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Useful example of a shutdown hook in Java?
...he docs:
When the virtual machine begins its shutdown sequence it will start all registered shutdown hooks in some unspecified order and let them run concurrently. When all the hooks have finished it will then run all uninvoked finalizers if finalization-on-exit has been enabled. Finally, the vi...
Java concurrency: Countdown latch vs Cyclic barrier
...barrier is reset and can be used again.
For simple use cases - services starting etc... a CountdownLatch is fine. A CyclicBarrier is useful for more complex co-ordination tasks. An example of such a thing would be parallel computation - where multiple subtasks are involved in the computation - ...
Simpler way to put PDB breakpoints in Python code?
...he macro. Then paste the macro contents into your vimrc file. For example, start macro with qd, then later "dp to paste. Finally assign your instructions to a register so always populated on vim loadup. Example: let @d = 'oimport pdb; pdb.set_trace()k0:w' Now, just use @d whenever you want to paste...
Why is a combiner needed for reduce method that converts type in java 8
...is accumulated, the final result is returned.
The parallel implementation starts off by splitting the stream into segments. Each segment is processed by its own thread in the sequential fashion I described above. Now, if we have N threads, we have N intermediate results. These need to be reduced do...
The difference between the Runnable and Callable interfaces in Java
...
(@prash - Also ... by starting to use Java in the Java 1.1 era.)
– Stephen C
Oct 23 '15 at 22:43
1
...
How to make exe files from a node.js app?
...e" app.js %*
Another alternative is this very simple C# app which will start Node using its own filename + .js as the script to run, and pass along any command line arguments.
class Program
{
static void Main(string[] args)
{
var info = System.Diagnostics.Process.GetCurrentProce...
“Failed to load platform plugin ”xcb“ ” while launching qt5 app on linux without qt installed
...
I tried to start my binary, compiled with Qt 5.7, on Ubuntu 16.04 LTS where Qt 5.5 is preinstalled. It didn't work.
At first, I inspected the binary itself with ldd as was suggested here, and "satisfied" all "not found" dependencies. Th...
Difference between break and continue statement
...
System.out.println ("starting loop:");
for (int n = 0; n < 7; ++n)
{
System.out.println ("in loop: " + n);
if (n == 2) {
continue;
}
System.out.println (" survived first guard");
if (n == 4) {
break;
}...
How to use redis PUBLISH/SUBSCRIBE with nodejs to notify clients when data values change?
...t.connect();
});
</script>
</body>
</html>
Start server
cd pbsb
node app.js
Start browser
Best if you start google chrome(because of websockets support, but not necessary). Visit http://localhost:3000 to see sample(in the beginning you don't see anything but P...
Automatic Retina images for web sites
... }
}
Usage sample:
.retina-background-image( "../references/Images/", "start_grey-97_12", ".png", 12px );
Ths requires you to have two files:
start_grey-97_12.png
start_grey-97_12@2x.png
Where the 2x file is double resolution for retina.
...