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Is there a way to check if a file is in use?
...nderstand your hesitation about using exceptions, but you can't avoid them all of the time:
protected virtual bool IsFileLocked(FileInfo file)
{
try
{
using(FileStream stream = file.Open(FileMode.Open, FileAccess.Read, FileShare.None))
{
stream.Close();
}...
Logger slf4j advantages of formatting with {} instead of string concatenation
...
It is about string concatenation performance. It's potentially significant if your have dense logging statements.
(Prior to SLF4J 1.7) But only two parameters are possible
Because the vast majority of logging statements have 2 or fewer parameters, so SLF4J API up to version 1....
The quest for the Excel custom function tooltip
...ication.MacroOptions ( VBA6 ) ( VBA7 ), but this information does not actually appear as a tooltip, so it does not solve my problem.
...
Python argparse mutual exclusive group
...
add_mutually_exclusive_group doesn't make an entire group mutually exclusive. It makes options within the group mutually exclusive.
What you're looking for is subcommands. Instead of prog [ -a xxxx | [-b yyy -c zzz]], you'd have:
p...
what is the difference between ?:, ?! and ?= in regex?
...ng the pure regular expression. Perhaps I can but I would have to rely on callback functions.
– Y. Yoshii
May 16 '18 at 7:17
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Confusion: @NotNull vs. @Column(nullable = false) with JPA and Hibernate
...ts, but in most situations should correspond to them).
You should additionally use the JPA annotation like @Column(nullable = false) to give the jpa provider hints to generate the right DDL for creating table columns with the database constraints you want. If you can or want to rely on a JPA provi...
RESTful Authentication via Spring
.../>
<security:intercept-url pattern="/authenticate" access="permitAll"/>
<security:intercept-url pattern="/**" access="isAuthenticated()" />
</security:http>
<bean id="CustomAuthenticationEntryPoint"
class="com.demo.api.support.spring.CustomAuthenticationEntryPoin...
What's the difference between a Future and a Promise?
...
According to this discussion, Promise has finally been called CompletableFuture for inclusion in Java 8, and its javadoc explains:
A Future that may be explicitly completed (setting its value and status), and may be used as a CompletionStage, supporting dependent fu...
Python: Select subset from list based on index set
I have several lists having all the same number of entries (each specifying an object property):
5 Answers
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Difference between a Seq and a List in Scala
...tional programming. However, it has limitations and it's inadequate for parallel programming. These days, Vector is a better choice than List, but habit is hard to break.
Seq is a good generalization for sequences, so if you program to interfaces, you should use that. Note that there are actually t...