AutoValue for Easier Life

AutoVaulue is a library that generates Immutable value-type codes for Java 1.6+, maintained by Google, inc.

I have talked about AutoValue and AutoValue Extensions in general and some pros and cons that my team and I have figured out while developing our up with AutoValue.

While AutoValue is not applicable for ALL applications in general (For example, in Kotlin?), I am sure it may help most of the developers make their development a lot easier with scalable, maintainable generated codes and possibly additional performance optimization.

* auto/value at master · google/auto
https://github.com/google/auto/tree/master/value

* An Introduction to AutoValue
http://ryanharter.com/blog/2016/03/22/autovalue/

* A Deeper Look at AutoValue - Ryan Harter

http://ryanharter.com/blog/2016/04/08/autovalue-deep-dive/

* AutoValue Extensions - Ryan Harter

http://ryanharter.com/blog/2016/05/16/autovalue-extensions/

* AutoValue Extensions - Jake Wharton

http://jakewharton.com/auto-value-extensions-ny-android-meetup/

* Faster JSON Deserialization with AutoValue GSON extension
http://dubedout.eu/2016/07/11/faster-json-deserialization-autovalue-extension/

Transcript

1. AutoValue for Easier Life shaunkawano
2. AutoValue for Easier Life • Background of Ameba • AutoValue • Extra Android based talking
3. (One of the)
 Oldest App in CyberAgent, Inc. Own Abstraction, Unique Implementation New Team Members Inconsistency Codes Throughout the App Writing Tests, Removing Tests Unknown Specification
4. For Starting Out, We’d like to do 2 things. 2. Avoid Writing Boilerplate Codes 1. Remove Boilerplate Codes
5. AutoValue https://github.com/google/auto/tree/master/value
6. Article.class Amazingly Simple POJO
9. We want Article to be Value-Typed
10. We want Article to be Value-Typed (immutable, null-safe)
11. 1. Finalize class and fields
12. 1. Finalize class and fields 2. Add constructor
13. 1. Finalize class and fields 2. Add constructor 3. Add getters
17. Is only referential equality safe enough?
18. Override equals()
20. Override hashCode() (if use Article as key in Set or Map(s))
22. toString() is nice for debugging!
24. Parcelable?
26. Before-After
29. ~100 Lines
30. Add New Field? Remove New Field? Inner Classes with Parcelable? Adding New Parcelable Tests? Removing Parcelable Tests?
31. AutoValue https://github.com/google/auto/tree/master/value
32. Usage // root dependencies { classpath ‘com.neenbedankt.gradle.plugins:android-apt:1.8’ … } … // app dependencies { provided 'com.google.auto.value:auto-value:1.3-rc2' }
33. AutoValue
34. AutoValue • Add @AutoValue to make objects value- typed using generated boilerplate codes
35. @AutoValue
36. @AutoValue
38. AutoValue • Add @AutoValue to make objects value- typed using generated boilerplate codes
39. AutoValue • Add @AutoValue to make objects value- typed using generated boilerplate codes • Add @AutoValue.Builder to create Builder class for your auto-value object
40. @AutoValue.Builder
41. @AutoValue.Builder
43. AutoValue • Add @AutoValue to make objects value- typed using generated boilerplate codes • Add @AutoValue.Builder to create Builder class for your auto-value object
44. AutoValue • Add @AutoValue to make objects value- typed using generated boilerplate codes • Add @AutoValue.Builder to create Builder class for your auto-value object • AutoValue Extension support for 
 Parcelable, Gson, Moshi, Cursor, and more..
45. Usage(auto-value-parcel) // root dependencies { classpath ‘com.neenbedankt.gradle.plugins:android-apt:1.8’ … } … // app dependencies { provided ‘com.google.auto.value:auto-value:1.3-rc2' // auto-value-parcel apt 'com.ryanharter.auto.value:auto-value-parcel:0.2.3-rc2' }
46. Usage(auto-value-parcel) // root dependencies { classpath ‘com.neenbedankt.gradle.plugins:android-apt:1.8’ … } … // app dependencies { provided ‘com.google.auto.value:auto-value:1.3-rc2' // auto-value-parcel apt 'com.ryanharter.auto.value:auto-value-parcel:0.2.3-rc2' }
47. AutoValue Extension: auto-value-parcel
48. AutoValue Extension: auto-value-parcel
50. // AutoValue provided 'com.google.auto.value:auto-value:1.3-rc2' apt 'com.ryanharter.auto.value:auto-value-parcel:0.2.3-rc2' apt 'com.ryanharter.auto.value:auto-value-gson:0.3.2-rc1' apt 'com.gabrielittner.auto.value:auto-value-with:1.0.0-rc1' AutoValue in Our App
51. Extra
52. Extra 1. AutoValue Cos 2. AutoValue Pros
53. AutoValue Cons ɾStrict Null Safety ɾCostly Field Update
54. Costly Field Update
55. Costly Field Update mSomeValue.value = “value”
56. Costly Field Update mSomeValue.value = “value” Not Accessible OF COURSE.
57. Costly Field Update mSomeValue = newValue
58. “With-er” auto-value-with public abstract SomeValue withNewId(String newId); @Override public final SomeValue withNewId(String newId) { return new AutoValue_SomeValue(newId); } Generated Code:
59. “With-er” auto-value-with public abstract SomeValue withNewId(String newId); @Override public final SomeValue withNewId(String newId) { return new AutoValue_SomeValue(newId); } Generated Code:
60. “With-er” auto-value-with mSomeValue = mSomeValue.witNewId(newId);
61. Strict Null Safety
62. Strict Null Safety Non-fatal Exception: java.lang.IllegalStateException: Missing required properties: someValue …
63. AutoValue Pros
64. AutoValue Pros ɾCommunication with Server Engineers ɾFaster JSON De/Serialization
65. Faster JSON De/Serialization
66. auto-value-gson // The public static method returning a TypeAdapter<Foo> is what // tells auto-value-gson to create a TypeAdapter for Foo. public static TypeAdapter<Foo> typeAdapter(Gson gson) { return new AutoValue_Foo.GsonTypeAdapter(gson); } } final Gson gson = new GsonBuilder() .registerTypeAdapterFactory(new AutoValueGsonTypeAdapterFactory()) .create(); https://github.com/rharter/auto-value-gson
67. http://dubedout.eu/2016/07/11/faster-json-deserialization-autovalue-extension/
68. http://dubedout.eu/2016/07/11/faster-json-deserialization-autovalue-extension/ “We gain from 200% to 400% speed.”
69. Communication with Server Engineers
70. Non-fatal Exception: java.lang.IllegalStateException: Missing required properties: someValue …
71. “Is this value @Nullable”?
72. “Is this value @Nullable”? “Is this document Updated?”
73. More Active Communication Between Native Engineers and Server-side Engineers!
74. Let’s use AutoValue for making our life easier!
75. AutoValue for Easier Life shaunkawano fin.