infinitereactivestreams | Hello everyone | Reactive Programming library

 by   gabrieljeremiahcampbell Java Version: Current License: No License

kandi X-RAY | infinitereactivestreams Summary

kandi X-RAY | infinitereactivestreams Summary

infinitereactivestreams is a Java library typically used in Programming Style, Reactive Programming applications. infinitereactivestreams has no bugs, it has no vulnerabilities and it has low support. However infinitereactivestreams build file is not available. You can download it from GitHub.

Hello everyone, I hope you are all doing well. In this post we will look at how to setup and consume infinite streams of data and then process and redistribute the data. We look at the use case of a broadcaster of stock price data, which could be the main stock market. This is consumed by an investment company that has clients who subscribe to this information know as the subscribers. So the StockPriceBroadcaster is the provider. I use only one broadcaster here but we could extend the use case to multiple broadcasters. This is then consumed by the investment company’s application called InfiniteReactiveStreams. The consumed stock market data is then processed and distributed to it’s clients, who are the investor subscribers. We call one such subscriber InvestorSubscriber. Once again we could have a number of investor subscribers. The InfiniteReactiveStreams will “pull” data from a the StockPriceBroadcaster. This data will then be processed and sent to the InvestorSubscriber. The important question to ask is, why do we use reactive streams? Well the StockPriceBroadcaster sends frequent broad casts of stock market prices. These prices are available for a short period of time and no historical results are stored – maybe due to volume of storage on their system. So the Investment company at a given frequency must pull the stock price data in a timely manner. However the InvestorSubscriber might not be able to keep up with the data at the same pace that it is sent because the InvestorSubscriber might be performing analysis on the incoming data, for example Machine learning such as timeseries analysis to influence buy/sell decisions of the investor subscriber’s portfolio. This analysis of the results takes more time than the consumption of the results. This delay introduces the concept of backpressure and the need for replay of recent values – hence Reactive Streams are a suitable candidate technology for such a use case. In this tutorial we are going to use the RxJava3 Reactive Streams implementation. Most notably we will use RxJava3 specific features such as replay on Flowables(The RxJava3 terminology for a stream of data). Even though the source of data is a Hot observable we are pulling that data periodically hence we are using a cold observable with backpressure to store the hot observable data. We present two applications in this tutorial. The main application with the all the functionality is the InfiniteReactiveStreams application and the second is just a small Spring-maven-java application that exposes a REST endpoint to GET stock prices.
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            kandi-support Support

              infinitereactivestreams has a low active ecosystem.
              It has 1 star(s) with 0 fork(s). There are 1 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              infinitereactivestreams has no issues reported. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of infinitereactivestreams is current.

            kandi-Quality Quality

              infinitereactivestreams has no bugs reported.

            kandi-Security Security

              infinitereactivestreams has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

            kandi-License License

              infinitereactivestreams does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              OutlinedDot
              Without a license, all rights are reserved, and you cannot use the library in your applications.

            kandi-Reuse Reuse

              infinitereactivestreams releases are not available. You will need to build from source code and install.
              infinitereactivestreams has no build file. You will be need to create the build yourself to build the component from source.
              Installation instructions are not available. Examples and code snippets are available.

            Top functions reviewed by kandi - BETA

            kandi has reviewed infinitereactivestreams and discovered the below as its top functions. This is intended to give you an instant insight into infinitereactivestreams implemented functionality, and help decide if they suit your requirements.
            • Starts the infinite stream
            • Starts a streaming stream
            • Get the singleton subscriber
            • Set the subscription
            • Returns a string representation as a string
            • Gets the value of this entry
            • Gets the id
            • Fetch stock stats summary
            • Gets the subscription
            • Request n items
            • Add a stock to the list
            • Displays the stock prices
            • The main application
            • This method cancels the scheduler
            • This method is called when the application completes
            • Log an error
            Get all kandi verified functions for this library.

            infinitereactivestreams Key Features

            No Key Features are available at this moment for infinitereactivestreams.

            infinitereactivestreams Examples and Code Snippets

            No Code Snippets are available at this moment for infinitereactivestreams.

            Community Discussions

            QUESTION

            How to use RXJS to share a pool of resources between multiple consumers
            Asked 2022-Mar-31 at 12:55

            How can we divide work of consumers over a limited set of resources in RXJS?

            I have a Pool class here (simplified):

            ...

            ANSWER

            Answered 2022-Mar-31 at 12:55

            So the main thing is you need to share the actual part that does the work, not only the resources.

            Here's a solution from me:

            https://stackblitz.com/edit/rxjs-yyxjh2?devToolsHeight=100&file=index.ts

            Source https://stackoverflow.com/questions/71689376

            QUESTION

            How to implement the logic without state variables
            Asked 2022-Mar-23 at 18:10

            There are two observables: the first named activator emits booleans. The second named signaler emits void events. There's a function f() which must be called under the next conditions:

            If the last event from activator is true, and event from signaler comes, call f(). Otherwise (the last activator's event is false, or activator has not yet emitted anything), "remember" that signaler sent the event. As soon as activator emits true, call f() and clear "remembered" flag.

            Example:

            ...

            ANSWER

            Answered 2022-Mar-23 at 18:10

            You need a state machine, but you can contain the state so you aren't leaving the monad... Something like this:

            Source https://stackoverflow.com/questions/71590666

            QUESTION

            Caching parallel request in Spring Webflux Mono
            Asked 2022-Mar-10 at 21:09

            We are using spring webflux (project reactor), as part of the requirement we need to call one API from our server.

            For the API call, we need to cache the response. So we are using Mono.cache operator.

