[Spread-users] Problem with Java client

[Jarosław Nozderko]

(Upgraded to Spread 3.17.3)

Experiments indicate that message from Java client
gets lost when SpreadConnection.disconnect() (which
sends KILL_MESS) is called immediately after 
SpreadConnection.multicast() and SpreadGroup.leave()
(which sends LEAVE_MESS). If program sleeps for a moment
(100-1000 ms) before calling disconnect(), message is delivered. 

I'm sending messages with my test client to spuser (C version).
If there is a delay between leave() and disconect(),
spuser gets the message and then reports membership 
message "Due to the LEAVE of" sender.

If there is no delay, message is *not* delivered and
after JOIN message spuser reports membership message
"Due to the DISCONNECT of" sender.

However, C client doesn't seem to exhibit such 
behavior - message is delivered even when SP_multicast(), 
SP_leave() and SP_disconnect() are called immediately,
without any delay and receiving spuser always gets
membership JOIN, the message itself and membership LEAVE
(not DISCONNECT) - this applies to both C spuser and
Java User tool.

I'm quite new to Spread, so I didn't dig into all papers
and the whole source code yet, but does anyone have an
idea what is the reason of this difference ? 
Unfortunately, I can't use ethereal or similar tool 
in this environment.

Regards,
Jarek

> 
> Hi,
> 
>  I have a problem with Spread Java client.
> This is probably some my basic mistake, but I'd be glad if 
> anyone could take a look at this.
> 
> I created Java client, like this:
> 
>  
> //------------------------------------------------------------
> ----------
>  // [1] Connecting:
>  SpreadConnection  spreadConnection = new SpreadConnection(); 
>  InetSocketAddress isa = new InetSocketAddress(spread_host, 
> spread_port);  InetAddress adr = isa.getAddress();  
> spreadConnection.connect(adr, 0, private_name, false, true);
>  
> //------------------------------------------------------------
> ----------
>  // [2] Joining:
>  String group = "grupa";
>  SpreadGroup spreadGroup = new SpreadGroup();  
> spreadGroup.join(spreadConnection, group);
>  
> //------------------------------------------------------------
> ----------
>  // [3] Sending message:
>  SpreadMessage msg = new SpreadMessage();  msg.setFifo();  
> String target = "grupa";  msg.addGroup(target);  
> //msg.addGroup(spreadGroup);  String text = "Hello from Java 
> !";  msg.setData(text.getBytes());  short type = 177;  
> msg.setType(type);  spreadConnection.multicast(msg);
>  
> //------------------------------------------------------------
> ---------------
>  // [4] Leaving:
>  spreadGroup.leave();
>  
> //------------------------------------------------------------
> ---------------
>  // [5] Disconnecting:
>  spreadConnection.disconnect();
>  
> //------------------------------------------------------------
> ---------------
> 
> If I don't join group "grupa" (sections [2] and [4] commented 
> out), sending message works - group members receive it. Of 
> course, there are no membership messages. But if I try to 
> send message to joined group (section [2] present, using 
> SpreadMessage.addGroup(String) or 
> SpreadMessage.addGroup(SpreadGroup)), group members get only 
> membership messages - the message itself is *not* delivered 
> (tried setReliable(),
> setUnreliable() and setFifo()).
> 
> Do I miss something obvious ? If not, can anyone confirm/deny this ?
> C client seem to work well, message is always delivered.
> 
> Spread version 3.17.2 on HP-UX B.11.11 U 9000/800, although 
> Java SpreadVersion.get*Version reports 3.16.1.
> 
> $ java -version
> java version "1.4.2.06"
> Java(TM) 2 Runtime Environment, Standard Edition (build 
> 1.4.2.06-041015-11:00) Java HotSpot(TM) Server VM (build 
> 1.4.2 1.4.2.06-041015-12:38-PA_RISC2.0 PA2.0 (aCC_AP), mixed mode)
> 
> Thanks for any help,
> Jarek
> 
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