[jira] [Created] (SCB-638) create mechanism for read config item by priority

["wujimin (JIRA)" <ji...@apache.org>]

wujimin created SCB-638:
---------------------------

             Summary: create mechanism for read config item by priority 
                 Key: SCB-638
                 URL: https://issues.apache.org/jira/browse/SCB-638
             Project: Apache ServiceComb
          Issue Type: Task
          Components: Java-Chassis
            Reporter: wujimin
            Assignee: wujimin


currently, we have so many config item need to read by priority.

1.read operation level

2.if operation level not exist, then read schema level

3.if schema level not exist, then read microservice level

4.if microservice level not exist, then read global level  (only for consumer)

 

everyone repeated the logic, and try all the level for every invocation

we can provide a mechanism to handle this logic, eg:

 
{code:java}
class XxxConfig{
  @Config(prefix="servicecomb.request.time")
  private int timeout;
......
}

OperationMeta.extData changed from ConcurrentHashMap to ConcurrentHashMapEx
XxxConfig config = operationMeta.getExtData().computeIfAbsent("...", k->ConfigFactory.create(operationMeta));
config.getTimeout()           // this is what we want. all try logic is triggered by config change callback, not run for every invocation.{code}



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