1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.commons.net.discard;
19
20 import java.io.IOException;
21 import java.net.DatagramPacket;
22 import java.net.InetAddress;
23
24 import org.apache.commons.net.DatagramSocketClient;
25
26 /***
27 * The DiscardUDPClient class is a UDP implementation of a client for the
28 * Discard protocol described in RFC 863. To use the class,
29 * just open a local UDP port
30 * with {@link org.apache.commons.net.DatagramSocketClient#open open }
31 * and call {@link #send send } to send datagrams to the server
32 * After you're done sending discard data, call
33 * {@link org.apache.commons.net.DatagramSocketClient#close close() }
34 * to clean up properly.
35 * <p>
36 * <p>
37 * @author Daniel F. Savarese
38 * @see DiscardTCPClient
39 ***/
40
41 public class DiscardUDPClient extends DatagramSocketClient
42 {
43 /*** The default discard port. It is set to 9 according to RFC 863. ***/
44 public static final int DEFAULT_PORT = 9;
45
46 DatagramPacket _sendPacket;
47
48 public DiscardUDPClient()
49 {
50 _sendPacket = new DatagramPacket(new byte[0], 0);
51 }
52
53
54 /***
55 * Sends the specified data to the specified server at the specified port.
56 * <p>
57 * @param data The discard data to send.
58 * @param length The length of the data to send. Should be less than
59 * or equal to the length of the data byte array.
60 * @param host The address of the server.
61 * @param port The service port.
62 * @exception IOException If an error occurs during the datagram send
63 * operation.
64 ***/
65 public void send(byte[] data, int length, InetAddress host, int port)
66 throws IOException
67 {
68 _sendPacket.setData(data);
69 _sendPacket.setLength(length);
70 _sendPacket.setAddress(host);
71 _sendPacket.setPort(port);
72 _socket_.send(_sendPacket);
73 }
74
75
76 /***
77 * Same as
78 * <code>send(data, length, host. DiscardUDPClient.DEFAULT_PORT)</code>.
79 ***/
80 public void send(byte[] data, int length, InetAddress host)
81 throws IOException
82 {
83 send(data, length, host, DEFAULT_PORT);
84 }
85
86
87 /***
88 * Same as
89 * <code>send(data, data.length, host. DiscardUDPClient.DEFAULT_PORT)</code>.
90 ***/
91 public void send(byte[] data, InetAddress host) throws IOException
92 {
93 send(data, data.length, host, DEFAULT_PORT);
94 }
95
96 }
97