Programming language: Java
License: MIT License
Tags: Projects     HTTP Clients    

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restQL-core allows you to run restQL queries directly from JVM applications, making easy to fetch information from multiple services in the most efficient manner. e.g.:

from search
        role = "hero"

from hero as heroList
        name = search.results.name

You can learn more about restQL query language here and here

restQL-core is built upon the battle proven HttpKit and Clojure core.async to maximize performance and throughtput.

If you're using Clojure you may want to check restQL-core or restQL-Server if you're using another languagem or working in a client application.

Getting Started


Add Clojars repository and restQL dependency to your project




repositories {
    maven { 
        url "http://clojars.org/repo"
compile 'com.b2wdigital:restql-core-java:3.5.5'

First query

ClassConfigRepository config = new ClassConfigRepository();
config.put("planets", "https://swapi.co/api/planets/:id");

RestQL restQL = new RestQL(config);
QueryResponse response = restQL.executeQuery("from planets with id = ?", 1);

System.out.println("The response JSON is: " + response.toString());

In the example above restQL will call StarWars planet API passing "1" as param.


restQL receives a configuration class with the API mappings. You can use the available configuration repositories -- SystemPropertiesConfigRepository, PropertiesFileConfigRepository or ClassConfigRepository -- or implement your own, using the ConfigRepository interface.

You can check more about endpoints configuration here


Simple Query

Retrieving all magic cards

ClassConfigRepository config = new ClassConfigRepository();
config.put("cards", "http://api.magicthegathering.io/v1/cards");

RestQL restQL = new RestQL(config);

String query = "from cards as cardslist params type = ?";

QueryResponse response = restQL.executeQuery(query, "Artifact");

// The JSON String
String jsonString = response.toString();

// The mapped object
List<MTGCard> cards = result.getList("cardslist", MTGCard.class);

Chained Query

Listing all cards and then fetching its details.

ClassConfigRepository config = new ClassConfigRepository();
config.put("cards", "http://api.magicthegathering.io/v1/cards");
config.put("card", "http://api.magicthegathering.io/v1/cards/:id");

RestQL restQL = new RestQL(config);

String queryCardsAndDetails = "from cards as cardsList params type = ? \n"
                            + "from card as cardWithDetails params id = cardsList.id";

QueryResponse response = restQL.executeQuery(queryCardsAndDetails, "Artifact");

// The JSON String
String jsonString = response.toString();

// The mapped object
List<MTGCard> cards = result.getList("cardWithDetails", MTGCard.class);

Building From Source Code

As prerequisites to build restQL from source we have:

  • Java 11
  • Maven 3

Just clone this repo and run "mvn compile".


Copyright © 2016 B2W Digital

Distributed under the MIT License.

*Note that all licence references and agreements mentioned in the restQL-core-java README section above are relevant to that project's source code only.