我的理解:
命令池(采用堆或栈皆可)维护着一组命令集合。
只要这些命令实现同个命令接口或者命令抽象类,就能够被命令池依次执行。
class App
{
static void Main()
{
//命令模式:将无论哪个实例的方法抽象成对应的命令放入命令池。命令池会自动执行。
Printer printer = new Printer();
Scanner scanner = new Scanner();
PrintCommand pc = new PrintCommand(printer);
ScanCommand sc = new ScanCommand(scanner);
CommandQueue.Instance.Enquee(pc);
CommandQueue.Instance.Enquee(sc);
}
}
//ICommand命令池,计时器每过一段时间取出一个命令执行
public class CommandQueue : Queue<ICommand>
{
单例
private Timer _t;
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private CommandQueu()
{
_t = new Timer(new TimerCallback(Execute), null, 5000, 200);
}
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private void Execute(object obj)
{
if (this.Count > 0)
{
ICommand cmd = this.Dequeue();
cmd.Execute();
}
}
}
//所有命令的抽象,这里使用接口比较好
public interface ICommand
{
void Execute();
}
//打印机打印的命令
public class PrintCommand : ICommand
{
private Printer _printer;
public PrintCommand( Printer printer)
{
_printer = printer;
}
public virtual void Execute()
{
_printer.Print();
}
}
//扫描仪扫描的命令
public class ScanCommand : ICommand
{
private Scanner _scanner;
public ScanCommand(Scanner scanner)
{
_scanner = scanner;
}
public virtual void Execute()
{
_scanner.Scan();
}
}
//打印机提供打印方法
public class Printer
{
public void Print()
{
Console.WriteLine("Print.");
}
}
//扫描仪提供扫描方法
public class Scanner
{
public void Scan()
{
Console.WriteLine("Scan.");
}
}
命令池(采用堆或栈皆可)维护着一组命令集合。
只要这些命令实现同个命令接口或者命令抽象类,就能够被命令池依次执行。
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