# Java API: Transforming, chaining ListenableActionFuture is tricky at best. How about extending Guava ListenableFuture to benefit from the featureset it provides?

**URL:** <https://discuss.elastic.co/t/java-api-transforming-chaining-listenableactionfuture-is-tricky-at-best-how-about-extending-guava-listenablefuture-to-benefit-from-the-featureset-it-provides/11609>\
**Category:** Elasticsearch\
**Created:** [April 17, 2013, 7:21am UTC](https://discuss.elastic.co/t/java-api-transforming-chaining-listenableactionfuture-is-tricky-at-best-how-about-extending-guava-listenablefuture-to-benefit-from-the-featureset-it-provides/11609 "2013-04-17T07:21:51Z")\
**Posts on this page:** 9\
**Page:** 1

<div class="post-metadata">

**Author:** ![Stephane\_Bastian](https://avatars.discourse-cdn.com/v4/letter/s/35a633/32.png) [@Stephane\_Bastian](https://discuss.elastic.co/u/Stephane_Bastian)\
**Post date:** [April 17, 2013, 7:21am UTC](https://discuss.elastic.co/t/java-api-transforming-chaining-listenableactionfuture-is-tricky-at-best-how-about-extending-guava-listenablefuture-to-benefit-from-the-featureset-it-provides/11609/1 "2013-04-17T07:21:51Z")

</div>

Hi,

I've been using ES for almost 2 years now and I'm very pleased with it. I  
am especially happy with the fact that everything is Asynchronous.

However, the one thing that sometimes gets in the way is when the code  
_calling_ ES has some logic to transform, chain or compose several  
ListenableActionFuture.

Outside ES, we are using google Guava to solve these tricky problems and  
make extensive use of Futures.transform (to transform a ListenableFuture in  
another ListenableFuture) or Futures.allAsList, etc.  
For people that have no clue of what I am talking about 🙂 -\>

> **[google/guava](https://github.com/google/guava)**
>
> guava - Google core libraries for Java

ListenableActionFuture returned by ES are great but there are no helper  
methods to transform, chain, group ListenableActionFutures.

So the question is:  
How about modifying ListenableActionFuture so that it extends  
ListenableFuture from Guava? This would allow for super simple integration  
with Guava concurrent package.

Another question for my own curiosity:  
Do you use google guava with ES?

Cheers!

Stephane

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**Author:** ![Ivan](https://avatars.discourse-cdn.com/v4/letter/i/df788c/32.png) [@Ivan](https://discuss.elastic.co/u/Ivan)\
**Post date:** [April 17, 2013, 5:42pm UTC](https://discuss.elastic.co/t/java-api-transforming-chaining-listenableactionfuture-is-tricky-at-best-how-about-extending-guava-listenablefuture-to-benefit-from-the-featureset-it-provides/11609/2 "2013-04-17T17:42:59Z")

</div>

After having used Scala, I love the power and flexibility of using Futures.  
I have not had a use case to do any transformations with Elasticsearch  
futures, but it would be interesting to see.

Elasticsearch uses Guava for the field caches. Not sure if there are any  
other uses.

--  
Ivan

On Wed, Apr 17, 2013 at 12:21 AM, Stephane Bastian \<  
[stephane.bastian.dev@gmail.com](mailto:stephane.bastian.dev@gmail.com)\> wrote:

> Hi,
> 
> I've been using ES for almost 2 years now and I'm very pleased with it. I  
> am especially happy with the fact that everything is Asynchronous.
> 
> However, the one thing that sometimes gets in the way is when the code  
> _calling_ ES has some logic to transform, chain or compose several  
> ListenableActionFuture.
> 
> Outside ES, we are using google Guava to solve these tricky problems and  
> make extensive use of Futures.transform (to transform a ListenableFuture in  
> another ListenableFuture) or Futures.allAsList, etc.  
> For people that have no clue of what I am talking about 🙂 -\>  
> [GitHub - google/guava: Google core libraries for Java](http://code.google.com/p/guava-libraries/wiki/ListenableFutureExplained)
> 
> ListenableActionFuture returned by ES are great but there are no helper  
> methods to transform, chain, group ListenableActionFutures.
> 
> So the question is:  
> How about modifying ListenableActionFuture so that it extends  
> ListenableFuture from Guava? This would allow for super simple integration  
> with Guava concurrent package.
> 
> Another question for my own curiosity:  
> Do you use google guava with ES?
> 
> Cheers!
> 
> Stephane
> 
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<div class="post-metadata">

**Author:** ![jprante](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jprante/32/44941_2.png) [@jprante](https://discuss.elastic.co/u/jprante)\
**Post date:** [April 17, 2013, 7:09pm UTC](https://discuss.elastic.co/t/java-api-transforming-chaining-listenableactionfuture-is-tricky-at-best-how-about-extending-guava-listenablefuture-to-benefit-from-the-featureset-it-provides/11609/3 "2013-04-17T19:09:56Z")

</div>

You might want to hack ES, the interface is  
org.elasticsearch.action.ActionFuture. It inherits from  
java.util.concurrent.Future, and since Guava's ListenableActionFuture  
also inherits from it, it should be possible to replace the JDK Future  
with the Guava Future.