            It caches the response Mono and the next time the same API call happens, it will get it from the cache. Following is example implementation

            ...

            ANSWER

            Answered 2022-Mar-03 at 14:54

            You can initialize the Mono in the constructor (assuming it doesn't depend on any request time parameter). Using cache operator will prevent multiple subscriptions to the source.

            Source https://stackoverflow.com/questions/71311319

            QUESTION

            Mirror at most 1 value from source, then temporarily drop values until another observable emits
            Asked 2022-Jan-20 at 13:05

            I would like to combine two observables in such a way that

            • I mirror at most 1 value from the source observable (same moment it arrives),
            • Then ignore its subsequent values until the notifier observable emits;
            • Then, I allow to mirror at most 1 more value from the source;
            • After which I again ignore elements until the notifier observable emits
            • etc.

            Source:

            ...

            ANSWER

            Answered 2022-Jan-20 at 13:05

            I believe this is a simple use case of the throttle() operator.

            Source https://stackoverflow.com/questions/70786489

            QUESTION

            Project Reactor: buffer with parallel execution
            Asked 2021-Dec-10 at 14:44

            I need to copy date from one source (in parallel) to another with batches.

            I did this:

            ...

            ANSWER

            Answered 2021-Dec-04 at 19:50

            You need to do your heavy work in individual Publisher-s which will be materialized in flatMap() in parallel. Like this

            Source https://stackoverflow.com/questions/70083756

            QUESTION

            UseCases or Interactors with Kt Flow and Retrofit
            Asked 2021-Dec-06 at 15:34

            Context

            I started working on a new project and I've decided to move from RxJava to Kotlin Coroutines. I'm using an MVVM clean architecture, meaning that my ViewModels communicate to UseCases classes, and these UseCases classes use one or many Repositories to fetch data from network.

            Let me give you an example. Let's say we have a screen that is supposed to show the user profile information. So we have the UserProfileViewModel:

            ...

            ANSWER

            Answered 2021-Dec-06 at 14:53

            The most obvious problem I see here is that you're using Flow for single values instead of suspend functions.

            Coroutines makes the single-value use case much simpler by using suspend functions that return plain values or throw exceptions. You can of course also make them return Result-like classes to encapsulate errors instead of actually using exceptions, but the important part is that with suspend functions you are exposing a seemingly synchronous (thus convenient) API while still benefitting from asynchronous runtime.

            In the provided examples you're not subscribing for updates anywhere, all flows actually just give a single element and complete, so there is no real reason to use flows and it complicates the code. It also makes it harder to read for people used to coroutines because it looks like multiple values are coming, and potentially collect being infinite, but it's not the case.

            Each time you write flow { emit(x) } it should just be x.

            Following the above, you're sometimes using flatMapMerge and in the lambda you create flows with a single element. Unless you're looking for parallelization of the computation, you should simply go for .map { ... } instead. So replace this:

            Source https://stackoverflow.com/questions/70246942

            QUESTION

            DT: Dynamically change column values based on selectinput from another column in R shiny app
            Asked 2021-Nov-15 at 09:56

            I am trying to create a table (with DT, pls don't use rhandsontable) which has few existing columns, one selectinput column (where each row will have options to choose) and finally another column which will be populated based on what user select from selectinput dropdown for each row.

            in my example here, 'Feedback' column is the user dropdown selection column. I am not able to update the 'Score' column which will be based on the selection from 'Feedback' column dropdown.

            ...

            ANSWER

            Answered 2021-Sep-30 at 14:31

            I'd suggest using dataTableProxy along with replaceData to realize the desired behaviour. This is faster than re-rendering the datatable.

            Furthermore, re-rendering the table seems to be messing around with the bindings of the selectInputs.

            Also please note: for this to work I needed to switch to server = TRUE

            Source https://stackoverflow.com/questions/69344974

            QUESTION

            Send a list of objects one at time in reactive way
            Asked 2021-Oct-18 at 21:46

            I'm receiving a request through a rest controller method with an object that I'm then passing to a method in the service layer.

            The object in this request contains a list as follows:

            ...

            ANSWER

            Answered 2021-Oct-18 at 16:21

            The expected way to do that is to actually use the fromIterable method and provide your List:

            Source https://stackoverflow.com/questions/69618904

            QUESTION

            Changing the target of a `whenever` block from the inside
            Asked 2021-Oct-07 at 10:20

            The following code attempts to react to one Supply and then, based on the content of some message, change its mind and react to messages from a different Supply. It's an attempt to provide similar behavior to Supply.migrate but with a bit more control.

            ...

            ANSWER

            Answered 2021-Oct-07 at 10:20

            I tend to consider whenever as the reactive equivalent of for. (It even supports the LAST loop phaser for doing something when the tapped Supply is done, as well as supporting next, last, and redo like an ordinary for loop!) Consider this:

            Source https://stackoverflow.com/questions/69475222

            QUESTION

            How to apply back pressure with Combine buffer operator to avoid flatMap to ask an infinite demand upstream?
            Asked 2021-Oct-05 at 15:18

            I'm trying to use Combine to do several millions concurrent request through the network. Here is a mock up of the naive approach I'n using:

            ...

            ANSWER

            Answered 2021-Oct-05 at 15:18

            The issue appears to be a Combine bug, as pointed out here. Using Publishers.Sequence causes the following operator to accumulate every value sent downstream before proceeding.

            A workaround is to type-erase the sequence publisher:

            Source https://stackoverflow.com/questions/69424516

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install infinitereactivestreams

            You can download it from GitHub.
            You can use infinitereactivestreams like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the infinitereactivestreams component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .

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            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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