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How to unwrap StreamEx to a "Plain Old Java Stream"?


How to unwrap StreamEx to a "Plain Old Java Stream"?

By : Sunsinron
Date : November 21 2020, 09:01 AM
Any of those help There's no public API method to "unwrap" the StreamEx stream. This is done on purpose. In general the StreamEx class is compatible with original Stream API, so if you need to pass StreamEx to some code accepting simple Stream, you can do this without any fear.
The overhead of using StreamEx is usually very low: only one or several additional call per stream step (some of which could be eliminated by JIT compiler). This overhead (if not eliminated by JIT) appears only during the stream creation, not during evaluation, thus it does not depend on number of elements in the stream. When the terminal operation occurs, the processing is handed over to the original stream, thus in your example during map and forEach evaluation no StreamEx library code will be running.
code :


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In Swift if you unwrap a "Implicitly Unwrapped Optional" is this a double unwrap?

In Swift if you unwrap a "Implicitly Unwrapped Optional" is this a double unwrap?


By : Rosalie Mae Aguirre
Date : March 29 2020, 07:55 AM
may help you . The two key sentences in the book are:
"Unwrap" Optional of Optional.empty before return in a Java stream (or Parallel Stream)

"Unwrap" Optional of Optional.empty before return in a Java stream (or Parallel Stream)


By : Whiker Fan
Date : March 29 2020, 07:55 AM
this one helps. You could use Optional#flatMap to 'unwrap' the inner optional:
code :
public boolean hasFirst() {
   return types.parallelStream()
       .filter(it -> it.getTotalAmount() > 0)
       .map(TypeA::getFirst)
       .findFirst() // return Optional[Optional.empty]
       .flatMap(i -> i) // <---
       .isPresent(); // true
}
The spring-stream sends a message with "text/plain" content-type instead of "application/json"

The spring-stream sends a message with "text/plain" content-type instead of "application/json"


By : Bsaam Sameh
Date : March 29 2020, 07:55 AM
will be helpful for those in need It appears you are using 1.3 version of S-C-Stream. Could you please confirm? We can certainly take a look. Also, FWIW, the whole 'originalContentType' issue is not a problem as long as you have a consumer that is SCSt application (as it's going to be reset to what you expect), but I am assuming that it is not, correct?
Also, any chance you can upgrade to 2.0.0.M3. There has been a lot of improvements around contentType resolution.
Unable to connect to Command Metric Stream in Spring Cloud + Hystrix + Turbine - MIME type ("text/plain") that

Unable to connect to Command Metric Stream in Spring Cloud + Hystrix + Turbine - MIME type ("text/plain") that


By : Treblig Anapil Orite
Date : March 29 2020, 07:55 AM
I wish did fix the issue. @Sayali I tried recreating the error in my own system and I managed to get it working, here are a few checks you can make:
1) The URL in your 1st screenshot is incorrect. Your stream URL in the Hystrix Dashboard should be:
code :
management.endpoints.web.exposure.include= hystrix.stream, info, health
@EnableTurbine // instead of @EnableTurbineStream
@SpringBootApplication
public class HystrixTurbineApplication {

    public static void main(String[] args) {
        SpringApplication.run(HystrixTurbineApplication.class, args);
    }
}
While calling wget from java with consuming the "error" and "output" stream, the sub process tries t

While calling wget from java with consuming the "error" and "output" stream, the sub process tries t


By : Mohamed Ahmed Borhan
Date : March 29 2020, 07:55 AM
Any of those help
The problem is that the subprocess tries to run the incomplete wgetCommand many times and finally it calls the complete command and everything is fine. ... Is there any body who has any idea on this?
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