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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a>
<span class="sourceLineNo">003</span> * contributor license agreements. See the NOTICE file distributed with<a name="line.3"></a>
<span class="sourceLineNo">004</span> * this work for additional information regarding copyright ownership.<a name="line.4"></a>
<span class="sourceLineNo">005</span> * The ASF licenses this file to You under the Apache license, Version 2.0<a name="line.5"></a>
<span class="sourceLineNo">006</span> * (the "License"); you may not use this file except in compliance with<a name="line.6"></a>
<span class="sourceLineNo">007</span> * the License. You may obtain a copy of the License at<a name="line.7"></a>
<span class="sourceLineNo">008</span> *<a name="line.8"></a>
<span class="sourceLineNo">009</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a>
<span class="sourceLineNo">010</span> *<a name="line.10"></a>
<span class="sourceLineNo">011</span> * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a>
<span class="sourceLineNo">012</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a>
<span class="sourceLineNo">013</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a>
<span class="sourceLineNo">014</span> * See the license for the specific language governing permissions and<a name="line.14"></a>
<span class="sourceLineNo">015</span> * limitations under the license.<a name="line.15"></a>
<span class="sourceLineNo">016</span> */<a name="line.16"></a>
<span class="sourceLineNo">017</span>package org.apache.logging.log4j.core.net;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import java.io.IOException;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.io.OutputStream;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.net.DatagramPacket;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.net.DatagramSocket;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.net.InetAddress;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.net.SocketException;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.net.UnknownHostException;<a name="line.25"></a>
<span class="sourceLineNo">026</span><a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.apache.logging.log4j.Logger;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.apache.logging.log4j.core.appender.AppenderLoggingException;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import org.apache.logging.log4j.status.StatusLogger;<a name="line.29"></a>
<span class="sourceLineNo">030</span><a name="line.30"></a>
<span class="sourceLineNo">031</span>/**<a name="line.31"></a>
<span class="sourceLineNo">032</span> * OutputStream for UDP connections.<a name="line.32"></a>
<span class="sourceLineNo">033</span> */<a name="line.33"></a>
<span class="sourceLineNo">034</span>public class DatagramOutputStream extends OutputStream {<a name="line.34"></a>
<span class="sourceLineNo">035</span><a name="line.35"></a>
<span class="sourceLineNo">036</span> /**<a name="line.36"></a>
<span class="sourceLineNo">037</span> * Allow subclasses access to the status logger without creating another instance.<a name="line.37"></a>
<span class="sourceLineNo">038</span> */<a name="line.38"></a>
<span class="sourceLineNo">039</span> protected static final Logger LOGGER = StatusLogger.getLogger();<a name="line.39"></a>
<span class="sourceLineNo">040</span><a name="line.40"></a>
<span class="sourceLineNo">041</span> private static final int SHIFT_1 = 8;<a name="line.41"></a>
<span class="sourceLineNo">042</span> private static final int SHIFT_2 = 16;<a name="line.42"></a>
<span class="sourceLineNo">043</span> private static final int SHIFT_3 = 24;<a name="line.43"></a>
<span class="sourceLineNo">044</span><a name="line.44"></a>
<span class="sourceLineNo">045</span> private DatagramSocket datagramSocket;<a name="line.45"></a>