Guava is used all over the place. com.google.common is shaded into  
org.elasticsearch.common which makes it a bit hard to trace the exact usage.

I use Guava with ES, only the collection helpers yet. Would love to  
explore the performance of Guava's EventBus for publishing event streams  
in a node, transported by websockets to other nodes, to subscribed clients.

Jörg

Am 17.04.13 09:21, schrieb Stephane Bastian:

> Hi,
> 
> I've been using ES for almost 2 years now and I'm very pleased with  
> it. I am especially happy with the fact that everything is Asynchronous.
> 
> However, the one thing that sometimes gets in the way is when the code  
> _calling_ ES has some logic to transform, chain or compose several  
> ListenableActionFuture.
> 
> Outside ES, we are using google Guava to solve these tricky problems  
> and make extensive use of Futures.transform (to transform a  
> ListenableFuture in another ListenableFuture) or Futures.allAsList, etc.  
> For people that have no clue of what I am talking about 🙂 -\>  
> [GitHub - google/guava: Google core libraries for Java](http://code.google.com/p/guava-libraries/wiki/ListenableFutureExplained)
> 
> ListenableActionFuture returned by ES are great but there are no  
> helper methods to transform, chain, group ListenableActionFutures.
> 
> So the question is:  
> How about modifying ListenableActionFuture so that it extends  
> ListenableFuture from Guava? This would allow for super simple  
> integration with Guava concurrent package.
> 
> Another question for my own curiosity:  
> Do you use google guava with ES?
> 
> Cheers!
> 
> Stephane

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**Author:** ![Stephane\_Bastian](https://avatars.discourse-cdn.com/v4/letter/s/35a633/32.png) [@Stephane\_Bastian](https://discuss.elastic.co/u/Stephane_Bastian)\
**Post date:** [April 17, 2013, 7:57pm UTC](https://discuss.elastic.co/t/java-api-transforming-chaining-listenableactionfuture-is-tricky-at-best-how-about-extending-guava-listenablefuture-to-benefit-from-the-featureset-it-provides/11609/4 "2013-04-17T19:57:23Z")

</div>

Hi Ivan,

We mainly have 2 uses cases to wrap ES ListenableActionFuture:

# Use case 1:

We have built a library that maps entities and their relationships to ES.  
It is very similar to JPA, the main difference is that the target is ES and  
not a relational db. Also all methods are async and return a guava  
ListenableFuture.

As an example, lets take the method that returns a single entity. Here is  
its signature:  
public ListenableFuture get(Class cls, String id);

Internally this method does the following:

1. Calls client.prepareGet(index, type, id).execute(); --\> this returns a  
ListenableActionFuture
2. Registers a listener on the listenableActionFuture so itś non blocking
3. When the listener is called we convert the json to the correct Java  
object(along with its relationships eagerly or lazily loaded if we asked  
for it, but that is a different story)

This code is working fine but it would be much easier if ES  
ListenableActionFuture could subclass guava ListenableFuture.  
In essence we would then simply use guava Futures.transform(xx, xx) that  
applies a function to the ListenableFuture to transform the json to a java  
object  
Less boilerplate code to write.

# Use case 2:

In some other part of our application, we call ElasticSearch (lets say a  
simple get by id), then we call another service containing extra data for  
the same id.  
Both calls are async. When we get _both_ result, we simply need to stuff  
the json of the second call into the json we got from ES. of course the  
result is itself a ListenableFuture.  
Once again here, it's quite a bit of code that's not easy to read, to make  
it work.

In both cases, it's fairly painful to transform/chain ES  
ListenableActionFuture.

Concerning guava, you are right, ES already uses it. It inlines some(all?)  
google guava code. Actually I believe that quite a bit of the concurrent  
code comes from guava. So subclassing guava ListenableFuture should not be  
a problem. But this will of course make the internal guava ListenableFuture  
part of the ES api..

