Sebastian Rieger
7 years ago
4 changed files with 249 additions and 178 deletions
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71VerteilteSysteme-Examples/src/verteiltesysteme/rmi/RMIEchoServer.java
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148VerteilteSysteme-Examples/src/verteiltesysteme/socket/timecounter/UDPTimeCounterClient.java
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122VerteilteSysteme-Examples/src/verteiltesysteme/socket/timecounter/UDPTimeCounterClientPing.java
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86VerteilteSysteme-Examples/src/verteiltesysteme/socket/timecounter/UDPTimeCounterServer.java
@ -1,36 +1,37 @@ |
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package verteiltesysteme.rmi; |
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import java.rmi.*; |
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import java.rmi.server.*; |
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import java.rmi.registry.*; |
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public class RMIEchoServer implements RMIEchoInterface { |
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public RMIEchoServer() {} |
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public static void main(String args[]) { |
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try { |
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RMIEchoServer obj = new RMIEchoServer(); |
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RMIEchoInterface stub = (RMIEchoInterface) UnicastRemoteObject.exportObject(obj, 0); |
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// Bind the remote object's stub in the registry |
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Registry registry = LocateRegistry.getRegistry(); |
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registry.bind("RMIEchoInterface", stub); |
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System.err.println("Server ready"); |
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} catch (Exception e) { |
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System.err.println("Server exception: " + e.toString()); |
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e.printStackTrace(); |
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} |
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} |
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@Override |
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public String toLowerCase(String input) throws RemoteException { |
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return input.toLowerCase(); |
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} |
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@Override |
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public String toUpperCase(String input) throws RemoteException { |
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return input.toUpperCase(); |
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} |
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package verteiltesysteme.rmi; |
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import java.rmi.RemoteException; |
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import java.rmi.registry.LocateRegistry; |
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import java.rmi.registry.Registry; |
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import java.rmi.server.UnicastRemoteObject; |
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public class RMIEchoServer implements RMIEchoInterface { |
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public RMIEchoServer() {} |
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public static void main(String args[]) { |
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try { |
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RMIEchoServer obj = new RMIEchoServer(); |
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RMIEchoInterface stub = (RMIEchoInterface) UnicastRemoteObject.exportObject(obj, 0); |
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// Bind the remote object's stub in the registry |
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Registry registry = LocateRegistry.getRegistry(); |
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registry.bind("RMIEchoInterface", stub); |
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System.err.println("Server ready"); |
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} catch (Exception e) { |
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System.err.println("Server exception: " + e.toString()); |
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e.printStackTrace(); |
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} |
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} |
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@Override |
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public String toLowerCase(String input) throws RemoteException { |
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return input.toLowerCase(); |
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} |
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@Override |
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public String toUpperCase(String input) throws RemoteException { |
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return input.toUpperCase(); |
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} |
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} |
} |
@ -1,55 +1,93 @@ |
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package verteiltesysteme.socket.timecounter; |
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import java.io.BufferedReader; |
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import java.io.InputStreamReader; |
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import java.net.DatagramPacket; |
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import java.net.DatagramSocket; |
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import java.net.InetAddress; |
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import java.text.DateFormat; |
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import java.text.SimpleDateFormat; |
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import java.util.Date; |
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class UDPTimeCounterClient { |
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public static void main(String args[]) throws Exception { |
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String hostname = ""; |
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int udpPort = 36038; |
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BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in)); |
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DatagramSocket clientSocket = new DatagramSocket(); |
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byte[] sendData = new byte[1024]; |
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byte[] receiveData = new byte[1024]; |
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DateFormat df = new SimpleDateFormat("dd.MM.yyyy HH:mm:ss"); |
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System.out.println("Bitte geben Sie die Server-Adresse ein: "); |
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hostname = inFromUser.readLine(); |
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InetAddress IPAddress = InetAddress.getByName(hostname); |
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System.out.println("Bitte geben Sie eine Zahl ein: "); |
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Long number = new Long(inFromUser.readLine()); |
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sendData = number.toString().getBytes(); |
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System.out.println(System.lineSeparator()); |
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long timestampStart = System.currentTimeMillis(); |
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System.out.println("Zeit vor Versand = " + timestampStart + " ms, " + df.format(new Date(timestampStart))); |
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DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, udpPort); |
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clientSocket.send(sendPacket); |
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long timestampSent = System.currentTimeMillis(); |
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System.out.println("Zeit nach Versand = " + timestampSent + " ms, " + df.format(new Date(timestampSent))); |
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DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length); |
