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There is a newer version: 2.1.0-alpha1

package org.slf4j.spi;

import java.util.function.Supplier;

import org.slf4j.Marker;

/**
 * A no-operation implementation of {@link LoggingEventBuilder}. 
 * As the name indicates, this implementation does nothing or alternatively returns
 * a singleton, i.e. the unique instance of this class.
 * 
 * @author Ceki Gülcü
 * @since 2.0.0
 *
 */
public class NOPLoggingEventBuilder implements LoggingEventBuilder {

    static final NOPLoggingEventBuilder SINGLETON = new NOPLoggingEventBuilder();

    
    private NOPLoggingEventBuilder() {
    }
    
    public static LoggingEventBuilder singleton() {
        return SINGLETON;
    }

    @Override
    public LoggingEventBuilder addMarker(Marker marker) {
        return singleton();
    }

    @Override
    public LoggingEventBuilder addArgument(Object p) {
        return singleton();
    }

    @Override
    public LoggingEventBuilder addArgument(Supplier objectSupplier) {
        return singleton();
    }

    @Override
    public LoggingEventBuilder addKeyValue(String key, Object value) {
        return singleton();
    }

    @Override
    public LoggingEventBuilder addKeyValue(String key, Supplier