reactor | Phoenix LiveView but for Django | Websocket library
kandi X-RAY | reactor Summary
kandi X-RAY | reactor Summary
Reactor enables you to do something similar to Phoenix framework LiveView using Django Channels.
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Top functions reviewed by kandi - BETA
- Render a component
- Create a new Component
- Register a component
- Parse request data
- Recursively parse an object
- Dispatch an event
- Filters out kwargs
- Debounce a function
- Add a curly braces to the given code
- Render the template
- Create a new Channel
- Render an event
- Transpiles an event
- Recursively parse data into a dictionary
- Return key for delete
- Wrapper for _escape_escape
- Returns the backspace key for the given code
- Return the entry key
- Return the key for a given code
- Return the key for a tab
- Ctrl + Alt key
- Return the left key for the given code
- Get the right arrow right key
- Ctrl key
- Return meta key
- Shift key
- Generate key code for key code
reactor Key Features
reactor Examples and Code Snippets
Lines of Code : 10License : Non-SPDX
Copypublic void start() {
reactorMain.execute(() -> {
try {
LOGGER.info("Reactor started, waiting for events...");
eventLoop();
} catch (IOException e) {
LOGGER.error("exception in event loop", e);
}
} public void stop() throws InterruptedException, IOException {
reactorMain.shutdown();
selector.wakeup();
if (!reactorMain.awaitTermination(4, TimeUnit.SECONDS)) {
reactorMain.shutdownNow();
}
selector.close();
LOGGER.inf void setReactor(NioReactor reactor) {
this.reactor = reactor;
} Community Discussions
Trending Discussions on reactor
QUESTION
I try to access the flux object in Spring Integration without splitting the flow declaration to two functions. I wonder how can I perform the following:
...ANSWER
Answered 2022-Feb-28 at 17:18The IntegrationFlows.from(somePublisher) start a ractive stream for the provided Publisher. The rest of the flow is done against every single event in the source Publisher. So, your .handle(flux ->) is going to work only if that event from the source is a Flux.
If your idea to apply that buffer() for the source Publisher and go on, then consider to use a reactive() customizer: https://docs.spring.io/spring-integration/docs/current/reference/html/reactive-streams.html#fluxmessagechannel-and-reactivestreamsconsumer.
So, instead of that handle() I would use:
QUESTION
I'm trying to initiate a Springboot project using Open Jdk 15, Springboot 2.6.0, Springfox 3. We are working on a project that replaced Netty as the webserver and used Jetty instead because we do not need a non-blocking environment.
In the code we depend primarily on Reactor API (Flux, Mono), so we can not remove org.springframework.boot:spring-boot-starter-webflux dependencies.
I replicated the problem that we have in a new project.: https://github.com/jvacaq/spring-fox.
I figured out that these lines in our build.gradle file are the origin of the problem.
...ANSWER
Answered 2022-Feb-08 at 12:36This problem's caused by a bug in Springfox. It's making an assumption about how Spring MVC is set up that doesn't always hold true. Specifically, it's assuming that MVC's path matching will use the Ant-based path matcher and not the PathPattern-based matcher. PathPattern-based matching has been an option for some time now and is the default as of Spring Boot 2.6.
As described in Spring Boot 2.6's release notes, you can restore the configuration that Springfox assumes will be used by setting spring.mvc.pathmatch.matching-strategy to ant-path-matcher in your application.properties file. Note that this will only work if you are not using Spring Boot's Actuator. The Actuator always uses PathPattern-based parsing, irrespective of the configured matching-strategy. A change to Springfox will be required if you want to use it with the Actuator in Spring Boot 2.6 and later.
QUESTION
I have written a logic using spring reactor library to get all operators and then all devices for each operator (paginated) in async mode.
Created a flux to get all operator and then subscribing to it.
...ANSWER
Answered 2022-Mar-16 at 11:34I broke it down to two flows 1st getting all operators and then getting all devices for each operator.
For pagination I'm using Flux.expand to extract all pages.
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
How to manage access to shared resources using Project Reactor?
Given an imaginary critical component that can execute only operation at the time (file store, expensive remote service, etc), how could one orchestrate in reactive manner access to this component if there are multiple points of access to this component (multiple API methods, subscribers...)? If the resource is free to execute the operation it should execute it right away, if some other operation is already in progress, add my operation to the queue and complete my Mono once my operation is completed.
My idea is to add tasks to the flux queue which executes tasks one by one and return a Mono which will be complete once the task in the queue is completed, without blocking.
