java 将 BigDecimal/BigInteger 序列化为 ProtocolBuffers 的最佳方法是什么
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What is the best approach for serializing BigDecimal/BigInteger to ProtocolBuffers
提问by Rich
I am starting to migrate a custom serialization mechanism to Protocol Buffers. One data type that will be used particularly regularly is BigDecimal.
我开始将自定义序列化机制迁移到 Protocol Buffers。将特别经常使用的一种数据类型是BigDecimal.
Does anyone know of a good way of serializing this within Protocol Buffers? Our current serialization routine uses BigDecimal.toPlainString()for serialization, and new BigDecimal(String)for deserialization - I'm assuming there's a better way.
有谁知道在 Protocol Buffers 中序列化这个的好方法吗？我们当前的序列化例程BigDecimal.toPlainString()用于序列化和new BigDecimal(String)反序列化 - 我假设有更好的方法。
My guess is to define a BigDecimalas:
我的猜测是将 a 定义BigDecimal为：
message BDecimal {
required int32 scale = 1;
required BInteger int_val = 2;
}
But I am not too sure how to define BigInteger- perhaps using its toByteArray()method?
但我不太确定如何定义BigInteger- 也许使用它的toByteArray()方法？
采纳答案by notnoop
Yes. You should define BigInteger as BigInteger.toByteArray() .
是的。您应该将 BigInteger 定义为 BigInteger.toByteArray() 。
My guess is that BigDecimal would be:
我的猜测是 BigDecimal 将是：
message BDecimal {
required int32 scale = 1;
required BInteger int_val = 2;
}
while BigInteger may be defined as
而 BigInteger 可以定义为
message BInteger {
required bytes value = 1;
}
The code to handle BigInteger would be:
处理 BigInteger 的代码是：
BInteger write(BigInteger val) {
BInteger.Builder builder = BInteger.newBuilder();
ByteString bytes = ByteString.copyFrom(val.toByteArray());
builder.setValue(bytes);
return builder.build();
}
BigInteger read(BInteger message) {
ByteString bytes = message.getValue();
return new BigInteger(bytes.toByteArray());
}
回答by squiddle
Why do you want to change it? Just because you can or is there a real need (like a profiling session confirming, that serialization/deserialization takes most of the time).
你为什么要改变它？仅仅因为您可以或是否确实需要（例如确认分析会话，序列化/反序列化需要大部分时间）。
I would use a string, just because it is built in :)
我会使用一个字符串，只是因为它是内置的:)
The proposed byte array approach (What is the best approach for serializing BigDecimal/BigInteger to ProtocolBuffers) seems fine to me, if string representation seems to be an issue.
如果字符串表示似乎是一个问题，那么建议的字节数组方法（将 BigDecimal/BigInteger 序列化为 ProtocolBuffers 的最佳方法是什么）对我来说似乎很好。
