RFR: JDK-8002152: javadoc could write out files on a worker thread [v3]

[Pavel Rappo]

On Tue, 16 Mar 2021 05:23:31 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

> > I think we should consider alternative routes of improving performance. For instance, could NIO both speed up I/O and simplify code?
> 
> I don't understand the NIO comment. Under the covers, JavaFileManager uses NIO and has for some time.

Indeed, `JavacFileManager` and friends seem to already use NIO in some places. Perhaps we could improve those parts of JavaDoc that copy files in read-write loops: `DocFile.copyFile(...)` and `DocFile.copyResource(...)`. When no transformation is required, files can be copied using bigger NIO blocks such as `java.nio.file.Files.copy(...)`.

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PR: https://git.openjdk.java.net/jdk/pull/2665