Edit: So i'm trying to connect to a IRC server using AIR3.0. No matter what, i always get
:server_ip NOTICE AUTH :*** Looking up your hostname...
:server_ip NOTICE AUTH :*** Found your hostname (cached)
ERROR :Closing Link: [server_ip] (Ping timeout)
Here is just a bunch of code :
private function handleSocketData(__e:ProgressEvent):void {
receiveData();
}
private function receiveData():void{
var str:String =_socket.readUTFBytes(_socket.bytesAvailable);
txt.text += str;
}
private function sendData(__str:String):void{
_socket.writeUTFBytes(__str);
_socket.flush();
}
I just do a classic _socket.connect(server_ip, server_port); and i have a bunch of listeners for the socket like ProgressEvent.SOCKET_DATA, Event.CLOSE, Event.CONNECT ...
Nothing fancy.
But no matter what, i can connect to the irc server, but it always stops at Found your hostname then nothing happens (no more data is sent my way) and i get a disconnection a few seconds after...
AIR doesn't require a socket policy, only Flash does, so that's not your issue here. Unfortunately I can't tell you what the real problem is based on the information you've posted. Please provide more details and maybe someone can tell you what the real problem is.
Related
I have a Sparkjava app which I have deployed on a Tomcat server. It uses SQL2O to interface with the MySQL-database. After some time I start to have trouble connecting to the database. I've tried connecting directly from SQL2O, connecting through HikariCP and connecting through JNDI. They all work for about a day, before I start getting Communications link failure. This app gets hit a handful of times a day at best, so performance is a complete non issue. I want to configure the app to use one database connection per request. How do I go about that?
The app doesn't come online again afterwards until I redeploy it (overwrite ROOT.war again). Restarting tomcat or the entire server does nothing.
Currently every request creates a new Sql2o object and executes the query using withConnection. I'd be highly surprised if I was leaking any connections.
Here's some example code (simplified).
public class UserRepositry {
static {
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
protected Sql2o sql2o = new Sql2o("jdbc:mysql://mysql.server.name/dbname?serverTimezone=UTC", "username", "password");
public List<Users> getUsers() {
return sql2o.withConnection((c, o) -> {
return c.createQuery(
"SELECT\n" +
" id,\n" +
" name\n" +
"FROM users"
)
.executeAndFetch(User.class);
});
}
}
public class Main {
public static void main(String[] args) {
val gson = new Gson();
port(8080);
get("/users", (req, res) -> {
return new UserRepository().getUsers();
}, gson::toJson);
}
}
If you rely on Tomcat to provide the connection to you: It's coming from a pool. Just go with plain old JDBC and open that connection yourself (and make sure to close it as well) if you don't like that.
So much for the answer to your question, to the letter. Now for the spirit: There's nothing wrong with connections coming from a pool. In all cases, it's your responsibility to handle it properly: Get access to a connection and free it up (close) when you're done with it. It doesn't make a difference if the connection is coming from a pool or has been created manually.
As you say performance is not an issue: Note that the creation of a connection may take some time, so even if the computer is largely idle, creating a new connection per request may have a notable effect on the performance. Your server won't overheat, but it might add a second or two to the request turnaround time.
Check configurations for your pool - e.g. validationQuery (to detect communication failures) or limits for use per connection. And make sure that you don't run into those issues because of bugs in your code. You'll need to handle communication errors anyways. And, again, that handling doesn't differ whether you use pools or not.
Edit: And finally: Are you extra extra sure that there indeed is no communication link failure? Like: Database or router unplugged every night to connect the vacuum cleaner? (no pun intended), Firewall dropping/resetting connections etc?
I have built a complex AIR application which has been successfully running for quite some time of many PCs. Unfortunately, I have a plaguing problem with internet connectivity and I was wondering if anyone had encountered this issue before.
Every once in a while, the program will completely stop talking to the internet (all services start faulting). I wrote special code in my program to monitor the situation in which I use two different services to contact the same server.
