RFR: 8229517: Support for optional asynchronous/buffered logging [v17]

[Xin Liu]

> This patch provides a buffer to store asynchrounous messages and flush them to
> underlying files periodically.

Xin Liu has updated the pull request incrementally with one additional commit since the last revision:

  Update according to reviewer's feedback.

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3135/files
  - new: https://git.openjdk.java.net/jdk/pull/3135/files/be83aafd..348edfc0

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3135&range=16
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3135&range=15-16

  Stats: 37 lines in 9 files changed: 1 ins; 13 del; 23 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3135.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3135/head:pull/3135

PR: https://git.openjdk.java.net/jdk/pull/3135