[Javagroups-development] jgroups threads and exceptions

[Bruce S. <bsc...@gm...>]

Since there can be a lot of threads in a JGroups stack, it might be useful to put them in one or
more thread groups to better control them.  One thing that I often do with this is implement
uncaughtException in the thread group so I can see why a thread died.
 
For instance, in Util there could be a static threadgroup:
 
    /**
     * ThreadGroup to which JGroups threads belong
     */
    private static ThreadGroup GROUP = new
      ThreadGroup("JGroups Threads") {
        public void uncaughtException(Thread t, Throwable e) {
          StringWriter sw = new StringWriter();
          sw.write("uncaught exception in thread ");
          sw.write(t.getName());
          LogFactory.getLog(JChannel.class).error("ThreadGroup: " + sw.toString(), e);
        }
      };

    public static ThreadGroup getThreadGroup() {
        return GROUP;
    }
 
and then, in Protocol and other places, use the group in creating threads
 
    public UpHandler(...) {
        super(Util.getThreadGroup(), "tempname");
        this.mq=mq;
        etc.