To summarize, I believe that there is a need to make ES  
ListenableActionFuture easily chainable/transformable.  
It can be achieved by

1. subclassing guava ListenableFuture
2. converting ES ListenableActionFuture to guava ListenableFuture (although  
this one seems trickier because guava allows listeners to run different  
threads)

Stephane

On Wednesday, April 17, 2013 7:42:59 PM UTC+2, Ivan Brusic wrote:

```
After having used Scala, I love the power and flexibility of using 

```

Futures. I have not had a use case to do any transformations with  
ElasticSearch futures, but it would be interesting to see.  
ElasticSearch uses Guava for the field caches. Not sure if there are  
any other uses.  
--  
Ivan  
On Wed, Apr 17, 2013 at 12:21 AM, Stephane Bastian  
[stephane.b...@gmail.com](mailto:stephane.b...@gmail.com) wrote:

```
    Hi,

    I've been using ES for almost 2 years now and I'm very pleased with 

```

it. I am especially happy with the fact that everything is Asynchronous.

```
    However, the one thing that sometimes gets in the way is when the 

```

code _calling_ ES has some logic to transform, chain or compose several  
ListenableActionFuture.

```
    Outside ES, we are using google Guava to solve these tricky 

```

problems and make extensive use of Futures.transform (to transform a  
ListenableFuture in another ListenableFuture) or Futures.allAsList, etc.  
For people that have no clue of what I am talking about 🙂 -\>

> **[google/guava](https://github.com/google/guava)**
>
> guava - Google core libraries for Java

```
    ListenableActionFuture returned by ES are great but there are no 

```

helper methods to transform, chain, group ListenableActionFutures.

```
    So the question is:
    How about modifying ListenableActionFuture so that it extends 

```

ListenableFuture from Guava? This would allow for super simple integration  
with Guava concurrent package.

```
    Another question for my own curiosity:
    Do you use google guava with ES?

    Cheers!

    Stephane

    -- 
    You received this message because you are subscribed to the Google 

```

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**Author:** ![Stephane\_Bastian](https://avatars.discourse-cdn.com/v4/letter/s/35a633/32.png) [@Stephane\_Bastian](https://discuss.elastic.co/u/Stephane_Bastian)\
**Post date:** [April 17, 2013, 8:06pm UTC](https://discuss.elastic.co/t/java-api-transforming-chaining-listenableactionfuture-is-tricky-at-best-how-about-extending-guava-listenablefuture-to-benefit-from-the-featureset-it-provides/11609/5 "2013-04-17T20:06:34Z")

</div>

Hey Jorg,

You are right, guava provides a helper to convert a Future in a  
ListenableFuture. It's the class JdkFutureAdapters.listenInPoolThread()[http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/util/concurrent/JdkFutureAdapters.html#listenInPoolThread(java.util.concurrent.Future)](http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/util/concurrent/JdkFutureAdapters.html#listenInPoolThread%28java.util.concurrent.Future%29).

However I read that this method is far from ideal and not very scalable:  
Quote from [http://java.dzone.com/articles/listenablefuture-guava](http://java.dzone.com/articles/listenablefuture-guava)

If you are stuck with some legacy API that still returns Future you may try

> JdkFutureAdapters.listenInPoolThread()[http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/util/concurrent/JdkFutureAdapters.html#listenInPoolThread(java.util.concurrent.Future)](http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/util/concurrent/JdkFutureAdapters.html#listenInPoolThread%28java.util.concurrent.Future%29)which is an adapter converting plain  
> Future to ListenableFuture. But keep in mind that once you start  
> using addListener(), each such adapter will require one thread  
> exclusively to work so this solution doesn't scale at all and you should  
> avoid it.

Stephane

On Wednesday, April 17, 2013 9:09:56 PM UTC+2, Jörg Prante wrote:

