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Java concurrency: Countdown latch vs Cyclic barrier
... your threads to wait until a certain callback has been called a number of times. You have no idea which threads the callback will be called on. In this case, a CountDownLatch is perfect, whereas I can't think of any way to implement this using a CyclicBarrier (actually, I can, but it involves timeo...
PG::ConnectionBad - could not connect to server: Connection refused
Every time I run my rails 4.0 server, I get this output.
32 Answers
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Jsoup SocketTimeoutException: Read timed out
I get a SocketTimeoutException when I try to parse a lot of HTML documents using Jsoup.
6 Answers
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How to set initial value and auto increment in MySQL?
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Heh, time passes by... Sure, define it in CREATE TABLE if you are able to do that. The second "ALTER TABLE" part of answer implies that you have already created a table, and it is probably already deployed somewhere without proper...
git recover deleted file where no commit was made after the delete
...le deleted files? Running git reset HEAD <<filename>> multiple times would be cumbersome, any efficient way to get it done?
– SubSul
May 10 '16 at 6:14
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Why is the Windows cmd.exe limited to 80 characters wide?
...never had it hurt anything (even in the days of 128mb machines and the one time you need it, you'll REALLY be glad you set it before hand. The width is a personal preference, I don't like seeing line wraps from my compiler except under extreme conditions, but others don't ever like to scroll.
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Why use static_cast(x) instead of (int)x?
...e language, or an appropriate constructor that makes it possible. The only time it's a bit risky is when you cast down to an inherited class; you must make sure that the object is actually the descendant that you claim it is, by means external to the language (like a flag in the object). A dynamic_c...
Update git commit author date when amending
... amend the last commit, and update its author date to the current date and time, you can do:
git commit --amend --date="$(date -R)"
(The -R parameter to date tells it to output the date in RFC 2822 format. This is one of the date formats understood by git commit.)
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How to form tuple column from two columns in Pandas
... this as I need to zip 10 columns and don't want to give dataframe name 10 times. Just want to give Column names.
– rishi jain
Aug 16 '19 at 7:26
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How do I ignore files in Subversion?
... ways of specifying file patterns. Here's a summary with examples:
1 - Runtime Configuration Area - global-ignores option:
This is a client-side only setting, so your global-ignores list won't be shared by other users, and it applies to all repos you checkout onto your computer.
This setting is d...