Streams in Dart

Learn to create your own streams

Introduction

A stream is a sequence of results. You listen on a stream to get notified of the results (both data and errors) and of the stream shutting down. You can also pause while listening or stop listening to the stream before it is complete.

Ways to create streams

Transforming existing streams.

Creating a stream from scratch by using an async* function.

Creating a stream by using a StreamController.

Transforming an existing stream

The common way for creating streams is that you already have a stream, and you want to create a new stream based on the original stream’s events.

For example, you might have a stream of bytes that you want to convert to a stream of strings by UTF-8 decoding the input.

The most general approach is to create a new stream that waits for events on the original stream and then outputs new events.

// Splits a stream of consecutive strings into lines.
//
// The input string is provided in smaller chunks through
// the `source` stream.
Stream<String> lines(Stream<String> source) async* {
  // Stores any partial line from the previous chunk.
  var partial = '';
  // Wait until a new chunk is available, then process it.
  await for (var chunk in source) {
    var lines = chunk.split('\n');
    lines[0] = partial + lines[0]; // Prepend partial line.
    partial = lines.removeLast(); // Remove new partial line.
    for (var line in lines) {
      yield line; // Add lines to output stream.
    }
  }
  // Add final partial line to output stream, if any.
  if (partial.isNotEmpty) yield partial;
}

You can use Stream -supplied transforming methods such as map() , where() , expand() , and take() .

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Streams in Dart
Gerhard  Brink

Gerhard Brink

1622108520

Stateful stream processing with Apache Flink(part 1): An introduction

Apache Flink, a 4th generation Big Data processing framework provides robust **stateful stream processing capabilitie**s. So, in a few parts of the blogs, we will learn what is Stateful stream processing. And how we can use Flink to write a stateful streaming application.

What is stateful stream processing?

In general, stateful stream processing is an application design pattern for processing an unbounded stream of events. Stateful stream processing means a** “State”** is shared between events(stream entities). And therefore past events can influence the way the current events are processed.

Let’s try to understand it with a real-world scenario. Suppose we have a system that is responsible for generating a report. It comprising the total number of vehicles passed from a toll Plaza per hour/day. To achieve it, we will save the count of the vehicles passed from the toll plaza within one hour. That count will be used to accumulate it with the further next hour’s count to find the total number of vehicles passed from toll Plaza within 24 hours. Here we are saving or storing a count and it is nothing but the “State” of the application.

Might be it seems very simple, but in a distributed system it is very hard to achieve stateful stream processing. Stateful stream processing is much more difficult to scale up because we need different workers to share the state. Flink does provide ease of use, high efficiency, and high reliability for the**_ state management_** in a distributed environment.

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Teresa  Jerde

Teresa Jerde

1597452410

Spark Structured Streaming – Stateful Streaming

Welcome back folks to this blog series of Spark Structured Streaming. This blog is the continuation of the earlier blog “Internals of Structured Streaming“. And this blog pertains to Stateful Streaming in Spark Structured Streaming. So let’s get started.

Let’s start from the very basic understanding of what is Stateful Stream Processing. But to understand that, let’s first understand what Stateless Stream Processing is.

In my previous blogs of this series, I’ve discussed Stateless Stream Processing.

You can check them before moving ahead – Introduction to Structured Streaming and Internals of Structured Streaming

#analytics #apache spark #big data and fast data #ml #ai and data engineering #scala #spark #streaming #streaming solutions #tech blogs #stateful streaming #structured streaming

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How Much Does it Cost to Make an App like Netflix?

Knowing the influence of the internet in our lives today, it will be difficult to imagine our lives without it. There are a plethora of internet-based services that have revolutionized the world such as emails, blogs, social media and so many of them. The day we are today, would have not been the same, if these services were not available.

It reminds us of one such portal that has been entertaining us for many years. Netflix, which every individual loves to watch and enjoy. Not a lot of you know about it, Netflix came up in the world even before Google.

Factors Deciding the Cost of Netflix like Application

Having known such incredible thoughts about the application, learn about the factors that decide the cost of app like Netflix or YouTube.

App Features
The more the features, the more would have cost. It is better to keep only core features in version 1 of the app to reduce the cost. More features can be added in the next version once the app is geared up.

App Design
People do not like using complex applications. So it is important to keep design simple and standard. A simple design allows users to get the content they are looking for and helps them stay hooked to the application.

App Platform
There would be a considerable difference in the cost of application depending on the app platform such as Android and iOS. The applications developed on Android would be costlier than applications developed on iOS, as it needs to be considered for different devices and screen sizes.

App Developers
It is better to prefer India for development rather than in the US. Especially entertainment application companies like WebClues Infotech and AppClues Infotech are the most preferred companies to develop such kinds of applications.

Mobile Wallets
Prefer integrating mobile wallets into your app. It takes less time to make payments for users while eliminating a lot of payment hassles.

The world denotes Netflix as a commercial-free movie or TV show platform, which provides all the episodes of a series in a row, taking the viewing experience just to another level. Giving users the world of entertainment, it is accessible for multiple Android and iOS devices.

The rough estimate or approximate cost of developing an app like Netflix is $10,000 to $30,000 every platform. At AppClues Infotech, we are capable of developing the best app like Netflix or YouTube that can earn you more number of users.

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