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 }