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Useful example of a shutdown hook in Java?
...e AtomicBoolean (or volatile boolean) "keepRunning" to false
(Optionally, .interrupt the working threads if they wait for data in some blocking call)
Wait for the working threads (executing writeBatch in your case) to finish, by calling the Thread.join() method on the working threads.
Terminate the ...
How to create an array of 20 random bytes?
...
Java 7 introduced ThreadLocalRandom which is isolated to the current thread.
This is an another rendition of maerics's solution.
final byte[] bytes = new byte[20];
ThreadLocalRandom.current().nextBytes(bytes);
...
PostgreSQL create table if not exists
...mplemented in Postgres 9.1:
CREATE TABLE IF NOT EXISTS myschema.mytable (i integer);
For older versions, here is a function to work around it:
CREATE OR REPLACE FUNCTION create_mytable()
RETURNS void
LANGUAGE plpgsql AS
$func$
BEGIN
IF EXISTS (SELECT FROM pg_catalog.pg_tables
...
Jsoup SocketTimeoutException: Read timed out
... 30 seconds.
As has already been mentioned, this can be set using timeout(int millis)
Also, as the OP notes in the edit, this can also be set using timeout(0). However, as the javadocs state:
A timeout of zero is treated as an infinite timeout.
...
Efficient way to insert a number into a sorted array of numbers?
I have a sorted JavaScript array, and want to insert one more item into the array such the resulting array remains sorted. I could certainly implement a simple quicksort-style insertion function:
...
What is output buffering?
...erything is buffered. there is an optional second parameter to ob_start(), int $chunk_size, which, if set, will cause the buffer to be flushed after any output call which causes the buffer's length to equal or exceed this size.
– ax.
May 14 '10 at 7:24
...
The performance impact of using instanceof in Java
...easily obtained, is never considered marginal and I believe the same viewpoint should prevail in software engineering", nearly all his work was about efficiency of algorithms and he wrote algorithms in assembly to (inter alia) achieve better performance. Meh...
– kgadek
...
What programming practice that you once liked have you since changed your mind about? [closed]
...
Single return points.
I once preferred a single return point for each method, because with that I could ensure that any cleanup needed by the routine was not overlooked.
Since then, I've moved to much smaller routines - so the likelihood o...
What are the pros and cons of the leading Java HTML parsers? [closed]
... provides a slick API to traverse the HTML DOM tree to get the elements of interest.
Particularly the traversing of the HTML DOM tree is the major strength of Jsoup. Ones who have worked with org.w3c.dom.Document know what a hell of pain it is to traverse the DOM using the verbose NodeList and Node ...
Declaration suffix for decimal type
... language specification, chapter 2.4.4:
float f = 1.2f;
double d = 1.2d;
uint u = 2u;
long l = 2L;
ulong ul = 2UL;
decimal m = 2m;
Nothing for int, byte, sbyte, short, ushort.
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