The first service:
var req:URLRequest = new URLRequest("myURL.com");
this.urlMonitor = new URLMonitor(req, [200, 304]); // Acceptable status codes
this.urlMonitor.pollInterval = 60 * 1000; // Every minute
this.urlMonitor.addEventListener(StatusEvent.STATUS, onStatusChange);
this.urlMonitor.start();
private function onStatusChange(e:StatusEvent):void
{
if (this.urlMonitor.available)
{
pollStatusOnline = true;
Online = true;
}
else
{
pollStatusOnline = false;
Online = false;
}
}
The secondary method is a normal HTTP Service call:
checkInService = new HTTPService();
checkInService.method = "POST";
checkInService.addEventListener(ResultEvent.RESULT,sendResult);
checkInService.addEventListener(FaultEvent.FAULT, faultResult);
checkInService.addEventListener(InvokeEvent.INVOKE, invokeAttempt);
checkInService.url = "myURL.com";
checkInService.concurrency = Concurrency.LAST;
checkInService.send(params);
These two services point to the same location and work 98% of the time. Sometimes, after a few hours, I have noticed that both services no longer can connect to the website. The HTTP Service returns a StatusCode 0. I am able to open command prompt and ping the server directly with no problem from the PC which is failing. The services will not function again until the program is restarted.
I have been working on this issue for many months now without resolution. If anyone is able to even point me in a somewhat possible, maybe this might be the problem, possibly, direction, I would really appreciate it.
Thank you in advance.
Check the code value of the StatusEvent you receive from the URLMonitor - this might give more info than the HTTPService (you might also want to try passing a null value to URLMonitor constructor, to widen the acceptable status codes).
If you have access to the server(s?) in question, check their logs. Could the server config have changed such that it might now consider such frequent requests as flooding?
You should also be able to use an HTTP debugger like Fiddler or Charles on the client machine to see more information about the requests going out of your application.
Created an windows service which saves all received and sent emails to my local drive and my service successfully does that.I have also resubscribed my streaming subscription onDisconnect event and Onerror event also.But my service stops responding after some time and there is no exception catched even though i have handled everything properly.Saw other forum and found the same issue people facing but there is not proper solution.
static private void OnDisconnect(object sender, SubscriptionErrorEventArgs args)
{
try
{
// Cast the sender as a StreamingSubscriptionConnection object.
StreamingSubscriptionConnection connection = (StreamingSubscriptionConnection)sender;
if (!connection.IsOpen)
connection.Open();
}
static void OnError(object sender, SubscriptionErrorEventArgs args)
{
// Cast the sender as a StreamingSubscriptionConnection object.
StreamingSubscriptionConnection connection = (StreamingSubscriptionConnection)sender;
if (!connection.IsOpen)
connection.Open();
}
Is this something to do with the Microsoft bug or it requires any settings on Exchange server for changing the limits for EWS subscription.
Even i checked below something related to throttling limit but no success:
http://msdn.microsoft.com/en-us/library/exchange/hh881884(v=exchg.140).aspx
Thanks a million in advance.
We have exactly same issue. And we do re-create whole subscription in OnError event just in case. It is also interesting that multiple application instances running on separate boxes exhibit identical behavior: at some point they just stop receiving notifications. Restarting any and all of them doesn't help; they do successfully subscribe but still no notifications other than OnDisconnect. Restarting Exchange Server is what really helps, though for a while.
I can see that the problem here is that you are trying to open the connection in the OnError handler. The problem here is that when OnError happen, the connection normally loses all the subscriptions, so you might need to consider creating the subscriptions again before opening them.
My application requires that I am able to abort/close a URLLoader instance at any point in the post-connect stage; that is, regardless if I have connected and the file transfer has already begun, or whether I have connected, and the file transfer has yet to commence (the server has not begun sending the file yet).
Here is my code:
var myTextLoader:URLLoader = new URLLoader();
myTextLoader.load(new URLRequest("myText.txt"));
This is what I have noticed:
When I connect to a server, and the server starts sending the file immediately, DURING the actual file transfer, if I invoke myTextLoader.close(), it aborts immediately. This is expected. I can monitor this by executing the SWF in Firefox,and noticing that when I issue the close(), the network connecion goes from Pending to aborted.
However, if I connect to the server, and the file transfer has not actually begun yet (I have confirmed the connect event has fired, and the server has simply not begun sending the file), then myTextLoader.close() has no effect. Only AFTER the first bytes start being transferred from the server, will .close() have any effect. I can verify the connection is stuck in Pending in Firebug.. .close() has no effect until the transfer has started.
Any ideas how to work around this issue? I need to be able to invoke .close() and have the connection torn down regardless of the connection stage.
First thing I would think of, is create a bool "aborted" that is set to true where the close() method is invoked.
Like :
function abort():void {
_aborted = true;
myTextLoader.close();
}
Then check for its value anywhere in the onProgress event or any similar event, to actually call the URLLoader close() method again whenever its value is true...
function onProgress(evt:ProgressEvent):void {
if (_aborted) {
myTextLoader.close();
}
}
Its not a pretty thing and is an ugly workaround, but this could work, since when the first bits are actually received, you'll know if you already wanted to close it or not.
