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我創建一個RSS北京時間要在一堆顯示器thoughout辦公室使用。此RSS Ticker將與Twiter Feed閱讀器，天氣小部件和時鐘一起運行，都在相同的.fla中。如何在使用UrlLoader時管理臨時網絡問題？
因爲有一噸的這些顯示器的，我不希望每一個到網上去的RSS，Twitter和天氣數據。所有這些數據都包含在從互聯網上下載的許多簡單的XML文件中。
我已經創建了我們的服務器上運行的Windows服務。該服務可以完成所有工作，只要觀看更新，並將新數據文件下載到我們網絡上的共享中即可。然後，我在所有顯示器上都有閃光燈儀表板從網絡副本中獲取他們的信息。這樣數據就會下載一次，而其他所有內容只是訪問這個本地緩存。
一切正常，但隨機的RSS股票將停止工作。我沒有任何辦法來遠程到這些顯示器，以檢查他們的錯誤日誌，但我得到我的本地測試環境完全相同的問題，當我拔掉我的以太網電纜。儀表板嘗試訪問網絡RSS副本，失敗，然後即使在重新建立連接後仍然會以計時器的每個滴答滴答失敗。
我希望能夠優雅地等待了一個斷開，那麼一旦重新連接顯示重新啓動RSS股票。我不知道如何做到這一點。下面是我的RSS相關的代碼：
// used to load a local xml file (stored in the same folder as the dashboard) that tells
// the dashboards which RSS feeds can be found on the network, and where they are located.
// It also contains the limits for how long each feed should be shown (both a time limit,
// and a maximimum number of feed items)
var rssListXMLLoader:URLLoader = new URLLoader();
rssListXMLLoader.addEventListener(Event.COMPLETE, rssListXMLLoaded);
rssListXMLLoader.addEventListener(IOErrorEvent.IO_ERROR, ioRSSListXMLLoaderErrorHandler);
// used to load the individual RRS feeds
var rssFeedXMLLoader:URLLoader = new URLLoader();
rssFeedXMLLoader.addEventListener(Event.COMPLETE, rssFeedXMLLoaded);
rssFeedXMLLoader.addEventListener(IOErrorEvent.IO_ERROR, ioRSSFeedXMLLoaderErrorHandler);
// rssListXMLData:XML and rssFeedXMLData:XML are used to store the XML data that is returned
// by the above loaders.
var rssListXMLData:XML = new XML();
var rssFeedXMLData:XML = new XML();
var currentRSSIndex:int = 2^10;
var currentFeedIndex:int = 2^10;
var currentLimit_Feeds:int = 2^10;
var currentLimit_Minutes:int = 2^10;
var limitStartTime:Number = new Date().time;
var gettingNewFeed = false;
// the blow Timer is used to keep the ticker moving. Each tick, it checks to see of the
// current RSS on sceen is has any text left. If it does, it removes the first letter
// causing the string to appear as if it is scrolling from right to left. If it has no
// more text, it gets the next feed.
var rssTickerTMR:Timer = new Timer(100, 0);
rssTickerTMR.addEventListener(TimerEvent.TIMER, updateRSSTicker);
rssTickerTMR.start();
updateRSSTicker();
function updateRSSTicker(e:Event = null):void
{
if(ins_rssContent.text.length == 0)
{
if(!gettingNewFeed)
{
gettingNewFeed = true;
getNewFeed();
}
}
else
{
ins_rssContent.text = ins_rssContent.text.substring(1);
}
}
// the below function checks to see if the RSS List is loaded. If it isn't it loads it,
// if it is already loaded, it calls the rssListXMLLoaded. This way, rssListXMLLoaded is
// never called unless the RSS List is already loaded.
function getNewFeed():void
{
if (rssListXMLData == "")
{
trace("Loading RSS List XML");
rssListXMLLoader.load(new URLRequest("rssFeeds.xml"));
}
else
{
rssListXMLLoaded();
}
}
// the below function manages which feed needs to be used from the list.
