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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.handler.chain;
    21
    22  import org.apache.mina.core.session.DummySession;
    23  import org.apache.mina.core.session.IoSession;
    24  import org.junit.Test;
    25  import static org.junit.Assert.assertEquals;
    26
    27  /**
    28   * A test case for {@link ChainedIoHandler}.
    29   *
    30   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
    31   */
    32  public class ChainedIoHandlerTest {
    33      @Test
    34      public void testChainedCommand() throws Exception {
    35          IoHandlerChain chain = new IoHandlerChain();
    36          StringBuilder buf = new StringBuilder();
    37          chain.addLast("A", new TestCommand(buf, 'A'));
    38          chain.addLast("B", new TestCommand(buf, 'B'));
    39          chain.addLast("C", new TestCommand(buf, 'C'));
    40
    41          new ChainedIoHandler(chain).messageReceived(new DummySession(), null);
    42
    43          assertEquals("ABC", buf.toString());
    44      }
    45
    46      private class TestCommand implements IoHandlerCommand {
    47          private final StringBuilder buf;
    48
    49          private final char ch;
    50
    51          public TestCommand(StringBuilder buf, char ch) {
    52              this.buf = buf;
    53              this.ch = ch;
    54          }
    55
    56          public void execute(NextCommand next, IoSession session, Object message) throws Exception {
    57              buf.append(ch);
    58              next.execute(session, message);
    59          }
    60      }
    61  }