Refactor Log4j2 to use Template Method for system properties

Signed-off-by: hojooo <[email protected]>

Author: hojooo

core/spring-boot/src/main/java/org/springframework/boot/logging/log4j2/Log4J2LoggingSystem.java

@@ -65,8 +65,10 @@
 import org.springframework.boot.logging.LoggingInitializationContext;
 import org.springframework.boot.logging.LoggingSystem;
 import org.springframework.boot.logging.LoggingSystemFactory;
+import org.springframework.boot.logging.LoggingSystemProperties;
 import org.springframework.core.Conventions;
 import org.springframework.core.annotation.Order;
+import org.springframework.core.env.ConfigurableEnvironment;
 import org.springframework.core.env.Environment;
 import org.springframework.core.io.Resource;
 import org.springframework.core.io.ResourceLoader;
@@ -155,6 +157,11 @@ public Log4J2LoggingSystem(ClassLoader classLoader) {
 		super(classLoader);
 	}
 
+	@Override
+	public LoggingSystemProperties getSystemProperties(ConfigurableEnvironment environment) {
+		return new Log4j2LoggingSystemProperties(environment, getDefaultValueResolver(environment), null);
+	}
+
 	@Override
 	protected String[] getStandardConfigLocations() {
 		List<String> locations = new ArrayList<>();
@@ -324,15 +331,10 @@ private void load(LoggingInitializationContext initializationContext, String loc
 		List<String> overrides = getOverrides(initializationContext);
 		Environment environment = initializationContext.getEnvironment();
 		Assert.state(environment != null, "'environment' must not be null");
-		applyLog4j2SystemProperties(environment, logFile);
+		applySystemProperties(environment, logFile);
 		loadConfiguration(location, logFile, overrides);
 	}
 
-
-	private void applyLog4j2SystemProperties(Environment environment, @Nullable LogFile logFile) {
-		new Log4j2LoggingSystemProperties(environment, getDefaultValueResolver(environment), null).apply(logFile);
-	}
-
 	private List<String> getOverrides(LoggingInitializationContext initializationContext) {
 		Environment environment = initializationContext.getEnvironment();
 		Assert.state(environment != null, "'environment' must not be null");