public Optional put()

in apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/context/CorrelationContext.java [62:94]

• 23 lines of code
• 8 McCabe index (conditional complexity)

    public Optional<String> put(String key, String value) {
        // key must not null
        if (key == null) {
            return Optional.empty();
        }

        // remove and return previous value when value is empty
        if (StringUtil.isEmpty(value)) {
            return Optional.ofNullable(data.remove(key));
        }

        // check value length
        if (value.length() > Config.Correlation.VALUE_MAX_LENGTH) {
            return Optional.empty();
        }

        // already contain key
        if (data.containsKey(key)) {
            final String previousValue = data.put(key, value);
            return Optional.of(previousValue);
        }

        // check keys count
        if (data.size() >= Config.Correlation.ELEMENT_MAX_NUMBER) {
            return Optional.empty();
        }
        if (AUTO_TAG_KEYS.contains(key) && ContextManager.isActive()) {
            ContextManager.activeSpan().tag(new StringTag(key), value);
        }
        // setting
        data.put(key, value);
        return Optional.empty();
    }