Xiaochao Li

In production env, the log level is `INFO` usually. But in current code, each log message is computed when executing the code line even though the set log level is...

By require the 'singleton-client', all the needed files should be ready. One best proctice is to load files under a directory through a file. So no files are missed.

Now our gem name is `singleton-client` instead of `singleton-ruby`. So need to change `singleton-ruby` to `singleton-client`.

**Describe the bug** The is a requirement to set configuration items separately rather than loading all configuraitons through a file Current configuration code is complex with unnecessary code. Cleaning code...

In current code, multiple threads will be started when cache is expired. It should have only one backgroud thread to update a bundle.

When running tests through command `rspec` in my local env, the coverage is 89.84% for [PR1699](https://github.com/vmware/singleton/pull/1699) . But in CI result, it is 63.54%. **Expected behavior** The coverage data should...

Available locales should be quired by component because different components may have different available locales. Fox example, a bundle, which only has source, has only source locale. Add a parameter...