boolean match()

in aws-xray-recorder-sdk-core/src/main/java/com/amazonaws/xray/strategy/sampling/rule/Matchers.java [48:73]

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

    boolean match(SamplingRequest req) {
        // Comparing against the full list of matchers can be expensive. We try to short-circuit the req as quickly
        // as possible by comparing against matchers with high variance and moving down to matchers that are almost
        // always "*".
        Map<String, String> requestAttributes = req.getAttributes();

        // Ensure that each defined attribute in the sampling rule is satisfied by the request. It is okay for the
        // request to have attributes with no corresponding match in the sampling rule.
        for (Map.Entry<String, String> a : attributes.entrySet()) {
            if (!requestAttributes.containsKey(a.getKey())) {
                return false;
            }

            if (!SearchPattern.wildcardMatch(a.getValue(), requestAttributes.get(a.getKey()))) {
                return false;
            }
        }

        // Missing string parameters from the sampling request are replaced with ""s to ensure they match against *
        // matchers.
        return SearchPattern.wildcardMatch(url, req.getUrl().orElse(""))
                && SearchPattern.wildcardMatch(service, req.getService().orElse(""))
                && SearchPattern.wildcardMatch(method, req.getMethod().orElse(""))
                && SearchPattern.wildcardMatch(host, req.getHost().orElse(""))
                && SearchPattern.wildcardMatch(serviceType, req.getServiceType().orElse(""));
    }