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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.filter.codec;
    21
    22  import org.apache.mina.filter.codec.demux.MessageDecoderResult;
    23  import org.apache.mina.filter.codec.demux.MessageDecoderAdapter;
    24  import org.apache.mina.filter.codec.demux.DemuxingProtocolDecoder;
    25  import org.apache.mina.filter.codec.ProtocolDecoderOutput;
    26  import org.apache.mina.core.session.IoSession;
    27  import org.apache.mina.core.session.DummySession;
    28  import org.apache.mina.core.buffer.IoBuffer;
    29  import org.apache.mina.core.service.DefaultTransportMetadata;
    30  import org.apache.mina.core.file.FileRegion;
    31  import org.apache.mina.transport.socket.SocketSessionConfig;
    32  import org.easymock.EasyMock;
    33  import org.junit.Test;
    34
    35  import java.net.InetSocketAddress;
    36  import java.nio.charset.Charset;
    37
    38  /**
    39   * Simple Unit Test showing that the DemuxingProtocolDecoder has
    40   * inconsistent behavior if used with a non fragmented transport.
    41   *
    42   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
    43  */
    44  public class DemuxingProtocolDecoderBugTest {
    45
    46      private static void doTest(IoSession session) throws Exception {
    47          ProtocolDecoderOutput mock = EasyMock.createMock(ProtocolDecoderOutput.class);
    48          mock.write(Character.valueOf('A'));
    49          mock.write(Character.valueOf('B'));
    50          mock.write(Integer.valueOf(1));
    51          mock.write(Integer.valueOf(2));
    52          mock.write(Character.valueOf('C'));
    53          EasyMock.replay(mock);
    54
    55          IoBuffer buffer = IoBuffer.allocate(1000);
    56          buffer.putString("AB12C", Charset.defaultCharset().newEncoder());
    57          buffer.flip();
    58
    59          DemuxingProtocolDecoder decoder = new DemuxingProtocolDecoder();
    60          decoder.addMessageDecoder(CharacterMessageDecoder.class);
    61          decoder.addMessageDecoder(IntegerMessageDecoder.class);
    62
    63          decoder.decode(session, buffer, mock);
    64
    65          EasyMock.verify(mock);
    66      }
    67
    68      public static class CharacterMessageDecoder extends MessageDecoderAdapter {
    69          public MessageDecoderResult decodable(IoSession session, IoBuffer in) {
    70              return Character.isDigit((char) in.get()) ? MessageDecoderResult.NOT_OK : MessageDecoderResult.OK;
    71          }
    72
    73          public MessageDecoderResult decode(IoSession session, IoBuffer in, ProtocolDecoderOutput out) throws Exception {
    74              out.write(Character.valueOf((char) in.get()));
    75              return MessageDecoderResult.OK;
    76          }
    77      }
    78
    79      public static class IntegerMessageDecoder extends MessageDecoderAdapter {
    80          public MessageDecoderResult decodable(IoSession session, IoBuffer in) {
    81              return Character.isDigit((char) in.get()) ? MessageDecoderResult.OK : MessageDecoderResult.NOT_OK;
    82          }
    83
    84          public MessageDecoderResult decode(IoSession session, IoBuffer in, ProtocolDecoderOutput out) throws Exception {
    85              out.write(Integer.parseInt("" + (char) in.get()));
    86              return MessageDecoderResult.OK;
    87          }
    88      }
    89
    90      private static class SessionStub extends DummySession {
    91          public SessionStub(boolean fragmented) {
    92              setTransportMetadata(new DefaultTransportMetadata("nio", "socket", false, fragmented,
    93                      InetSocketAddress.class, SocketSessionConfig.class, IoBuffer.class, FileRegion.class));
    94          }
    95      }
    96
    97      /**
    98       * Test a decoding with fragmentation
    99       */
    100     @Test
    101     public void testFragmentedTransport() throws Exception {
    102         doTest(new SessionStub(true));
    103     }
    104
    105     /**
    106      * Test a decoding without fragmentation
    107      */
    108     @Test
    109     public void testNonFragmentedTransport() throws Exception {
    110         doTest(new SessionStub(false));
    111     }
    112 }