function rssListXMLLoaded(e:Event = null):void
{
if (e != null)
{
rssListXMLData = new XML(e.target.data);
}
currentFeedIndex++;
if (
currentFeedIndex >= rssFeedXMLData.channel["item"].length() ||
currentFeedIndex >= currentLimit_Feeds ||
new Date().time - limitStartTime >= (currentLimit_Minutes * 1000 * 60)
)
{
limitStartTime = new Date().time;
currentFeedIndex = 0;
currentRSSIndex++;
currentRSSIndex = (currentRSSIndex >= rssListXML.children().length()) ? 0 : currentRSSIndex;
currentLimit_Feeds = Number(rssListXMLData.RSSFeed[currentRSSIndex][email protected])
currentLimit_Minutes = Number(rssListXMLData.RSSFeed[currentRSSIndex][email protected])
}
try
{
rssFeedXMLLoader.load(new URLRequest(rssListXMLData.RSSFeed[currentRSSIndex]));
}
catch(e:Error)
{
trace("whoops, try again");
}
}
// the below function sets the text on the dashboard, and sets gettingNewfeed to false. This allows the
// rssTickerTMR:Timer to start removing the first letter of the newly added feed, causing the text to "scroll"
function rssFeedXMLLoaded(e:Event):void
{
rssFeedXMLData = new XML(e.target.data);
if (rssFeedXMLData.channel["item"].length() > 0)
{
var dateString:String = rssFeedXMLData.channel["item"][currentFeedIndex].pubDate;
var date:Date = new Date(Date.parse(dateString.replace(" Z","")));
if (date.toString() != "Invalid Date")
{
dateString = " @ " + FormatDate(date) + " " + FormatTime(date);
}
else
{
dateString = " @ " + dateString;
}
ins_rssTitle.text = rssFeedXMLData.channel.title + dateString;
ins_rssContent.text = " "
+ cleanDescription(rssFeedXMLData.channel["item"][currentFeedIndex].title) + " - "
+ cleanDescription(rssFeedXMLData.channel["item"][currentFeedIndex].description);
gettingNewFeed = false;
}
else
{
ins_rssContent.text = "";
gettingNewFeed = false;
}
}
// removes the things from the RSS content that I don't want.
function cleanDescription(p_string:String):String
{
if (p_string == null)
{
return '';
}
var str:String = p_string.replace(/<\/?[^>]+>/igm, ''); //remove html tags.
str = str.split("\r").join(". "); //replace line breaks with '. '
str = str.replace("\t"," "); //replace tabs with a single space.
str = str.replace(/(?:\.\s){2,}/g,". "); //replace multiple '. ' with a single one.
str = str.replace(/((https?|ftp|gopher|telnet|file|notes|ms-help):
((\/\/)|(\\\\))+[\w\d:#@%\/;$()~_?\+-=\\\.&]*)/igm, ' '); //replaces URL text with a single space
str = str.replace(/#[\w]{3,}/igm,' ') //replaces hash tags with a single space
str = str.replace(/\s{2,}/igm," "); //replace multiple spaces with a single space
return str;
}
function ioRSSListXMLLoaderErrorHandler(e:Event):void
{
trace("ioRSSListXMLLoaderErrorHandler:");
trace(e.toString());
}
// the idea below is that it sets the text to "" and sets gettingNewFeed to false, which should get the
// rssTickerTMR:Timer to try to get a band new feed. Theoretically, it should try and fail over and again
// until the network is once again accessible. This doesn't work at all.
function ioRSSFeedXMLLoaderErrorHandler(e:Event):void
{
trace("ioRSSFeedXMLLoaderErrorHandler:");
trace(e.toString());
ins_rssContent.text = "";
gettingNewFeed = false;
}
有誰知道一個更好的方式來處理這個？我將不勝感激任何你可能會提供的幫助。謝謝！
編輯！
至於建議的意志，我試圖創建一個基於定時器的網絡監控子系統。在我的RSS訂單處理器的IO_ERROR處理程序中，我停止了RSS計時器，並啓動網絡監視計時器。每10秒鐘，它會嘗試從服務器下載一個文件。它繼續這樣做直到它工作，此時它關閉自己的計時器，重新啓動RSS計時器。
在理論上應該工作。不僅如此，如果我將其更改爲下載網站而不是網絡文件，它確實可行。使用網絡文件時，一旦失敗，即使重新建立連接後，它仍會保持失敗。這裏是我的代碼：
...
function ioRSSFeedXMLLoaderErrorHandler(e:Event):void
{
rssTickerTMR.stop();
networkMonitorTMR.start();
trace("ioRSSFeedXMLLoaderErrorHandler:");
trace(e.toString());
ins_rssTitle.text = "Waiting for connection...";
ins_rssContent.text = "";
}
// netowrk monitor
var networkMonitorXMLLoader:URLLoader = new URLLoader();
networkMonitorXMLLoader.addEventListener(Event.COMPLETE, networkMonitorXMLLLoaded);
networkMonitorXMLLoader.addEventListener(IOErrorEvent.IO_ERROR, networkMonitorXMLLoaderErrorHandler);
var networkMonitorTMR:Timer = new Timer(10000,0);
networkMonitorTMR.addEventListener(TimerEvent.TIMER, checkNetwork);
function checkNetwork(e:Event = null):void
{
networkMonitorXMLLoader.load(new URLRequest("//server/share/file.xml"));
}
function networkMonitorXMLLoaderErrorHandler(e:Event = null) :void
{
trace("Still Off");
}
function networkMonitorXMLLLoaded(e:Event = null) :void
{
trace("Back On");
rssTickerTMR.start();
networkMonitorTMR.stop();
}
就像我說的，如果我轉「//server/shar/file.xml」到http://www.google.ca，它的工作原理。當我拔掉我的以太網，網絡監控器啓動時，當我插回，它切換回RSS ...但我的網絡資源，它只是仍然失敗......
將斷點在你networkMonitorXMLLoaderErrorHandler，並檢查了在變量面板中的事件的屬性，當你希望它是工作，我的猜測是，您使用的是互聯網的URI，而不是本地的，當獲得某種安全故障一。 – shaunhusain