Tutorial by Examples: r

This consumer is a low-level tool which allows you to consume messages from specific partitions, offsets and replicas. Useful parameters: parition: the specific partition to consume from (default to all) offset: the beginning offset. Use -2 to consume messages from the beginning, -1 to consume ...

This tool allows you to list, describe, or delete consumer groups. Have a look at this article for more information about consumer groups. if you still use the old consumer implementation, replace --bootstrap-server with --zookeeper. List consumer groups: kafka-consumer-groups --bootstrap-s...

On initial startup of your app, the FCM SDK generates a registration token for the client app instance. If you want to target single devices or create device groups, you'll need to access this token by extending FirebaseInstanceIdService. The onTokenRefresh callback fires whenever a new token is g...

// PHYSICS CONSTANTS struct PhysicsCategory { static let None : UInt32 = 0 static let All : UInt32 = UInt32.max static let player : UInt32 = 0b1 // 1 static let bullet : UInt32 = 0b10 // 2 } var nodesToRemove = [SKNode]() /...

This example uses the gson library to map java objects to json strings. The (de)serializers are generic, but they don't always need to be ! Serializer Code public class GsonSerializer<T> implements Serializer<T> { private Gson gson = new GsonBuilder().create(); @Over...

import gzip import os outfilename = 'example.txt.gz' output = gzip.open(outfilename, 'wb') try: output.write('Contents of the example file go here.\n') finally: output.close() print outfilename, 'contains', os.stat(outfilename).st_size, 'bytes of compressed data' os.system('file...

A very common use-case in web applications is performing multiple asynchronous (eg. HTTP) requests and gathering their results as they arrive or all of them at once (eg. in Angular2 with the HTTP service). 1. Gathering async responses one by one as they arrive This is typically done with mergeMap(...

Make a simple Hello World Example using your django. let's make sure that you have django installed on your PC first. open a terminal and type: python -c "import django" -->if no error comes that means django is already installed. Now lets create a project in django. For that write ...

In Unit Test layer we usually test the Business Layer functionalities. And in order to do this, we will remove the Data Layer (Entity Framework) dependencies. And the question now is: How can I remove the Entity Framework dependencies in order to unit test the Business Layer functions? And the ans...

class GuestsCleanupJob < ApplicationJob queue_as :default def perform(*guests) # Do something later end end

After installing Visual studio code configure .net core and C#. Configure C# based on market-place. Reference Url: C# market place .net core Launch Visual studio code. Press [ctrl + P] paste "ext install csharp" this and hit. Once done above steps , C# extension available i...

Create your new project folder and open in windows-command prompt with the location of project folder. Type "dotnet new -t web" and hit. This is for creating new mvc template. Once complete. GO to the project location and see basic mvc project has been created. The...

In our AppServiceProvider.php public function boot() { HasMany::macro('toHasOne', function() { return new HasOne( $this->query, $this->parent, $this->foreignKey, $this->localKey ); }); } Suppose we have shop modal and ...

Finding documentation for a feature is often as simple as a search using a good search engine. If that fails, or if unsure about specific terms, the Windows API Index can help locate specific features. Documentation for methods, interfaces, enumerations and constants can usually be found by searchin...

In Progress 4GL the normal way to write a special character is to preceed it with a tilde character (~). These are the default special characters SequenceInterpreted asComment~""Used to write " inside strings defined using "string".~''Used to write ' inside strings defined...

class SomeSerializer < ActiveModel::Serializer attribute :title, key: :name attributes :body end

A Mercator projection is one of the most recognizable projections used in maps. Like all map projections it has distortion and for a Mercator, projection this is most noticeable in the polar regions. It is a cylindrical projection, meridians run vertically and latitudes run horizontally. Scale depe...

function cryptPassword(password, callback) { bcrypt.genSalt(SALT_WORK_FACTOR, function(err, salt) { if (err) return callback(err); bcrypt.hash(password, salt, null, function(err, hash) { return callback(err, hash); }); }); } User.beforeCreate((user, options, ...

User.beforeCreate(function(user, options) { return hashPassword(user.password).then(function (hashedPw) { user.password = hashedPw; }); })

To run ARM assembly code you will need a machine with an ARM processor. If you are on Linux you can use the following commands to compile your program: as -o prog_object.o my_prog_source.s Link to get the executable: ld -o run_prog prog_object.o Run using: ./run_prog If you run echo $? it wil...