...ANSWER
Answered 2022-Feb-23 at 10:26this looks like a simplified version of what the reactor-pool does, in essence. have you considered using that with eg. a maximum size of 1?
https://github.com/reactor/reactor-pool/
https://projectreactor.io/docs/pool/0.2.7/api/reactor/pool/Pool.html
The pool is probably overkill, because it has the overhead of having to deal with multiple resources on top of multiple competing borrowers like in your case, but maybe it could provide some inspiration for you to go further.
QUESTION
I am running a Spring Boot app that uses WebClient for both non-blocking and blocking HTTP requests. After the app has run for some time, all outgoing HTTP requests seem to get stuck.
WebClient is used to send requests to multiple hosts, but as an example, here is how it is initialized and used to send requests to Telegram:
WebClientConfig:
...ANSWER
Answered 2021-Dec-20 at 14:25I would propose to take a look in the RateLimiter direction. Maybe it does not work as expected, depending on the number of requests your application does over time. From the Javadoc for Ratelimiter: "It is important to note that the number of permits requested never affects the throttling of the request itself ... but it affects the throttling of the next request. I.e., if an expensive task arrives at an idle RateLimiter, it will be granted immediately, but it is the next request that will experience extra throttling, thus paying for the cost of the expensive task." Also helpful might be this discussion: github or github
I could imaginge there is some throttling adding up or other effect in the RateLimiter, i would try to play around with it and make sure this thing really works the way you want. Alternatively, consider using Spring @Scheduled to read from your queue. You might want to spice it up using embedded JMS for further goodies (message persistence etc).
QUESTION
I'm upgrading from JDK 8 to JDK 17 and I'm trying to compile with mvn clean install -X -DskipTests and there's no information about the error.
Btw, I'm updating the dependencies and after that I compile to see if has errors. I need to update some dependencies such as Spring, Hibernate etc. I already updated Lombok.
I added the -X or -e option but I got the same result.
What can I do to get more information about the error? The log shows that it was loading hibernate-jpa-2.1-api before failed... so that means the problem is in this dependency?
...ANSWER
Answered 2021-Oct-19 at 20:28This failure is likely due to an issue between java 17 and older lombok versions. Building with java 17.0.1, lombok 1.18.20 and maven 3.8.1 caused a vague "Compilation failure" for me as well. I upgraded to maven 3.8.3 which also failed but provided this detail on the failure:
java.lang.NullPointerException: Cannot read field "bindingsWhenTrue" because "currentBindings" is null
Searching for this failure message I found this issue on stackoverflow leading me to a bug in lombok. I upgraded to lombok 1.18.22 and that fixed the compilation failure for a successful build.
QUESTION
I'd like to understand how to create a reactive channel adapter for Spring Integration with Reactor core. I've understood from other forums I've read that this Mongo DB reactive adapter can be a good example, but it contains lots of Mongo domain specific classes.
I've read the Reactive part of the docs, and I see that there is a need to implement MessageProducerSupport, but from the code example it looks that there is a need of implementing a class the extends MessageProducerSpec and calls the first one. Can someone give an example for the most basic usage and explain what is really a demand for creating such a channel adapter? What I understand that I should do is something like:
ANSWER
Answered 2022-Feb-01 at 15:09The MessageProducerSpec is for Java DSL. It has nothing to do with low-level logic of the channel adapter. If you have a MessageProducerSupport, then this one is good enough for you to use in the flow definition:
QUESTION
Let's say we have a function
...ANSWER
Answered 2022-Jan-22 at 18:36A function already exists for this conversion. You need this dependency...
QUESTION
I’m using Project Reactor for a non-blocking IO data pipeline, and I’m thinking of using Spring Integration as an abstraction layer to manage all of the flows and components in my pipeline. I’m currently implementing a Kafka consumer with Project Reactor and I’m starting to wonder whether the Spring Integration wrap can damage my pipeline in terms of blocking and back-pressure.
I would like to know if is considered safe to use Spring Integration and its classes in a full non blocking application, and if there’s any traps I should note.
...ANSWER
Answered 2022-Jan-18 at 18:02In most cases Spring Integration components are stateless, so they are safe to use in multi-threaded (or non-blocking) environment. You may suffer some concerns if you use a specific channel adapter which really does a blocking IO operation, e.g. file writing or JDBC INSERT. In this cases you would need to consider to switch to a different thread for this type of operations to not block your reactive flow.
See respective recipe in Project Reactor: https://projectreactor.io/docs/core/release/reference/#faq.wrap-blocking
For that thread switching purpose Spring Integration provides an ExecutorChannel and QueueChannel implementations. However the FluxMessageChannel will fit in some cases pretty well.
The limited back-pressure does not make sense in Spring Integration solution since everything is considered as a stream, infinite flow of data. Therefore in most cases Spring Integration relies on the natural back-pressure where we don't request more until we process the current.
Please, give it a try and don't hesitate coming back to us with some feedback!
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