Re: Timeout Exceptions and the state of DataInputStream

Knute Johnson <>
Mon, 02 Apr 2012 14:14:05 -0700
On 3/28/2012 4:59 PM, Ivan Ryan wrote:

I was wondering how the DataInputStream class handles Socket timeouts.

For example, with code like the following:


DataInputStream in = new DataInputStream(someSocket.getInputStream());

long x = in.readLong()

What would happen if the stream times out when reading the long.
Would calling in.readLong() again give the correct value. This
assumes that the socket doesn't timeout the 2nd time.

I assume that since the DataInputStream could be reading one byte at a
time, it doesn't hold internal state. This would mean that a few
bytes of the long could be lost?

Another option is that the stream would "unread" the bytes or

I'm not sure why you would have a timeout of only 1 second but I would
not expect the socket to timeout if you were actually reading data.
Timeouts are typically designed to detect a lack of transmission of data
for a given period. For a system with a remote connection I would think
that 1 second could easily be too short a period.


Knute Johnson

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