<span class="sourceLineNo">046</span> private final InetAddress inetAddress;<a name="line.46"></a>
<span class="sourceLineNo">047</span> private final int port;<a name="line.47"></a>
<span class="sourceLineNo">048</span><a name="line.48"></a>
<span class="sourceLineNo">049</span> private byte[] data;<a name="line.49"></a>
<span class="sourceLineNo">050</span><a name="line.50"></a>
<span class="sourceLineNo">051</span> private final byte[] header;<a name="line.51"></a>
<span class="sourceLineNo">052</span> private final byte[] footer;<a name="line.52"></a>
<span class="sourceLineNo">053</span><a name="line.53"></a>
<span class="sourceLineNo">054</span> /**<a name="line.54"></a>
<span class="sourceLineNo">055</span> * The Constructor.<a name="line.55"></a>
<span class="sourceLineNo">056</span> * @param host The host to connect to.<a name="line.56"></a>
<span class="sourceLineNo">057</span> * @param port The port on the host.<a name="line.57"></a>
<span class="sourceLineNo">058</span> */<a name="line.58"></a>
<span class="sourceLineNo">059</span> public DatagramOutputStream(final String host, final int port, final byte[] header, final byte[] footer) {<a name="line.59"></a>
<span class="sourceLineNo">060</span> this.port = port;<a name="line.60"></a>
<span class="sourceLineNo">061</span> this.header = header;<a name="line.61"></a>
<span class="sourceLineNo">062</span> this.footer = footer;<a name="line.62"></a>
<span class="sourceLineNo">063</span> try {<a name="line.63"></a>
<span class="sourceLineNo">064</span> inetAddress = InetAddress.getByName(host);<a name="line.64"></a>
<span class="sourceLineNo">065</span> } catch (final UnknownHostException ex) {<a name="line.65"></a>
<span class="sourceLineNo">066</span> final String msg = "Could not find host " + host;<a name="line.66"></a>
<span class="sourceLineNo">067</span> LOGGER.error(msg, ex);<a name="line.67"></a>
<span class="sourceLineNo">068</span> throw new AppenderLoggingException(msg, ex);<a name="line.68"></a>
<span class="sourceLineNo">069</span> }<a name="line.69"></a>
<span class="sourceLineNo">070</span><a name="line.70"></a>
<span class="sourceLineNo">071</span> try {<a name="line.71"></a>
<span class="sourceLineNo">072</span> datagramSocket = new DatagramSocket();<a name="line.72"></a>
<span class="sourceLineNo">073</span> } catch (final SocketException ex) {<a name="line.73"></a>
<span class="sourceLineNo">074</span> final String msg = "Could not instantiate DatagramSocket to " + host;<a name="line.74"></a>
<span class="sourceLineNo">075</span> LOGGER.error(msg, ex);<a name="line.75"></a>
<span class="sourceLineNo">076</span> throw new AppenderLoggingException(msg, ex);<a name="line.76"></a>
<span class="sourceLineNo">077</span> }<a name="line.77"></a>
<span class="sourceLineNo">078</span> }<a name="line.78"></a>
<span class="sourceLineNo">079</span><a name="line.79"></a>
<span class="sourceLineNo">080</span> @Override<a name="line.80"></a>
<span class="sourceLineNo">081</span> public synchronized void write(final byte[] bytes, final int offset, final int length) throws IOException {<a name="line.81"></a>
<span class="sourceLineNo">082</span> copy(bytes, offset, length);<a name="line.82"></a>
<span class="sourceLineNo">083</span> }<a name="line.83"></a>
<span class="sourceLineNo">084</span><a name="line.84"></a>
<span class="sourceLineNo">085</span> @Override<a name="line.85"></a>
<span class="sourceLineNo">086</span> public synchronized void write(final int i) throws IOException {<a name="line.86"></a>
<span class="sourceLineNo">087</span> copy(new byte[] {(byte) (i &gt;&gt;&gt; SHIFT_3), (byte) (i &gt;&gt;&gt; SHIFT_2), (byte) (i &gt;&gt;&gt; SHIFT_1), (byte) i}, 0, 4);<a name="line.87"></a>
<span class="sourceLineNo">088</span> }<a name="line.88"></a>
