xdocs: Fix a race condition in generating the temporary file name

TimeUtil.nowTs() has only millisecond resolution, so calling getNanos() on
it does not add any precision. With millisecond resolution it can happen
for a side-by-side diff that the same temporary file name is created for
the two files to compare, resulting in an exception like

java.io.FileNotFoundException: [...]/xdocs/tmp/asciidoctor-891000000.tmp
(No such file or directory)
    at com.google.common.cache.AbstractLoadingCache.getUnchecked(AbstractLoadingCache.java:55)
    at com.googlesource.gerrit.plugins.xdocs.XDocCache.get(XDocCache.java:52)
    at com.googlesource.gerrit.plugins.xdocs.XDocWebLink.getFileUrl(XDocWebLink.java:123)
    at com.googlesource.gerrit.plugins.xdocs.XDocWebLink.getFileWebLink(XDocWebLink.java:92)

Fix this by letting Java determine a unique file name via
File.createTempFile() and let AsciiDoctor simply overwrite it.

Change-Id: Icf3843f8cd8c4c6f4ae10b3a8b264f2e52b72f89
1 file changed
tree: b94624e2cb2c8d151129acbe5c4f1195657f3460
  1. .settings/
  2. lib/
  3. src/
  4. .buckconfig
  5. .gitignore
  6. BUCK
  8. pom.xml