在Appengine中使用AMF通訊

 在試用了XML、JSON、AMF3後，最終不得不折服於AMF的高效率，AMF是個好東西，優點就不囉嗦了。在Google App Engine中使用AMF通訊其實也很簡單，只要加入PyAMF庫即可。
1、Python端：
Echo的樣本可以參考pyamf的官方文檔。下面的例子展示了如何運用PyAMF訪問資料庫並序號後返回給Flash端：

import datetime
import wsgiref.handlers

from pyamf.remoting.gateway.wsgi import WSGIGateway

from google.appengine.ext import db

def GetOwnerFlowers(platform, oid, max):
    flowers = FlowerModel.all().filter('pid =', platform).filter('oid =', oid).order('-date').fetch(max)
    return formatList(flowers)

def GetViewerFlowers(platform, oid, vid, max):
    flowers = FlowerModel.all().filter('pid =', platform).filter('vid =', vid).filter('oid =', oid).order('-date').fetch(max)
    return formatList(flowers)

def SaveFlower(data):
    flower = FlowerModel()
    flower.oid = data['oid']
    flower.oname = data['oname']
    flower.date = datetime.datetime.utcnow()
    flower.put()
    return True

def formatList(flowers, userCount, sysCount):
    list = []
    for flower in flowers:        
        result = {'oid':'', 'oname':'', 'date':''}
        result['oid'] = flower.oid
        result['oname'] = flower.oname
        result['date'] = flower.date
        list.append(result)
    return list

services = {
    'Garden.GetOwnerFlowers': GetOwnerFlowers,
    'Garden.GetViewerFlowers': GetViewerFlowers,
    'Garden.SaveFlower': SaveFlower
}

class FlowerModel(db.Model):
    oid = db.StringProperty() #owner id
    oname = db.StringProperty() #owner name
    date = db.DateTimeProperty() #created date
    
def main():
    application = WSGIGateway(services)
    wsgiref.handlers.CGIHandler().run(application)

if __name__ == '__main__':
    main()

2、Flash端不用做任何序號的操作：

package com.moorwind.fans.utils
{
  import com.moorwind.fans.core.Constant;
  import com.moorwind.fans.core.Context;
  import com.moorwind.fans.events.ServiceEvent;
  import com.moorwind.fans.vo.FlowerVO;
  
  import flash.events.Event;
  import flash.events.EventDispatcher;
  import flash.events.IOErrorEvent;
  import flash.events.SecurityErrorEvent;
  import flash.net.NetConnection;
  import flash.net.Responder;
  
  public class ServiceUtils extends EventDispatcher
  {
    private var conn:NetConnection = new NetConnection();
    
    public function ServiceUtils()
    {
      conn.connect(Constant.END_POINT);
      conn.addEventListener(IOErrorEvent.IO_ERROR, onConnectError);
      conn.addEventListener(SecurityErrorEvent.SECURITY_ERROR, onConnectError);
    }
    
    public function getOwner(oid:String, pid:int):void
    {
      var responder:Responder = new Responder(onGetOwner, onDataError);
      conn.call(Constant.GET_OWNERS, responder, pid, oid, Constant.LIMIT);
    }
    
    public function getViewer(oid:String, vid:String, pid:int):void
    {
      var responder:Responder = new Responder(onGetViewer, onDataError);
      conn.call(Constant.GET_VIEWERS, responder, pid, oid, vid, Constant.LIMIT);
    }
    
    public function saveFlower(flower:FlowerVO):void
    {
      var responder:Responder = new Responder(onSaveData, onDataError);
      conn.call(Constant.SAVE_FLOWERS, responder, flower);
    }
    
    private function onGetOwner(result:Object):void
    {
      Context.instance.ownerTotal = result.userCount;
      Context.instance.sysTotal = result.sysCount;
      var arr:Array = [];
      for each(var obj:Object in result.flowers)
      {
        var fl:FlowerVO = new FlowerVO();
        fl.oid = obj["oid"];
        fl.oname = obj["oname"];
        arr.push(fl);
      }
      var evt:ServiceEvent = new ServiceEvent(ServiceEvent.FLOWER_OWNER);
      evt.flowers = arr;
      dispatchEvent(evt);
    }
    
    private function onGetViewer(result:Array):void
    {
      var arr:Array = [];      
      for each(var obj:Object in result)
      {
        var fl:FlowerVO = new FlowerVO();
        fl.oid = obj["oid"];
        fl.oname = obj["oname"];
        arr.push(fl);
      }
      var evt:ServiceEvent = new ServiceEvent(ServiceEvent.FLOWER_VIEWER);
      evt.flowers = arr;
      dispatchEvent(evt);
    }
    
    private function onSaveData(result:Boolean):void
    {
      if(result)
      {
        dispatchEvent(new ServiceEvent(ServiceEvent.FLOWER_SAVED));
      }
    }
    
    private function onDataError(result:Object):void
    {
      trace(result);
    }
    
    public function onConnectError(e:Event):void
    {
      trace(e);
    }
    

  }
}

唯一不好的是。。。使用PYAMF佔用CPU太高，哎