JADE学习笔记之三：行为

 

一个agent的行为表示它能够执行的任务，通过继承jade.core.behaviours.Behaviour来实现。然后在agent类中通过addBehaviour（）方法将行为加入进来。当一个agent启动（通过setup（）方法）后，行为可以在任何时间加入进来。

要定义Behaviour必须实现其action（）方法，它定义了agent的执行时的实际动作，而done（）方法指名了一个行为是否已执行完毕，是否要从行为池中删除。

 一个agent可以并发执行多个behaviour。每个agent线程启动后执行的过程如下：

实例：在netbeans工程中编写下列程序，过程如前所描述。

package examplesbehaviours;

import jade.core.Agent;

import jade.core.behaviours.Behaviour;

import jade.core.behaviours.CyclicBehaviour;

import jade.core.behaviours.OneShotBehaviour;

/**

 *

 * @author gj

 */

public class SimpleAgent extends Agent {

    private class FourStepBehaviour extends Behaviour {

        private int step = 1;

 

        public void action() {

            switch (step) {

                case 1:

                // Perform operation 1: print out a message

                    System.out.println("Operation 1");

                    break;

                case 2:

                    // Perform operation 2: Add a OneShotBehaviour

                    System.out.println("Operation 2. Adding one-shot behaviour");

                    myAgent.addBehaviour(new OneShotBehaviour(myAgent) {

                        public void action() {

                            System.out.println("One-shot");

                        }

                    });

                    break;

                case 3:

                    // Perform operation 3: print out a message

                    System.out.println("Operation 3");

                    break;

                case 4:

                // Perform operation 3: print out a message

                    System.out.println("Operation 4");

                    break;

             }

             step++;

        }

 

        public boolean done() {

            return step == 5;

        }

 

        public int onEnd() {

            myAgent.doDelete();

            System.out.println("Finished!");

            return super.onEnd();

        }

    }    // END of inner class FourStepBehaviour

    /** Creates a new instance of SimpleAgent */

    public SimpleAgent() {

    }

    protected void setup() {

        System.out.println("Agent "+getLocalName()+" started.");

 

        // Add the CyclicBehaviour

        addBehaviour(new CyclicBehaviour(this) {

            public void action() {

                System.out.println("Cycling");

            }

        }

        );

 

        // Add the generic behaviour

        addBehaviour(new FourStepBehaviour());

    }

   

 }

运行参数为 jade.Boot –gui guojie: examplesbehaviours.SimpleAgent

输出结果：Agent guojie started.

Cycling

Operation 1

Cycling

Operation 2. Adding one-shot behaviour

Cycling

Operation 3

One-shot

Cycling

Operation 4

Finished!