> You might want to hack ES, the interface is  
> org.elasticsearch.action.ActionFuture. It inherits from  
> java.util.concurrent.Future, and since Guava's ListenableActionFuture  
> also inherits from it, it should be possible to replace the JDK Future  
> with the Guava Future.
> 
> Guava is used all over the place. com.google.common is shaded into  
> org.elasticsearch.common which makes it a bit hard to trace the exact  
> usage.
> 
> I use Guava with ES, only the collection helpers yet. Would love to  
> explore the performance of Guava's EventBus for publishing event streams  
> in a node, transported by websockets to other nodes, to subscribed  
> clients.
> 
> Jörg
> 
> Am 17.04.13 09:21, schrieb Stephane Bastian:
> 
> > Hi,
> > 
> > I've been using ES for almost 2 years now and I'm very pleased with  
> > it. I am especially happy with the fact that everything is Asynchronous.
> > 
> > However, the one thing that sometimes gets in the way is when the code  
> > _calling_ ES has some logic to transform, chain or compose several  
> > ListenableActionFuture.
> > 
> > Outside ES, we are using google Guava to solve these tricky problems  
> > and make extensive use of Futures.transform (to transform a  
> > ListenableFuture in another ListenableFuture) or Futures.allAsList, etc.  
> > For people that have no clue of what I am talking about 🙂 -\>  
> > [GitHub - google/guava: Google core libraries for Java](http://code.google.com/p/guava-libraries/wiki/ListenableFutureExplained)
> > 
> > ListenableActionFuture returned by ES are great but there are no  
> > helper methods to transform, chain, group ListenableActionFutures.
> > 
> > So the question is:  
> > How about modifying ListenableActionFuture so that it extends  
> > ListenableFuture from Guava? This would allow for super simple  
> > integration with Guava concurrent package.
> > 
> > Another question for my own curiosity:  
> > Do you use google guava with ES?
> > 
> > Cheers!
> > 
> > Stephane

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**Author:** ![Stephane\_Bastian](https://avatars.discourse-cdn.com/v4/letter/s/35a633/32.png) [@Stephane\_Bastian](https://discuss.elastic.co/u/Stephane_Bastian)\
**Post date:** [April 19, 2013, 3:14pm UTC](https://discuss.elastic.co/t/java-api-transforming-chaining-listenableactionfuture-is-tricky-at-best-how-about-extending-guava-listenablefuture-to-benefit-from-the-featureset-it-provides/11609/6 "2013-04-19T15:14:49Z")

</div>

Hey,

I found a simple solution to the problem I described above. In case someone  
comes across the same issue here it is the solution which is simply to  
convert an ES ListenableActionFuture to a guava ListenableFuture.  
Here is the code:

```
public final static <T> ListenableFuture<T> 

```

> esListenableToGuavaListenable(ListenableActionFuture  
> listenableActionFuture) {  
> final SettableFuture result = SettableFuture.create();  
> listenableActionFuture.addListener(new ActionListener() {  
> @Override  
> public void onResponse(T response) {  
> result.set(response);  
> }
> 
> ```
> @Override
> public void onFailure(Throwable e) {
> result.setException(e);
> }
> });
> return result;
> }
> 
> ```

I then simply call this method each time ES returns a  
ListenableActionFuture, basically each time you call .execute() on a builder

Hope this helps,

Stephane

Le mercredi 17 avril 2013 22:06:34 UTC+2, Stephane Bastian a écrit :

> Hey Jorg,
> 
> You are right, guava provides a helper to convert a Future in a  
> ListenableFuture. It's the class JdkFutureAdapters.listenInPoolThread()[http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/util/concurrent/JdkFutureAdapters.html#listenInPoolThread(java.util.concurrent.Future)](http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/util/concurrent/JdkFutureAdapters.html#listenInPoolThread%28java.util.concurrent.Future%29).
> 
> However I read that this method is far from ideal and not very scalable:  
> Quote from [http://java.dzone.com/articles/listenablefuture-guava](http://java.dzone.com/articles/listenablefuture-guava)
> 
> If you are stuck with some legacy API that still returns Future you may
> 
> > try JdkFutureAdapters.listenInPoolThread()[http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/util/concurrent/JdkFutureAdapters.html#listenInPoolThread(java.util.concurrent.Future)](http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/util/concurrent/JdkFutureAdapters.html#listenInPoolThread%28java.util.concurrent.Future%29)which is an adapter converting plain  
> > Future to ListenableFuture. But keep in mind that once you start  
> > using addListener(), each such adapter will require one thread  
> > exclusively to work so this solution doesn't scale at all and you should  
> > avoid it.
> 
> Stephane
> 
> On Wednesday, April 17, 2013 9:09:56 PM UTC+2, Jörg Prante wrote:
> 
> > You might want to hack ES, the interface is  
> > org.elasticsearch.action.ActionFuture. It inherits from  
> > java.util.concurrent.Future, and since Guava's ListenableActionFuture  
> > also inherits from it, it should be possible to replace the JDK Future  
> > with the Guava Future.
> > 
> > Guava is used all over the place. com.google.common is shaded into  
> > org.elasticsearch.common which makes it a bit hard to trace the exact  
> > usage.
> > 
> > I use Guava with ES, only the collection helpers yet. Would love to  
> > explore the performance of Guava's EventBus for publishing event streams  
> > in a node, transported by websockets to other nodes, to subscribed  
> > clients.
> > 
> > Jörg
> > 
> > Am 17.04.13 09:21, schrieb Stephane Bastian:
> > 
> > > Hi,
> > > 
> > > I've been using ES for almost 2 years now and I'm very pleased with  
> > > it. I am especially happy with the fact that everything is  
> > > Asynchronous.
> > > 
> > > However, the one thing that sometimes gets in the way is when the code  
> > > _calling_ ES has some logic to transform, chain or compose several  
> > > ListenableActionFuture.
> > > 
> > > Outside ES, we are using google Guava to solve these tricky problems  
> > > and make extensive use of Futures.transform (to transform a  
> > > ListenableFuture in another ListenableFuture) or Futures.allAsList,  
> > > etc.  
> > > For people that have no clue of what I am talking about 🙂 -\>  
> > > [GitHub - google/guava: Google core libraries for Java](http://code.google.com/p/guava-libraries/wiki/ListenableFutureExplained)
> > > 
> > > ListenableActionFuture returned by ES are great but there are no  
> > > helper methods to transform, chain, group ListenableActionFutures.
> > > 
> > > So the question is:  
> > > How about modifying ListenableActionFuture so that it extends  
> > > ListenableFuture from Guava? This would allow for super simple  
> > > integration with Guava concurrent package.
> > > 
> > > Another question for my own curiosity:  
> > > Do you use google guava with ES?
> > > 
> > > Cheers!
> > > 
> > > Stephane

