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Code generating your way to happiness Zac Sweers - Uber @pandanomic

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"Code generating your way to happiness."

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FileSpec.builder("", "Presentation") .addComment("Code generating your way to happiness.") .addAnnotation(AnnotationSpec.builder(Author::class) .addMember("name", "%S", "Zac Sweers") .useSiteTarget(FILE) .build()) .build()

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FileSpec.builder("", "Presentation") .addComment("Code generating your way to happiness.") .addAnnotation(AnnotationSpec.builder(Author::class) .addMember("name", "%S", "Zac Sweers") .useSiteTarget(FILE) .build()) .build()

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FileSpec.builder("", "Presentation") .addComment("Code generating your way to happiness.") .addAnnotation(AnnotationSpec.builder(Author::class) .addMember("name", "%S", "Zac Sweers") .useSiteTarget(FILE) .build()) .build()

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FileSpec.builder("", "Presentation") .addComment("Code generating your way to happiness.") .addAnnotation(AnnotationSpec.builder(Author::class) .addMember("name", "%S", "Zac Sweers") .useSiteTarget(FILE) .build()) .build()

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FileSpec.builder("", "Presentation") .addComment("Code generating your way to happiness.") .addAnnotation(AnnotationSpec.builder(Author::class) .addMember("name", "%S", "Zac Sweers") .useSiteTarget(FILE) .build()) .build()

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FileSpec.builder("", "Presentation") .addComment("Code generating your way to happiness.") .addAnnotation(AnnotationSpec.builder(Author::class) .addMember("name", "%S", "Zac Sweers") .useSiteTarget(FILE) .build()) .build()

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// Code generating your way to happiness. @file:Author(name = "Zac Sweers") Presentation.kt

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FileSpec.builder("", "Presentation")a .addComment("Code generating your way to happiness.") .addAnnotation(AnnotationSpec.builder(Author::class) .addMember("name", "%S", "Zac Sweers") .useSiteTarget(FILE) .build()) .build()b

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FileSpec.builder("", presentationName)a .addComment("Code generating your way to happiness.") .addAnnotation(AnnotationSpec.builder(Author::class) .addMember("name", "%S", "Zac Sweers") .useSiteTarget(FILE) .build()) .build()b

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FileSpec.builder("", presentationName)a .addComment(comment) .addAnnotation(AnnotationSpec.builder(Author::class) .addMember("name", "%S", "Zac Sweers") .useSiteTarget(FILE) .build()) .build()b

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FileSpec.builder("", presentationName)a .addComment(comment) .addAnnotation(AnnotationSpec.builder(Author::class) .addMember("name", "%S", author) .useSiteTarget(FILE) .build()) .build()b

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presentations.onEach { (presentationName, comment, author) -> FileSpec.builder("", presentationName)a .addComment(comment) .addAnnotation(AnnotationSpec.builder(Author::class) .addMember("name", "%S", author) .useSiteTarget(FILE) .build()) .build()b }

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conferences .flatMap { it.presentations } .onEach { (presentationName, comment, author) -> FileSpec.builder("", presentationName)a .addComment(comment) .addAnnotation(AnnotationSpec.builder(Author::class) .addMember("name", "%S", author) .useSiteTarget(FILE) .build()) .build()b } Boilerplate

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Benefits • Boilerplate avoidance

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Benefits • Boilerplate avoidance • Correctness

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Correctness class Person(val firstName: String, val lastName: String)m

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class Person(val firstName: String, val lastName: String)m class PersonJsonAdapter : JsonAdapter() {a }l

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class Person(val firstName: String, val lastName: String)m class PersonJsonAdapter : JsonAdapter() {a override fun fromJson(reader: JsonReader): Person? {b }k }l

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class Person(val firstName: String, val lastName: String)m class PersonJsonAdapter : JsonAdapter() {a override fun fromJson(reader: JsonReader): Person? {b lateinit var firstName: Stringc lateinit var lastName: Stringd }k }l

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class Person(val firstName: String, val lastName: String)m class PersonJsonAdapter : JsonAdapter() {a override fun fromJson(reader: JsonReader): Person? {b lateinit var firstName: Stringc lateinit var lastName: Stringd return Person(firstName, lastName)j }k }l

