RFR: 8284638: store skip buffers in InputStream Object [v2]

[XenoAmess]

On Tue, 12 Apr 2022 20:39:52 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

> Without specific information about use cases, there isn't enough information to craft a good algorithm/solution and simplicity is preferred. The MAX_SKIP_BUFFER_SIZE is 2048 (not 8192).
> 
> What subclasses of InputStream in the JDK do not override skip(n)? Most sequential streams are open for a relatively short period of time, the lifetime of the memory for the buffer won't change the memory usage enough to notice.
> 
> If the concern is about tying up memory then allocate the buffer once and don't resize it. Each resize consumes extra memory and gc cycles to reclaim the last buffer. Use the requested size but at least nnn and at most MAX_SKIP_BUFFER_SIZE.

@RogerRiggs Sounds reasonable and applied. Should we change the implementation in Reader class as well?

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PR: https://git.openjdk.java.net/jdk/pull/5872