/*
 * 創(chuàng)建日期 2005-2-26
 * 
 * TODO 要更改此生成的文件的模板，請轉(zhuǎn)至 窗口 － 首選項 － Java － 代碼樣式 － 代碼模板
 */
package simulator;

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.Label;
import java.awt.Panel;

import javax.swing.JPanel;

public abstract class Business extends JPanel implements Runnable {

	/**
	 * 
	 * @uml.property name="agent"
	 * @uml.associationEnd multiplicity="(0 -1)" inverse="business:simulator.Agent"
	 */
	protected Agent[] agent = new Agent[Simulator.NUM_AGENTS];


    // 建立NUM_AGENTS個數(shù)服務(wù)代理
    protected Label[] labelAgent = new Label[Simulator.NUM_AGENTS];

    //每個服務(wù)代理都有一個標(biāo)簽
    protected Label labelQueue = new Label("Customers waiting: 0");

    //用標(biāo)簽說明有多少個顧客在等待
    protected Label labelServed = new Label("Customers servers: 0");

    //用標(biāo)簽說明已服務(wù)了多少個顧客
    protected Label labelWait = new Label("Average wait: 0");

    //用標(biāo)簽說明平均有多少個顧客在等待
    protected int numAgents = Simulator.NUM_INITIAL_AGENTS;

    protected int numCustomer = 0; //該business的實際顧客數(shù)，開始時為0

	/**
	 * 
	 * @uml.property name="totalWait" 
	 */
	protected long totalWait = 0L; //總的等待時間，用于計算平均等待時間


    private Thread thread = null; //創(chuàng)建線程對象

    private boolean doorIsOpen = false;

    public Business(String title) //構(gòu)造方法
    {
        super();
        setup(title); //調(diào)用setup方法進(jìn)行初始化
    }

    //下面三個方法是有待實現(xiàn)的抽象方法
    public abstract void generateCustomer(); //產(chǎn)生一個顧客

    public abstract Customer requestCustomerFor(int ID); //接待一個顧客

    public abstract void updateDisplay(); //顯示當(dāng)前的服務(wù)狀態(tài)

	/**
	 * 
	 * @uml.property name="totalWait"
	 */
	public void checkoutCustomer(long waitTime) { //處理某個顧客付款
		numCustomer++; // 顧客數(shù)目增加1
		totalWait += waitTime; //累計等待的時間
	}

    public void addAgent() {
        if (numAgents < Simulator.NUM_AGENTS) //如果代理數(shù)沒有超過總數(shù)
        //則增加一個服務(wù)代理對象
        {
            agent[numAgents] = new Agent(this, numAgents);
            agent[numAgents].start(); //啟動這個線程對象
            numAgents++; //代理數(shù)目增加1
        }
    }

    public void retireAgent() //撤出一個代理
    {
        if (numAgents > 1) {
            agent[numAgents - 1].halt();
            numAgents--; //代理數(shù)目減少1
        }
    }

    public void start() //啟動各個服務(wù)代理開始服務(wù)
    {
        if (thread == null) {
            thread = new Thread(this);
            doorIsOpen = true;
            thread.start();
            for (int i = 0; i < numAgents; i++)
                agent[i].start();
        }
    }

    public void stop() //中止各個服務(wù)代理的服務(wù)
    {
        doorIsOpen = false;
        thread = null;
        for (int i = 0; i < numAgents; i++)
            agent[i].halt();
    }

    public void openDoor() //開始營業(yè);
    {
        doorIsOpen = true;
    }

    public void closeDoor() //停止?fàn)I業(yè);
    {
        doorIsOpen = false;
    }

    public void run() //線程的主體
    {
        while (thread == Thread.currentThread()) {
            try //在最大的無顧客到來的時間內(nèi)（隨機(jī)時間）
            {
                thread
                        .sleep((int) (Math.random() * Simulator.MAX_NO_CUSTOMERS));
                if (doorIsOpen) //如果在營業(yè)則產(chǎn)生一個顧客
                    generateCustomer();
                updateDisplay(); //更新后，重新顯示
            } catch (InterruptedException ie) {
                System.out.println("Business exception: " + ie);
            }
        }
    }

    private void setup(String title) { //初始化工作
        Panel agentPanel = new Panel(); //建立一個面板
        agentPanel.setLayout(new GridLayout(Simulator.NUM_AGENTS + 3, 1));
        //布局為GridLayout
        for (int i = 0; i < Simulator.NUM_AGENTS; i++) {
            labelAgent[i] = new Label("Agent " + i + ": served 0");
            agentPanel.add(labelAgent[i]); //每個格子放置一個服務(wù)代理標(biāo)簽
            agent[i] = new Agent(this, i); //給代理數(shù)組元素分配一個代理對象
        }
        for (int i = numAgents; i < Simulator.NUM_AGENTS; i++)
            labelAgent[i].setText("Agent " + i + ": inactive");
        //自numAgents之后的數(shù)組元素，都沒有分配代理對象
        agentPanel.add(labelQueue); //把顧客等待隊列的標(biāo)簽加到面板中
        agentPanel.add(labelServed); //把服務(wù)等待隊列標(biāo)簽加到面板中
        agentPanel.add(labelWait); //把平均等待時間的標(biāo)簽加到面板中
        setLayout(new BorderLayout());
        add("Center", agentPanel); //把面板放在布局的下方
        add("North", new Label(title)); //把標(biāo)題放在布局的下方
    }
}