feat(java): decoder add cache

[LiangliangSui]

What does this PR do?

org.apache.fury.meta.Encoders adds cache to decoder and uses hashCode as key.

Related issues

Does this PR introduce any user-facing change?

• Does this PR introduce any public API change?
• Does this PR introduce any binary protocol compatibility change?

Benchmark

[chaokunyang]

Hashcode is an internal optimization, maybe we shouldn't make it pubic as an API for meta string encoder

[chaokunyang]

Hi @LiangliangSui , meta string encoding is not in critical path, we don't need to cache it. And we've alreadly have cache in ClassResolver

[LiangliangSui]

Hi @LiangliangSui , meta string encoding is not in critical path, we don't need to cache it. And we've alreadly have cache in ClassResolver

The meta string encoding cache is already implemented in org.apache.fury.meta.Encoders. I just moved them a bit. Then I implemented the decode cache based on the meta string encoding cache.

[LiangliangSui]

Why is meta string encoding not in the critical path? I see that encoding is cached in Encoders, maybe decoding needs similar optimization?

[chaokunyang]

Why is meta string encoding not in the critical path? I see that encoding is cached in Encoders, maybe decoding needs similar optimization?

It's encoded only once and cached in ClassResolver

[chaokunyang]

Is there a way to add cache for decode and didn't introduce API like hashcode stuff?

[LiangliangSui]

Is there a way to add cache for decode and didn't introduce API like hashcode stuff?

I also thought about what you said, we can only establish an association with String through (byte[] encodedData, Encoding encoding), but the best way to integrate (byte[] encodedData, Encoding encoding) is to use hashcode, and this can also avoid the secondary calculation of (byte[] encodedData, Encoding encoding)

[chaokunyang]

The hashcode should not be added to MetaString API, it's really an internal implementation of class resolution

[LiangliangSui]

Perhaps we can use (byte[] encodedData, Encoding encoding) to construct an incomplete MetaString, and then use MetaString as the key and String as the value.