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# [Android Components](../../../README.md) > Service > Nimbus
A wrapper for the Nimbus SDK.
Contents:
- [Usage](#usage)
## Usage
### Setting up the dependency
Use Gradle to download the library from [maven.mozilla.org](https://maven.mozilla.org/) ([Setup repository](../../../README.md#maven-repository)):
```Groovy
implementation "org.mozilla.components:service-nimbus:{latest-version}"
```
### Initializing the Experiments library
**TODO**
### Updating of experiments
**TODO**
### Checking if a user is part of an experiment
**TODO**
## Testing Nimbus
This section contains information about the Kinto and UI schemas needed to set up and run experiments on the "Dev" Kinto instance located at https://kinto.dev.mozaws.net.
**NOTE** The dev server instance requires LDAP authorization, but does not require connection to the internal Mozilla VPN.
## Where to add the Kinto and UI schemas
For testing purposes, create a collection with an id of `nimbus-mobile-experiments` in the `main` bucket on the [Kinto dev server](https://kinto.dev.mozaws.net/v1/admin/).
### JSON Schema
```JSON
{
"type": "object",
"title": "Nimbus Schema",
"description": "This is the description of the current Nimbus experiment schema, which can be found at https://github.com/mozilla/nimbus-shared",
"default": {},
"examples": [
{
"slug": "secure-gold",
"endDate": null,
"branches": [
{
"slug": "control",
"ratio": 1
},
{
"slug": "treatment",
"ratio": 1
}
],
"probeSets": [],
"startDate": null,
"application": "org.mozilla.fenix",
"bucketConfig": {
"count": 100,
"start": 0,
"total": 10000,
"namespace": "secure-gold",
"randomizationUnit": "nimbus_id"
},
"userFacingName": "Diagnostic test experiment",
"referenceBranch": "control",
"isEnrollmentPaused": false,
"proposedEnrollment": 7,
"userFacingDescription": "This is a test experiment for diagnostic purposes.",
"id": "secure-gold"
}
],
"required": [
"slug",
"branches",
"application",
"bucketConfig",
"userFacingName",
"referenceBranch",
"isEnrollmentPaused",
"proposedEnrollment",
"userFacingDescription",
"id"
],
"properties": {
"slug": {
"$id": "#/properties/slug",
"type": "string",
"title": "Slug",
"description": "The slug is the unique identifier for the experiment.",
"default": "",
"examples": ["fenix-search-widget-experiment"]
},
"endDate": {
"$id": "#/properties/endDate",
"type": ["string", "null"],
"format": "date-time",
"title": "End Date",
"description": "This is the date that the experiment will end.",
"default": null,
"examples": [null]
},
"branches": {
"$id": "#/properties/branches",
"type": "array",
"title": "Branches",
"description": "Branches relate to the specific treatments to be applied for the experiment.",
"default": [],
"examples": [
[
{
"slug": "control",
"ratio": 1
},
{
"slug": "treatment",
"ratio": 1
}
]
],
"additionalItems": true,
"items": {
"$id": "#/properties/branches/items",
"anyOf": [
{
"$id": "#/properties/branches/items/anyOf/0",
"type": "object",
"title": "Branch Items",
"description": "Each branch has a slug, or name, and a ratio that weights selection into that branch",
"default": {},
"examples": [
{
"slug": "control",
"ratio": 1
}
],
"required": ["slug", "ratio"],
"properties": {
"slug": {
"$id": "#/properties/branches/items/anyOf/0/properties/slug",
"type": "string",
"title": "Branch Slug",
"description": "The branch slug is the unique name of the branch, within this experiment.",
"default": "control",
"examples": ["control"]
},
"ratio": {
"$id": "#/properties/branches/items/anyOf/0/properties/ratio",
"type": "integer",
"title": "Branch Ratio",
"description": "This is the weighting of the branch for branch selection.",
"default": 1,
"examples": [1]
}
},
"additionalProperties": true
}
]
}
},
"probeSets": {
"$id": "#/properties/probeSets",
"type": "array",
"title": "Probe Sets",
"description": "Currently unimplemented/used",
"default": [],
"examples": [[]],
"additionalItems": true,
"items": {
"$id": "#/properties/probeSets/items"
}
},
"startDate": {
"$id": "#/properties/startDate",
"type": ["string", "null"],
"format": "date-time",
