Re: Strange Socket problem
On 1 mrt, 20:49, Knute Johnson <nos...@knutejohnson.com> wrote:
I'm having a problem in some production code that I can't figure out.
I'll post the complete actual code below. This code is running in thre=
e
places and has the same problem in two of them at the same time. The
other I'm not sure, it may be that the personnel operating it are
restarting the program and so don't complain. This piece of code is a
simple client that connects via a Socket to a server. The server
supplies some data and the client reads that data and files it away. I=
t
is supposed to restart itself if there is a connection failure or fault
for whatever reason. The problem is that at some random point in time
the Socket disconnects, the code logs the disconnect but never restarts.
It does print the "SportsWinClient Disconnected" message but never
executes the "fireconnectionEvent()" method after creating a new Socket.
It doesn't print any Exception message. I'm not sure how it gets o=
ut
of the try block without printing the "End of Stream" message or an
exception message.
The crazy part is that all night long when there is no activity from the
server it times out and restarts with no problems.
I'm hoping that somebody will see a fault in my code that could cause
the failure. It is not a compile problem so I left the formatting as i=
t is.
Thanks for looking.
package com.knutejohnson.xyzcasinos.translux;
import java.io.*;
import java.net.*;
import java.util.*;
import com.knutejohnson.classes.*;
import static com.knutejohnson.xyzcasinos.translux.Constants.*;
public class SportsWinClient implements Runnable {
private final Thread thread;
private volatile boolean isConnected;
private volatile boolean runFlag = true;
private volatile Socket socket;
public SportsWinClient() {
thread = new Thread(this,"SportsWinClient");
}
public void start() {
thread.start();
}
public void run() {
// boolean serverFlag = true;
System.out.println("SportsWinClient: Started");
while (runFlag) {
// String serverAddress = serverFlag ? SPORTS_WI=
N_IP_PRIMARY :
// SPORTS_WIN_IP_SECONDARY;
try {
// socket = new Socket(serverAddress,SPO=
RTS_WIN_PORT,
socket = new Socket(SPORTS_WIN_IP,SP=
ORTS_WIN_PORT,
InetAddress.getByName(REMOTE_IP),0);
socket.setKeepAlive(true);
isConnected = true;
********* I know that the line below is not being executed **********
fireConnectionEvent(ConnectionEvent.CO=
NNECTED);
socket.setSoTimeout(3600000); // on=
e hour timeout
System.out.println("SportsWinClient: C=
onnected");
InputStream is = socket.getInputStre=
am();
InputStreamReader isr = new InputStr=
eamReader(is);
BufferedReader br = new BufferedRead=
er(isr);
String str;
while ((str = br.readLine()) != nu=
ll) {
if (!str.matches("\\d+.*")) =
// not a sports record
continue;
SportsBet sb = new SportsBet=
(str);
SPORTS_BET_MAP.put(sb.betNumbe=
r,sb);
}
System.out.println("SportsWinClient: E=
nd of Stream");
} catch (IOException ioe) {
System.out.println("SportsWinClient: "=
+ ioe.toString());
} finally {
isConnected = false;
if (socket != null)
try {
socket.close();
} catch (IOException ioe) {
ioe.printStackTrace();
}
fireConnectionEvent(ConnectionEvent.DI=
SCONNECTED);
// serverFlag = !serverFlag;
*********** I know that the line below is being executed *************
System.out.println("SportsWinClient: D=
isconnected");
}
// stop interrupts this thread so this will be=
bypassed on
a stop
try {
Thread.sleep(10000);
} catch (InterruptedException ie) { }
}
System.out.println("SportsWinClient: Stopping");
}
public void disconnect() {
if (isConnected())
if (socket != null)
try {
socket.close();
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
public void stop() {
runFlag = false;
thread.interrupt();
if (socket != null)
try {
socket.close();
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
public boolean isConnected() {
return isConnected;
}
private final java.util.List<ConnectionListener> connectionLis=
teners =
new ArrayList<ConnectionListener>();
public synchronized void addConnectionListener(ConnectionListe=
ner cl) {
connectionListeners.add(cl);
}
public synchronized void
removeConnectionListener(ConnectionListener cl) {
connectionListeners.remove(cl);
}
private synchronized void fireConnectionEvent(int id) {
ConnectionEvent ce = new ConnectionEvent(this,id);
for (ConnectionListener listener : connectionListeners=
)
listener.connState(ce);
}
}
--
Knute Johnson
Like Steven I would suggest you add Catch Throwable to log the
information about any unexpected happening and make sure that you get
it from the log when it actually occurs. It should give you a clear
indication what to look for to solve the issue.
Kind regards, Paka