Question1 (10 points) : Patron Aggregator

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Russell McCarthy
6 years ago
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1 NSY102 Une idée de solution Conception de logiciels Intranet : Patrons et Canevas. Session de Juillet 2010-durée : 2 heures Tous documents papiers autorisés Cnam / Paris-HTO & FOD Sommaire : Question 1 (10 points): Patron Aggregator Question 2 (7 points) : Patron Aggregator / RMI Question 3 (3 points) : Patron Aggregator / JMX Question1 (10 points) : Patron Aggregator package question1; import java.util.arraylist; import java.util.concurrent.blockingqueue; import java.util.concurrent.arrayblockingqueue; import java.util.concurrent.timeunit; /** * Un collecteur de messages. * inspiré de public class Aggregator<M> implements AggregatorI<M>{ /** La file des messages collectés. private ArrayBlockingQueue<M> queue; /** le nombre de messages à collecter. private int number; public Aggregator(){ setcapacity(default_capacity); public Aggregator(int number) { setcapacity(number); public synchronized void setcapacity(int number){ if(this.queue!= null) queue.clear(); this.queue = new ArrayBlockingQueue<M>(number); this.number = number; public int getcapacity(){ return this.number; public int size(){

2 return queue.size(); public boolean send(m message) throws NullPointerException, return queue.offer(message); public synchronized List<M> receive() throws List<M> liste = new ArrayList<M>(); for(int i=0;i<this.number;i++){ M msg = queue.take(); liste.add(msg); // drainto? finally{ this.queue.clear(); return liste; public synchronized List<M> receive(long timeout) throws List<M> liste = new ArrayList<M>(); long délai = timeout; long top = System.currentTimeMillis(); int i=0; boolean actif = true; while(i<this.number && actif){ délai = délai -(System.currentTimeMillis()-top); top = System.currentTimeMillis(); if(délai>=0){ M msg = queue.poll(délai,timeunit.milliseconds); if(msg==null) actif = false; // délai échu, par l'appel de poll else liste.add(msg); else{ actif=false; // délai échu, par le cumul des attentes i++; finally{ this.queue.clear(); return liste; Question2 (7 points) : Patron Aggregator en intranet / RMI import question1.aggregatori; import java.rmi.remote; import java.rmi.remoteexception; import java.rmi.server.unicastremoteobject;

3 public class AggregatorRMI<M extends Serializable> extends UnicastRemoteObject implements AggregatorRMII<M>{ private AggregatorI<M> aggregator; public AggregatorRMI(AggregatorI<M> aggregator)throws RemoteException{ this.aggregator = aggregator; public boolean send(m message) throws RemoteException, return aggregator.send(message); public List<M> receive() throws RemoteException, return aggregator.receive(); public List<M> receive(long timeout) throws RemoteException, return aggregator.receive(timeout); public void setcapacity(int number) throws RemoteException{ aggregator.setcapacity(number); public int getcapacity() throws RemoteException{ return aggregator.getcapacity(); public int size() throws RemoteException{ return aggregator.size(); import java.rmi.*; import java.rmi.registry.*; /** * start java -cp. -Djava.rmi.server.codebase= - Djava.security.policy=java.policy question2.aggregatorreceive public class AggregatorReceive{ public static void main(string[] args) throws Exception { System.setSecurityManager(new RMISecurityManager()); AggregatorRMII<String> aggregator = (AggregatorRMII<String>)Naming.lookup("aggregator"); List<String> liste = aggregator.receive(); System.out.println("liste recue : " + liste); finally{ //System.exit(0);

4 import java.rmi.*; import java.rmi.registry.*; public class AggregatorSend{ /* start java -cp. -Djava.security.policy=java.policy - Djava.rmi.server.codebase= question2.aggregatorsend public static void main(string[] args) throws Exception { System.setSecurityManager(new RMISecurityManager()); AggregatorRMII<String> aggregator = (AggregatorRMII<String>)Naming.lookup("aggregator"); aggregator.send("un"); aggregator.send("deux"); aggregator.send("trois"); aggregator.send("quatre"); aggregator.send("cinq"); aggregator.send("six"); aggregator.send("sept"); finally{ //System.exit(0); Question3 (3 points) : Le Patron Aggregator / JMX package question3; import javax.management.notification; import javax.management.notificationbroadcastersupport; public class Aggregator<M extends Serializable> extends NotificationBroadcasterSupport implements AggregatorMBean<M>{ private static long sequencenumber = 0; private question1.aggregator<m> aggregator; public Aggregator(){ this.aggregator = new question1.aggregator<m>(); public boolean send(m message) throws boolean success = aggregator.send(message); if(!success){ System.out.println(" notification..."); sendnotification(new Notification( message.tostring(), this,sequencenumber++));

5 return success; public List<M> receive() throws return aggregator.receive(); public List<M> receive(long timeout) throws return aggregator.receive(timeout); public void setcapacity(int n){ aggregator.setcapacity(n); public int getcapacity(){ return aggregator.getcapacity(); public int size(){ return aggregator.size();

Remote Method Invocation

Remote Method Invocation A true distributed computing application interface for Java, written to provide easy access to objects existing on remote virtual machines Provide access to objects existing on