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My Understanding of HTTP Polling, Long Polling, HTTP Streaming and WebSockets

... great answers from others that cover a lot of ground. Here's a little bit extra. The only advantage of WebSockets over plugins like Java Applets, Flash or Silverlight is that WebSockets are natively built into browsers and does not rely on plugins. If by this you mean that you can use Java Ap...
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Can JavaScript connect with MySQL?

...d and write your data. As it accesses the data nodes directly, there is no extra latency from passing through a MySQL Server and need to convert from JavaScript code//objects into SQL operations. If for some reason, you’d prefer it to pass through a MySQL Server (for example if you’re storing ta...
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Error installing mysql2: Failed to build gem native extension

...erate views and controllers) rails generate scaffold city ID:integer Name:string CountryCode:string District:string Population:integer Edit the file c:\Sites\world\app\models\city.rb to look like this class City < ActiveRecord::Base set_table_name "city" end Edit the file c:\Sites\world\c...
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Error - trustAnchors parameter must be non-empty

...karounds as well, but those have their own side effects which will require extra future maintenance, for no payoff whatsoever. The next-best workaround is to add the row javax.net.ssl.trustStorePassword=changeit to the files /etc/java-9-openjdk/management/management.properties /etc/java-11-open...
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How can I get zoom functionality for images?

... public class TouchImageView extends ImageView { private static final String TAG = "Touch"; // These matrices will be used to move and zoom image Matrix matrix = new Matrix(); Matrix savedMatrix = new Matrix(); // We can be in one of these 3 states static final int NONE = 0...
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What is the difference between `git merge` and `git merge --no-ff`?

...author mentioned "specific branch topology" means that in --no-ff case an extra merge commit serves as the marker of the merge. The pros is explicit merge marker with names of the author and the merger. The cons is non-linear history that looks like a set of converging railroad tracks. A possible p...
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Android: Coloring part of a string using TextView.setText()?

... Use spans. Example: final SpannableStringBuilder sb = new SpannableStringBuilder("your text here"); // Span to set text color to some RGB value final ForegroundColorSpan fcs = new ForegroundColorSpan(Color.rgb(158, 158, 158)); // Span to make text bold fina...
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“static const” vs “#define” vs “enum”

...ironment for space to a concern. That said, neither enum nor #define uses extra space, per se. The value will appear in the object code as part of the instructions rather than being allocated storage in the data segment or in heap or on the stack. You'll have some space allocated for the static c...
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How to paginate with Mongoose in Node.js?

...this case, you can add the query page and/ or limit to your URL as a query string. For example: ?page=0&limit=25 // this would be added onto your URL: http:localhost:5000?page=0&limit=25 Since it would be a String we need to convert it to a Number for our calculations. Let's do it using...
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When to use setAttribute vs .attribute= in JavaScript?

...otice that though XML is explicitly case sensitive, the DOM spec calls for string names to be normalized, so names passed to getNamedItem are effectively case insensitive. Example Usage: var div = document.getElementsByTagName('div')[0]; //you can look up specific attributes var classAttr ...