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<div class="post-metadata">

**Author:** ![Bruce\_Ritchie](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/bruce_ritchie/32/9370_2.png) [@Bruce\_Ritchie](https://discuss.elastic.co/u/Bruce_Ritchie)\
**Post date:** [April 22, 2013, 1:10pm UTC](https://discuss.elastic.co/t/java-api-transforming-chaining-listenableactionfuture-is-tricky-at-best-how-about-extending-guava-listenablefuture-to-benefit-from-the-featureset-it-provides/11609/7 "2013-04-22T13:10:03Z")

</div>

The source tells all, all it takes is for you to take a quick look.

The pom.xml in github:

```
    <dependency>
        <groupId>com.google.guava</groupId>
        <artifactId>guava</artifactId>
        <version>14.0.1</version>
        <scope>compile</scope>
        <exclusions>
            <exclusion>
                <groupId>com.google.code.findbugs</groupId>
                <artifactId>jsr305</artifactId>
            </exclusion>
        </exclusions>
    </dependency>

```

On Wednesday, April 17, 2013 3:21:51 AM UTC-4, Stephane Bastian wrote:

> Another question for my own curiosity:  
> Do you use google guava with ES?

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<div class="post-metadata">

**Author:** ![Stephane\_Bastian](https://avatars.discourse-cdn.com/v4/letter/s/35a633/32.png) [@Stephane\_Bastian](https://discuss.elastic.co/u/Stephane_Bastian)\
**Post date:** [April 22, 2013, 2:25pm UTC](https://discuss.elastic.co/t/java-api-transforming-chaining-listenableactionfuture-is-tricky-at-best-how-about-extending-guava-listenablefuture-to-benefit-from-the-featureset-it-provides/11609/8 "2013-04-22T14:25:23Z")

</div>

Hi Bruce,

I'm looking at the question I asked and it was fairly confusing. The fact  
that ES uses guava internally wasn't the question. Sorry about that.

The question should have been:  
Do you use google guava _ListenableFuture_ with ES? If yes, how?

Le lundi 22 avril 2013 15:10:03 UTC+2, Bruce Ritchie a écrit :

> The source tells all, all it takes is for you to take a quick look.
> 
> The pom.xml in github:
> 
> ```
> <dependency>
> <groupId>com.google.guava</groupId>
> <artifactId>guava</artifactId>
> <version>14.0.1</version>
> <scope>compile</scope>
> <exclusions>
> <exclusion>
> <groupId>com.google.code.findbugs</groupId>
> <artifactId>jsr305</artifactId>
> </exclusion>
> </exclusions>
> </dependency>
> 
> ```
> 
> On Wednesday, April 17, 2013 3:21:51 AM UTC-4, Stephane Bastian wrote:
> 
> > Another question for my own curiosity:  
> > Do you use google guava with ES?

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---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 6, 2017, 2:40am UTC](https://discuss.elastic.co/t/java-api-transforming-chaining-listenableactionfuture-is-tricky-at-best-how-about-extending-guava-listenablefuture-to-benefit-from-the-featureset-it-provides/11609/9 "2017-07-06T02:40:10Z")

</div>