Re: "heartbeat" approach

Robert Klemme <>
Sat, 02 Feb 2013 00:13:04 +0100
On 01.02.2013 23:46, Arne Vajh=F8j wrote:

On 2/1/2013 11:11 AM, bob smith wrote:

What is the best way to handle a situation where you want a socket to
send a "heartbeat" every ten minutes? I was thinking it would be
simple to have a single thread do all the "heartbeat" sending.

However, that means there could be multiple threads writing to one
socket. Do I need to do anything special to have multiple threads
writing to one socket? Is there a better way?

You can certainly let the two writing thread synchronize on
Socket or OutputStream objects to make it thread safe.

Yes, _some_ form of synchronization is needed.

You could also funnel all writes through the same
thread (a writer thread) via some in memory data structure
(which you would then need to synchronize on).

The details of course depend on the nature of the heartbeat (e.g. can it =

be omitted if there was regular traffic in the meantime? How much delay =

for the heartbeat is allowed etc.).

The last option would end up as much more complex
code from start, but I believe that the design may
end up being preferable as the solution itself evolves.
Consider how many places you nee to change if you want to
switch from TCP to UDP.

We could certainly come up with better solutions if we had more
information about the scenario.

Kind regards


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