001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 018 package org.apache.commons.net.discard; 019 020 import java.io.IOException; 021 import java.net.DatagramPacket; 022 import java.net.InetAddress; 023 024 import org.apache.commons.net.DatagramSocketClient; 025 026 /*** 027 * The DiscardUDPClient class is a UDP implementation of a client for the 028 * Discard protocol described in RFC 863. To use the class, 029 * just open a local UDP port 030 * with {@link org.apache.commons.net.DatagramSocketClient#open open } 031 * and call {@link #send send } to send datagrams to the server 032 * After you're done sending discard data, call 033 * {@link org.apache.commons.net.DatagramSocketClient#close close() } 034 * to clean up properly. 035 * <p> 036 * <p> 037 * @author Daniel F. Savarese 038 * @see DiscardTCPClient 039 ***/ 040 041 public class DiscardUDPClient extends DatagramSocketClient 042 { 043 /*** The default discard port. It is set to 9 according to RFC 863. ***/ 044 public static final int DEFAULT_PORT = 9; 045 046 DatagramPacket _sendPacket; 047 048 public DiscardUDPClient() 049 { 050 _sendPacket = new DatagramPacket(new byte[0], 0); 051 } 052 053 054 /*** 055 * Sends the specified data to the specified server at the specified port. 056 * <p> 057 * @param data The discard data to send. 058 * @param length The length of the data to send. Should be less than 059 * or equal to the length of the data byte array. 060 * @param host The address of the server. 061 * @param port The service port. 062 * @exception IOException If an error occurs during the datagram send 063 * operation. 064 ***/ 065 public void send(byte[] data, int length, InetAddress host, int port) 066 throws IOException 067 { 068 _sendPacket.setData(data); 069 _sendPacket.setLength(length); 070 _sendPacket.setAddress(host); 071 _sendPacket.setPort(port); 072 _socket_.send(_sendPacket); 073 } 074 075 076 /*** 077 * Same as 078 * <code>send(data, length, host. DiscardUDPClient.DEFAULT_PORT)</code>. 079 ***/ 080 public void send(byte[] data, int length, InetAddress host) 081 throws IOException 082 { 083 send(data, length, host, DEFAULT_PORT); 084 } 085 086 087 /*** 088 * Same as 089 * <code>send(data, data.length, host. DiscardUDPClient.DEFAULT_PORT)</code>. 090 ***/ 091 public void send(byte[] data, InetAddress host) throws IOException 092 { 093 send(data, data.length, host, DEFAULT_PORT); 094 } 095 096 } 097