RFR: 8259956: jdk.jfr.internal.ChunkInputStream#available should return the sum of remaining available bytes

[Denghui Dong]

On Mon, 1 Feb 2021 19:55:09 GMT, Erik Gahlin <egahlin at openjdk.org> wrote:

> There is a method for finding the size of a recording, Recording::getSize(). It returns a long, which means it will work in cases where the recording is larger than 2 GB. I would recommend using it if you want to know the size in a reliable way.
> 

But if I get the data of a period of time in the past through Recoding::getStream, I cannot know its size.


> One problem with the implementation is that you iterate over all chunks with every call to available(). It would be nice to avoid this.

I used "unstreamedSize" to cache the size.

> I also wonder if you considered making total a long value and check for overflow once and near the return statement?

yes, good idea!

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PR: https://git.openjdk.java.net/jdk/pull/2138