黑马程序员_交通灯系统

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/**
 *1，交通灯系统三要素：交通灯,交通灯控制器，路。
 *2，交通灯控制12调路线，四条主路线，四条跟随路线，四条自由路线。
 *3，交通灯控制器，设置初始灯，并控制交通灯的切换动作。
 *4，路拥有存储车辆和根据交通灯信号放行车辆的功能。
 */


import java.util.*;
import java.util.concurrent.*;

public class Traffic
{
	public static void main(String[] args)
	{
		String[] directions = 
			{"S2N","S2W","E2W","E2S",
			"N2S","N2E","W2E","W2N",
			"S2E","E2N","N2W","W2S"};
		for(int i=0;i<directions.length;i++)
		{
			new Road(directions[i]);
		}
		
		new LampController();
	}
}

enum Lamp
{
	S2N("N2S","S2W",false),S2W("N2E","E2W",false),
	E2W("W2E","E2S",false),E2S("W2N","S2N",false),
	N2S(null,null,false),N2E(null,null,false),
	W2E(null,null,false),W2N(null,null,false),
	S2E(null,null,true),E2N(null,null,true),
	N2W(null,null,true),W2S(null,null,true);

	private Lamp(String opposite,String next,boolean lighted)
	{
		this.opposite = opposite;
		this.next = next;
		this.lighted = lighted;
	}

	private boolean lighted;
	private String opposite;
	private String next;

	public boolean isLighted()
	{
		return lighted;
	}

	public void light()
	{
		this.lighted = true;
		if(opposite!=null)
		Lamp.valueOf(opposite).light();
		System.out.println(name()
			+" lamp is green,下面总共应该有6个方向能看到汽车驶过！");
	}

	public Lamp blackOut()
	{
		this.lighted = false;
		if(opposite!=null)
			Lamp.valueOf(opposite).blackOut();
		Lamp nextLamp = null;
		if(next!=null)
		{
			nextLamp = Lamp.valueOf(next);
			System.out.println("绿灯从"+name()+"------>切换为"+next);
			nextLamp.light();

		}
		return nextLamp;	
	}
}

class LampController
{
	private Lamp currentLamp;

	public LampController()
	{
		currentLamp = Lamp.S2N;
		currentLamp.light();

		ScheduledExecutorService timer = Executors.newScheduledThreadPool(1);
		timer.scheduleAtFixedRate(
			new Runnable(){
				public void run()
				{
					currentLamp = currentLamp.blackOut();
				}
			},
			10,
			10,
			TimeUnit.SECONDS
		);
	}
}

class Road
{
	private List<String> vehicles = new ArrayList<String>();
	private String name = null;
	public Road(String name)
	{
		this.name = name;
		ExecutorService pool = Executors.newSingleThreadExecutor();
		pool.execute(new Runnable(){
			public void run()
			{
				for(int i=1;i<1000;i++)
				{
					try
					{
						Thread.sleep((new Random().nextInt(10)+1)*1000);
					}
					catch (InterruptedException e)
					{
						e.printStackTrace();
					}
					vehicles.add(Road.this.name+"_"+i);
				}
			}
		});

		ScheduledExecutorService timer = Executors.newScheduledThreadPool(1);
		timer.scheduleAtFixedRate(
			new Runnable(){
				public void run()
				{
					if(vehicles.size()>0)
					{
						boolean lighted = Lamp.valueOf(Road.this.name).isLighted();
						if(lighted)
							System.out.println(vehicles.remove(0)+" is traversing !");
					}
				}
			},
			1,
			1,
			TimeUnit.SECONDS
		);
	}
}

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