<span class="sourceLineNo">089</span><a name="line.89"></a>
<span class="sourceLineNo">090</span> @Override<a name="line.90"></a>
<span class="sourceLineNo">091</span> public synchronized void write(final byte[] bytes) throws IOException {<a name="line.91"></a>
<span class="sourceLineNo">092</span> copy(bytes, 0, bytes.length);<a name="line.92"></a>
<span class="sourceLineNo">093</span> }<a name="line.93"></a>
<span class="sourceLineNo">094</span><a name="line.94"></a>
<span class="sourceLineNo">095</span> @Override<a name="line.95"></a>
<span class="sourceLineNo">096</span> public synchronized void flush() throws IOException {<a name="line.96"></a>
<span class="sourceLineNo">097</span> try {<a name="line.97"></a>
<span class="sourceLineNo">098</span> if (this.data != null &amp;&amp; this.datagramSocket != null &amp;&amp; this.inetAddress != null) {<a name="line.98"></a>
<span class="sourceLineNo">099</span> if (footer != null) {<a name="line.99"></a>
<span class="sourceLineNo">100</span> copy(footer, 0, footer.length);<a name="line.100"></a>
<span class="sourceLineNo">101</span> }<a name="line.101"></a>
<span class="sourceLineNo">102</span> final DatagramPacket packet = new DatagramPacket(data, data.length, inetAddress, port);<a name="line.102"></a>
<span class="sourceLineNo">103</span> datagramSocket.send(packet);<a name="line.103"></a>
<span class="sourceLineNo">104</span> }<a name="line.104"></a>
<span class="sourceLineNo">105</span> } finally {<a name="line.105"></a>
<span class="sourceLineNo">106</span> data = null;<a name="line.106"></a>
<span class="sourceLineNo">107</span> if (header != null) {<a name="line.107"></a>
<span class="sourceLineNo">108</span> copy(header, 0, header.length);<a name="line.108"></a>
<span class="sourceLineNo">109</span> }<a name="line.109"></a>
<span class="sourceLineNo">110</span> }<a name="line.110"></a>
<span class="sourceLineNo">111</span> }<a name="line.111"></a>
<span class="sourceLineNo">112</span><a name="line.112"></a>
<span class="sourceLineNo">113</span> @Override<a name="line.113"></a>
<span class="sourceLineNo">114</span> public synchronized void close() throws IOException {<a name="line.114"></a>
<span class="sourceLineNo">115</span> if (datagramSocket != null) {<a name="line.115"></a>
<span class="sourceLineNo">116</span> if (data != null) {<a name="line.116"></a>
<span class="sourceLineNo">117</span> flush();<a name="line.117"></a>
<span class="sourceLineNo">118</span> }<a name="line.118"></a>
<span class="sourceLineNo">119</span> datagramSocket.close();<a name="line.119"></a>
<span class="sourceLineNo">120</span> datagramSocket = null;<a name="line.120"></a>
<span class="sourceLineNo">121</span> }<a name="line.121"></a>
<span class="sourceLineNo">122</span> }<a name="line.122"></a>
<span class="sourceLineNo">123</span><a name="line.123"></a>
<span class="sourceLineNo">124</span> private void copy(final byte[] bytes, final int offset, final int length) {<a name="line.124"></a>
<span class="sourceLineNo">125</span> final int index = data == null ? 0 : data.length;<a name="line.125"></a>
<span class="sourceLineNo">126</span> final byte[] copy = new byte[length + index];<a name="line.126"></a>
<span class="sourceLineNo">127</span> if (data != null) {<a name="line.127"></a>
<span class="sourceLineNo">128</span> System.arraycopy(data, 0, copy, 0, data.length);<a name="line.128"></a>
<span class="sourceLineNo">129</span> }<a name="line.129"></a>
<span class="sourceLineNo">130</span> System.arraycopy(bytes, offset, copy, index, length);<a name="line.130"></a>
<span class="sourceLineNo">131</span> data = copy;<a name="line.131"></a>
<span class="sourceLineNo">132</span> }<a name="line.132"></a>
<span class="sourceLineNo">133</span>}<a name="line.133"></a>
</pre>
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