[jira] [Created] (FLINK-17331) Add NettyMessageContent interface for all the class which could be write to NettyMessage

[Shang Yuanchun (Jira)]

Yangze Guo created FLINK-17331:
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             Summary: Add NettyMessageContent interface for all the class which could be write to NettyMessage
                 Key: FLINK-17331
                 URL: https://issues.apache.org/jira/browse/FLINK-17331
             Project: Flink
          Issue Type: Improvement
            Reporter: Yangze Guo


Currently, there are some classes, e.g. {{JobVertexID}}, {{ExecutionAttemptID}} need to write to {{NettyMessage}}. However, the size of these classes in {{ByteBuf}} are directly written in {{NettyMessage}} class, which is error-prone. If someone edits those classes, there would be no warning or error during the compile phase. I think it would be better to add a {{NettyMessageContent}}(the name could be discussed) interface:
{code:java}
public interface NettyMessageContent {
    void writeTo(ByteBuf bug)
    int getContentLen();
}
{code}

Regarding the {{fromByteBuf}}, since it is a static method, we could not add it to the interface. We might explain it in the javaDoc of {{NettyMessageContent}}.



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