Mike Marchywka wrote:
> In the DayTime Server example I have, there appears to be a call
> to Thread.stop() ( on page 301 in Hunter/Crawford)to stop the
> daemon thread. Is this accepted procedure or is there a more recent
> edition?
> Do you guys have any comments on using Thread.stop()
> in general, not just in servlets? I do this, optionally, in
> applets when everything goes bad and the only apparent alternative
> is hanging a browser. How do you kill a thread stuck waiting to get
> into a synchronized block? Is this improved in 1.4?
>
> It doesn't look like there is really anything more dangerous about
> launching a thread
> from a servlet than from anything else(especially compared to an applet
> inside
> of an undetermined browser!).
>
> Thanks.
> [...]
Hello Mike, I found the following ways to "end" a loop-thread
from several books and emails, I am also trying to use it in
init/destroy or ServletContextListener of Servlet :-)
Class MyClass implements Runnable
Thread thisThread; //a reference to that endless-loop-Thread
volatile boolean isAlive; ..a flag
InputStream is(or socket) ; //Try(not sure) to end the io-loop by closing
is/socket
public void run(){
thisThread=Thread.currentThread();
while(true){ //or while(isAlive)
//way0
if(Thread.currentThread().isInterrupted()) return/break;
//way1
if(!isAlive) return/break;
//way2 to end sleep/join/wait by InterruptedException
try{
Thread.sleep()
or
Thread.join()
or
synchronized-Object.wait()
}catch(InterruptedException e) {return/break;}
//method3
try{
for io: I guess it is possible to end io by ending the
underlying
socket/stream, then catch the NullPointerException or other
Error/Exception.
}catch(...){return/break;}
}
}
//invoked by other Thread
public void synchronized end(){
if(is!=null) {is.close(); is=null;}
if(thisThread!=null && thisThread.isAlive()) {
thisThread.interrupt();}
isAlive=false; //end() method is a synchronized method, this can
re-confirm that
//isAlive is "visible" to that
endless-loop-Thread
}
}
just as a reference :-) have a nice day :-)
Bo
Aug.06, 2001
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