RFR: 8284638: store skip buffers in InputStream Object

[liach]

On Mon, 11 Apr 2022 22:31:01 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> Even so, it does appear that prior buffer allocations could be "lost" due to concurrent use of skip resulting in a "minor" memory leak in the heap.

The minor leak, though maybe somewhat wasteful, is the necessary cost for thread safety as opposed to locking or synchronizing to reliably retrieve a previously allocated array from another thread.

Another concern about this change is that now the skip buffer is no longer immediately GC'd when exiting the scope but will live on till the input stream is no longer reachable. For instance, if an input stream is skipped and then kept for long, this may be a performance regression instead for the increased memory use.

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