Lighstreamer connection exception [iOS]

[DrAma]

Hello community,
I'm experiencing this kind of exception
2014-11-17 19:06:23.088 XXX[7431:607] Connecting to Lightstreamer...
2014-11-17 19:06:23.089 XXX[7431:972b] [LIGHTSTREAMER] Connection closed
2014-11-17 19:06:23.092 XXX[7431:3b03] *** Terminating app due to uncaught exception 'Lightstreamer connection exception', reason: 'Connection interrupted'
*** First throw call stack:
(
0 CoreFoundation 0x026ba1e4 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x01ab08e5 objc_exception_throw + 44
2 XXX 0x00139620 -[LSClient openConnectionWithInfo:delegate:] + 1011
3 XXX 0x000663f4 __54-[XXXNavigatorViewController connectToLightstreamer]_block_invoke + 68
4 libdispatch.dylib 0x036f37b8 _dispatch_call_block_and_release + 15
5 libdispatch.dylib 0x037084d0 _dispatch_client_callout + 14
6 libdispatch.dylib 0x036f6eb7 _dispatch_root_queue_drain + 291
7 libdispatch.dylib 0x036f7127 _dispatch_worker_thread2 + 39
8 libsystem_pthread.dylib 0x03a332e3 _pthread_wqthread + 801
9 libsystem_pthread.dylib 0x03a30eea start_wqthread + 30
)
libc++abi.dylib: terminating with uncaught exception of type LSPushConnectionException
The exception happens exactly while I'm doing a call to my back end web services using AFNetworking. IT's a systematic crash, what can be the cause?

[gianluca.bertani]

Hello,

the exception you see may be caused by a closeConnection called while the client is still connecting. It's not an error condition, you may avoid crashing by surrounding the openConnection call with a @try-@catch block, e.g.:


@try {
[client openConnectionWithInfo:info delegate:self];
// Connection established

} @catch (LSPushConnectionException *e) {
// Connection failed
}


Hope this helps. Don't hesitate to ask if your need more infos.
Best regards,

Gianluca

[DrAma]

Thanx Gianluca, it seems to work so far.
Best regards,
Andrea

[DrAma]

Thanx Gianluca, it seems to work so far.
Best regards,
Andrea

Even in the try-catch block, the app still crashes, with the same exception.
If I comment the light streamer apart everything works fine.
Probably this not the only part to put in a try catch block.

[gianluca.bertani]

Hello,

the library documentation specifies, for each API call, the exceptions it may throw. LSPushConnectionException may be raised in a number of situations, in particular when an API call is made that requires a connection (e.g. subscriptions, send messages, etc.) and there is no connection available. Check the documentation, and don't hesitate to ask if you have any doubt.

Best regards,

Gianluca

[DrAma]

Thank you Gianluca, we arranged wrapping almost every call to lighstreamer around a try-catch

[DrAma]

Since I'm using it for a while I can say that this library throws a lot of exception, that make really difficult to use it.
I wrapped almost avery call to the light streamer into a try catch, it doesn't feel good.
My suggestion is to change that behavior converting inside exceptions into NSError objects as most COCOA libraries does.
Best regards,
Andrea

[Alessandro]

Hi Andrea,

Thanks for your suggestions. We are taking them in serious consideration. We will ponder on this topic for a couple weeks. We will let you know any news on this.

Cheers,

Alessandro

[Alessandro]

The discussion goes on here: http://forums.lightstreamer.com/show...=9454#post9454