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.common.ByteBuffer;
23 import org.apache.mina.common.IoSession;
24
25 /**
26 * Decodes binary or protocol-specific data into higher-level message objects.
27 * MINA invokes {@link #decode(IoSession, ByteBuffer, ProtocolDecoderOutput)}
28 * method with read data, and then the decoder implementation puts decoded
29 * messages into {@link ProtocolDecoderOutput} by calling
30 * {@link ProtocolDecoderOutput#write(Object)}.
31 * <p>
32 * Please refer to
33 * <a href="../../../../../xref-examples/org/apache/mina/examples/reverser/TextLineDecoder.html"><code>TextLineDecoder</code></a>
34 * example.
35 *
36 * @author The Apache Directory Project (mina-dev@directory.apache.org)
37 * @version $Rev: 555855 $, $Date: 2007-07-13 12:19:00 +0900 (Fri, 13 Jul 2007) $
38 */
39 public interface ProtocolDecoder {
40 /**
41 * Decodes binary or protocol-specific content into higher-level message objects.
42 * MINA invokes {@link #decode(IoSession, ByteBuffer, ProtocolDecoderOutput)}
43 * method with read data, and then the decoder implementation puts decoded
44 * messages into {@link ProtocolDecoderOutput}.
45 *
46 * @throws Exception if the read data violated protocol specification
47 */
48 void decode(IoSession session, ByteBuffer in, ProtocolDecoderOutput out)
49 throws Exception;
50
51 /**
52 * Invoked when the specified <tt>session</tt> is closed. This method is useful
53 * when you deal with the protocol which doesn't specify the length of a message
54 * such as HTTP response without <tt>content-length</tt> header. Implement this
55 * method to process the remaining data that {@link #decode(IoSession, ByteBuffer, ProtocolDecoderOutput)}
56 * method didn't process completely.
57 *
58 * @throws Exception if the read data violated protocol specification
59 */
60 void finishDecode(IoSession session, ProtocolDecoderOutput out)
61 throws Exception;
62
63 /**
64 * Releases all resources related with this decoder.
65 *
66 * @throws Exception if failed to dispose all resources
67 */
68 void dispose(IoSession session) throws Exception;
69 }