is DataOutputStream synchronized or not?

[Daniil Sosonkin]

Hello,

I'm wondering whether DataOutputStream is synchronizing all its writes. In my scenario I have a thread which sends out streaming data on DataOutputStream and then another thread which sends out a small ping to the client every minute or so. Should I synchronize my message output function?

Thanx

[sander hautvast]

java api doc says no synchronisation

[peter wooster]

Originally posted by Daniil Sosonkin:
Hello,

I'm wondering whether DataOutputStream is synchronizing all its writes. In my scenario I have a thread which sends out streaming data on DataOutputStream and then another thread which sends out a small ping to the client every minute or so. Should I synchronize my message output function?

Thanx

If one of these activities is streamed data, you will need to interrupt the stream to send your ping, which I assume is a keepalive. You should probably have the partner send a response every so often saying that they have received data and only send the keepalive if this response doesn't come within a particular time. If the ping isn't a keepalive, but serves some other purpose, you should use a second connection.