The document discusses various PureMVC command patterns in 3 sentences or less: SimpleCommand is the most basic command that can be extended. MacroCommand allows grouping multiple subcommands to execute together. AsyncCommand and AsyncMacroCommand allow asynchronous execution of commands to ensure subsequent commands do not execute until the previous one is complete.

1. 關於 PureMVC Command 的
那點事
Erin Lin
http://about.me/erinlin

2. 到處都有 Command...

3. Command 是？

4. Command 是？

5. Command 是？

6. Command 是？

7. Command
Command Command
Command
Command
Command
Command
不想學還是要學的
Command
命令 設計模式
Command Command
Command
Command Command
Command
Command

8. <<interface>>
ICommand
Controller execute():void
addCommand()
removeCommand()
//------------------- Command
doSomething()
execute():void

9. 真情推薦
傻瓜都可以看懂的設計模式入門書
自己上網去買!
http://www.oreilly.com.tw/product_java.php?id=a163

10. 回到 PureMVC...

11. PureMVC
兩個基本必知 Command

12. 最基本的
SimpleCommand

13. 反正要亂搞就是
extends
SimpleCommand

14. 你認識的第一支繼承 SimpleCommand 寫法
package com.mvc.controls
{
import org.puremvc.as3.interfaces.INotification;
import org.puremvc.as3.patterns.command.SimpleCommand;
public class StartupCommand extends SimpleCommand
{
public function StartupCommand()
{
super();
}
override public function execute(notification:INotification):void{
//初始 Application 要做的事情
//facade.registerMediator, facade.registerProxy
// or facade.registerCommand
//通常都會將 Application 傳進來做應用
}
}
}

15. 群組同時執行的
MacroCommand

16. 使用 MacroCommand 的 StartupCommand
package com.mvc.controls
{
import org.puremvc.as3.patterns.command.MacroCommand;
public class StartupCommand extends MacroCommand
{
public function StartupCommand()
{
super();
}
override protected function initializeMacroCommand() :void
{
addSubCommand( ModelPrepCommand );
addSubCommand( ViewPrepCommand );
addSubCommand( 你寫的Command );
}
}
}

17. 啊...我想要一個命令做完，
才要執行下一個....
最後還要來個完美的 Ending
要怎麼辦？

18. http://trac.puremvc.org/PureMVC_AS3/
PureMVC Utilities
使用的時候要心存感激喔！

19. 處理非同步的 AsyncCommand
http://trac.puremvc.org/Utility_AS3_AsyncCommand

20. 啥叫非同步？

21. 當然就是一件工作做完
才做下一個指令
照順序來不懂嗎？

22. AsyncCommand 也有
兩個 Class 給你用

23. AsyncCommand and
AsyncMacroCommand

24. 基本用法是以成組的方式應用

25. package controllers
{
import flash.utils.setTimeout;
import org.puremvc.as3.multicore.interfaces.ICommand;
import org.puremvc.as3.multicore.interfaces.INotification;
import org.puremvc.as3.multicore.patterns.command.AsyncCommand;
public class AsyncCommand0 extends AsyncCommand implements ICommand
{
public function AsyncCommand0()
{
super();
}
override public function execute(notification:INotification):void{
trace("lalala AsyncCommand0");
setTimeout( commandComplete, 1000);
}
}
}

26. package controllers
{
import
org.puremvc.as3.multicore.patterns.command.AsyncMacroCommand;
public class StartupCommand extends AsyncMacroCommand
{
public function StartupCommand()
{
super();
}
private function onComplete():void{
trace("end of StartupCommand");
}
override protected function initializeAsyncMacroCommand():void{
setOnComplete( onComplete );
addSubCommand( AsyncCommand0 );
addSubCommand( AsyncCommand1 );
addSubCommand( AsyncCommand2 );
}
}
}

27. AsyncCommand
DEMO

28. 所以 Command 可以做什麼？

29. 應用一：Assets loader

30. package controllers
{
import mx.rpc.AsyncToken;
import mx.rpc.IResponder;
import mx.rpc.http.HTTPService;
import org.puremvc.as3.multicore.interfaces.ICommand;
import org.puremvc.as3.multicore.interfaces.INotification;
import org.puremvc.as3.multicore.patterns.command.AsyncCommand;
public class LoadConfigCommand extends AsyncCommand implements IResponder
{
public function LoadConfigCommand()
{
super();
}
override public function execute(notification:INotification):void{
var service:HTTPService = new HTTPService;
service.resultFormat = 'xml';
service.url = "your configuration files url";
service.send();
}
public function result( result:Object ):void{
this.commandComplete();
}
public function fault( result:Object ):void{
//如果要中斷流程，需要在這邊傳出 ERROR notification 由其他 Command 處理
}
}

31. package controllers
{
import org.puremvc.as3.multicore.patterns.command.AsyncMacroCommand;
public class StartupCommand extends AsyncMacroCommand
{
public function StartupCommand()
{
super();
}
private function onComplete():void{
trace("end of StartupCommand");
sendNotification( "APP_INIT" );
}
override protected function initializeAsyncMacroCommand():void{
this.setOnComplete( onComplete );
addSubCommand( LoadConfigCommand );
addSubCommand( LoadAssetsCommand );
addSubCommand( LoadXXXCommand );
}
}
}

32. 應用二：做外掛...

33. package com.controls
{
public class GroupEditorCommand extends SimpleCommand implements ICommand
{
public function GroupEditorCommand()
{
super();
}
override public function execute(notification:INotification):void
{
switch( notification.getName() ){
case "GroupEditorCommand.INIT":
//將之前開發用的 proxy notification 組織起來
facade.registerCommand( "DataProxy.ITEM_UPDATED" , GroupEditorCommand );
facade.registerCommand( "XXXProxy.NOTIFICATION_NAME" , GroupEditorCommand );
showLoader();
//看你要做什麼起始
break;
case "DataProxy.ITEM_UPDATED":
//看要叫 proxy 做啥，還是 call 啥畫面出來
break;
}
}
private function clearCommands():void{
facade.removeCommand( "DataProxy.ITEM_UPDATED" );
facade.removeCommand( "XXXProxy.NOTIFICATION_NAME" );
removeLoader();
sendNotification( "GroupEditorCommand.CLOSE" );
}
private function showLoader( string:String ):void{
//將檔畫面的 loader call 到前景
}
private function removeLoader():void{
//remove loader
}
}
}

34. 其他？

35. 其實你要怎樣玩它
就開心的玩吧！
想太多就什麼都寫不出來了!

36. 最後...

37. 請保持愉快的心情
開心的寫程式吧！

38. FIN

39. 參考資料
• http://trac.puremvc.org/PureMVC_AS3/
• http://www.oreilly.com.tw/product_java.php?id=a163
• http://trac.puremvc.org/Utility_AS3_AsyncCommand