[GitHub] 54hechuan opened a new pull request #2480: 优化缓存括展，支持缓存null值

[GitBox <gi...@apache.org>]

54hechuan opened a new pull request #2480: 优化缓存括展，支持缓存null值
URL: https://github.com/apache/incubator-dubbo/pull/2480
 
 
   ## 优化缓存括展，支持缓存null值
   
   当前CacheFilter存在无法缓存null值问题
   
   但是某些rpc接口被设计成可能返回空值（比如跟据用户名查询用户信息接口，如果查询不到，返回null）
   
   
   ## 增加一个内部类包装待缓存的数据
   
   	static class ValueWrapper {
   		private final Object value;
       	public ValueWrapper(Object value){
       		this.value = value;
       	}
       	public Object get() {
       		return this.value;
       	}
       }
   
   ## Verifying this change
   
   XXXXX
   
   Follow this checklist to help us incorporate your contribution quickly and easily:
   
   - [x] Make sure there is a [GITHUB_issue](https://github.com/apache/incubator-dubbo/issues) filed for the change (usually before you start working on it). Trivial changes like typos do not require a GITHUB issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
   - [ ] Format the pull request title like `[Dubbo-XXX] Fix UnknownException when host config not exist #XXX`. Each commit in the pull request should have a meaningful subject line and body.
   - [ ] Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
   - [ ] 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/incubator-dubbo/tree/master/dubbo-test).
   - [ ] Run `mvn clean install -DskipTests` & `mvn clean test-compile failsafe:integration-test` to make sure unit-test and integration-test pass.
   - [ ] If this contribution is large, please follow the [Software Donation Guide](https://github.com/apache/incubator-dubbo/wiki/Software-donation-guide).
   

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