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String registration = "rmi://" + registry + "/TemperatureSensor"; // Register with service so that clients can // find us Namingrebind( registration, sensor ); // Create a thread, and pass the sensor server // This will activate the run() method, and // trigger regular temperature changes Thread thread = new Thread (sensor); threadstart(); } catch (RemoteException re) { Systemerrprintln ("Remote Error - " + re); } catch (Exception e) { Systemerrprintln ("Error - " + e); } } }
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111124 Implementing the Listener Interface The temperature monitor client must implement the TemperatureListener interface, and register itself with the remote temperature sensor service, by invoking the TemperatureSensoraddTemperatureListener (Temperature Listener) method By registering as a listener, the monitor client will be notified of changes as they occur, using a remote callback The client waits patiently for any changes, and though it does not ever remove itself as a listener, functionality to achieve this is supplied by the
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TemperatureSensorremoveTemper atureListener(TemperatureListener)
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import javarmi*; import javarmiserver*; // 11, Listing 5 public class TemperatureMonitor extends UnicastRemoteObject implements TemperatureListener { // Default constructor throws a RemoteException public TemperatureMonitor() throws RemoteException { // no code req'd } public static void main(String args[]) { Systemoutprintln ("Looking for temperature sensor"); // Only required for dynamic class loading //SystemsetSecurityManager(new RMISecurityManager()); try { // Check to see if a registry was specified String registry = "localhost"; if (argslength >=1)
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{ registry = args[0]; } // Registration format //registry_hostname :port/service // Note the :port field is optional String registration = "rmi://" + registry + "/TemperatureSensor"; // Lookup the service in the registry, and obtain // a remote service Remote remoteService = Naminglookup ( registration ); // Cast to a TemperatureSensor interface TemperatureSensor sensor = (TemperatureSensor) remoteService; // Get and display current temperature double reading = sensorgetTemperature(); Systemoutprintln ("Original temp : " + reading); // Create a new monitor and register it as a // listener with remote sensor TemperatureMonitor monitor = new TemperatureMonitor(); sensoraddTemperatureListener(monitor); } catch (NotBoundException nbe) { Systemoutprintln ("No sensors available"); } catch (RemoteException re) { Systemoutprintln ("RMI Error - " + re); } catch (Exception e) { Systemoutprintln ("Error - " + e); } } public void temperatureChanged(double temperature) throws javarmiRemoteException { Systemoutprintln ("Temperature change event : " + temperature); } }
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111125 Running the Callback Example When developing an RMI callback system, both parties (listener and event source) will act as servers and as clients This means that both parties need to have a copy of the class definitions, or access to a Web server if dynamic class loading is needed NOTE
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To use dynamic class loading, class files must be copied to a Web server, which must be specified as a command-line parameter (see Section 11101), and a security manager must be installed by uncommenting the line
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//SystemsetSecurityManager ( new RMISecurityManager() );
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The following steps should be performed, in order, to run the example 1 Compile the applications and generate stub/skeleton files for both TemperatureSensorServer and TemperatureSensorMonitor 2 Run the rmiregistry application 3 Run the TemperatureSensorServer 4 Run the TemperatureSensorMonitor When first connected, the monitor will display the current temperature It registers itself with the server and is notified of changes by a callback Terminating the client will cause it to be unregistered in the TemperatureSensorServer, when the sensor is unable to notify the client In addition, the callback will be unregistered if the server is unable to notify the client due to a network error
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One of the chief disadvantages of using RMI for large and complex systems is the amount of overhead generated by RMI server software Suppose you are constructing a massive system, with many different RMI service interfaces and server implementations In such a system, each server would have to be running continually, even if it was seldom used by client software Servers must create and export remote objects that implement RMI service interfaces, which consumes memory and CPU time If each implementation is created as a separate server, this means that there will be as many JVM instances as there are services (unless all servers are combined into one, which is a messy solution and still wastes memory, as an instance of each service must still be created even if not used) So a system with a dozen separate RMI servers would need at least a dozen JVMs, and possibly one more if the rmiregistry application is being used Of course, this is only a moderately sized distributed system imagine large ones that run indefinitely but are infrequently used This translates into wasted CPU cycles and more memory than is needed (particularly if each service allocates memory for state information and loads many objects into memory) Prior to JDK12 and the Java 2 platform, there was no way to solve this problem (other than to distribute RMI services across the network and not on a single server) As this is a serious issue for medium-to-large-scale software development projects that employ RMI, Sun Microsystems took it seriously, and introduced a solution in the Java 2 platform release remote object activation Readers may find both the concept and the implementation of remote object activation to be quite complex Designing and implementing an activatable RMI service will not be appropriate in every circumstance for example, if you have only a few services and they are running almost constantly, the performance gains from an activatable version may be small in comparison with the headaches involved Nonetheless, for large-scale systems, this is an important technology to be aware of, and extremely useful
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