Protobuf in Kotlin

Transcript

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2. @takusemba
   https://github.com/TakuSemba
   

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3. Protocol Buffers
   

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4. Json Protocol buffers
   

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9. Wire
   Clean, lightweight protocol buffers for Android and Java.
   

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10. syntax = "proto3";
    package com.takusemba;
    option java_package = "com.takusemba.proto";
    enum Size {
    SMALL = 0;
    MEDIUM = 1;
    LARGE = 2;
    }
    message Coffee {
    string name = 1; // espresso
    double price = 2; // 340
    Size size = 3; // small / medium / large
    bool isAvailable = 4; // true / false
    }
    

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13. data class Coffee(
    /**
    * ex) espresso
    */
    @field:WireField(tag = 1, adapter = "com.squareup.wire.ProtoAdapter#STRING")
    val name: String? = null,
    /**
    * ex) 340
    */
    @field:WireField(tag = 2, adapter = "com.squareup.wire.ProtoAdapter#DOUBLE")
    val price: Double? = null,
    /**
    * ex) small / medium / large
    */
    @field:WireField(tag = 3, adapter = "com.takusemba.proto.Size#ADAPTER")
    val size: Size? = null,
    /**
    * ex) true / false
    */
    @field:WireField(tag = 4, adapter = "com.squareup.wire.ProtoAdapter#BOOL")
    val isAvailable: Boolean? = null,
    val unknownFields: ByteString = ByteString.EMPTY
    ) : Message(ADAPTER, unknownFields) {
    …
    }
    

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14. data class Coffee(
    /**
    * ex) espresso
    */
    @field:WireField(tag = 1, adapter = "com.squareup.wire.ProtoAdapter#STRING")
    val name: String? = null,
    /**
    * ex) 340
    */
    @field:WireField(tag = 2, adapter = "com.squareup.wire.ProtoAdapter#DOUBLE")
    val price: Double? = null,
    /**
    * ex) small / medium / large
    */
    @field:WireField(tag = 3, adapter = "com.takusemba.proto.Size#ADAPTER")
    val size: Size? = null,
    /**
    * ex) true / false
    */
    @field:WireField(tag = 4, adapter = "com.squareup.wire.ProtoAdapter#BOOL")
    val isAvailable: Boolean? = null,
    val unknownFields: ByteString = ByteString.EMPTY
    ) : Message(ADAPTER, unknownFields) {
    …
    }
    val name: String? = null,
    val price: Double? = null,
    val size: Size? = null,
    val isAvailable: Boolean? = null,
    

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15. data class Coffee(
    /**
    * ex) espresso
    */
    @field:WireField(tag = 1, adapter = "com.squareup.wire.ProtoAdapter#STRING")
    val name: String? = null,
    /**
    * ex) 340
    */
    @field:WireField(tag = 2, adapter = "com.squareup.wire.ProtoAdapter#DOUBLE")
    val price: Double? = null,
    /**
    * ex) small / medium / large
    */
    @field:WireField(tag = 3, adapter = "com.takusemba.proto.Size#ADAPTER")
    val size: Size? = null,
    /**
    * ex) true / false
    */
    @field:WireField(tag = 4, adapter = "com.squareup.wire.ProtoAdapter#BOOL")
    val isAvailable: Boolean? = null,
    val unknownFields: ByteString = ByteString.EMPTY
    ) : Message(ADAPTER, unknownFields) {
    …
    }
    data class Coffee(
    

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16. --java_interop
    

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17. --java_interop
    val coffee = Coffee(
    name = "espresso",
    price = 310.0,
    size = Size.SMALL,
    isAvailable = true
    )
    

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18. --java_interop
    val coffee = Coffee(
    name = "espresso",
    price = 310.0,
    size = Size.SMALL,
    isAvailable = true
    )
    val coffee = Coffee.Builder()
    .name("espresso")
    .price(310.0)
    .size(Size.SMALL)
    .isAvailable(true)
    .build()
    

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19. --java_interop
    val coffee = Coffee(
    name = "espresso",
    price = 310.0,
    size = Size.SMALL,
    isAvailable = true
    )
    val coffee = Coffee.Builder()
    .name("espresso")
    .price(310.0)
    .size(Size.SMALL)
    .isAvailable(true)
    .build()
    val name: String
    

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20. --java_interop
    val coffee = Coffee(
    name = "espresso",
    price = 310.0,
    size = Size.SMALL,
    isAvailable = true
    )
    val coffee = Coffee.Builder()
    .name("espresso")
    .price(310.0)
    .size(Size.SMALL)
    .isAvailable(true)
    .build()
    val name: String @JvmField val name: String
    

