lindzh opened a new pull request #224: [ROCKETMQ-367] Add logging component. URL: https://github.com/apache/rocketmq/pull/224 ## What is the purpose of the change As logging is widely used in rocketmq such as in broker ,nameserver, client and slf4j is used as default logging module. In some cases, we want to use other logging system not slf4j, we have to merge log config file to use slf4j. In my opinion, a logging module is needed in this case. ## Brief changelog 1. Add InternalLogger use rocketmq innser usage and default logging system is slf4j. 2. Add inner logging system for client usage. 3. Add unit test for each component. ## Verifying this change This is a fully unit test driven PR. Follow this checklist to help us incorporate your contribution quickly and easily: - [x] Make sure there is a [JIRA issue](https://issues.apache.org/jira/projects/ROCKETMQ/issues/) filed for the change (usually before you start working on it). Trivial changes like typos do not require a JIRA issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue. - [x] Format the pull request title like `[ROCKETMQ-XXX] Fix UnknownException when host config not exist`. Each commit in the pull request should have a meaningful subject line and body. - [x] Write a pull request description that is detailed enough to understand what the pull request does, how, and why. - [x] Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add integration-test in [test module](https://github.com/apache/rocketmq/tree/master/test). - [x] Run `mvn -B clean apache-rat:check findbugs:findbugs checkstyle:checkstyle` to make sure basic checks pass. Run `mvn clean install -DskipITs` to make sure unit-test pass. Run `mvn clean test-compile failsafe:integration-test` to make sure integration-test pass. - [x] If this contribution is large, please file an [Apache Individual Contributor License Agreement](http://www.apache.org/licenses/#clas).
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