"title": "Start Date",
"description": "The date that the experiment will start",
"default": null,
"examples": [null]
},
"application": {
"$id": "#/properties/application",
"type": "string",
"title": "Application",
"description": "This is the application to target",
"default": "",
"examples": [
"org.mozilla.fenix",
"org.mozilla.firefox",
"org.mozilla.ios.firefox"
]
},
"bucketConfig": {
"$id": "#/properties/bucketConfig",
"type": "object",
"title": "Bucket Configuration",
"description": "This is the configuration of the bucketing for determining the experiment sample size",
"default": {},
"examples": [
{
"count": 2000,
"start": 0,
"total": 10000,
"namespace": "performance-experiments",
"randomizationUnit": "nimbus_id"
}
],
"required": ["count", "start", "total", "namespace", "randomizationUnit"],
"properties": {
"count": {
"$id": "#/properties/bucketConfig/properties/count",
"type": "integer",
"title": "Count",
"description": "The total count of buckets to assign to be eligible to enroll in the experiment.",
"default": 0,
"examples": [2000]
},
"start": {
"$id": "#/properties/bucketConfig/properties/start",
"type": "integer",
"title": "Starting Bucket",
"description": "This is the bucket that the count of buckets will start from.",
"default": 0,
"examples": [0]
},
"total": {
"$id": "#/properties/bucketConfig/properties/total",
"type": "integer",
"title": "Total Buckets",
"description": "This is the total number of buckets to divide the population into for enrollment purposes.",
"default": 10000,
"examples": [10000]
},
"namespace": {
"$id": "#/properties/bucketConfig/properties/namespace",
"type": "string",
"title": "Namespace",
"description": "This is the bucket namespace and should always match the experiment slug",
"default": "",
"examples": ["secure-gold"]
},
"randomizationUnit": {
"$id": "#/properties/bucketConfig/properties/randomizationUnit",
"type": "string",
"title": "Randomization Unit",
"description": "This is the id to use for randomization for the purpose of bucketing. Currently only nimbus_id implemented.",
"default": "nimbus_id",
"examples": ["nimbus_id"]
}
},
"additionalProperties": true
},
"userFacingName": {
"$id": "#/properties/userFacingName",
"type": "string",
"title": "User Facing Name",
"description": "The user-facing name of the experiment.",
"default": "",
"examples": ["Diagnostic test experiment"]
},
"referenceBranch": {
"$id": "#/properties/referenceBranch",
"type": "string",
"title": "Reference Branch",
"description": "Not currently implemented, do not change default",
"default": "control",
"examples": ["control"]
},
"isEnrollmentPaused": {
"$id": "#/properties/isEnrollmentPaused",
"type": "boolean",
"title": "Enrollment Paused",
"description": "True if the enrollment is paused, false if enrollment is active.",
"default": false,
"examples": [false]
},
"proposedEnrollment": {
"$id": "#/properties/proposedEnrollment",
"type": "integer",
"title": "Proposed Enrollment",
"description": "The length in days that enrollment is proposed.",
"default": 7,
"examples": [7]
},
"userFacingDescription": {
"$id": "#/properties/userFacingDescription",
"type": "string",
"title": "User Facing Description",
"description": "This is the description of the experiment that would be presented to the user.",
"default": "",
"examples": ["This is a test experiment for diagnostic purposes."]
},
"id": {
"$id": "#/properties/id",
"type": "string",
"title": "ID",
"description": "An analog of the slug? Not sure, make this match slug...",
"default": "",
"examples": ["secure-gold"]
}
},
"additionalProperties": true
}
```
## UI Schema
```JSON
{
"ui:order": [
"slug",
"userFacingName",
"userFacingDescription",
"application",
"startDate",
"endDate",
"bucketConfig",
"branches",
"referenceBranch",
"isEnrollmentPaused",
"proposedEnrollment",
"id",
"probeSets"
],
"userFacingDescription": {
"ui:widget": "textarea"
},
"bucketConfig": {
"ui:order": ["start", "count", "total", "namespace", "randomizationUnit"]
},
"branches": {
"ui:order": ["slug", "ratio"]
}
}
```
## License
This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this