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From Oleg Kalnichevski <ol...@apache.org>
Subject Re: Detecting connection interruptions for uploads
Date Wed, 08 Oct 2008 15:18:08 GMT
On Tue, 2008-10-07 at 13:35 -0700, David Zhao wrote:
> Hi,
> 
> I'm using http-client 3.1 in a java desktop client. I've noticed an  
> issue with doing file uploads while getting connection interrupted,  
> for example, a wifi connection that is no longer available. When that  
> happens, my client would freeze in FilePart#sendData where it times  
> out in the write method of java Socket.
> 
> After digging around, I found this article:
> http://209.85.173.104/search?q=cache:7lA5d6FTgzYJ:https://lists.spline.inf.fu-berlin.de/lurker/message/20071121.145132.dd820d54.es.html+SocketOutputStream+does+not+time+out&hl=en&ct=clnk&cd=1&gl=us&client=safari
> 
> which describes:
> ------------------------------------
> AFAIKS, the actual problem here is:  
> java.net.SocketOutputStream.write() is
> always a blocking operation, and it is also not by the java socket API  
> to
> specify a timeout for write operations. Thus, it is simply not  
> possible to
> return from SocketOutputStream.write() until all data are transferred  
> or the
> TCP Stack gives up.
> ------------------------------------
> 
> Does anyone know of a work around for this issue?
> 

I suspect the only option would be to use a NIO based transport. 

Oleg

> Thanks,
> 
> -David
> 
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