Did you find any bug report on that anywhere ?... I doubt it could be an intended behavior...
3rd party AS3 HTTPClient (https://github.com/gabriel/as3httpclient) appears to not exhibit this issue with close().
I want to launch a local exe-file (without saving it to another location first) upon clicking on a link on a local html file.
It either needs to work in IE, Firefox, Chrome or Opera, I don't care. It's just for a presentation tomorrow.
It's simply not possible. If it was, it would be considered a security flaw and fixed. On Firefox within hours, on IE within some months.
UPDATE: You could try registering your custom protocol: http://openwinforms.com/run_exe_from_javascript.html
But I believe the browser will still prompt you whether you want to run the app.
I want to share my experience.
The accepted response says that it is not possible but it is quite possible indirectly.
If you want to execute an exe on a pc, it means that you have acces on this pc and you can install your exe on that machine.
In my case, I had to take a 3D scan from a 3D scanner via a web application. It seemed impossible at the beginning.
After lots of research, I found that we can send socket messages via javascript.
It means that if we had an application which listens a specific port, it can communicate with a website.
Let's explain how I did this.
In my web application, I created a javascript method like this :
function openCapron3DScanner(foot) {
$("#div-wait").show();
//Creates a web socket pointed to local and the port 21000
var ws = new WebSocket("ws://127.0.0.1:21000");
ws.onopen = function () {
//Sends the socket message to the application which listens the port 21000
ws.send(foot + "-" + #ProjectHelper.CurrentProject.Proj_ID);
};
ws.onerror = function myfunction() {
$("#div-wait").hide();
alert("Erreur connection scanner.");
}
ws.onmessage = function (evt) {
//Receives the message and do something...
var received_msg = evt.data;
if (received_msg == "ErrorScan") {
alert("Erreur scan.");
}
else {
refreshCurrentProject();
}
};
ws.onclose = function () {
$("#div-wait").hide();
};
};
And I created a windows forms application who listens the localhost and port 21000.
This application is hidden, only shown in icon tray.
The only thing to do is to add the application on windows startup via code on the first load to assure that the next restart of windows it will be executed and listen the port.
private static WebSocketServer wsServer;
static WebSocketSession LastSession;
private void Form1_Load(object sender, EventArgs e)
{
wsServer = new WebSocketServer();
int port = 21000;
wsServer.Setup(port);
wsServer.NewMessageReceived += WsServer_NewMessageReceived;
wsServer.Start();
}
private static void WsServer_NewMessageReceived(WebSocketSession session, string value)
{
if (value.StartsWith("ScanComplete-"))
{
//If the scan is ok, uploads the result to the server via a webservice and updates the database.
UploadImage(value);
//Sends a confirmation answer to the web page to make it refresh itself and show the result.
if (LastMacSession != null)
LastMacSession.Send("ScanComplete");
}
else if (value == "ErrorScan")
{
//If the C++ application sends an error message
if (LastMacSession != null)
LastMacSession.Send("ErrorScan");
}
else//call the 3D Scanner from the web page
{
LastSession = session;//Keeps in memory the last session to be able to answer via a socket message
//Calls the C++ exe with parameters to save the scan in the related folder.
//In could be don in this same application if I had a solution to consume the scanner in C#.
var proc = System.Diagnostics.Process.Start(#"C:\Program Files\MyProjectFolder\MyScannerAppC++.exe", projectID + " " + param);
}
}
I hope it will help.
Use System.Diagnostics.Process.Start() method.
protected void LinkButton1_Click(object sender, EventArgs e)
{
System.Diagnostics.Process.Start("notepad.exe");
}
You'll have to use C#, but since that's on your post, it should work. You'll also need the full path, if the file is not in your environment path that's loaded in memory.
For a 'regular link' you'd still need to place this in an ASPX page.....
Click me
We're getting really fugly now though.
You can't run an exe file on a website. (First, if it's a Linux server, exe files won't run on it and second, if you're on a Windows server, your host would kill the program immediately. And probably terminate your account.)
That link (assuming it was Play Now!) will just allow your user to download the file. (C:\Program Files\World of Warcraft\ exists on your computer, but it doesn't exist on the web server.)
You could setup a custom protocol on your local OS, if it's Windows, in regedit.
Check out this and this.
Then you create a simple HTML page, and place a link, something like this :
Start!
Given that you registered your custom "presentation" protocol, and configured it correctly in the registry, the application should launch when you click that link.