Examples of java.lang.reflect.InvocationHandler

java.lang.reflect.InvocationHandler
InvocationHandler is the interface implemented by the invocation handler of a proxy instance.
Each proxy instance has an associated invocation handler. When a method is invoked on a proxy instance, the method invocation is encoded and dispatched to the invoke method of its invocation handler. @author Peter Jones @version 1.11, 06/04/07 @see Proxy @since 1.3

   // Internal Helper Methods ------------------------------------------------------||
   // ------------------------------------------------------------------------------||


   protected StatefulProxyInvocationHandlerBase getInvocationHandler(Object proxy)
   {
      InvocationHandler handler = Proxy.getInvocationHandler(proxy);
      assert handler instanceof StatefulProxyInvocationHandlerBase : "Expected "
            + InvocationHandler.class.getSimpleName() + " of type "
            + StatefulProxyInvocationHandlerBase.class.getName() + ", but instead was " + handler;
      return (StatefulProxyInvocationHandlerBase) handler;
   }

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    * @param sessionId
    */
   protected void associateProxyWithSession(Object proxy, Serializable sessionId)
   {
      // Obtain the InvocationHandler
      InvocationHandler handler = Proxy.getInvocationHandler(proxy);
      assert handler instanceof StatefulProxyInvocationHandlerBase : "SFSB Proxy must be of type "
            + StatefulProxyInvocationHandlerBase.class.getName();
      StatefulProxyInvocationHandlerBase sHandler = (StatefulProxyInvocationHandlerBase) handler;


      // Set the Session ID on the Proxy

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      {
         // postpone the inevitable
         ClassLoader tccl = Thread.currentThread().getContextClassLoader();
         Class<?> interfaces[] =
         {Context.class};
         InvocationHandler handler = new InvocationHandler()
         {
            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable
            {
               try
               {

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               // Ensure we've got a Proxy
               assert Proxy.isProxyClass(proxyClass) : "Assumed Proxy is not an instance of " + Proxy.class.getName();


               // Get the InvocationHandler
               InvocationHandler handler = Proxy.getInvocationHandler(proxy);


               // Get the Interfaces
               Class<?>[] proxyInterfaces = proxyClass.getInterfaces();


               // Make a Set to hold the redefined classes

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  public <T> T getClient(final Class<T> asyncIfaceClass, final String connectionStr) {
    List<Connection> connections = BlurClientManager.getConnections(connectionStr);
    Collections.shuffle(connections, random);
    // randomness ftw
    final Connection connection = connections.get(0);
    return (T) Proxy.newProxyInstance(asyncIfaceClass.getClassLoader(), new Class[] { asyncIfaceClass }, new InvocationHandler() {
      @Override
      public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        return execute(new AsyncCall(asyncIfaceClass, method, args, connection));
      }
    });

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   * 
   * @throws SQLException if there is a problem
   */
  public Object loadResult() throws SQLException {
    if (Collection.class.isAssignableFrom(targetType)) {
      InvocationHandler handler = new LazyResultLoader(client, statementName, parameterObject, targetType);
      ClassLoader cl = targetType.getClassLoader();
      return Proxy.newProxyInstance(cl, LIST_INTERFACES, handler);
    } else {
      return ResultLoader.getResult(client, statementName, parameterObject, targetType);
    }

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   * @param stmt - the statement
   * @param sql - the sql statement
   * @return - the proxy
   */
  public static PreparedStatement newInstance(PreparedStatement stmt, String sql) {
    InvocationHandler handler = new PreparedStatementLogProxy(stmt, sql);
    ClassLoader cl = PreparedStatement.class.getClassLoader();
    return (PreparedStatement) Proxy.newProxyInstance(cl, new Class[]{PreparedStatement.class, CallableStatement.class}, handler);
  }

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   * Creates a logging version of a connection
   * @param conn - the original connection
   * @return - the connection with logging
   */
  public static Connection newInstance(Connection conn) {
    InvocationHandler handler = new ConnectionLogProxy(conn);
    ClassLoader cl = Connection.class.getClassLoader();
    return (Connection) Proxy.newProxyInstance(cl, new Class[]{Connection.class}, handler);
  }

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            // handle the deprecated sun case and other possible hidden API's 
            // that are similar to the Sun cases
            try {
                Method method = connection.getClass().getMethod("getHostnameVerifier");
                
                InvocationHandler handler = new ReflectionInvokationHandler(verifier) {
                    public Object invoke(Object proxy, 
                                         Method method, 
                                         Object[] args) throws Throwable {
                        try {
                            return super.invoke(proxy, method, args);

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      proxy = ((ProtocolTranslator) proxy).getUnderlyingProxyObject();
    }
    if (!Proxy.isProxyClass(proxy.getClass())) {
      return false;
    }
    final InvocationHandler ih = Proxy.getInvocationHandler(proxy);
    return ih instanceof RpcInvocationHandler;
  }

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