Patson Luk created SOLR-16696:
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Summary: Add Breakpoint injection for CommonTestInjection
Key: SOLR-16696
URL: https://issues.apache.org/jira/browse/SOLR-16696
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Components: SolrCloud
Reporter: Patson Luk
While writing test cases to verify our fix on a race condition, we used
`CommonTestInjection` to inject artificial delay to trigger the race condition.
However, it's argued that using arbitrary delay to force such condition might
not be the most reliable in our case as in certain edge timing condition, the
test might not be creating the expected code execution order.
Therefore, we are proposing an extra injection feature in `CommonTestInjection`
(PR to follow) that injects a "breakpoint" to hold off certain code execution
until certain condition/piece of code is executed:
1. In the code that is susceptible to race condition, we can call `assert
CommonTestInjection#injectBreakpoint(String)` which would hold and execute the
code defined (see point 2) for such breakpoint IFF assertion is turned on (for
unit testing etc). The string here refers to a "Breakpoint key", which could
simply be a class name or something more specific.
2. In the unit test case, set the breakpoint using
CommonTestInjection#setBreakpoint(String, Breakpoint), Breakpoint is a new
interface with a single method void executeAndResume() - Code execution should
break at where the breakpoint was injected, then it would execute this method
and resumes the execution afterwards
With the above in place, then we can more precisely trigger race condition or
even verify caught exception did get triggered as expected. (more details in
the PR)
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