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AutoValue for Easier Life
shaunkawano
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AutoValue for Easier Life
• Background of Ameba
• AutoValue
• Extra
Android based talking
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(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
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For Starting Out, We’d like to do 2
things.
2. Avoid Writing Boilerplate Codes
1. Remove Boilerplate Codes
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AutoValue
https://github.com/google/auto/tree/master/value
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Article.class
Amazingly Simple POJO
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We want Article to be
Value-Typed
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We want Article to be
Value-Typed
(immutable, null-safe)
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1. Finalize class and fields
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1. Finalize class and fields
2. Add constructor
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1. Finalize class and fields
2. Add constructor
3. Add getters
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Is only referential equality
safe enough?
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Override equals()
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Override hashCode()
(if use Article as key in Set or
Map(s))
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toString() is nice for
debugging!
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Parcelable?
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Before-After
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~100 Lines
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Add New Field?
Remove New Field?
Inner Classes with Parcelable?
Adding New Parcelable Tests?
Removing Parcelable Tests?
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AutoValue
https://github.com/google/auto/tree/master/value
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Usage
// root
dependencies {
classpath ‘com.neenbedankt.gradle.plugins:android-apt:1.8’
…
}
…
// app
dependencies {
provided 'com.google.auto.value:auto-value:1.3-rc2'
}
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AutoValue
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AutoValue
• Add @AutoValue to make objects value-
typed using generated boilerplate codes
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@AutoValue
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@AutoValue
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AutoValue
• Add @AutoValue to make objects value-
typed using generated boilerplate codes
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AutoValue
• Add @AutoValue to make objects value-
typed using generated boilerplate codes
• Add @AutoValue.Builder to create Builder
class for your auto-value object
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@AutoValue.Builder
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@AutoValue.Builder
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AutoValue
• Add @AutoValue to make objects value-
typed using generated boilerplate codes
• Add @AutoValue.Builder to create Builder
class for your auto-value object
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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..
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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'
}
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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'
}
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AutoValue Extension:
auto-value-parcel
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AutoValue Extension:
auto-value-parcel
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// 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
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Extra
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Extra
1. AutoValue Cos
2. AutoValue Pros
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AutoValue Cons
ɾStrict Null Safety
ɾCostly Field Update
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Costly Field Update
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Costly Field Update
mSomeValue.value = “value”
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Costly Field Update
mSomeValue.value = “value”
Not Accessible OF COURSE.
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Costly Field Update
mSomeValue = newValue
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“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:
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“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:
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“With-er”
auto-value-with
mSomeValue = mSomeValue.witNewId(newId);
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Strict Null Safety
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Strict Null Safety
Non-fatal Exception:
java.lang.IllegalStateException:
Missing required properties:
someValue
…
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AutoValue Pros
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AutoValue Pros
ɾCommunication with Server Engineers
ɾFaster JSON De/Serialization
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Faster JSON De/Serialization
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auto-value-gson
// The public static method returning a TypeAdapter is what
// tells auto-value-gson to create a TypeAdapter for Foo.
public static TypeAdapter 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
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http://dubedout.eu/2016/07/11/faster-json-deserialization-autovalue-extension/
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http://dubedout.eu/2016/07/11/faster-json-deserialization-autovalue-extension/
“We gain from 200% to 400% speed.”
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Communication with Server Engineers
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Non-fatal Exception:
java.lang.IllegalStateException:
Missing required properties:
someValue
…
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“Is this value @Nullable”?
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“Is this value @Nullable”?
“Is this document Updated?”
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More Active Communication
Between Native Engineers and
Server-side Engineers!
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Let’s use AutoValue for making
our life easier!
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AutoValue for Easier Life
shaunkawano fin.