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clientSocket.receive(receivePacket); |
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long timestampEnd = System.currentTimeMillis(); |
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System.out.println("Zeit nach Empfang = " + timestampEnd + " ms, " + df.format(new Date(timestampEnd))); |
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long delay = timestampEnd - timestampStart; |
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System.out.println("Delay = " + delay + " ms"); |
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System.out.println(System.lineSeparator()); |
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String result = new String(receivePacket.getData()); |
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System.out.println("Ausgabe vom Server:" + System.lineSeparator() + result); |
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long timestampServer = new Long(result.split(" ")[2]).longValue(); |
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float oneWayDelayEstimate = (timestampEnd - timestampSent) / 2; |
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float timestampSkew = timestampServer - timestampSent - oneWayDelayEstimate; |
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System.out.println("Zeitversatz zwischen Server und Client ca. = " + timestampSkew + " ms"); |
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System.out.println(System.lineSeparator()); |
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clientSocket.close(); |
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} |
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} |
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package verteiltesysteme.socket.timecounter; |
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import java.io.BufferedReader; |
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import java.io.InputStreamReader; |
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import java.net.DatagramPacket; |
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import java.net.DatagramSocket; |
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import java.net.InetAddress; |
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import java.text.DateFormat; |
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import java.text.SimpleDateFormat; |
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import java.util.Date; |
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class UDPTimeCounterClient { |
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/** |
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* Gibt einen Zeitstempel (timestamp) formatiert auf der Konsole aus. Der |
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* Zeitstempel wird in aktuellen Millisekunden seit 1.1.1970 (UTC) und als |
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* formatiertes Datum inkl. Uhrzeit ausgegeben. Der Ausgabe wird der übergebene |
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* String outputPrefix vorangestellt. |
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* |
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* @param outputPrefix |
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* String der als Beschreibung des Zeitpunkts vor die Ausgabe des |
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* timestamp gestellt wird. |
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* @param timestamp |
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* Zeitstempel basierend auf System.currentTimeMillis() |
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*/ |
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private static void printFormattedTimestamp(String outputPrefix, long timestamp) { |
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DateFormat df = new SimpleDateFormat("dd.MM.yyyy HH:mm:ss"); |
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System.out.println(outputPrefix + " = " + timestamp + " ms, " + df.format(new Date(timestamp))); |
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} |
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public static void main(String args[]) throws Exception { |
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String hostname = ""; |
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int udpPort = 36038; |
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BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in)); |
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byte[] sendData = new byte[1024]; |
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byte[] receiveData = new byte[1024]; |
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long timestampStart, timestampSent, timestampEnd, delay; |
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// Socket erzeugen |
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DatagramSocket clientSocket = new DatagramSocket(); |
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// Hostname vom Benutzer anfragen auf dem der Server läuft |
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System.out.println("Bitte geben Sie die Server-Adresse ein: "); |
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hostname = inFromUser.readLine(); |
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InetAddress IPAddress = InetAddress.getByName(hostname); |
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// Zahl vom Benutzer abfragen, die dann vom Server auf den aktuellen Zählerstand |
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// addiert wird |
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System.out.println("Bitte geben Sie eine Zahl ein: "); |
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Long number = new Long(inFromUser.readLine()); |
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sendData = number.toString().getBytes(); |
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// Zahl an Server senden |
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System.out.println(System.lineSeparator()); |
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timestampStart = System.currentTimeMillis(); |
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printFormattedTimestamp("Zeit vor Versand", timestampStart); |
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DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, udpPort); |
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clientSocket.send(sendPacket); |
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timestampSent = System.currentTimeMillis(); |
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printFormattedTimestamp("Zeit nach Versand", timestampSent); |
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// Antwort mit neuem Zählerstand und Timestamp vom Server empfangen |
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DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length); |
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clientSocket.receive(receivePacket); |
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timestampEnd = System.currentTimeMillis(); |
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printFormattedTimestamp("Zeit nach Empfang", timestampEnd); |
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// Delay als Zeit zwischen timestampSent und timestampEnd berechnen und |
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// ausgeben |
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delay = timestampEnd - timestampStart; |
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System.out.println("Delay = " + delay + " ms"); |
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System.out.println(System.lineSeparator()); |
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// Antwort vom Server auswerten und ausgeben |
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String result = new String(receivePacket.getData()); |
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System.out.println("Ausgabe vom Server:" + System.lineSeparator() + result); |
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// Vom Server übergebenen Zeitstempel aus der Antwort herausschneiden |
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// |
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// Format Ausgabe vom Server "<Zählerstand> Zeit: <Zeitstempel> <Datum/Uhrzeit>" |
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// Beispiel: 60 Zeit: 1510735274021 15.11.2017 08:41:14 |
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long timestampServer = new Long(result.split(" ")[2]).longValue(); |
