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What is mutex and semaphore in Java ? What is the main difference?
...e system with a mutex so when 1 client is connected to that sub-system, no one else should have access. You can use a Semaphore for this purpose too. A mutex is a "Mutual Exclusion Semaphore".
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In Matlab, when is it optimal to use bsxfun?
...called "singleton expasion". As an aside, the singleton dimensions are the ones that will be dropped if you call squeeze.
It is possible that for very small problems, the repmat approach is faster - but at that array size, both operations are so fast that it likely won't make any difference in term...
What is the difference between map and flatMap and a good use case for each?
Can someone explain to me the difference between map and flatMap and what is a good use case for each?
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How do I create an empty array/matrix in NumPy?
...mally use a list. I want to create an empty array (or matrix) and then add one column (or row) to it at a time.
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What is N-Tier architecture?
...mmend it, you can host logical tier and database on the same box.
Edit: One implication is that presentation tier and the logic tier (sometimes called Business Logic Layer) needs to cross machine boundaries "across the wire" sometimes over unreliable, slow, and/or insecure network. This is very d...
Separate REST JSON API server and client? [closed]
...ble to be accessed from many different clients: front-end websites, smartphone apps, backend webservices, etc. So I really want a JSON REST API for each one.
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Spring classpath prefix difference
...lders in all your jars on the classpath will be picked up and joined into one big application context.
In contrast, classpath:conf/appContext.xml will load only one such file... the first one found on your classpath.
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Schema for a multilanguage database
...iple tables that each of them have translation like 3 level deep, and each one has 3 fields you need 3*3 9 left joins only for translations.. other wise 3. Also it is easier to add constraints etc and i beleive searching is more resonable.
– GorillaApe
May 1 '1...
Are GUID collisions possible?
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Basically, no. I think someone went mucking with your database. Depending on the version GUID you're using the value is either unique (for things like version 1 GUIDs), or both unique and unpredictable (for things like version 4 GUIDs). SQL Server's ...
One line if statement not working
... value. There is no need for the conditional operator to even exist, let alone use it.
BTW: it is customary to name methods which are used to ask a question with a question mark at the end, like this:
@item.rigged?
This shows another problem with using the conditional operator in Ruby:
@item.ri...