RxJavaDemo | Rxjava的基本使用 : 主要是被观察者 和观察者 | Reactive Programming library
kandi X-RAY | RxJavaDemo Summary
kandi X-RAY | RxJavaDemo Summary
###RxJava(函数式编程): #####源码解释:a library for composing asynchronous and event-based programs using observable sequences for the Java VM. 使用介绍说明如下: 1.基本方式1: 1》使用Observable的create()创建被观察者,重写call(),在该方法中调用观察者的onNext(),onCompleted(),onError()方法 2》new Subscriber (){}创建观察者,重写onNext()(输出信息),onCompleted(),onError() 3》被观察者Observerable对象调用subscribe(Subscriber对象);完成subscriber对observable的订阅. 基本方式2: 1》使用Observable的just()创建被观察者返回被观察者对象; 2》被观察者对象调用subscribe(new Action (){publid void call(T t){}}). 基本方式3: 1》使用Observable的from(T[] array)创建被观察者;(接收一个集合作为输入,然后每次输出一个元素给subscriber) 2》被观察者对象调用subscribe(new Action (){publid void call(T t){}}). ###2. RxJava的常用操作符的介绍: 1》map():把一个事件转换为另一个事件(用于变换Observable对象的,实现链式调用,最终将最简洁的数据传递给Subscriber对象) 示例:. 2》flatMap(): 1. 使用传入的事件对象创建一个 Observable 对象; 2. 并不发送这个 Observable, 而是将它激活,于是它开始发送事件; 3. 每一个创建出来的 Observable 发送的事件,都被汇入同一个 Observable, 而这个 Observable 负责将这些事件统一交给 Subscriber 的回调方法。 这三个步骤,把事件拆成了两级,通过一组新创建的 Observable 将初始的对象『铺平』之后通过统一路径分发了下去。而这个『铺平』就是 flatMap() 所谓的 flat。.
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Top functions reviewed by kandi - BETA
- The flatMap operation
- Gets the application name
- Gets the list of course references
- Setter for the name of the class
- Initialize the activity
- Returns instance of MyDiskCache
- Concatenate and cache operation
- Gets an InputStream from a URL
- Schedule a periodic task
- Gets the data from an input stream
- Timer timer
- Put a bitmap
- Clears the cache
- Destroys the subscription
- Java3 3
- Java 2 support
- Obtains a bitmap from a file
- Add a bitmap to a file
- Main thread
- Gets a bitmap
- Sets map operation
- From interface Observer
- Java 1 version
- Get data by input stream
- Merge all data
- Size of bitmap
RxJavaDemo Key Features
RxJavaDemo Examples and Code Snippets
Community Discussions
Trending Discussions on Reactive Programming
QUESTION
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 12:55So 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
QUESTION
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 18:10You need a state machine, but you can contain the state so you aren't leaving the monad... Something like this:
QUESTION
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 14:54You 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.
QUESTION
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 13:05I believe this is a simple use case of the throttle()
operator.
QUESTION
I need to copy date from one source (in parallel) to another with batches.
I did this:
...ANSWER
Answered 2021-Dec-04 at 19:50You need to do your heavy work in individual Publisher
-s which will be materialized in flatMap() in parallel. Like this
QUESTION
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 14:53The 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:
QUESTION
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 14:31I'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
QUESTION
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 16:21The expected way to do that is to actually use the fromIterable
method and provide your List
:
QUESTION
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 10:20I 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:
QUESTION
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 15:18The 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:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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Install RxJavaDemo
You can use RxJavaDemo 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 RxJavaDemo 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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