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// One-Way-Delay (Bitverzögerung) aus Rount-Trip-Time (RTT) ermitteln |
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float oneWayDelayEstimate = (timestampEnd - timestampSent) / 2; |
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// Zeitabweichung zwischen Client und Server ermitteln (Zeitstempel vom Server |
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// minus Zeitstempel bei Versand am Client minus One-Way-Delay) |
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float timestampSkew = timestampServer - timestampSent - oneWayDelayEstimate; |
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System.out.println("Zeitversatz zwischen Server und Client ca. = " + timestampSkew + " ms"); |
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System.out.println(System.lineSeparator()); |
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// Socket schließen |
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clientSocket.close(); |
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} |
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} |
@ -1,52 +1,70 @@ |
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package verteiltesysteme.socket.timecounter; |
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import java.io.BufferedReader; |
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import java.io.InputStreamReader; |
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import java.net.DatagramPacket; |
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import java.net.DatagramSocket; |
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import java.net.InetAddress; |
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class UDPTimeCounterClientPing { |
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public static void main(String args[]) throws Exception { |
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String hostname = ""; |
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int udpPort = 36038; |
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BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in)); |
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DatagramSocket clientSocket = new DatagramSocket(); |
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byte[] sendData = new byte[1024]; |
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byte[] receiveData = new byte[1024]; |
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System.out.println("Bitte geben Sie die Server-Adresse ein: "); |
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hostname = inFromUser.readLine(); |
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InetAddress IPAddress = InetAddress.getByName(hostname); |
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System.out.println("Bitte geben Sie die Anzahl gewünschter Pings ein: "); |
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Long pingCount = new Long(inFromUser.readLine()); |
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Long number = new Long(1); |
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sendData = number.toString().getBytes(); |
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DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length); |
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long average = 0; |
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for (long i = 0; i < pingCount; i++) |
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{ |
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long timestampStart = System.currentTimeMillis(); |
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DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, udpPort); |
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clientSocket.send(sendPacket); |
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receivePacket = new DatagramPacket(receiveData, receiveData.length); |
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clientSocket.receive(receivePacket); |
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long timestampEnd = System.currentTimeMillis(); |
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long delay = timestampEnd - timestampStart; |
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average += delay; |
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System.out.println("Delay = " + delay + " ms"); |
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Thread.sleep(1000); |
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} |
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System.out.println("Durchschnitt: " + (average / (float)pingCount) + " ms"); |
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System.out.println(System.lineSeparator()); |
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String result = new String(receivePacket.getData()); |
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System.out.println("Ausgabe vom Server:" + System.lineSeparator() + result); |
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System.out.println(System.lineSeparator()); |
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clientSocket.close(); |
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} |
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} |
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package verteiltesysteme.socket.timecounter; |
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import java.io.BufferedReader; |
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import java.io.InputStreamReader; |
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import java.net.DatagramPacket; |
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import java.net.DatagramSocket; |
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import java.net.InetAddress; |
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class UDPTimeCounterClientPing { |
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public static void main(String args[]) throws Exception { |
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String hostname = ""; |
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int udpPort = 36038; |
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BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in)); |
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byte[] sendData = new byte[1024]; |
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byte[] receiveData = new byte[1024]; |
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// Socket erzeugen |
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DatagramSocket clientSocket = new DatagramSocket(); |
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// Hostname vom Benutzer anfragen auf dem der Server läuft |
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System.out.println("Bitte geben Sie die Server-Adresse ein: "); |
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hostname = inFromUser.readLine(); |
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InetAddress IPAddress = InetAddress.getByName(hostname); |
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// Gewünschte Anzahl von Pings vom Benutzer abfragen |
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System.out.println("Bitte geben Sie die Anzahl gewünschter Pings ein: "); |
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Long pingCount = new Long(inFromUser.readLine()); |
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// bei jedem Ping wird Zählerstand auf dem Server um 1 erhöht |
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Long number = new Long(1); |
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sendData = number.toString().getBytes(); |
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// Paket für Empfang erzeugen |
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DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length); |
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long average = 0; // Variable zur Ermittlung des durchschnittlichen Delays |
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// Pings ausführen |
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for (long i = 0; i < pingCount; i++) { |
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// Anfrage an Server senden |
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long timestampStart = System.currentTimeMillis(); |
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DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, udpPort); |
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clientSocket.send(sendPacket); |
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// Antwort von Server empfangen |
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receivePacket = new DatagramPacket(receiveData, receiveData.length); |
