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NetXMS client library - complete JAVA API
There is a newer version: 5.0.6
/**
 * NetXMS - open source network management system
 * Copyright (C) 2003-2014 Victor Kirhenshtein
 *
 * This program 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 of the License, or
 * (at your option) any later version.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
package org.netxms.client.services;

import java.util.HashMap;
import java.util.Map;
import java.util.ServiceLoader;

/**
 * Manager for client services
 */
public final class ServiceManager
{
   private static Map> serviceLoaders = new HashMap>();
   
   /**
    * Reload service providers
    */
   public static synchronized void registerClassLoader(ClassLoader classLoader)
   {
      ServiceLoader serviceLoader = serviceLoaders.get(classLoader);
      if (serviceLoader != null)
      {
         serviceLoader.reload();
      }
      else
      {
         serviceLoaders.put(classLoader, ServiceLoader.load(ServiceHandler.class, classLoader));
      }
   }
   
   /**
    * Get service handler by name and check if handler class is correct.
    * 
    * @param name service name
    * @param serviceClass service handler class
    * @return service handler for given service
    */
   public static synchronized ServiceHandler getServiceHandler(String name, Class serviceClass)
   {
      for(ServiceLoader loader : serviceLoaders.values())
      {
         for(ServiceHandler s : loader)
            if (s.getServiceName().equals(name) && serviceClass.isInstance(s))
               return s;
      }
      return null;
   }
   
   /**
    * Get service handler by name
    * 
    * @param name service name
    * @return service handler for given service
    */
   public static synchronized ServiceHandler getServiceHandler(String name)
   {
      for(ServiceLoader loader : serviceLoaders.values())
      {
         for(ServiceHandler s : loader)
            if (s.getServiceName().equals(name))
               return s;
      }
      return null;
   }
   
   /**
    * Get service handler by class
    * 
    * @param serviceClass service handler class
    * @return service handler for given service
    */
   public static synchronized ServiceHandler getServiceHandler(Class serviceClass)
   {
      for(ServiceLoader loader : serviceLoaders.values())
      {
         for(ServiceHandler s : loader)
            if (serviceClass.isInstance(s))
               return s;
      }
      return null;
   }
   
   /**
    * Debug method to dump all registered services
    */
   public static synchronized void dump()
   {
      for(ServiceLoader loader : serviceLoaders.values())
      {
         for(ServiceHandler s : loader)
            System.out.println(s.getServiceName());
      }
   }
}