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21. kotlin nullability
    

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22. kotlin nullability
    syntax = "proto3";
    package com.takusemba;
    option java_package = "com.takusemba.proto";
    enum Size {
    SMALL = 0;
    MEDIUM = 1;
    LARGE = 2;
    }
    message Coffee {
    string name = 1; // espresso
    double price = 2; // 340
    Size size = 3; // small / medium / large
    bool isAvailable = 4; // true / false
    }
    

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23. kotlin nullability
    syntax = "proto3";
    package com.takusemba;
    option java_package = "com.takusemba.proto";
    enum Size {
    SMALL = 0;
    MEDIUM = 1;
    LARGE = 2;
    }
    message Coffee {
    string name = 1; // espresso
    double price = 2; // 340
    Size size = 3; // small / medium / large
    bool isAvailable = 4; // true / false
    }
    syntax = "proto3";
    

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24. kotlin nullability
    syntax = “proto2";
    package com.takusemba;
    option java_package = "com.takusemba.proto";
    enum Size {
    SMALL = 0;
    MEDIUM = 1;
    LARGE = 2;
    }
    message Coffee {
    string name = 1; // espresso
    double price = 2; // 340
    Size size = 3; // small / medium / large
    bool isAvailable = 4; // true / false
    }
    syntax = “proto2";
    

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25. kotlin nullability
    syntax = “proto2";
    package com.takusemba;
    option java_package = "com.takusemba.proto";
    enum Size {
    SMALL = 0;
    MEDIUM = 1;
    LARGE = 2;
    }
    message Coffee {
    string name = 1; // espresso
    double price = 2; // 340
    Size size = 3; // small / medium / large
    bool isAvailable = 4; // true / false
    }
    message Coffee {
    string name = 1; // espresso
    double price = 2; // 340
    Size size = 3; // small / medium / large
    bool isAvailable = 4; // true / false
    }
    

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26. kotlin nullability
    syntax = "proto2";
    package com.takusemba;
    option java_package = "com.takusemba.proto";
    enum Size {
    SMALL = 0;
    MEDIUM = 1;
    LARGE = 2;
    }
    message Coffee {
    required string name = 1; // espresso
    required double price = 2; // 340
    required Size size = 3; // small / medium / large
    optional bool isAvailable = 4; // true / false
    }
    message Coffee {
    required string name = 1; // espresso
    required double price = 2; // 340
    required Size size = 3; // small / medium / large
    optional bool isAvailable = 4; // true / false
    }
    

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27. kotlin nullability
    syntax = "proto2";
    package com.takusemba;
    option java_package = "com.takusemba.proto";
    enum Size {
    SMALL = 0;
    MEDIUM = 1;
    LARGE = 2;
    }
    message Coffee {
    required string name = 1; // espresso
    required double price = 2; // 340
    required Size size = 3; // small / medium / large
    optional bool isAvailable = 4; // true / false
    }
    

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28. data class Coffee(
    /**
    * ex) espresso
    */
    @field:WireField(tag = 1, adapter = "com.squareup.wire.ProtoAdapter#STRING")
    val name: String,
    /**
    * ex) 340
    */
    @field:WireField(tag = 2, adapter = "com.squareup.wire.ProtoAdapter#DOUBLE")
    val price: Double,
    /**
    * ex) small / medium / large
    */
    @field:WireField(tag = 3, adapter = "com.takusemba.proto.Size#ADAPTER")
    val size: Size,
    /**
    * ex) true / false
    */
    @field:WireField(tag = 4, adapter = "com.squareup.wire.ProtoAdapter#BOOL")
    val isAvailable: Boolean? = null,
    val unknownFields: ByteString = ByteString.EMPTY
    ) : Message(ADAPTER, unknownFields) {
    …
    }
    

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29. data class Coffee(
    /**
    * ex) espresso
    */
    @field:WireField(tag = 1, adapter = "com.squareup.wire.ProtoAdapter#STRING")
    val name: String,
    /**
    * ex) 340
    */
    @field:WireField(tag = 2, adapter = "com.squareup.wire.ProtoAdapter#DOUBLE")
    val price: Double,
    /**
    * ex) small / medium / large
    */
    @field:WireField(tag = 3, adapter = "com.takusemba.proto.Size#ADAPTER")
    val size: Size,
    /**
    * ex) true / false
    */
    @field:WireField(tag = 4, adapter = "com.squareup.wire.ProtoAdapter#BOOL")
    val isAvailable: Boolean? = null,
    val unknownFields: ByteString = ByteString.EMPTY
    ) : Message(ADAPTER, unknownFields) {
    …
    }
    val name: String, // required
    val price: Double, // required
    val size: Size, // required
    val isAvailable: Boolean? = null, // optional
    

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30. https://github.com/takusemba
    https://twitter.com/takusemba
    

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