User Identifier & Properties

Identifier

For the meaning and importance of User Identifiers and guidelines for choosing one, refer to the Managing User Identifiers document.

The User Identifier is used to uniquely identify a user. You can manage User Identifiers through the Hackle SDK.

Category	Description
Client	The client manages User Identifiers internally. The client uses two main types of identifiers. - The Device ID provided by the Hackle SDK - Custom identifiers
Server	The server does not manage User Identifiers internally. A User Identifier must always be passed for every server request.

Property

The Hackle SDK supports adding properties to the User object. By sending user-specific information as User Properties, you can reduce repetitive coding while making rich use of them in A/B Tests and data analytics.

• Properties must be sent as key-value pairs (Property Key and Property Value).

• A maximum of 128 properties can be added.

Category	Type	Constraints
Property Key	string	Character limit is 128 characters. Case-insensitive. For example, AGE and age are recognized as the same Property Key.
Property Value	boolean, string, number, array	For string type, the character limit is 1024 characters. String type is case-sensitive. For example, APPLE and apple are recognized as different Property Values. For number type, up to 15 integer digits and up to 6 decimal places are supported.

Example

The User object is used as a parameter in variation distribution, Feature Flag decisions, and event tracking. The example below shows three properties (age, grade, is_paying_user) being added.

import io.hackle.android.HackleApp
import io.hackle.sdk.common.User
import io.hackle.sdk.common.Variation

User user = User.builder()
  	.userId(userId)
    .property("age", 30)
    .property("grade", "GOLD")
    .property("is_paying_user", false)
    .build();

// Variation distribution
Variation variation = hackleApp.variation(experimentKey, user);

// Feature Flag decision
boolean featureOn = hackleApp.isFeatureOn(featureKey, user);

// Event tracking
hackleApp.track(event, user);

import io.hackle.android.Hackle
import io.hackle.sdk.common.User
import io.hackle.sdk.common.Variation

val user = Hackle.user() {
  	userId(userId)
    property("age", 30)
    property("grade", "GOLD")
    property("is_paying_user", false)
}

// Variation distribution
val variation = hackleApp.variation(experimentKey, user)

// Feature Flag decision
val featureOn = hackleApp.isFeatureOn(featureKey, user)

// Event tracking
hackleApp.track(event, user)