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class Person(val firstName: String, val lastName: String)m class PersonJsonAdapter : JsonAdapter() {a override fun fromJson(reader: JsonReader): Person? {b lateinit var firstName: Stringc lateinit var lastName: Stringd while (reader.hasNext()) {e }n return Person(firstName, lastName)j }k }l

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class Person(val firstName: String, val lastName: String)m class PersonJsonAdapter : JsonAdapter() {a override fun fromJson(reader: JsonReader): Person? {b lateinit var firstName: Stringc lateinit var lastName: Stringd while (reader.hasNext()) {e when (reader.nextName()) {f }o }n return Person(firstName, lastName)j }k }l

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class Person(val firstName: String, val lastName: String)m class PersonJsonAdapter : JsonAdapter() {a override fun fromJson(reader: JsonReader): Person? {b lateinit var firstName: Stringc lateinit var lastName: Stringd while (reader.hasNext()) {e when (reader.nextName()) {f "firstName" -> firstName = reader.nextString()g }o }n return Person(firstName, lastName)j }k }l

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class Person(val firstName: String, val lastName: String)m class PersonJsonAdapter : JsonAdapter() {a override fun fromJson(reader: JsonReader): Person? {b lateinit var firstName: Stringc lateinit var lastName: Stringd while (reader.hasNext()) {e when (reader.nextName()) {f "firstName" -> firstName = reader.nextString()g "lastName" -> lastName = reader.nextString()h }o }n return Person(firstName, lastName)j }k }l

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class Person(val firstName: String, val lastName: String)m class PersonJsonAdapter : JsonAdapter() {a override fun fromJson(reader: JsonReader): Person? {b lateinit var firstName: Stringc lateinit var lastName: Stringd while (reader.hasNext()) {e when (reader.nextName()) {f "firstName" -> firstName = reader.nextString()g "lastName" -> lastName = reader.nextString()h else -> reader.skipValue()i }o }n return Person(firstName, lastName)j }k }l

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class Person(val firstName: String, val lastName: String)m class PersonJsonAdapter : JsonAdapter() {a override fun fromJson(reader: JsonReader): Person? {b lateinit var firstName: Stringc lateinit var lastName: Stringd while (reader.hasNext()) {e when (reader.nextName()) {f "firstname" -> firstName = reader.nextString()g "lastName" -> lastName = reader.nextString()h else -> reader.skipValue()i }o }n return Person(firstName, lastName)j }k }l

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class Person(val firstName: String, val lastName: String)m class PersonJsonAdapter : JsonAdapter() {a override fun fromJson(reader: JsonReader): Person? {b lateinit var firstName: Stringc lateinit var lastName: Stringd while (reader.hasNext()) {e when (reader.nextName()) {f "firstname" -> firstName = reader.nextString()g "lastName" -> lastName = reader.nextString()h else -> reader.skipValue()i }o }n return Person(lastName, firstName)j }k }l

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class Person(val firstName: String?, val lastName: String)m class PersonJsonAdapter : JsonAdapter() {a override fun fromJson(reader: JsonReader): Person? {b lateinit var firstName: Stringc lateinit var lastName: Stringd while (reader.hasNext()) {e when (reader.nextName()) {f "firstname" -> firstName = reader.nextString()g "lastName" -> lastName = reader.nextString()h else -> reader.skipValue()i }o }n return Person(lastName, firstName)j }k }l

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class Person(val firstName: String, val lastName: String)m

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class Person(val firstName: String, val lastName: String)m class City(val name: String, val country: String) class Vehicle(val licensePlate: String) class Restaurant(val type: String, val address: Address) class Payment(val cardNumber: String, val type: String) class TipAmount(val value: Double) class Rating(val numStars: Int) class Correctness(val confidence: Double)

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Benefits • Boilerplate • Correctness

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Recognizing • Boilerplate • Correctness Boilerplate Ceremony Value types! Especially if you have specs! Tests too

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Tools

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Tools •JavaPoet/KotlinPoet

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Tools •JavaPoet/KotlinPoet •Templating

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Tools •JavaPoet/KotlinPoet •Templating •SPI

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Tools •JavaPoet/KotlinPoet •Templating •SPI •Compile Testing

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Tools •JavaPoet/KotlinPoet •Templating •SPI •Compile Testing •Annotation Processing (APT)

