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17 package org.apache.logging.log4j.core.net.server;
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19 import java.io.BufferedReader;
20 import java.io.ByteArrayInputStream;
21 import java.io.EOFException;
22 import java.io.IOException;
23 import java.io.InputStream;
24 import java.io.InputStreamReader;
25 import java.io.ObjectInputStream;
26 import java.io.OptionalDataException;
27 import java.net.DatagramPacket;
28 import java.net.DatagramSocket;
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30 import org.apache.logging.log4j.core.config.ConfigurationFactory;
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38 public class UdpSocketServer<T extends InputStream> extends AbstractSocketServer<T> {
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49 public static UdpSocketServer<InputStream> createJsonSocketServer(final int port) throws IOException {
50 return new UdpSocketServer<InputStream>(port, new JsonInputStreamLogEventBridge());
51 }
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62 public static UdpSocketServer<ObjectInputStream> createSerializedSocketServer(final int port) throws IOException {
63 return new UdpSocketServer<ObjectInputStream>(port, new ObjectInputStreamLogEventBridge());
64 }
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75 public static UdpSocketServer<InputStream> createXmlSocketServer(final int port) throws IOException {
76 return new UdpSocketServer<InputStream>(port, new XmlInputStreamLogEventBridge());
77 }
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87 public static void main(final String[] args) throws Exception {
88 if (args.length < 1 || args.length > 2) {
89 System.err.println("Incorrect number of arguments");
90 printUsage();
91 return;
92 }
93 final int port = Integer.parseInt(args[0]);
94 if (port <= 0 || port >= MAX_PORT) {
95 System.err.println("Invalid port number");
96 printUsage();
97 return;
98 }
99 if (args.length == 2 && args[1].length() > 0) {
100 ConfigurationFactory.setConfigurationFactory(new ServerConfigurationFactory(args[1]));
101 }
102 final UdpSocketServer<ObjectInputStream> socketServer = UdpSocketServer.createSerializedSocketServer(port);
103 final Thread server = new Thread(socketServer);
104 server.start();
105 final BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
106 while (true) {
107 final String line = reader.readLine();
108 if (line == null || line.equalsIgnoreCase("Quit") || line.equalsIgnoreCase("Stop")
109 || line.equalsIgnoreCase("Exit")) {
110 socketServer.shutdown();
111 server.join();
112 break;
113 }
114 }
115 }
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117 private static void printUsage() {
118 System.out.println("Usage: ServerSocket port configFilePath");
119 }
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121 private final DatagramSocket datagramSocket;
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124 private final int maxBufferSize = 1024 * 65 + 1024;
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135 public UdpSocketServer(final int port, final LogEventBridge<T> logEventInput) throws IOException {
136 super(port, logEventInput);
137 this.datagramSocket = new DatagramSocket(port);
138 }
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143 @Override
144 public void run() {
145 while (isActive()) {
146 if (datagramSocket.isClosed()) {
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148 return;
149 }
150 try {
151 final byte[] buf = new byte[maxBufferSize];
152 final DatagramPacket packet = new DatagramPacket(buf, buf.length);
153 datagramSocket.receive(packet);
154 final ByteArrayInputStream bais = new ByteArrayInputStream(packet.getData(), packet.getOffset(), packet.getLength());
155 logEventInput.logEvents(logEventInput.wrapStream(bais), this);
156 } catch (final OptionalDataException e) {
157 if (datagramSocket.isClosed()) {
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159 return;
160 }
161 logger.error("OptionalDataException eof=" + e.eof + " length=" + e.length, e);
162 } catch (final EOFException e) {
163 if (datagramSocket.isClosed()) {
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165 return;
166 }
167 logger.info("EOF encountered");
168 } catch (final IOException e) {
169 if (datagramSocket.isClosed()) {
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171 return;
172 }
173 logger.error("Exception encountered on accept. Ignoring. Stack Trace :", e);
174 }
175 }
176 }
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181 public void shutdown() {
182 this.setActive(false);
183 Thread.currentThread().interrupt();
184 datagramSocket.close();
185 }
186 }