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Задаци

Задаци. N Body Gravitational Problem.

kadeem
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Задаци

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  1. Задаци

  2. N Body Gravitational Problem У свемиру постоји N небеских тела која међусобно интерагују. Користећи програмски језик Јава потребно је симулирати кретање ових тела користећи више рачунара у паралели. При томе треба узети да је један рачунар задужен за више небеских тела. Број небеских тела је много већи од броја расположивих рачунара.

  3. N Body Gravitational Problem

  4. N Body Gravitational Problem

  5. N Body Gravitational Problem

  6. N Body Gravitational Problem

  7. N Body Gravitational Problem

  8. N Body Gravitational Problem

  9. N Body Gravitational Problem

  10. N Body Gravitational Problem

  11. Клијент-сервер public interface Message { public void setData(Object data); public Object getData(); public void setMessageID(long messageID); public long getMessageID(); } public interface Buffer { public static final int MAXBUFFERSIZE = 150; public Object get(); public void put(Object data); public void remove(Object data); public int size(); public int capacity(); }

  12. Клијент-сервер public interface Protocol { public TextMessage conversation(TextMessage msg) throws NextMsgException; public boolean endConvresation(); public boolean startConvresation(); public void conversation(); public void addCommunicator(Communicator c); public boolean removeCommunicator(Communicator c); public Communicator getCommunicator(int id); }

  13. Клијент-сервер public interface Communicator { public boolean init(); public boolean close(); public TextMessage readMessage(); public void writeMessage(TextMessage m); public Object readObject(); public void writeObject(Object m); public String readString(); public void writeString(String s); public void flush(); }

  14. Клијент-сервер import java.util.*; publicclass ArrayBuffer implements Buffer{ privateint capacity; ArrayList arrayBuffer; public ArrayBuffer(){ capacity = MAXBUFFERSIZE; arrayBuffer = new ArrayList(); } public ArrayBuffer(int newCapacity){ if((newCapacity > 0) && (newCapacity <= MAXBUFFERSIZE )) capacity = newCapacity; else capacity = MAXBUFFERSIZE; arrayBuffer = new ArrayList(); }

  15. Клијент-сервер publicsynchronized Object get() { while (arrayBuffer.size() == 0) { try { wait(); } catch (InterruptedException ex ) {ex.printStackTrace();} } Object o = arrayBuffer.remove(0); notifyAll(); return o; } publicsynchronizedvoid put(Object value) { while (arrayBuffer.size() == capacity) { try { wait(); } catch (InterruptedException ex ) {ex.printStackTrace();} } arrayBuffer.add(value); notifyAll(); }

  16. Клијент-сервер publicsynchronizedvoid remove(Object data){ try{ int index = arrayBuffer.indexOf(data); if(index < 0) return; arrayBuffer.remove(index); }catch (Exception ex ) { System.out.println(ex); ex.printStackTrace();} } publicsynchronizedint size(){ return arrayBuffer.size(); } publicsynchronizedint capacity(){ return capacity; } }

  17. Клијент-сервер publicclass TextMessage implements Serializable, Message{ static long ID = 0; long messageID; String text; public TextMessage(String s, long sentID){ messageID = sentID; text = s; } public TextMessage(TextMessage m){ this(m.getText(), m.getMessageID()); } publicvoid setData(Object data) { if(data instanceofString){ text = (String)data; } } ...

  18. Клијент-сервер import java.net.*; import java.io.*; publicclass SocketCommunicator implements Communicator { Socket client; InputStream in; OutputStream out; ObjectOutputStream oout; ObjectInputStream oin; PrintWriter pout; BufferedReader pin; public SocketCommunicator(Socket client) { this.client = client; } public SocketCommunicator() { }

  19. Клијент-сервер publicboolean init() { boolean ok = true; try { out = client.getOutputStream(); oout = new ObjectOutputStream(out); pout = new PrintWriter(out, true); } catch (Exception e) {ok = false;} try { in = client.getInputStream(); oin = new ObjectInputStream(in); pin = new BufferedReader(new InputStreamReader(in)); } catch (Exception e) {ok = false;} return ok; }

  20. Клијент-сервер publicboolean close() { boolean ok = true; try { pin.close(); oin.close(); in.close(); } catch (IOException ex) { ok = false; } try { pout.close(); out.close(); oout.close(); client.close(); } catch (IOException ex) { ok = false;} return ok; }

  21. Клијент-сервер public TextMessage readMessage() { try { TextMessage m = (TextMessage) oin.readObject(); return m; } catch (Exception ex) { System.out.println(ex); ex.printStackTrace(); } returnnull; } publicvoid writeMessage(TextMessage m) { try { oout.writeObject(m); } catch (Exception ex) { System.out.println(ex); ex.printStackTrace(); } }

  22. Клијент-сервер public Object readObject() { try { Object m = (Object) oin.readObject(); return m; } catch (Exception ex) { System.out.println(ex); ex.printStackTrace(); } returnnull; } publicvoid writeObject(Object m) { try { oout.writeObject(m); } catch (Exception ex) { System.out.println(ex); ex.printStackTrace(); } }

  23. Клијент-сервер publicString readString() { try { String s = pin.readLine(); return s; } catch (Exception ex) { System.out.println(ex); ex.printStackTrace(); } returnnull; } publicvoid writeString(String s) { try { pout.println(s); } catch (Exception ex) { System.out.println(ex); ex.printStackTrace(); } }

  24. Клијент-сервер publicvoid flush() { } publicvoid setClient(Socket client) { this.client = client; init(); } }

