transactionmanagerfinder.java

高级java2 大学教程(含源码,经典的Java学习教程

// Fig: TransactionManagerFinder.java
// This application unicast discovers the 
// TransactionManager service.
package com.deitel.advjhtp1.javaspace.common;

// Jini core packages
import net.jini.core.discovery.LookupLocator;
import net.jini.core.lookup.*;
import net.jini.core.entry.Entry;
import net.jini.core.transaction.server.TransactionManager;

// Java core packages
import java.io.*;
import java.rmi.RMISecurityManager;
import java.net.*;

// Java extension package
import javax.swing.*;

public class TransactionManagerFinder {

   private TransactionManager transactionManager = null;

   public TransactionManagerFinder( String jiniURL )
   {
      LookupLocator locator = null;
      ServiceRegistrar registrar = null;

      System.setSecurityManager( new RMISecurityManager() );

      // get the lookup service locator at "jini://hostname" 
      // use default port
      try {
         locator = new LookupLocator( jiniURL );

         // get the registrar for the locator
         registrar = locator.getRegistrar();

         // specify the service requirement
         Class[] types = new Class[] { 
            TransactionManager.class };
         ServiceTemplate template = 
            new ServiceTemplate( null, types, null );
     
         // find the service       
         transactionManager = 
            (TransactionManager) registrar.lookup( template );
      } 
 
      // handle exception invalid jini URL
      catch ( MalformedURLException malformedURLException ) {
         malformedURLException.printStackTrace();
      }
       
      // handle exception I/O
      catch ( IOException ioException ) {
         ioException.printStackTrace();
      }
 
      // handle exception finding class
      catch ( ClassNotFoundException classNotFoundException ) {
         classNotFoundException.printStackTrace();
      }
 
      // does not find any matching service
      if ( transactionManager == null ) {
         System.out.println( "No matching service" );
      }

   } // end TransactionManagerFinder constructor

   public TransactionManager getTransactionManager()
   {
      return transactionManager;
   }
} 

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