代理之间的确认消息

Confirmation msg between Agents

我有一个 Sender 从文件读取并将每一行发送给 Receiver 代理。

通常,我希望我的 Receiver 代理为接收到的每一行发送确认,并且 Sender 代理被阻止(或等待)直到收到该确认。

这是 Sender 代理的快照代码

private volatile boolean recieved = false;
// Codes and 

            while ((line = bufferedReader.readLine()) != null) {
                // SENDING LINES ...
                String Agentname="Sender";
                ACLMessage aclMessage= new ACLMessage(ACLMessage.CONFIRM);
                aclMessage.addReceiver(new AID(Agentname,AID.ISLOCALNAME));
                aclMessage.setContent(line);
                send(aclMessage);
                if (isRecieved() == false ) { block(); return; }
                System.out.println("Value after "+isRecieved());
            } 

用于接收 ACLMessages:

                    if (msg == null) {
                        block();
                        return;
                    }
                    else {

                        switch (msg.getPerformative()) {
// Other cases
                        case ACLMessage.INFORM:
                            System.out.println("Confirmation");
                            setRecieved(true);
                            break;

                        default:
                            break;
                        }

接收方代理在收到消息时发送确认

                case ACLMessage.CONFIRM:

                    // Process the results
                    String result = doNormalize (msg.getContent());
                    if (result!=null) {
                        //send the results to the writer
                        ACLMessage aclMessage= new ACLMessage(ACLMessage.CONFIRM);
                        aclMessage.addReceiver(new AID("Writer",AID.ISLOCALNAME));
                        aclMessage.setContent(result);
                        send(aclMessage);

// Sends a confirmation to using the method sendConfirmation
                        sendConfirmation(msg);
                    }
                    break;

                default:
                     break;
                    }
    // Code ..
    // ..
   // ..
   // ..

    public void sendConfirmation(ACLMessage aclMessage) {
    ACLMessage message = aclMessage.createReply();
    message.setPerformative(ACLMessage.INFORM);
    send(message);
}

所以发件人使用标志值来帮助确定是否收到确认。为此,它使用 isRecieved() 方法,如果它是 false,理想情况下应该阻止代理并等待确认消息。

问题是当我运行代码时,recieved() == falsetrueSender被阻塞,但它在收到确认后不会恢复 while 循环。我做错了吗?

我会用 switch 语句来做这个行为,像这样:

public class ReadBehaviour extends Behaviour {
   private boolean isDone = false;
   private int step = 0;
   private BufferedReader bufferedReader;

   @Override
   public void action() {
       switch (step){
           case 0:
               // TODO initialize your bufferedReader
               step++;
               break;
           case 1:
               try {
                   String line = bufferedReader.readLine();
                   if(line == null){
                       isDone = true;
                   } else {
                       ACLMessage aclMessage= new ACLMessage(ACLMessage.CONFIRM);
                       aclMessage.addReceiver(new AID("Sender", AID.ISLOCALNAME));
                       aclMessage.setContent(line);
                       myAgent.send(aclMessage);
                       step++;
                   }
               } catch (IOException e) {
                   isDone = true;
               }
               break;
           case 2:
               if(isRecieved()){
                   step--;
               } else {
                   block();
               }
       }
   }

   @Override
   public boolean done() {
       return isDone;
   }
}

要阻止特工的行为有多种方法:

  • receive() - 非阻塞接收,returns 队列中的第一条消息或 null 如果队列为空
  • receive(MessageTemplate pattern) - 与前一个行为类似,但您还可以指定消息的模式,例如特定的发件人 AID、会话 ID 以及组合。
  • blockingReceive() - 阻塞接收,阻塞代理直到消息出现在队列中
  • blockingReceive(MessageTemplate pattern) - 阻塞接收,模式

因此添加 blockingReceive()blockingReceive(MessageTemplate pattern) 会阻止代理 Behaviour 直到收到特定消息。看起来像这样:

            while ((line = bufferedReader.readLine()) != null) {
                // SENDING EVENT LINES ...
                String Agentname="Reciever";
                ACLMessage aclMessage= new ACLMessage(ACLMessage.CONFIRM);
                aclMessage.addReceiver(new AID(Agentname,AID.ISLOCALNAME));
                aclMessage.setContent(line);
                send(aclMessage);
                // Block an Agent until a confirmation is received..
                ACLMessage aclMessage2 = blockingReceive(mt);
            }