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Tools •JavaPoet/KotlinPoet •Templating •SPI •Compile Testing •Annotation Processing (APT) •Gradle

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Examples

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Butter Knife

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Butter Knife TextView title;a void onCreate(Bundle savedInstanceState) {c title = findViewById(R.id.title);d }f

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Butter Knife TextView title;a ImageView icon;b void onCreate(Bundle savedInstanceState) {c title = findViewById(R.id.title);d }f

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Butter Knife TextView title;a ImageView icon;b void onCreate(Bundle savedInstanceState) {c title = findViewById(R.id.title);d icon = findViewById(R.id.icon);e }f

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Butter Knife @BindView(R.id.title) TextView title;a @BindView(R.id.icon) ImageView icon;b void onCreate(Bundle savedInstanceState) {c ButterKnife.bind(this); }f

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Butter Knife @BindView(R.id.title) TextView title;a @BindView(R.id.icon) ImageView icon;b @BindView(R.id.button) Button button; void onCreate(Bundle savedInstanceState) {c ButterKnife.bind(this);g }f

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Butter Knife @BindView(R.id.title) TextView title;a void onCreate(Bundle savedInstanceState) {c ButterKnife.bind(this); }f

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@BindView(R.id.title) TextView title;

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// FooActivity @BindView(R.id.title) TextView title;

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// FooActivity @BindView(R.id.title) TextView title;

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// FooActivity @BindView(R.id.title) TextView title;

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// FooActivity @BindView(2131361859) TextView title;

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// FooActivity @BindView(2131361859) TextView title;

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// FooActivity @BindView(2131361859) TextView title;

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// FooActivity @BindView(2131361859) TextView title;

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ViewBinding( target = "FooActivity", id = 2131361859, name = "title", type = "field", viewType = TextView.class )

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public final class FooActivity_ViewBinding implements Unbinder { private FooActivity target; @UiThread public FooActivity_ViewBinding(FooActivity target, View source) { this.target = target; target.title = Utils.findRequiredViewAsType(source, 2131361859, // R.id.title "field 'title'", TextView.class); }a }b

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@BindView(R.id.title) TextView title;a void onCreate(Bundle savedInstanceState) {c ButterKnife.bind(this); }f public final class FooActivity_ViewBinding implements Unbinder { private FooActivity target; @UiThread public FooActivity_ViewBinding(FooActivity target, View source) { this.target = target; target.title = Utils.findRequiredViewAsType(source, 2131361859, // R.id.title "field 'title'", TextView.class); }a }b APT Runtime

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Butter Knife

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RxBinding

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RxBinding KotlinGenTask Generates all these!

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public static Observable clicks(View view) { return new ViewClickObservable(view); }

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fun View.clicks(): Observable = RxView.clicks(this)a

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fun View.clicks(): Observable = RxView.clicks(this)a

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fun View.clicks(): Observable = RxView.clicks(this)a public static Observable clicks(View view) { return new ViewClickObservable(view); }b

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fun View.clicks(): Observable = RxView.clicks(this)a public static Observable clicks(View view) { return new ViewClickObservable(view); }b

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fun View.clicks(): Observable = RxView.clicks(this)a public static Observable clicks(View view) { return new ViewClickObservable(view); }b

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fun View.clicks(): Observable = RxView.clicks(this)a public static Observable clicks(View view) { return new ViewClickObservable(view); }b

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fun View.clicks(): Observable = RxView.clicks(this)a public static Observable clicks(View view) { return new ViewClickObservable(view); }b

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fun View.clicks(): Observable = RxView.clicks(this)a public static Observable clicks(View view) {a return new ViewClickObservable(view); }b

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public static Observable clicks(View view) {a return new ViewClickObservable(view); }b

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// RxView public static Observable clicks(View view) {a return new ViewClickObservable(view); }b

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BindingMethod( target = "RxView", name = "clicks", type = View.class, returnType = "Observable" )b

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BindingMethod( target = "RxView", name = "clicks", type = View.class, returnType = "Observable" )b

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fun View.clicks(): Observable = RxView.clicks(this)a

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RxBinding

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Service Gen

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@AutoValuea abstract class Rider {b abstract String uuid();c abstract String firstName();d abstract String lastName();e abstract Address address();f }g Service Gen

