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https://issues.apache.org/jira/browse/IGNITE-8570?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16647936#comment-16647936
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Pavel Pereslegin commented on IGNITE-8570:
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Task description changed to match current API design.
> Create lighter version of GridStringLogger
> ------------------------------------------
>
> Key: IGNITE-8570
> URL: https://issues.apache.org/jira/browse/IGNITE-8570
> Project: Ignite
> Issue Type: Improvement
> Affects Versions: 2.4
> Reporter: Andrey Kuznetsov
> Assignee: Pavel Pereslegin
> Priority: Major
> Fix For: 2.8
>
>
> _+Problem with current GridStringLogger implementation+_:
> Most usages of {{GridStringLogger}} in test assumes the following scenario.
> First, it is set as a logger for some Ignite node.
> Then, after some activity on that node, log content is searched for some
> predefined strings.
> {{GridStringLogger}} uses {{StringBuilder}} of bounded size internally to
> store log contents, older contents gets dropped on exaustion.
> Thus, changes that add more logging may damage some independent tests that
> use {{GridStringLogger}}.
>
> +_The suggestion for new implementation:_+
> The suggestion is to implement and use another test logger conforming to
> these requirements:
> * It does not accumulate any logs(actually, it will print no logs to
> anywhere)
> * It allows to set the listener that fires when log message matches certain
> regular expression,
> _+Proposed design+_, pseudocode:
> {code:java}
> public class ListeningTestLogger implements IgniteLogger {
> public void registerListener(Consumer<String> lsnr);
> public void unregisterListener(Consumer<String> lsnr);
>
> public void clearListeners();
> }
> {code}
> In 99.9% cases at some point we should validate listener precondition. For
> example, default precondition for {{substring listener}} - "_does log have
> any messages containing such substring?_". So, listener should support
> validation.
> {code:java}
> interface LogListener extends Consumer<String> {
> void check() throws AssertionError;
> }
> {code}
> To simplify creation of common case listeners (substring, regular expression
> and predicate) should be introduced special listener builder.
> +_Sample logger usage_+:
> {code:java}
> ListeningTestLogger log = new ListeningTestLogger(false, super.log);
> // Create listener that should match "hello" (2 times) and "Ignite" (case
> insensitive, at least one time)
> LogListener lsnr =
> LogListener.matches("hello").times(2).andMatches(Pattern.compile(""(?i)ignite")).build();
> log.registerListener(lsnr);
> // ...
> // ...
> // ...
> lsnr.check(); // throws AssertionError if precodition is not met.
> {code}
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