Web Service Polling

[Shane]

I have a particular requirement when I call a web service; I have to call the
web service, wait until the web service returns or my timeout expires
(whichever is sooner) and exit.

I tried to use the MSDN example to poll a web service and abort it after a
specified timeout.
Have a look at the code below:
/* Set the timeout in seconds*/
int Timeout = 20;

/* create an instance of the web service proxy*/
POLL.Service1 WS = new POLL.Service1;

/* The SleepForInterval method on the web service takes an int and sleeps
the thread by the int interval (in millisecods). */
IAsyncResult ar = WS.BeginSleepForInterval(10000), null, null);
DateTime start = DateTime.Now;
while (ar.IsCompleted == false)
{
DateTime elapsed = DateTime.Now;
TimeSpan ts = elapsed - start;
if (ts.TotalSeconds > Timeout )
{
WS.Abort();
}
}

---

What I have found is that the code snippet does not behave as expected, ie
the IsCompleted flag NEVER gets set to true, even though I know that the web
service call has completed. It just loops for ever in the while loop until
the the abort statement gets called.

Any help would be appreciated.
--
Regards
----------------
Shailen Sukul
MCSD MCAD

"Imagination is more important than knowledge." - Einstein

"Gravitation is not responsible for people falling in love." - Eistein

[Shane]

sorry need to ensure that break was called after abort.

/* Set the timeout in seconds*/
int Timeout = 20;

/* create an instance of the web service proxy*/
POLL.Service1 WS = new POLL.Service1;

/* The SleepForInterval method on the web service takes an int and sleeps
the thread by the int interval (in millisecods). */
IAsyncResult ar = WS.BeginSleepForInterval(10000), null, null);
DateTime start = DateTime.Now;
while (ar.IsCompleted == false)
{
DateTime elapsed = DateTime.Now;
TimeSpan ts = elapsed - start;
if (ts.TotalSeconds > Timeout )
{
WS.Abort();
break;
}
}

--
Regards
----------------
Shailen Sukul
MCSD.Net MCSD MCAD

"Imagination is more important than knowledge." - Einstein

"Gravitation is not responsible for people falling in love." - Eistein

[Michael Nemtsev]

Hello Shane,

Hope this heps: http://www.yoda.arachsys.com/csharp/...latility.shtml

S> I have a particular requirement when I call a web service; I have to
S> call the web service, wait until the web service returns or my
S> timeout expires (whichever is sooner) and exit.
---
WBR,
Michael Nemtsev :: blog: http://spaces.msn.com/members/laflour

"At times one remains faithful to a cause only because its opponents do not
cease to be insipid." (c) Friedrich Nietzsche

[Shane]

I tried locking the object as follows, alas to no avail:

static IAsyncResult ar;
static readonly object stopLock = new object();

static bool IsCompleted
{
get
{
lock (stopLock)
{
return ar.IsCompleted;
}
}
}
/* Set the timeout in seconds*/
int Timeout = 20;

/* create an instance of the web service proxy*/
POLL.Service1 WS = new POLL.Service1;

/* The SleepForInterval method on the web service takes an int and sleeps
the thread by the int interval (in millisecods). */
ar = WS.BeginSleepForInterval(10000), null, null);
DateTime start = DateTime.Now;
while (IsCompleted == false)
{
DateTime elapsed = DateTime.Now;
TimeSpan ts = elapsed - start;
if (ts.TotalSeconds > Timeout )
{
WS.Abort();
break;
}
}

--
Regards
----------------
Shailen Sukul
MCSD.Net MCSD MCAD

"Imagination is more important than knowledge." - Einstein

"Gravitation is not responsible for people falling in love." - Eistein
"Michael Nemtsev" wrote:

Hello Shane,

Hope this heps: http://www.yoda.arachsys.com/csharp/...latility.shtml

S> I have a particular requirement when I call a web service; I have to
S> call the web service, wait until the web service returns or my
S> timeout expires (whichever is sooner) and exit.
---
WBR,
Michael Nemtsev :: blog: http://spaces.msn.com/members/laflour

"At times one remains faithful to a cause only because its opponents do not
cease to be insipid." (c) Friedrich Nietzsche