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    1   /*
    2    *  Licensed to the Apache Software Foundation (ASF) under one
    3    *  or more contributor license agreements.  See the NOTICE file
    4    *  distributed with this work for additional information
    5    *  regarding copyright ownership.  The ASF licenses this file
    6    *  to you under the Apache License, Version 2.0 (the
    7    *  "License"); you may not use this file except in compliance
    8    *  with the License.  You may obtain a copy of the License at
    9    *
    10   *    http://www.apache.org/licenses/LICENSE-2.0
    11   *
    12   *  Unless required by applicable law or agreed to in writing,
    13   *  software distributed under the License is distributed on an
    14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    15   *  KIND, either express or implied.  See the License for the
    16   *  specific language governing permissions and limitations
    17   *  under the License.
    18   *
    19   */
    20  package org.apache.mina.example.proxy;
    21
    22  import java.nio.charset.Charset;
    23
    24  import org.apache.mina.core.buffer.IoBuffer;
    25  import org.apache.mina.core.service.IoHandlerAdapter;
    26  import org.apache.mina.core.session.IoSession;
    27  import org.slf4j.Logger;
    28  import org.slf4j.LoggerFactory;
    29
    30  /**
    31   * Base class of {@link org.apache.mina.core.service.IoHandler} classes which handle
    32   * proxied connections.
    33   *
    34   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
    35   */
    36  public abstract class AbstractProxyIoHandler extends IoHandlerAdapter {
    37      private static final Charset CHARSET = Charset.forName("iso8859-1");
    38      public static final String OTHER_IO_SESSION = AbstractProxyIoHandler.class.getName()+".OtherIoSession";
    39
    40      private final static Logger LOGGER = LoggerFactory.getLogger(AbstractProxyIoHandler.class);
    41
    42      @Override
    43      public void sessionCreated(IoSession session) throws Exception {
    44          session.suspendRead();
    45          session.suspendWrite();
    46      }
    47
    48      @Override
    49      public void sessionClosed(IoSession session) throws Exception {
    50          if (session.getAttribute( OTHER_IO_SESSION ) != null) {
    51              IoSession sess = (IoSession) session.getAttribute(OTHER_IO_SESSION);
    52              sess.setAttribute(OTHER_IO_SESSION, null);
    53              sess.close(false);
    54              session.setAttribute(OTHER_IO_SESSION, null);
    55          }
    56      }
    57
    58      @Override
    59      public void messageReceived(IoSession session, Object message)
    60              throws Exception {
    61          IoBuffer rb = (IoBuffer) message;
    62          IoBuffer wb = IoBuffer.allocate(rb.remaining());
    63          rb.mark();
    64          wb.put(rb);
    65          wb.flip();
    66          ((IoSession) session.getAttribute(OTHER_IO_SESSION)).write(wb);
    67          rb.reset();
    68          LOGGER.info(rb.getString(CHARSET.newDecoder()));
    69      }
    70  }