cvs commit: ws-wsrp4j/sandbox/wsrp4j/commons/src/java/org/apache/wsrp4j/commons/persistence/driver PersistentAccess.java

[dl...@apache.org]

dlouzan     2005/08/22 12:05:33

  Added:       sandbox/wsrp4j/commons/src/java/org/apache/wsrp4j/commons/persistence/driver
                        PersistentAccess.java
  Log:
  Initial commit.
  
  Revision  Changes    Path
  1.1                  ws-wsrp4j/sandbox/wsrp4j/commons/src/java/org/apache/wsrp4j/commons/persistence/driver/PersistentAccess.java
  
  Index: PersistentAccess.java
  ===================================================================
  /*
   * Copyright 2003-2005 The Apache Software Foundation.
   * 
   * Licensed 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.wsrp4j.commons.persistence.driver;
  
  import java.io.InputStream;
  import java.util.Properties;
  
  import org.apache.wsrp4j.commons.exception.ErrorCodes;
  import org.apache.wsrp4j.commons.exception.WSRPException;
  import org.apache.wsrp4j.commons.exception.WSRPXHelper;
  import org.apache.wsrp4j.commons.log.LogManager;
  import org.apache.wsrp4j.commons.log.Logger;
  import org.apache.wsrp4j.commons.persistence.ClientPersistentFactory;
  import org.apache.wsrp4j.commons.persistence.ServerPersistentFactory;
  
  
  /**
   * This class provides a static method to access the client and server
   * persistent factories.It reads in the file "WSRPServices.properties" 
   * for the server and the file "SwingConsumer.properties" for a client.
   *
   * @author  <a href="mailto:Ralf.Altrichter@de.ibm.com">Ralf Altrichter</a>
   *
   * @version $Id: PersistentAccess.java,v 1.1 2005/08/22 19:05:33 dlouzan Exp $
   */
  public class PersistentAccess
  {
  
      // the name of the .properties file for the server
      private static String WSRP_SERVICES = "WSRPServices.properties";
  
      // the name of the .properties file for the client
      private static String CLIENT = "SwingConsumer.properties";
  
      // property name of the server factory
      private static String SERVER_PERSISTENT_FACTORY = 
              "server.persistent.factory";
  
      // property name of the client factory
      private static String CLIENT_PERSISTENT_FACTORY = 
              "client.persistent.factory";
  
      // the content of the properties file
      private static Properties pFactories = null;
  
      // holds the instance of the server factory after initializing
      private static ServerPersistentFactory serverPersistentFactory;
  
      // holds the instance of the client factory after initializing
      private static ClientPersistentFactory clientPersistentFactory;
  
      // log and trace support
      private static Logger logger = 
              LogManager.getLogManager().getLogger(getThisClass());
  
      /**
       * Fetches a server factory-instance.
       *
       * @return ServerPersistentFactory
       * @throws WSRPException
       */
      public static ServerPersistentFactory getServerPersistentFactory() 
      throws WSRPException
      {
          String MN = "getServerPersistentFactory";
          if (logger.isLogging(Logger.TRACE_HIGH))
          {
              logger.entry(Logger.TRACE_HIGH, MN);
          }
  
          if (serverPersistentFactory == null)
          {
              serverPersistentFactory = (ServerPersistentFactory) getFactory(
                      SERVER_PERSISTENT_FACTORY,WSRP_SERVICES);
          }
  
          if (logger.isLogging(Logger.TRACE_HIGH))
          {
              logger.exit(Logger.TRACE_HIGH, MN);
          }
  
          return serverPersistentFactory;
      }
  
      /**
       * Fetches a client factory-instance.
       *
       * @return ClientPersistentFactory
       * @throws WSRPException
       */
      public static ClientPersistentFactory getClientPersistentFactory() 
      throws WSRPException
      {
          String MN = "getClientPersistentFactory";
          if (logger.isLogging(Logger.TRACE_HIGH))
          {
              logger.entry(Logger.TRACE_HIGH, MN);
          }
  
          if (clientPersistentFactory == null)
          {
              clientPersistentFactory = (ClientPersistentFactory) getFactory(
                      CLIENT_PERSISTENT_FACTORY,CLIENT);
          }
  
          if (logger.isLogging(Logger.TRACE_HIGH))
          {
              logger.exit(Logger.TRACE_HIGH, MN);
          }
  
          return clientPersistentFactory;
      }
  
  
      /**
       * Returns the factory loaded from the properties file.
       * 
       * @param type of the factory as string value
       * @param propertyFile name of the property file as string value
       * @throws WSRPException
       */
      private static Object getFactory(String type,String propertyFile) 
      throws WSRPException
      {
          String MN = "getFactory";
          if (logger.isLogging(Logger.TRACE_HIGH))
          {
              logger.entry(Logger.TRACE_HIGH, MN);
          }
  
          Object obj = null;
  
          try
          {
              loadPropertyFile(propertyFile);
  
              String factoryName = (String)pFactories.get(type);
  
              Class cl = Class.forName(factoryName);
  
              if (logger.isLogging(Logger.TRACE_HIGH))
              {
                  logger.exit(Logger.TRACE_HIGH, MN);
              }
  
              obj = cl.newInstance();
  
          } catch (Exception e)
          {
              WSRPXHelper.throwX(logger, Logger.ERROR, MN, 
                      ErrorCodes.PERSISTENT_FACTORY_NOT_FOUND);
          }
  
          return obj;
      }
  
      /**
       * Loads the content of a properties file into a private Properties object. 
       * The properties file to load contains the factory information.
       * 
       * @param propertyFile name of the property file as string value
       * @throws WSRPException
       */
      private static void loadPropertyFile(String propertyFile) 
      throws WSRPException
      {
  
          String MN = "loadPropertyFile";
          if (logger.isLogging(Logger.TRACE_HIGH))
          {
              logger.entry(Logger.TRACE_HIGH, MN);
          }
  
          try
          {
              // read in .properties-file
              InputStream in = getThisClass().getClassLoader().
                      getResourceAsStream(propertyFile);
              pFactories = new Properties();
              pFactories.load(in);
  
          } catch (Exception e)
          {
              WSRPXHelper.throwX(logger, Logger.ERROR, MN, 
                      ErrorCodes.PROPERTY_FILE_NOT_FOUND);
          }
      }
  
  
      /**
       * Returns the class object of PersistentrAccess
       * 
       * @return java.lang.Class
       */
      private static Class getThisClass()
      {
  
          return PersistentAccess.class;
  
      }
  }