Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
54 lines
2.1 KiB
54 lines
2.1 KiB
# Protocol Buffers - Google's data interchange format |
|
|
|
Copyright 2008 Google Inc. |
|
|
|
https://developers.google.com/protocol-buffers/ |
|
|
|
## Use the Protobuf Java Lite Runtime |
|
|
|
The Protobuf Java Lite runtime is separated from the main Java runtime because |
|
it's designed and implemented with different constraints. In particular, the Java |
|
Lite runtime is much smaller which makes it more suitable to be used on Android. |
|
|
|
In order to achieve maximum performance and code size, we do |
|
NOT guarantee API/ABI stability for Java Lite. If this is not acceptable |
|
for your use-case, use the full Java runtime instead. Note that |
|
the latest version of Java Lite is not compatible with the 3.0.0 version. |
|
|
|
You can generate Java Lite code for your .proto files: |
|
|
|
$ protoc --java_out=lite:${OUTPUT_DIR} path/to/your/proto/file |
|
|
|
The "optimize_for = LITE_RUNTIME" option in the .proto file no longer has any |
|
effect on Java code. |
|
|
|
Include the generated Java files in your project and add a dependency on the |
|
protobuf Java Lite runtime. If you are using Maven, include the following: |
|
|
|
```xml |
|
<dependency> |
|
<groupId>com.google.protobuf</groupId> |
|
<artifactId>protobuf-javalite</artifactId> |
|
<version>3.23.0-rc-1</version> |
|
</dependency> |
|
``` |
|
|
|
## R8 rule to make production app builds work |
|
|
|
The Lite runtime internally uses reflection to avoid generating hashCode/equals/(de)serialization methods. |
|
R8 by default obfuscates the field names, which makes the reflection fail causing exceptions of the form |
|
`java.lang.RuntimeException: Field {NAME}_ for {CLASS} not found. Known fields are [ {FIELDS} ]` in MessageSchema.java. |
|
|
|
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). |
|
|
|
Until the issues is resolved you need to add the following line to your `proguard-rules.pro` file inside your project: |
|
|
|
``` |
|
-keep class * extends com.google.protobuf.GeneratedMessageLite { *; } |
|
``` |
|
|
|
## Older versions |
|
|
|
For the older version of Java Lite (v3.0.0), please refer to: |
|
|
|
https://github.com/protocolbuffers/protobuf/blob/javalite/java/lite.md
|
|
|