第五章 JADE学习 - ACL消息模板

2020-05-11  本文已影响0人  2010jing

MessageTemplate

ACL是Aget通信的协议,它用功能或行为来定义通信,我们称之为通信行为。
接收消息时,MessageTemplate class 利用MessageTemplate可以针对ACLMessage的每个属性设置模式,以达到过滤消息的目的。为了可以构建更复杂的匹配规则,多个模式也可以进行and,or,not运算。最有用的一些规则或方法包括:通信行为匹配,发送者匹配,会话ID匹配。
由消息的目的、意图等不同,我们又将通信行为细分为多种,常见的有:

ACLMessage.INFORM:通知接收者

ACLMessage.REQUEST:请求接收者执行某些动作

ACLMessage.AGREE:同意执行某些动作

ACLMessage.FAILURE:通知另一个Agent尝试执某一行动作,但是失败

ACLMessage.PROPOSE:在一定前提下,接收执行某一特定动作的建议

还有发送者匹配MatchSender( AID ),会话匹配MatchConversationID( String ),通信协议匹配MatchProtocol( String ) ,本体匹配MatchOntology( String)。

比如如下模板,表示消息规则为INFORM的行为并且设置发送者为Sender。

MessageTemplate mt = MessageTemplate.and(
            MessageTemplate.MatchPerformative(ACLMessage.INFORM�),
            MessageTemplate.MatchSender(new AID("Sender", AID.ISLOCALNAME));

接收信息过程:

ACLMessage msg = receive(mt);

if (msg != null) { 
  //... handle message 
}

block();

简单例子:

package cn.bcrab.agent;

import jade.core.AID;
import jade.core.Agent;
import jade.core.behaviours.Behaviour;
import jade.core.behaviours.CyclicBehaviour;
import jade.lang.acl.ACLMessage;
import jade.lang.acl.MessageTemplate;

public class Template extends Agent{

    MessageTemplate mt = MessageTemplate.and(
      MessageTemplate.MatchPerformative(ACLMessage.INFORM),
      MessageTemplate.MatchSender(new AID("user1", AID.ISLOCALNAME))
    );

    @Override
    protected void setup() {

        ACLMessage msg = new ACLMessage(ACLMessage.INFORM);
        msg.setContent("有内鬼,终止交易!");

        // create two receivers
        msg.addReceiver(new AID("user1" ,AID.ISLOCALNAME ));
        msg.addReceiver(new AID("user2" ,AID.ISLOCALNAME ));

        send(msg);

        // set up behaviour 1
        Behaviour b1 = new CyclicBehaviour(this) {
            @Override
            public void action() {
                System.out.println("----------------Behaviour1---------------");
                ACLMessage msg = receive(mt);
                if (msg!=null){
                    System.out.println("Performative: "+msg.getPerformative());
                    System.out.println("Sender: "+msg.getSender().getLocalName());
                    System.out.println("Content: "+msg.getContent());
                }else{
                    System.out.println("Nothing");
                }
                System.out.println("--------------------Behaviour1 end----------------------");

                block();
            }
        };

        // set up behaviour 2
        Behaviour b2 = new CyclicBehaviour(this) {
            @Override
            public void action() {
                System.out.println("----------------Behaviour2---------------");
                ACLMessage msg = receive();
                if (msg!=null){
                    System.out.println("Performative: "+msg.getPerformative());
                    System.out.println("Sender: "+msg.getSender().getLocalName());
                    System.out.println("Content: "+msg.getContent());
                }else{
                    System.out.println("Nothing");
                }
                System.out.println("----------------Behaviour2 end---------------");

                block();
            }
        };

        this.addBehaviour(b1);
        this.addBehaviour(b2);
    }
}

package cn.bcrab.agent;

import jade.core.Agent;
import jade.core.behaviours.Behaviour;
import jade.core.behaviours.CyclicBehaviour;
import jade.lang.acl.ACLMessage;

public class Responder extends Agent {

    @Override
    protected void setup() {

        Behaviour b = new CyclicBehaviour(){
            @Override
            public void action() {
                ACLMessage msg = receive();
                if (msg != null){
                    System.out.println("xxxx");

                    ACLMessage reply = msg.createReply();
                    reply.setPerformative(ACLMessage.INFORM);
                    reply.setContent("收到!");
                    send(reply);

                    reply.setPerformative(ACLMessage.PROPOSE);
                    reply.setContent("Copy that!");
                    send(reply);
                }

                block();
            }
        };
        this.addBehaviour(b);


    }
}


相关代码

https://gitee.com/2010jing/JADE-tutorial/tree/tutorial05/


Reference

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