SpringEnvironmentLookup Class — spring-boot Architecture

Source Code

core/spring-boot/src/main/java/org/springframework/boot/logging/log4j2/SpringEnvironmentLookup.java lines 36–61

@Plugin(name = "spring", category = StrLookup.CATEGORY)
class SpringEnvironmentLookup implements LoggerContextAware, StrLookup {

	private volatile @Nullable Environment environment;

	@Override
	public @Nullable String lookup(LogEvent event, String key) {
		return lookup(key);
	}

	@Override
	public @Nullable String lookup(String key) {
		Environment environment = this.environment;
		Assert.state(environment != null,
				"Unable to obtain Spring Environment from LoggerContext. "
						+ "This can happen if your log4j2 configuration filename does not end with '-spring' "
						+ "(for example using 'log4j2.xml' instead of 'log4j2-spring.xml')");
		return environment.getProperty(key);
	}

	@Override
	public void setLoggerContext(LoggerContext loggerContext) {
		this.environment = Log4J2LoggingSystem.getEnvironment(loggerContext);
	}

}