Hi!
I'm trying to write an application client/server with HTTP protocol, in JAVA. I need:

- client connects to the server,and after that,
- server continuously sends data to the client (as soon as they can be obtained by an other server-side resource !! )

Client-side code is:

HttpURLConnectionis = httpConnection.getInputStream();

ObjectInputStream ois = new ObjectInputStream(is);
String toWrite=null;
do {
toWrite=(String)ois.readObject();
}
while(Thread.currentThread().isAlive());
is.close();

Server-side code (part of method DOGET() of a servlet) is:

ObjectOutputStream os= new ObjectOutputStream (response.getOutputStream());
Signal sig; // Signal is a Java CLASS containing String messages

int i=0;
while (i<10) {
sig = obs.getSignal(); // "obs" is a LinkedBlockingQueue!!!!
os.writeObject(new String(sig.getValue())); // sig.getValue() returns String
}

The problem is that data sent from server arrives to client ALL at the end of the while-cicle, and not one by one!

Istead, by using a code like this:

ObjectOutputStream os= new ObjectOutputStream (response.getOutputStream());
int j=0;
while(true){
os.writeObject(new String("\n SERVER: count"+j));
j++;
}

...data arrives one by one!

I made lots of tries, variously modifying the code..and I noticed that the problem is in using blocking methods
(in fact, the behaviour is same if forcing the current Thread to sleep - eg Thread.sleep(1000) -).

Where's the problem??


Are you saying that if you use a sleep instead of the queue, it still waits til the while LOOP has finished before sending to the client?

I'd recommend manually flushing the stream after each write (os.flush()? not sure of syntax - haven't done java in a very long TIME).