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interface UberService {a @GET("/rider")b Rider getRider()c }d

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interface UberService {a @GET("/rider")b Single getRider()c }d

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struct Rider { 1: required string uuid; 2: required string firstName; 3: required string lastName; 4: optional Address address; }

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@AutoValuea abstract class Rider {b abstract String uuid();c abstract String firstName();d abstract String lastName();e abstract Address address();f }g

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@AutoValuea abstract class Rider {b abstract String uuid();c abstract String firstName();d abstract String lastName();e abstract Address address();f static JsonAdapter jsonAdapter(Moshi moshi) { return new AutoValue_Rider.JsonAdapter(moshi); } }g

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service UberService {a Rider getRider() }b

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service UberService {a Rider getRider() (path="/rider") }b

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interface UberService { @GET("/rider") Single getRider() }

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service UberService { Rider getRider() }

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astruct Rider

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astruct Rider struct City struct Vehicle struct Restaurant struct Payment struct TipAmount struct Rating

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astruct Rider struct City struct Vehicle struct Restaurant struct Payment struct TipAmount struct Rating // And 6000 more

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class ModelsAdapterFactory implements JsonAdapter.Factory { @Override public JsonAdapter> create(Type type, Set extends Annotation> annotations, Moshi moshi) { Class> rawType = Types.getRawType(type); if (rawType.isAssignableFrom(Rider.class)) { return Rider.adapter(moshi); } else if (rawType.isAssignableFrom(City.class)) { return City.adapter(moshi); } else if (rawType.isAssignableFrom(Vehicle.class)) { return Vehicle.adapter(moshi); } // Etc etc return null; } }

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astruct Rider struct City struct Vehicle struct Restaurant struct Payment struct TipAmount struct Rating //aAnd 6000 more

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//aAnd 6000 more

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//aAnd 6000 more Rider EATS Payments Driver GiftCard Pricing

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Rider GiftCard Pricing Driver EATS Payments

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Rider - build.gradle GiftCard - build.gradle Pricing - build.gradle Driver - build.gradle EATS - build.gradle Payments - build.gradle

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Rider - build.gradle GiftCard - build.gradle Pricing - build.gradle Driver - build.gradle EATS - build.gradle Payments - build.gradle

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Rider GiftCard Pricing Driver EATS Payments

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xclass RiderModelFactory class GiftCardModelFactory class PricingModelFactory class DriverModelFactory class EATSModelFactory class PaymentsModelFactory

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xclass RiderModelFactory

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xclass RiderModelFactory // -> json

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xclass RiderModelFactory // -> json // -> ridermodelfactory-fractory.binx

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class RiderModelFactory // -> json // -> ridermodelfactory-fractory.bin class MyAppGlobalFactory // Delegates to all discovered fractories

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class RiderModelFactory // -> json // -> ridermodelfactory-fractory.bin class MyAppGlobalFactory // Delegates to all discovered fractories Fractory C om ing Soon™

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.thrift Thrifty "Jenga" .java APT AutoValueProcessor auto-value-moshi fractory Pre-build Compilation *SPI* Project Gen *Gradle* *Templating* *JavaPoet*

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Tools •JavaPoet •KotlinPoet •Templating •SPI •Compile Testing •Annotation Processing (APT) •Gradle

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Pitfalls

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BLOAT

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Rider app a

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Rider app a b 10% Dagger

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Rider app a b 10% Dagger c 25% Models

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struct Rider { 1: required string uuid; 2: required string firstName; 3: required string lastName; 4: optional Address address; }a

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struct Rider { 1: required string uuid; 2: required string firstName; 3: required string lastName; 4: optional Address address; }a

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struct Rider { 1: required string uuid; 2: required string firstName; 3: required string lastName; }a

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struct Rider { 1: required string uuid; 2: required string firstName; 3: required string lastName; }a service UberService {a Rider getRider() }b

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struct Rider { 1: required string uuid; 2: required string firstName; 3: required string lastName; }a service UberService {a Rider getRider() }b

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struct Rider { 1: required string uuid; 2: required string firstName; 3: required string lastName; }a service UberService {a Rider getRider() }b

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Rider app a b c

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Rider app a b c $$

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Fin Zac Sweers - Uber @pandanomic