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Explaning is Future Working In Play controller

Clarification needed about futures and promises in ScalaAre Play framework controller actions synchronized?Wait for any of given Futures in Scala?Scala 2 futures containing api calls race conditionPlay 2.2 java - can one controller call another?Are there any benefits in using non-async actions in Play Framework 2.2?Convert Play Framework java Promise to Play Framework Scala PromiseUsing Future inside a View in play 2.3.2Call 2 Futures in the same Action.async Scala Playscala: mapping future of tupleBest practices to use Future inside a Controller (Play+Scala)

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0

I am needing explaining on how future is working in my play controller.

I have some code in my service layer which is calling a Java library API. When I first call my Java API like this in a controller:

def someController() = Action 
 someJavaAPI()
 Ok("done")

For this controller, I did not see any action. I expect action because of a call to someJavaAPI. Then somebody told me that someJavaAPI is dying because the controller is finishing too early. Is that right?

So I changed the code to be like this: I am wrapping someJavaAPI() method in a Future

def someJavaAPI() = Future ....code....

Now I calling this like this in my contraoller:

def someController() = Action 
 someJavaAPI().map _ => Ok("done") 

This is working very good.

My question is: is wrapping someJavaAPI in future makes controller thread wait until it finished and then does map function?

Also, what is Promise? Can I use Promise here? I am not sure.

scala playframework

share|improve this question

edited Mar 26 at 16:42

Krzysztof Atłasik

10.5k22 gold badges2121 silver badges4646 bronze badges

asked Mar 26 at 16:11

MojoMojo

13688 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Please refer docs.scala-lang.org/overviews/core/futures.html and stackoverflow.com/questions/18960339/…. It will answer most of your questions
  
  – Chaitanya Waikar
  Mar 26 at 16:15
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  How exactly did you call java API in both cases?
  
  – Andriy Kuba
  Mar 26 at 21:09
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @AndriyKuba I am not sure what you are meaning. Java library method is called like I show,
  
  – Mojo
  Mar 27 at 9:09
  

  
  
  
  

add a comment | 

0

I am needing explaining on how future is working in my play controller.

I have some code in my service layer which is calling a Java library API. When I first call my Java API like this in a controller:

def someController() = Action 
 someJavaAPI()
 Ok("done")

For this controller, I did not see any action. I expect action because of a call to someJavaAPI. Then somebody told me that someJavaAPI is dying because the controller is finishing too early. Is that right?

So I changed the code to be like this: I am wrapping someJavaAPI() method in a Future

def someJavaAPI() = Future ....code....

Now I calling this like this in my contraoller:

def someController() = Action 
 someJavaAPI().map _ => Ok("done") 

This is working very good.

My question is: is wrapping someJavaAPI in future makes controller thread wait until it finished and then does map function?

Also, what is Promise? Can I use Promise here? I am not sure.

scala playframework

share|improve this question

edited Mar 26 at 16:42

Krzysztof Atłasik

10.5k22 gold badges2121 silver badges4646 bronze badges

asked Mar 26 at 16:11

MojoMojo

13688 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Please refer docs.scala-lang.org/overviews/core/futures.html and stackoverflow.com/questions/18960339/…. It will answer most of your questions
  
  – Chaitanya Waikar
  Mar 26 at 16:15
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  How exactly did you call java API in both cases?
  
  – Andriy Kuba
  Mar 26 at 21:09
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @AndriyKuba I am not sure what you are meaning. Java library method is called like I show,
  
  – Mojo
  Mar 27 at 9:09
  

  
  
  
  

add a comment | 

I am needing explaining on how future is working in my play controller.

I have some code in my service layer which is calling a Java library API. When I first call my Java API like this in a controller:

def someController() = Action 
 someJavaAPI()
 Ok("done")

For this controller, I did not see any action. I expect action because of a call to someJavaAPI. Then somebody told me that someJavaAPI is dying because the controller is finishing too early. Is that right?

So I changed the code to be like this: I am wrapping someJavaAPI() method in a Future

def someJavaAPI() = Future ....code....

Now I calling this like this in my contraoller:

def someController() = Action 
 someJavaAPI().map _ => Ok("done") 

This is working very good.

My question is: is wrapping someJavaAPI in future makes controller thread wait until it finished and then does map function?

Also, what is Promise? Can I use Promise here? I am not sure.

scala playframework

share|improve this question

edited Mar 26 at 16:42

Krzysztof Atłasik

10.5k22 gold badges2121 silver badges4646 bronze badges

asked Mar 26 at 16:11

MojoMojo

13688 bronze badges

def someController() = Action 
 someJavaAPI()
 Ok("done")

def someJavaAPI() = Future ....code....

def someController() = Action 
 someJavaAPI().map _ => Ok("done") 

share|improve this question

edited Mar 26 at 16:42

Krzysztof Atłasik

10.5k22 gold badges2121 silver badges4646 bronze badges

asked Mar 26 at 16:11

MojoMojo

13688 bronze badges

share|improve this question

edited Mar 26 at 16:42

Krzysztof Atłasik

10.5k22 gold badges2121 silver badges4646 bronze badges

asked Mar 26 at 16:11

MojoMojo

13688 bronze badges

edited Mar 26 at 16:42

Krzysztof Atłasik

10.5k22 gold badges2121 silver badges4646 bronze badges

edited Mar 26 at 16:42

Krzysztof Atłasik

10.5k22 gold badges2121 silver badges4646 bronze badges

asked Mar 26 at 16:11

MojoMojo

13688 bronze badges

asked Mar 26 at 16:11

MojoMojo

13688 bronze badges