TART: Tracing Action Response Times

by androidexample

Square Tart

Tracing Action Response Times!

This library is not stable for usage beyond Square, the APIs and internals might change anytime.

Tart… ?

Table of contents

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Usage

Add the tart dependency to your library or app’s build.gradle file:

dependencies {
  implementation 'com.squareup.tart:tart:0.1'
}

Then add a new AppLaunch.onAppLaunchListeners. See AppLaunch javadoc for details.

import android.app.Application
import tart.AppLaunch
import tart.PreLaunchState

class ExampleApplication : Application() {
  override fun onCreate() {
    super.onCreate()
    AppLaunch.onAppLaunchListeners += { appLaunch ->
      val startType = when (appLaunch.preLaunchState) {
        NO_PROCESS -> "cold start"
        NO_PROCESS_FIRST_LAUNCH_AFTER_INSTALL -> "cold start"
        NO_PROCESS_FIRST_LAUNCH_AFTER_UPGRADE -> "cold start"
        NO_PROCESS_FIRST_LAUNCH_AFTER_CLEAR_DATA -> "cold start"
        PROCESS_WAS_LAUNCHING_IN_BACKGROUND -> "warm start"
        NO_ACTIVITY_NO_SAVED_STATE -> "warm start"
        NO_ACTIVITY_BUT_SAVED_STATE -> "warm start"
        ACTIVITY_WAS_STOPPED -> "hot start"
      }
      val durationMillis = appLaunch.duration.uptime(MILLISECONDS)
      println("$startType launch: $durationMillis ms")
    }
  }
}

FAQ

It’s not really a question, more like a comment..

License

Copyright 2021 Square Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

GitHub

https://github.com/square/tart