Extractor Class — spring-boot Architecture

Source Code

core/spring-boot/src/main/java/org/springframework/boot/logging/log4j2/Extractor.java lines 33–65

class Extractor {

	private final @Nullable StackTracePrinter stackTracePrinter;

	Extractor(@Nullable StackTracePrinter stackTracePrinter) {
		this.stackTracePrinter = stackTracePrinter;
	}

	String messageAndStackTrace(LogEvent event) {
		return event.getMessage().getFormattedMessage() + "\n\n" + stackTrace(event);
	}

	@Nullable String stackTrace(LogEvent event) {
		return stackTrace(event.getThrown());
	}

	@Nullable String stackTrace(@Nullable Throwable throwable) {
		if (throwable == null) {
			return null;
		}
		if (this.stackTracePrinter != null) {
			return this.stackTracePrinter.printStackTraceToString(throwable);
		}
		return printStackTrace(throwable);
	}

	private static String printStackTrace(Throwable throwable) {
		StringWriter stringWriter = new StringWriter();
		throwable.printStackTrace(new PrintWriter(stringWriter));
		return stringWriter.toString();
	}

}