fi.evolver.utils.attribute.Slf4jMdcAttribute Maven / Gradle / Ivy

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Generic Evolver utility classes

There is a newer version: 3.5.0

package fi.evolver.utils.attribute;

import fi.evolver.utils.ContextUtils;
import org.slf4j.MDC;

import java.util.Optional;


/**
 * A helper class for setting and accessing Slf4j MDC attributes.
 *
 * Note! the attribute life cycle and thread migration are handled by the current context.
 */
public class Slf4jMdcAttribute implements ContextRegistrableAttribute {
	private final String name;

	public Slf4jMdcAttribute(String name) {
		this.name = name;
	}


	@Override
	public String name() {
		return name;
	}


	@Override
	public Optional get() {
		return Optional.ofNullable(MDC.get(name()));
	}


	@Override
	public void set(String value) {
		if (value != null) {
			MDC.put(name(), value);
			ContextUtils.register(this);
		}
		else {
			MDC.remove(name());
		}
	}


	@Override
	public String toString() {
		return name;
	}

	@Override
	public Class type() {
		return String.class;
	}
}