; } public ObjectName getObjectName() { return objectName; } public Properties getCustomProperties() { return this.cprops; } public String[] getAttributeNames() { String type = getResourceType(); ConfigSchema schema = this.getServerDetector().getCustomPropertiesSchema(type); return schema.getOptionNames(); } public void getAttributes(MBeanServerConnection mServer) throws PluginException { String[] names = getAttributeNames(); if (names.length == 0) { this.cprops = EMPTY_PROPERTIES; return; } for (int i = 0; i < names.length; i++) { String name = names[i]; ObjectName objName; int ix = name.lastIndexOf(':'); if (ix == -1) { //"serverVersion" objName = getObjectName(); } else { //domain:Key=Val:serverVersion try { objName = new ObjectName(name.substring(0, ix)); } catch (MalformedObjectNameException e) { throw new PluginException(name, e); } name = name.substring(ix + 1); } Object value; try { value = mServer.getAttribute(objName, name); } catch (Exception e) { log.debug("getAttribute(" + objName + ", " + name + ") failed", e); continue; } if (value != null) { String stringValue; if (value instanceof Object[]) { stringValue = Arrays.asList((Object[]) value).toString(); } else { stringValue = value.toString(); } setAttribute(names[i], stringValue); } else { // Show 'Attribute was null' in UI. log.debug("getAttribute(" + objName + ", " + name + ") returned null"); setAttribute(names[i], "Attribute was null"); } } this.cprops = new Properties(); this.cprops.putAll(this.attrs); } public void setURL(String url) { this.url = url; } public String getURL() { if (this.url == null) { return this.getParent().getURL(); } return this.url; } public void setServerDetector(ServerDetector detector) { this.detector = detector; } public ServerDetector getServerDetector() { if (this.detector == null) { return this.getParent().getServerDetector(); } return this.detector; } public void getAttributes(MBeanServerConnection mServer, ObjectName name, String[] attrs) throws PluginException { if (attrs.length == 0) { return; } AttributeList mBeanAttrs; try { mBeanAttrs = mServer.getAttributes(name, attrs); } catch (RemoteException e) { throw new PluginException("Cannot connect to server", e); } catch (InstanceNotFoundException e) { throw new PluginException("Cannot find MBean [" + name + "]", e); } catch (ReflectionException e) { throw new PluginException("MBean reflection exception", e); } catch (IOException e) { throw new PluginException("Cannot connect to server", e); } for (Iterator it = mBeanAttrs.iterator(); it.hasNext();) { Attribute attr = (Attribute) it.next(); Object value = attr.getValue(); if (value != null) { setAttribute(attr.getName(), value.toString()); } } } public String getAttribute(String name) { return (String) attrs.get(name); } public String getAttribute(String name, String defval) { String attr = getAttribute(name); if (attr == null) { return defval; } return attr; } public void setAttribute(String name, String val) { this.attrs.put(name, val); } public String getName() { return this.name; } public void setName(String name) { this.name = name; } public abstract String getQualifiedName(); public abstract String getResourceType(); public abstract String getIdentifier(); public MxQuery getParent() { // services should override return null; } public boolean hasControl() { return true; } public Properties getResourceConfig() { return EMPTY_PROPERTIES; } public Properties getControlConfig() { return EMPTY_PROPERTIES; } }