[midPoint-git] [Evolveum/midpoint] bf9835: Make ExpressionFactory thread-safe

[mederly]

  Branch: refs/heads/support-4.0
  Home:   https://github.com/Evolveum/midpoint
  Commit: bf9835b826541bf22c98cd1466796d18838a6134
      https://github.com/Evolveum/midpoint/commit/bf9835b826541bf22c98cd1466796d18838a6134
  Author: Pavol Mederly <mederly at evolveum.com>
  Date:   2020-08-25 (Tue, 25 Aug 2020)

  Changed paths:
    M repo/repo-common/src/main/java/com/evolveum/midpoint/repo/common/expression/ExpressionFactory.java

  Log Message:
  -----------
  Make ExpressionFactory thread-safe

This is an approximate solution to MID-6432.
(100% solution would require immutability of the cache keys.)