Simplify Logger API, add shortcut properties for WithLogging

[alexander-yevsyukov]

This PR simplifies the Logger API avoiding the intermediate JvmLogger and Middleman classes that were needed when the real logger had to be façaded under the abstract API which uses io.spine.logging.Level and LoggingDomain.

Implementation details

The Middleman class was renamed to Logger and pushed to the commonMain. The JvmLogger was eliminated.

The Middleman.forEnclosedClass() was removed in favor of already present LoggingFactory.forEnclosedClass() factory function.

Shortcut properties for at<Level> methods of a Logger

The WithLogging interface got atSevere, atInfo, atDebug and the like properties that serve as a shortcut for logger.atSevere() and the like methods. This is for brevity of the logging calls:

atInfo.log { "Warming up..." }

Other notable changes

• Extension functions for the Level classes were moved under LoggerExts.kt file.
• LoggingFactory was reworked to handle ClassValue<Logger> via a nested object instead of using inheritance.

Breaking API change

The Logger class now does not have a generic parameter. So Logger<*> or Logger<?> at the usage sites must be replaced with just Logger.

[codecov]

Codecov Report

❌ Patch coverage is 3.17460% with 61 lines in your changes missing coverage. Please review.
✅ Project coverage is 14.82%. Comparing base (79f4563) to head (5b098b9).
⚠️ Report is 20 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #132      +/-   ##
============================================
+ Coverage     14.59%   14.82%   +0.22%     
  Complexity      147      147              
============================================
  Files           103      102       -1     
  Lines          2733     2691      -42     
  Branches        380      374       -6     
============================================
  Hits            399      399              
+ Misses         2304     2262      -42     
  Partials         30       30              

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[Copilot]

Pull Request Overview

This PR simplifies the Logger API by eliminating intermediate classes and streamlining the logging factory implementation. The main changes consolidate logging functionality into a single Logger class instead of the previous multi-layered approach with JvmLogger and Middleman.

• Removed JvmLogger and Middleman classes in favor of a unified Logger implementation
• Moved the consolidated Logger class to commonMain for broader platform support
• Refactored LoggingFactory to use a nested object pattern for ClassValue<Logger> handling

Reviewed Changes

Copilot reviewed 27 out of 27 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
version.gradle.kts	Version bump to 2.0.0-SNAPSHOT.400
pom.xml	Version update in Maven POM
dependencies.md	Updated dependency report with new version
logging/src/commonMain/kotlin/io/spine/logging/Logger.kt	New unified Logger implementation moved from JVM-specific code
logging/src/commonMain/kotlin/io/spine/logging/LoggingFactory.kt	Updated factory to return non-generic Logger instances
logging/src/commonMain/kotlin/io/spine/logging/WithLogging.kt	Updated interface to use non-generic Logger type
logging/src/jvmMain/kotlin/io/spine/logging/LoggingFactory.kt	Refactored with nested LoggerClassValue object
logging/src/jvmMain/kotlin/io/spine/logging/LevelExts.kt	New file containing Level extension functions
Multiple test files	Updated type references from JvmLogger to Logger
Backend files	Updated import statements to use new Levels class

[Copilot]

Pull Request Overview

Copilot reviewed 28 out of 28 changed files in this pull request and generated 1 comment.

[Copilot]

Pull Request Overview

Copilot reviewed 28 out of 28 changed files in this pull request and generated 2 comments.