Java tutorial
/* ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (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.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is part of dcm4che, an implementation of DICOM(TM) in * Java(TM), hosted at http://sourceforge.net/projects/dcm4che. * * The Initial Developer of the Original Code is * Agfa-Gevaert AG. * Portions created by the Initial Developer are Copyright (C) 2008 * the Initial Developer. All Rights Reserved. * * Contributor(s): * See listed authors below. * * Alternatively, the contents of this file may be used under the terms of * either the GNU General Public License Version 2 or later (the "GPL"), or * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ package org.dcm4chee.web.common.delegate; import java.util.ArrayList; import java.util.List; import javax.management.MBeanServerConnection; import javax.management.MBeanServerFactory; import javax.management.MalformedObjectNameException; import javax.management.ObjectName; import org.apache.wicket.Application; import org.apache.wicket.protocol.http.WebApplication; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * @author Franz Willer <franz.willer@gmail.com> * @author Robert David <robert.david@agfa.com> * @version $Revision$ $Date$ * @since Aug 5, 2010 */ public class BaseCfgDelegate { protected static BaseCfgDelegate singleton; protected ObjectName serviceObjectName; protected MBeanServerConnection server; protected static Logger log = LoggerFactory.getLogger(BaseCfgDelegate.class); protected BaseCfgDelegate() { init(); } public static BaseCfgDelegate getInstance() { if (singleton == null) singleton = new BaseCfgDelegate(); return singleton; } public boolean getManageUsers() { return getBoolean("manageUsers", true); } public String getWebConfigPath() { return getString("WebConfigPath"); } public int[] getWindowSize(String name) { if (server == null) return new int[] { 800, 600 }; try { return (int[]) server.invoke(serviceObjectName, "getWindowSize", new Object[] { name }, new String[] { String.class.getName() }); } catch (Exception x) { log.warn("Cant invoke getWindowSize, using 800,600 as default!", x); return new int[] { 800, 600 }; } } public ObjectName getObjectName(String attrName, String defaultName) throws MalformedObjectNameException, NullPointerException { if (server == null) return defaultName == null ? null : new ObjectName(defaultName); try { return (ObjectName) server.getAttribute(serviceObjectName, attrName); } catch (Throwable t) { log.error("Can't get ObjectName for " + attrName + " ! use default:" + defaultName, t); return defaultName == null ? null : new ObjectName(defaultName); } } protected String getString(String attrName) { if (server == null) return null; try { return (String) server.getAttribute(serviceObjectName, attrName); } catch (Exception x) { log.warn("Cant get " + attrName + "! Ignored by return null!", x); return null; } } protected boolean getBoolean(String attrName, boolean defVal) { if (server == null) return defVal; try { return (Boolean) server.getAttribute(serviceObjectName, attrName); } catch (Exception x) { log.warn("Cant get " + attrName + " attribute! return " + defVal + " as default!", x); return defVal; } } protected Integer getInteger(String attrName, int defVal) { if (server == null) return null; try { return (Integer) server.getAttribute(serviceObjectName, attrName); } catch (Exception x) { log.warn("Cant get " + attrName + " attribute! return " + defVal + " as default!", x); return null; } } public Object invoke(String opName, Object[] args, Object defVal) { try { if (args == null) { args = new Object[] {}; } String[] argTypes = new String[args.length]; for (int i = 0; i < args.length; i++) { argTypes[i] = args.getClass().getName(); } return server.invoke(serviceObjectName, opName, args, argTypes); } catch (Exception x) { log.warn("Cant invoke " + opName + "! Return defVal:" + defVal, x); return defVal; } } protected void init() { log.info("Init " + getClass().getName()); List<?> servers = MBeanServerFactory.findMBeanServer(null); if (servers != null && !servers.isEmpty()) { server = (MBeanServerConnection) servers.get(0); log.debug("Found MBeanServer:" + server); } else { log.error("Failed to get MBeanServerConnection! MbeanDelegate class:" + getClass().getName()); return; } String s = ((WebApplication) Application.get()).getInitParameter("WebCfgServiceName"); if (s == null) s = "dcm4chee.web:service=WebConfig"; try { serviceObjectName = new ObjectName(s); log.info(getClass().getName() + " initialized! WebConfig serviceName: " + serviceObjectName); } catch (Exception e) { log.error("Failed to set ObjectName for " + getClass().getName() + "! name:" + s, e); } } public MBeanServerConnection getMBeanServer() { return server; } @SuppressWarnings("unchecked") protected List<String> getStringList(String name) { if (server == null) return new ArrayList<String>(); try { return (List<String>) server.invoke(serviceObjectName, name, new Object[] {}, new String[] {}); } catch (Exception e) { log.warn("Cant invoke '" + name + "', returning empty list.", e); return new ArrayList<String>(); } } @SuppressWarnings("unchecked") protected List<Integer> getIntegerList(String name, List<Integer> defValue) { if (server != null) { try { return (List<Integer>) server.invoke(serviceObjectName, name, new Object[] {}, new String[] {}); } catch (Exception e) { log.warn("Cant invoke '" + name + "', returning defValue:" + defValue, e); } } return defValue == null ? new ArrayList<Integer>() : defValue; } }