App Configuration server SDK for Java

Get single feature

Feature feature = appConfigClient.getFeature("online-check-in");

if (feature != null) {
    System.out.println("Feature Name : " + feature.getFeatureName());
    System.out.println("Feature Id : " + feature.getFeatureId());
    System.out.println("Feature Type : " + feature.getFeatureDataType());
    System.out.println("Is feature enabled? : " + feature.isEnabled());
}

Get all features

HashMap<String, Feature> features = appConfigClient.getFeatures();

Feature evaluation

You can use the feature.getCurrentValue(entityId, entityAttributes) method to evaluate the value of the feature flag. You must pass a unique entityId as the parameter for the feature flag evaluation. If the feature flag is configured with segments in the App Configuration service, you can set the attributes values as a JSONObject.

String entityId = "john_doe";
JSONObject entityAttributes = new JSONObject();
entityAttributes.put("city", "Bangalore");
entityAttributes.put("country", "India");

String value = (String) feature.getCurrentValue(entityId, entityAttributes);

• entityId: Id of the entity. This is a string identifier related to the entity against which the feature is evaluated. For example, an entity might be an instance of an app that runs on a mobile device, a microservice that runs on the cloud, or a component of infrastructure that runs that microservice. For any entity to interact with App Configuration, it must provide a unique entity ID.

• entityAttributes: A JSON object consisting of the attribute name and their values that define the specified entity. This is an optional parameter if the feature flag is not configured with any targeting definition. If the targeting is configured, then entityAttributes should be provided for the rule evaluation. An attribute is a parameter that is used to define a segment. The SDK uses the attribute values to determine whether the specified entity satisfies the targeting rules, and returns the appropriate feature flag value.

Get single property

Property property = appConfigClient.getProperty("check-in-charges");

if (property != null) {
    System.out.println("Property Name : " + property.getPropertyName());
    System.out.println("Property Id : " + property.getPropertyId());
    System.out.println("Property Type : " + property.getPropertyDataType());
}

Get all properties

HashMap<String, Property> property = appConfigClient.getProperties();

Property evaluation

You can use the property.getCurrentValue(entityId, entityAttributes) method to evaluate the value of the property. This method returns the default property value or its overridden value based on the evaluation.

String entityId = "john_doe";
JSONObject entityAttributes = new JSONObject();
entityAttributes.put("city", "Bangalore");
entityAttributes.put("country", "India");

String value = (String) property.getCurrentValue(entityId, entityAttributes);

• entityId: Id of the entity. This is a string identifier related to the entity against which the property is evaluated. For example, an entity might be an instance of an app that runs on a mobile device, a microservice that runs on the cloud, or a component of infrastructure that runs that microservice. For any entity to interact with App Configuration, it must provide a unique entity ID.

• entityAttributes: A JSON object consisting of the attribute name and their values that define the specified entity. This is an optional parameter if the property is not configured with any targeting definition. If the targeting is configured, then entityAttributes should be provided for the rule evaluation. An attribute is a parameter that is used to define a segment. The SDK uses the attribute values to determine whether the specified entity satisfies the targeting rules, and returns the appropriate property value.

Property

Property property = appConfigClient.getProperty("json-property");
if (property != null) {
   property.getPropertyDataType();     // STRING
   property.getPropertyDataFormat();   // JSON
   property.getCurrentValue(entityId, entityAttributes); // JSONObject or JSONArray is returned
}

// Example Below
// input json :- [{"role": "developer", "description": "do coding"},{"role": "tester", "description": "do testing"}]
// expected output :- "do coding"

JSONArray tar_val = (JSONArray) property.get_current_value(entityId, entityAttributes);
String expected_output = (String) ((JSONObject) tar_val.get(0)).get('description');

// input json :- {"role": "tester", "description": "do testing"}
// expected output :- "tester"

JSONObject tar_val = (JSONObject) property.get_current_value(entityId, entityAttributes);
String expected_output = (String) tar_val.get('role');

Property property = appConfigClient.getProperty("yaml-property");
if (property != null) {
   property.getPropertyDataType();     // STRING
   property.getPropertyDataFormat();   // YAML
   property.getCurrentValue(entityId, entityAttributes); // Yaml String is returned
}

Set listener for feature or property changes

The SDK provides mechanism to notify you in real time when feature flag's or property's configuration changes. You can subscribe to configuration changes by using the same appConfigClient.

appConfigClient.registerConfigurationUpdateListener(new ConfigurationUpdateListener() {
   @Override
   public void onConfigurationUpdate() {
      System.out.println("Received updated configurations");
      // **add your code**
      // To find the effect of any configuration changes, you can call the feature or property related methods

      // Feature feature = appConfigClient.getFeature("numeric-feature");
      // Integer newValue = (Integer) feature.getCurrentValue(entityId, entityAttributes);
   }
});

Fetch most recent data

appConfigClient.fetchConfigurations();