Github user bostko commented on the pull request:
https://github.com/apache/brooklyn-server/pull/119#issuecomment-222327645
An example is when you want to provide the HttpFeed with a mutable
UsernameAndPasswordCredentials. When the credentials are changed you should it
is useful to be able to alter the credentials object from code who is aware of
the credentials change. Example
https://github.com/brooklyncentral/brooklyn-ambari/pull/101/files
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