log4j-samples-loggerProperties/src/main/java/org/apache/logging/log4j/lookup/CustomLookup.java [37:51]:
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    private static final Logger LOGGER = StatusLogger.getLogger();
    private static final Marker LOOKUP = MarkerManager.getMarker("LOOKUP");

    private static ConcurrentMap<String, Map<String, String>> loggerProperties = new ConcurrentHashMap<>();

    /**
     * Looks up the value for the key using the data in the LogEvent.
     * @param event The current LogEvent.
     * @param key  the key to be looked up, may be null
     * @return The value associated with the key.
     */
    @Override
    public String lookup(final LogEvent event, final String key) {
        if (event == null) {
            return null;
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log4j-samples-loggerProperties/src/main/java/org/apache/logging/log4j/lookup/MapMessageLookup.java [39:53]:
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    private static final Logger LOGGER = StatusLogger.getLogger();
    private static final Marker LOOKUP = MarkerManager.getMarker("LOOKUP");

    private static ConcurrentMap<String, Map<String, String>> loggerProperties = new ConcurrentHashMap<>();

    /**
     * Looks up the value for the key using the data in the LogEvent.
     * @param event The current LogEvent.
     * @param key  the key to be looked up, may be null
     * @return The value associated with the key.
     */
    @Override
    public String lookup(final LogEvent event, final String key) {
        if (event == null) {
            return null;
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