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How to send a message to a particular client with socket.io
I'm starting with socket.io + node.js, I know how to send a message locally and to broadcast socket.broadcast.emit() function:- all the connected clients receive the same message.
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How can you represent inheritance in a database?
...problems identified for the single table method:
Mandatory attributes can now be enforced with NOT NULL.
Adding a new subtype requires adding a new table instead of adding columns to an existing one.
There is also no risk that an inappropriate attribute is set for a particular subtype, such as th...
How do I get currency exchange rates via an API such as Google Finance? [closed]
Now, I did find the Google Finance API and started looking through that but I found a lot of info about portfolios, transactions, positions & other stuff I know nothing about.
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Why use AJAX when WebSockets is available?
I've been using WebSockets for a while now, I have chosen to create an Agile project management tool for my final year project at University utilizing Node server and WebSockets. I found using WebSockets provided a 624% increase in the number of requests per second my application could process.
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Coding Conventions - Naming Enums
... I started naming my enums that way, but for readability, I have now been using Fruit.Apple instead of Fruit.APPLE.
– Walter White
Jun 18 '10 at 14:00
38
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Android: Expand/collapse animation
...o I post my actual solution. The main advantage is that you don't have to know the expanded height to apply the animation and once the view is expanded, it adapts height if content changes. It works great for me.
public static void expand(final View v) {
int matchParentMeasureSpec = View.Measur...
Scala Programming for Android
...er for mobile applications. Additionally, the IDE runs out of memory every now and then. I assume dex is not made for big libraries like the scala-library .
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Docker build “Could not resolve 'archive.ubuntu.com'” apt-get fails to install anything
...un Docker build on various files which previously worked before, which are now no longer working.
14 Answers
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JPA CascadeType.ALL does not delete orphans
... all child elements
delete main row
close session
With JPA 2.0, you can now use the option orphanRemoval = true
@OneToMany(mappedBy="foo", orphanRemoval=true)
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Why is my Git Submodule HEAD detached from master?
...date <rebase|merge>
In the common cases, you already have fixed by now your DETACHED HEAD since it was related to one of the configuration issues above.
fixing DETACHED HEAD when .update = checkout
$ cd <submodule-path> # and make modification to your submodule
$ git add .
$ git comm...