UUID

UUIDs are used to record values that uniquely identify some entity, such as a client id.

Configuration

You first need to add an entry for it to the metrics.yaml file:

user:
  client_id:
    type: uuid
    description: >
      A unique identifier for the client's profile
    lifetime: user
    ...

API

Now that the UUID is defined in metrics.yaml, you can use the metric to record values in the application's code.

import org.mozilla.yourApplication.GleanMetrics.User

User.clientId.generateAndSet() // Generate a new UUID and record it
User.clientId.set(UUID.randomUUID())  // Set a UUID explicitly

There are test APIs available too.

import org.mozilla.yourApplication.GleanMetrics.User

// Was anything recorded?
assertTrue(User.clientId.testHasValue())
// Was it the expected value?
assertEquals(uuid, User.clientId.testGetValue())

import org.mozilla.yourApplication.GleanMetrics.User

User.INSTANCE.clientId.generateAndSet() // Generate a new UUID and record it
User.INSTANCE.clientId.set(UUID.randomUUID())  // Set a UUID explicitly

There are test APIs available too:

import org.mozilla.yourApplication.GleanMetrics.User

// Was anything recorded?
assertTrue(User.INSTANCE.clientId.testHasValue())
// Was it the expected value?
assertEquals(uuid, User.INSTANCE.clientId.testGetValue())

User.clientId.generateAndSet() // Generate a new UUID and record it
User.clientId.set(UUID())  // Set a UUID explicitly

There are test APIs available too.

@testable import Glean

// Was anything recorded?
XCTAssert(User.clientId.testHasValue())
// Was it the expected value?
XCTAssertEqual(uuid, try User.clientId.testGetValue())

import uuid

from glean import load_metrics
metrics = load_metrics("metrics.yaml")

# Generate a new UUID and record it
metrics.user.client_id.generate_and_set()
# Set a UUID explicitly
metrics.user.client_id.set(uuid.uuid4())

There are test APIs available too.

# Was anything recorded?
assert metrics.user.client_id.test_has_value()
# Was it the expected value?
assert uuid == metrics.user.client_id.test_get_value()

Limits

  • None.

Examples

  • A unique identifier for the client.

Recorded errors

  • None.

Reference