1 interface TemperatureSensor extends java.rmi.remote 2 { 3 public double gettemperature() throws java.rmi.remoteexception; 4 public void
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1 1 interface TemperatureSensor extends java.rmi.remote 2 { 3 public double gettemperature() throws java.rmi.remoteexception; 4 public void addtemperaturelistener ( TemperatureListener listener ) 5 throws java.rmi.remoteexception; 6 public void removetemperaturelistener ( TemperatureListener listener ) 7 throws java.rmi.remoteexception; 8 } interface TemperatureListener extends java.rmi.remote 11 { 12 public void temperaturechanged(double temperature) 13 throws java.rmi.remoteexception; 14 } import java.util.*; 17 import java.rmi.*; 18 import java.rmi.server.*; public class TemperatureSensorServer extends UnicastRemoteObject 21 implements TemperatureSensor, Runnable 22 { 23 private volatile double temp; 24 private Vector list = new Vector(); public TemperatureSensorServer() throws java.rmi.remoteexception 27 { 28 // Assign a default setting for the temperature 29 temp = 98.0; 30 } public double gettemperature() throws java.rmi.remoteexception 33 { 34 return temp; 35 } public void addtemperaturelistener ( TemperatureListener listener ) 38 throws java.rmi.remoteexception 39 { 40 System.out.println ("adding listener -" + listener); 41 list.add (listener); 42 } public void removetemperaturelistener ( TemperatureListener listener ) 45 throws java.rmi.remoteexception 46 { 47 System.out.println ("removing listener -" + listener); 48 list.remove (listener); 49 } public void run() 52 {
2 53 Random r = new Random(); for (;;) 56 { 57 try 58 { 59 // Sleep for a random amount of time 60 int duration = r.nextint() % ; // Check to see if negative, if so, reverse 63 if (duration < 0) duration = duration * -1; Thread.sleep(duration); 66 } 67 catch (InterruptedException ie) { } // Get a number, to see if temp goes up or down 70 int num = r.nextint(); if (num < 0) 73 { 74 temp += 0.5; 75 } 76 else 77 { 78 temp -= 0.5; 79 } // Notify registered listeners 82 notifylisteners(); 83 } 84 } private void notifylisteners() 87 { 88 // Notify every listener in the registered list 89 for (Enumeration e = list.elements(); e.hasmoreelements(); ) 90 { 91 TemperatureListener listener = (TemperatureListener) e.nextelement(); // Notify, if possible a listener 94 try 95 { 96 listener.temperaturechanged (temp); 97 } 98 catch (RemoteException re) 99 { 100 System.out.println ("removing listener -" + listener); 101 // Remote the listener 102 list.remove( listener ); 103 } 104 }
3 105 } public static void main(string args[]) 108 { 109 System.out.println ("Loading temperature service"); // Only required for dynamic class loading 112 //System.setSecurityManager ( new RMISecurityManager() ); try 115 { 116 // Load the service 117 TemperatureSensorServer sensor = new TemperatureSensorServer(); // Check to see if a registry was specified 120 String registry = "localhost"; 121 if (args.length >=1) 122 { 123 registry = args[0]; 124 } // Registration format //registry_hostname (optional):port /service 127 String registration = "rmi://" + registry + "/TemperatureSensor"; // Register with service so that clients can find us 130 Naming.rebind( registration, sensor ); // Create a thread, and pass the sensor server. 133 // This will activate the run() method, and trigger 134 // regular temperature changes. 135 Thread thread = new Thread (sensor); 136 thread.start(); } 139 catch (RemoteException re) 140 { 141 System.err.println ("Remote Error - " + re); 142 } 143 catch (Exception e) 144 { 145 System.err.println ("Error - " + e); 146 } 147 } 148 } import java.rmi.*; 152 import java.rmi.server.*; public class TemperatureMonitor extends UnicastRemoteObject implements TemperatureListener 155 {
4 156 // Default constructor throws a RemoteException 157 public TemperatureMonitor() throws RemoteException 158 { 159 // no code req'd 160 } public static void main(string args[]) 163 { 164 System.out.println ("Looking for temperature sensor"); // Only required for dynamic class loading 167 //System.setSecurityManager ( new RMISecurityManager() ); try 170 { 171 // Check to see if a registry was specified 172 String registry = "localhost"; 173 if (args.length >=1) 174 { 175 registry = args[0]; 176 } // Registration format //registry_hostname (optional):port /service 179 String registration = "rmi://" + registry + "/TemperatureSensor"; // Lookup the service in the registry, and obtain a remote service 182 Remote remoteservice = Naming.lookup ( registration ); // Cast to a TemperatureSensor interface 185 TemperatureSensor sensor = (TemperatureSensor) remoteservice; // Get and display current temperature 188 double reading = sensor.gettemperature(); 189 System.out.println ("Original temp : " + reading); // Create a new monitor and register it as a listener with remote sensor 192 TemperatureMonitor monitor = new TemperatureMonitor(); 193 sensor.addtemperaturelistener(monitor); 194 } 195 catch (NotBoundException nbe) 196 { 197 System.out.println ("No sensors available"); 198 } 199 catch (RemoteException re) 200 { 201 System.out.println ("RMI Error - " + re); 202 } 203 catch (Exception e) 204 { 205 System.out.println ("Error - " + e); 206 } 207 }
5 public void temperaturechanged(double temperature) 210 throws java.rmi.remoteexception 211 { 212 System.out.println ("Temperature change event : " + temperature); 213 } 214 }
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