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clientSocket.receive(receivePacket); |
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// Delay aus Zeit zwischen Zeitstempeln vor Versand und nach Empfang berechnen |
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long timestampEnd = System.currentTimeMillis(); |
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long delay = timestampEnd - timestampStart; |
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// Delay auf Variable für Ermittlung des durchschnittlichen Delays addieren |
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average += delay; |
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System.out.println("Delay = " + delay + " ms"); |
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// 1 Sekunde warten |
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Thread.sleep(1000); |
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} |
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// Durchscnitt berechnen und ausgeben |
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System.out.println("Durchschnitt: " + (average / (float) pingCount) + " ms"); |
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System.out.println(System.lineSeparator()); |
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// Antwort vom Server ausgeben |
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String result = new String(receivePacket.getData()); |
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System.out.println("Letzte Ausgabe vom Server:" + System.lineSeparator() + result); |
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System.out.println(System.lineSeparator()); |
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// Socket schließen |
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clientSocket.close(); |
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} |
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} |
@ -1,36 +1,50 @@ |
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package verteiltesysteme.socket.timecounter; |
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import java.net.DatagramPacket; |
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import java.net.DatagramSocket; |
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import java.net.InetAddress; |
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import java.text.DateFormat; |
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import java.text.SimpleDateFormat; |
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import java.util.Date; |
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class UDPTimeCounterServer { |
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private static long counter = 0; |
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public static void main(String args[]) throws Exception { |
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int udpPort = 36038; |
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@SuppressWarnings("resource") |
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DatagramSocket serverSocket = new DatagramSocket(udpPort); |
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byte[] receiveData = new byte[1024]; |
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byte[] sendData = new byte[1024]; |
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DateFormat df = new SimpleDateFormat("dd.MM.yyyy HH:mm:ss"); |
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while (true) { |
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DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length); |
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serverSocket.receive(receivePacket); |
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long number = new Long(new String(receivePacket.getData(), 0, receivePacket.getLength())); |
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InetAddress IPAddress = receivePacket.getAddress(); |
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int clientSrcPort = receivePacket.getPort(); |
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counter += number; |
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sendData = (Long.toString(counter) + " Zeit: " + System.currentTimeMillis() + " " + df.format(new Date(System.currentTimeMillis()))).getBytes(); |
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DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, clientSrcPort); |
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serverSocket.send(sendPacket); |
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} |
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} |
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} |
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package verteiltesysteme.socket.timecounter; |
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import java.net.DatagramPacket; |
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import java.net.DatagramSocket; |
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import java.net.InetAddress; |
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import java.text.DateFormat; |
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import java.text.SimpleDateFormat; |
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import java.util.Date; |
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class UDPTimeCounterServer { |
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// Variable für Zählerstand des Servers, dieser Zähler wird durch Anfragen der |
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// Clients erhöht |
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private static long counter = 0; |
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public static void main(String args[]) throws Exception { |
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int udpPort = 36038; |
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byte[] receiveData = new byte[1024]; |
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byte[] sendData = new byte[1024]; |
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DateFormat df = new SimpleDateFormat("dd.MM.yyyy HH:mm:ss"); |
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// Socket erzeugen |
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// Warnung, dass Socket nicht geschlossen wird unterdrücken ;) |
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@SuppressWarnings("resource") |
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DatagramSocket serverSocket = new DatagramSocket(udpPort); |
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System.out.println("Server ready... waiting for packets..."); |
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while (true) { |
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// Anfrage vom Client empfangen |
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DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length); |
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serverSocket.receive(receivePacket); |
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|
|
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// Vom Client gesendete Zahl einlesen und auf aktuellen Zählerstand addieren |
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|
long number = new Long(new String(receivePacket.getData(), 0, receivePacket.getLength())); |
||||
|
counter += number; |
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|
|
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|
// Absender IP-Adresse und Port für Rückversand (Antwort) ermitteln |
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|
InetAddress IPAddress = receivePacket.getAddress(); |
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|
int clientSrcPort = receivePacket.getPort(); |
||||
|
//System.out.println("Anfrage von Client " + IPAddress + ":" + clientSrcPort + " Zahl: " + number + " Zählerstand: " + counter); |
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|
|
||||
|
// Antwort vom Server senden |
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|
String output = (Long.toString(counter) + " Zeit: " + System.currentTimeMillis() + " " |
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|
+ df.format(new Date(System.currentTimeMillis()))); |
||||
|
//System.out.println("Antwort des Servers: " + output); |
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|
sendData = output.getBytes(); |
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|
DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, clientSrcPort); |
||||
|
serverSocket.send(sendPacket); |
||||
|
} |
||||
|
} |
||||
|
} |
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