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How to listen for changes to a MongoDB collection?
I'm creating a sort of background job queue system with MongoDB as the data store. How can I "listen" for inserts to a MongoDB collection before spawning workers to process the job? Do I need to poll every few seconds to see if there are any changes from last time, or is there a way my script can wa...
Switch to another Git tag
How do I check out version version/tag 1.1.4 of the rspec bundle ?
2 Answers
2
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I lose my data when the container exits
...es you make to the container and then run it. Try this:
sudo docker pull ubuntu
sudo docker run ubuntu apt-get install -y ping
Then get the container id using this command:
sudo docker ps -l
Commit changes to the container:
sudo docker commit <container_id> iman/ping
Then run the co...
vertical & horizontal lines in matplotlib
I do not quite understand why I am unable to create horizontal and vertical lines at specified limits. I would like to bound the data by this box. However, the sides do not seem to comply with my instructions. Why is this?
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Java 8 stream reverse order
..., to)
.map(i -> to - i + from - 1);
}
This avoids boxing and sorting.
For the general question of how to reverse a stream of any type, I don't know of there's a "proper" way. There are a couple ways I can think of. Both end up storing the stream elements. I don't know of a ...
iPhone: Detecting user inactivity/idle time since last screen touch
Has anybody implemented a feature where if the user has not touched the screen for a certain time period, you take a certain action? I'm trying to figure out the best way to do that.
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How to correctly use the extern keyword in C
My question is about when a function should be referenced with the extern keyword in C.
10 Answers
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Do AJAX requests retain PHP Session info?
...ser logged onto my site, having his id stored in $_SESSION , and from his browser he clicked a 'Save' button which would make an AJAX request to the server. Will his $_SESSION and cookies be retained in this request, and can I safely rely on the id being present in the $_SESSION ?
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How do I delete unpushed git commits?
I accidentally committed to the wrong branch.
How do I delete that commit?
7 Answers
7...
install / uninstall APKs programmatically (PackageManager vs Intents)
...to keep track of what applications it has installed. Of course, this could be achieved by simply keeping a list of installed applications. But this should not be necessary! It should be the responsibility of the PackageManager to maintain the installedBy(a, b) relationship. In fact, according to the...