Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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54 lines
2.1 KiB
54 lines
2.1 KiB
# Protocol Buffers - Google's data interchange format |
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Copyright 2008 Google Inc. |
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https://developers.google.com/protocol-buffers/ |
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## Use the Protobuf Java Lite Runtime |
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The Protobuf Java Lite runtime is separated from the main Java runtime because |
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it's designed and implemented with different constraints. In particular, the Java |
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Lite runtime is much smaller which makes it more suitable to be used on Android. |
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In order to achieve maximum performance and code size, we do |
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NOT guarantee API/ABI stability for Java Lite. If this is not acceptable |
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for your use-case, use the full Java runtime instead. Note that |
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the latest version of Java Lite is not compatible with the 3.0.0 version. |
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You can generate Java Lite code for your .proto files: |
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$ protoc --java_out=lite:${OUTPUT_DIR} path/to/your/proto/file |
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The "optimize_for = LITE_RUNTIME" option in the .proto file no longer has any |
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effect on Java code. |
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Include the generated Java files in your project and add a dependency on the |
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protobuf Java Lite runtime. If you are using Maven, include the following: |
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```xml |
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<dependency> |
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<groupId>com.google.protobuf</groupId> |
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<artifactId>protobuf-javalite</artifactId> |
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<version>3.22.3</version> |
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</dependency> |
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``` |
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## R8 rule to make production app builds work |
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The Lite runtime internally uses reflection to avoid generating hashCode/equals/(de)serialization methods. |
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R8 by default obfuscates the field names, which makes the reflection fail causing exceptions of the form |
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`java.lang.RuntimeException: Field {NAME}_ for {CLASS} not found. Known fields are [ {FIELDS} ]` in MessageSchema.java. |
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There are open issues for this on the [protobuf Github project](https://github.com/protocolbuffers/protobuf/issues/6463) and [R8](https://issuetracker.google.com/issues/144631039). |
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Until the issues is resolved you need to add the following line to your `proguard-rules.pro` file inside your project: |
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``` |
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-keep class * extends com.google.protobuf.GeneratedMessageLite { *; } |
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``` |
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## Older versions |
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For the older version of Java Lite (v3.0.0), please refer to: |
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https://github.com/protocolbuffers/protobuf/blob/javalite/java/lite.md
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