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Java executors: how to be notified, without blocking, when a task completes?

...blic class GetTaskNotificationWithoutBlocking { public static void main(String... argv) throws Exception { ExampleService svc = new ExampleService(); GetTaskNotificationWithoutBlocking listener = new GetTaskNotificationWithoutBlocking(); CompletableFuture<String> f = Completable...
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How do I base64 encode (decode) in C?

...re is the one from Jouni Malinen that I slightly modified to return a std::string: /* * Base64 encoding/decoding (RFC1341) * Copyright (c) 2005-2011, Jouni Malinen <j@w1.fi> * * This software may be distributed under the terms of the BSD license. * See README for more details. */ // 2016-12-...
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Continuous Integration for Ruby on Rails? [closed]

...lso RSpec, Cucumber, Jasmine, Konacha integrations, and supports arbitrary extra test commands) Integration with Rake and/or Capistrano (uses Rake to run commands and set up DBs, support continuous deployment using Capistrano or Heroku, or anything really) A web interface showing the status of the b...
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What is Weak Head Normal Form?

...thunks. In this case, t1 would be your 0 (or rather, a thunk to 0 given no extra unboxing) seq and $! evalute WHNF. Note that f $! x = seq x (f x) share | improve this answer | ...
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jQuery Get Selected Option From Dropdown

...ted').text(); or generically: $('#id :pseudoclass') This saves you an extra jQuery call, selects everything in one shot, and is more clear (my opinion). share | improve this answer | ...
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How to change node.js's console font color?

...\x1b[36m%s\x1b[0m', 'I am cyan'); //cyan console.log('\x1b[33m%s\x1b[0m', stringToMakeYellow); //yellow Note %s is where in the string (the second argument) gets injected. \x1b[0m resets the terminal color so it doesn't continue to be the chosen color anymore after this point. Colors reference ...
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How to check if an intent can be handled from some activity?

...n intent is not available, fun isIntentAvailable(context: Context, action: String?): Boolean { val packageManager = context.packageManager val intent = Intent(action) val resolveInfo: List<*> = packageManager.queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY) retu...
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MongoDB with redis

...fit from the flexibility of MongoDB for main persistent data, and from the extra features provided by Redis (low latency, item expiration, queues, pub/sub, atomic blocks, etc ...). It is indeed a good combination. Please note you should never run a Redis and MongoDB server on the same machine. Mong...
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Collections.emptyList() vs. new instance

...oo> always creates a new instance of the object so it has a very slight extra cost associated with it which may give you a reason to use Collections.emptyList. I like using emptyList just because it's more readable. shar...
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Value Change Listener to JTextField

... private static final long serialVersionUID = 1L; public static final String TEXT_PROPERTY = "text"; public CoolJTextField() { this(0); } public CoolJTextField(int nbColumns) { super("", nbColumns); this.setDocument(new MyDocument()); } @SuppressWa...