  25. Клијент-сервер import java.net.*; publicclass Server implements Runnable{ publicstaticfinalint DEFAULTPORT = 88; staticint ID = 0; int port; private Thread thread = null; public Server(){ port = DEFAULTPORT; } public Server(int port){ this.port = port; } publicvoid start() { if (thread == null) { thread = new Thread(this, "Server"); thread.start(); } }

  26. Клијент-сервер publicvoid run() { try { ServerSocket listener = new ServerSocket( port ); Thread myThread = Thread.currentThread(); while (thread == myThread) { try { Socket client = listener.accept(); proceedRequest(client); }catch (Exception ex1 ) {ex1.printStackTrace();} } listener.close(); }catch (Exception ex ) {ex.printStackTrace();} }

  27. Клијент-сервер publicvoid proceedRequest(Socket client){ new TServer(client, ID++).start(); } publicvoid stop() { Thread stopThread = thread; thread = null; stopThread.interrupt(); } public int getPort() { return port; } publicvoid setPort(int port) { this.port = port; } }

  28. Клијент-сервер import java.net.*; publicclass TServer extends Thread { protected long ID; protected Protocol protocol; protected Communicator communicator; protected Socket client; public TServer() { this(null, 0, new ServerProtocol()); } public TServer(Socket client, long ID) { this(client, ID, new ServerProtocol()); } public TServer(Socket client, long ID, Protocol protocol) { super("Thread Server" + ID); this.ID = ID; this.client = client; this.communicator = new SocketCommunicator(client); this.protocol = protocol; }

  29. Клијент-сервер publicvoid run() { work(); } publicvoid work() { try { if (protocol == null) return; Communicator c = this.getCommunicator(); c.init(); protocol.addCommunicator(c); protocol.conversation(); c.close(); } catch (Exception ex) { System.out.println(ex); ex.printStackTrace(); } }

  30. Клијент-сервер public Socket getClient() { System.out.println("getClient " + this.getClass()); return client; } public Communicator getCommunicator() { returnnew SocketCommunicator(getClient()); } }

  31. Клијент-сервер import java.net.*; publicclass TClient extends TServer{ public TClient() { super(null, 0, new ClientProtocol()); } public TClient(Socket client, long ID) { super(client, ID, new ClientProtocol()); } public TClient(Socket client, long ID, Protocol protocol) { super(client, ID, protocol); } }

  32. Клијент-сервер public class OneCommunicatorProtocol implements Protocol{ Communicator c; public OneCommunicatorProtocol(){} public OneCommunicatorProtocol(Communicator c){ this.c = c; } public TextMessage conversation(TextMessage msg) throws NextMsgException{ return null;} public boolean endConvresation(){return true;} public boolean startConvresation(){ return false;} public void conversation(){} public void addCommunicator(Communicator c){ this.c = c; }

  33. Клијент-сервер public boolean removeCommunicator(Communicator c) { if(this.c.equals(c)){ c = null; return true; } return false; } public Communicator getCommunicator(int id){ return c; } }

  34. Клијент-сервер publicclass ClientProtocol extends OneCommunicatorProtocol{ public ClientProtocol(){} public ClientProtocol(Communicator c){ this.c = c; } publicvoid conversation(){ c.writeString("Hello!"); System.out.println("sent Hello!"); String response = c.readString(); System.out.println("received " + response); TextMessage m = new TextMessage("Mesage teks" + response); c.writeObject(m); } }

  35. Клијент-сервер publicclass ServerProtocol extends OneCommunicatorProtocol{ public ServerProtocol(){} public ServerProtocol(Communicator c){ this.c = c; } publicvoid conversation(){ String response = c.readString(); System.out.println("received " + response); c.writeString("Goodbye!"); System.out.println("sent Goodbye! "); TextMessage m = (TextMessage)c.readObject(); System.out.println(m); } }

  36. Клијент-сервер import java.net.*; public class ClientTest1{ static final int port = 88; static final String host = "127.0.0.1"; public static void main(String [] args) { for(int i = 0; i < 10; i ++){ try { Socket server = new Socket(host, port); TClient tc = new TClient( server, i, new ClientProtocol()); tc.start(); tc.join(); server.close(); Thread.sleep(5000+(int)(Math.random()*1000)); } catch(InterruptedException e) {e.printStackTrace();} } } }

  37. Клијент-сервер publicclass ServerTest1{ publicstaticvoid main(String [] args) { Server s = new BufferServer(new ServerProtocol()); s.start(); } }

  38. Клијент-сервер import java.net.*; publicclass OneThreadServer extends Server{ public OneThreadServer(){} publicvoid proceedRequest(Socket client){ try{ TServer tserver = new TServer(client, ID++); tserver.start(); tserver.join(); }catch (Exception ex ) { System.out.println(ex); ex.printStackTrace();} } }

  39. Клијент-сервер import java.net.*; publicclass BufferServer extends Server{ publicstaticfinalint numThreads = 10; Buffer buffer; public BufferServer(int num, Protocol protocol, int port){ super(port); buffer = new ArrayBuffer(); for(int i = 0; i < num; i++){ TServer t = new BufferTServer(buffer, protocol); t.setDaemon(true); t.start(); } } publicvoid proceedRequest(Socket client){ try{ buffer.put(client); }catch (Exception ex ) {ex.printStackTrace();} } }

  40. Клијент-сервер import java.net.*; publicclass BufferTServer extends TServer{ Buffer buffer; public BufferTServer(Buffer buffer, Protocol protocol){ this.buffer = buffer; this.protocol = protocol; } publicvoid run() { while(true){ work(); } } public Socket getClient(){ return (Socket)buffer.get(); } }

  41. N Body Gravitational Problem

  42. Питања? Захарије Радивојевић Електротехнички Факултет Универзитет у Београду zaki@etf.bg.ac.yu

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