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Jetpack Compose internals

Jorge Castillo

Jetpack Compose is the future of Android UI. Master how it works internally and become a more efficient developer with it. You'll also find it valuable if you are not an Android dev. This book provides all the details to understand how the Compose compiler & runtime work, and how to create a client library using them.

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About

About

About the Book

This book explores the guts of Jetpack Compose, the brand new library by Google and the Android team that will become the future of Android UI. Dedicating time now to learn about its internals in-depth will yield powerful skills to write modern and efficient Android apps in the future.

If you are interested in other use cases of Jetpack Compose rather than Android, this book has got you covered also. Jetpack Compose internals is very focused on exploring the compiler and runtime from a generic perspective, making the overall experience very agnostic of the target platform. The book also provides a chapter dedicated to diverse use cases for Jetpack Compose, which exposes a few really interesting examples over code.

Jetpack Compose and Android are trademarks of Google LLC and this book is not endorsed by or affiliated with Google in any way.

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SoftwareComputers and ProgrammingJavaKotlinSoftware ArchitectureSoftware Engineering

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Author

About the Author

Jorge Castillo

Jorge is a Google Developer Expert (GDE) for Android and Kotlin that has been traditionally very active in the Android community.

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Contents

Table of Contents

Prelude

  1. Why to read this book
  2. What this book is not about
  3. Why to write about internals
  4. Keep the sources close
  5. Code snippets and examples

1. Composable functions

  1. The meaning of Composable functions
  2. Properties of Composable functions
  3. Calling context
  4. Idempotent
  5. Free of uncontrolled side effects
  6. Restartable
  7. Fast execution
  8. Positional memoization
  9. Similarities with suspend functions
  10. The color of Composable functions
  11. Composable function types

2. The Compose compiler

  1. A Kotlin compiler plugin
  2. Compose annotations
  3. Registering Compiler extensions
  4. Kotlin Compiler version
  5. Static analysis
  6. Static Checkers
  7. Call checks
  8. Type checks
  9. Declaration checks
  10. Diagnostic suppression
  11. Runtime version check
  12. Code generation
  13. The Kotlin IR
  14. Lowering
  15. Inferring class stability
  16. Enabling live literals
  17. Compose lambda memoization
  18. Injecting the Composer
  19. Comparison propagation
  20. Default parameters
  21. Control flow group generation
  22. Klib and decoy generation

3. The Compose runtime

  1. The slot table and the list of changes
  2. The slot table in depth
  3. The list of changes
  4. The Composer
  5. Feeding the Composer
  6. Modeling the Changes
  7. Optimizing when to write
  8. Writing and reading groups
  9. Remembering values
  10. Recompose scopes
  11. SideEffects in the Composer
  12. Storing CompositionLocals
  13. Storing source information
  14. Linking Compositions via CompositionContext
  15. Accessing the current State snapshot
  16. Navigating the nodes
  17. Keeping reader and writer in sync
  18. Applying the changes
  19. Performance when building the node tree
  20. How changes are applied
  21. Attaching and drawing the nodes
  22. Composition
  23. Creating a Composition
  24. The initial Composition process
  25. Applying changes after initial Composition
  26. Additional information about the Composition
  27. The Recomposer
  28. Spawning the Recomposer
  29. Recomposition process
  30. Concurrent recomposition
  31. Recomposer states

4. Compose UI

  1. Integrating UI with the Compose runtime
  2. Mapping scheduled changes to actual changes to the tree
  3. Composition from the point of view of Compose UI
  4. Subcomposition from the point of view of Compose UI
  5. Reflecting changes in the UI
  6. Different types of Appliers
  7. Materializing a new LayoutNode
  8. Closing the circle
  9. Materializing a change to remove nodes
  10. Materializing a change to move nodes
  11. Materializing a change to clear all the nodes
  12. Measuring in Compose UI
  13. Measuring policies
  14. Intrinsic measurements
  15. Layout Constraints
  16. LookaheadLayout
  17. Modeling modifier chains
  18. Setting modifiers to the LayoutNode
  19. How LayoutNode ingests new modifiers
  20. Drawing the node tree
  21. Semantics in Jetpack Compose
  22. Notifying about semantic changes
  23. Merged and unmerged semantic trees

5. State snapshot system

  1. What snapshot state is
  2. Concurrency control systems
  3. Multiversion concurrency control (MCC or MVCC)
  4. The Snapshot
  5. The snapshot tree
  6. Snapshots and threading
  7. Observing reads and writes
  8. MutableSnapshots
  9. GlobalSnapshot and nested snapshots
  10. StateObjects and StateRecords
  11. Reading and writing state
  12. Removing or reusing obsolete records
  13. Change propagation
  14. Merging write conflicts

6. Effects and effect handlers

  1. Introducing side effects
  2. Side effects in Compose
  3. What we need
  4. Effect Handlers
  5. Non suspended effects
  6. Suspended effects
  7. Third party library adapters

7. Advanced Compose Runtime use cases

  1. Compose runtime vs Compose UI
  2. (Re-) Introducing composition
  3. Composition of vector graphics
  4. Building vector image tree
  5. Integrating vector composition into Compose UI
  6. Managing DOM with Compose
  7. Standalone composition in the browser
  8. Conclusion

Contributor

About the Contributors

Andrei Shikov

Andrei wrote the chapter about "Advanced Compose runtime use cases", one of the most interesting chapters in the book. It showcases how to create client libraries that leverage all the power of the Compose runtime.

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