Лекция 3. «Message System»
public class Address {static private AtomicInteger abonentIdCreator = new AtomicInteger();final private int abonentId;
public Address(){this.abonentId = abonentIdCreator.incrementAndGet();
}
public int getAbonentId() {return abonentId;
}}
public interface Abonent {Address getAddress();
}
public abstract class Msg {final private Address from;final private Address to;
public Msg(Address from, Address to){this.from = from;this.to = to;
}
protected Address getFrom(){return from;
}
protected Address getTo(){return to;
}
public abstract void exec(Abonent abonent);}
public abstract class MsgToFrontend extends Msg {
public MsgToFrontend(Address from, Address to) {super(from, to);
}
public void exec(Abonent abonent) {if(abonent instanceof Frontend){
exec((Frontend)abonent);}
}
public abstract void exec(Frontend frontend);}
public class MsgUpdateUserId extends MsgToFrontend {
final private int sessionId;final private int userId;
public GameInfoMsg(Address from, Address to, int sessionId, int userId) {super(from, to);this. sessionId = sessionId;this. userId = userId;
}
public void exec(Frontend frontend) {frontend.updateUserId(sessionId, userId);
}}
private Map<Address, ArrayBlockingQueue<Msg>> messages = new HashMap<Address, ArrayBlockingQueue<Msg>>();
public void sendMessage(Msg message){Queue<Msg> messageQueue = messages.get(message.getTo());messageQueue.add(message);
}
public void execForAbonent(Abonent abonent) {Queue<Msg> messageQueue = messages.get(abonent.getAddress());while(!messageQueue.isEmpty()){
Msg message = messageQueue.poll();message.exec(abonent);
}}
public void run() {while (true) {
messageSystem.execForAbonent(this);Thread.sleep(TICK_TIME);
}}
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