Examples with SamplingStrategy com.amazonaws.xray.strategy.sampling.SamplingStrategy used on opensource projects

Example 1 with SamplingStrategy

use of com.amazonaws.xray.strategy.sampling.SamplingStrategy in project aws-xray-sdk-java by aws.

the class AWSXRayServletAsyncListener method preFilter.

public Segment preFilter(ServletRequest request, ServletResponse response) {
    Segment created = null;
    HttpServletRequest httpServletRequest = castServletRequest(request);
    if (null == httpServletRequest) {
        logger.warn("Null value for incoming HttpServletRequest. Beginning DummySegment.");
        return recorder.beginDummySegment(new TraceID());
    }
    Optional<TraceHeader> incomingHeader = getTraceHeader(httpServletRequest);
    SamplingStrategy samplingStrategy = recorder.getSamplingStrategy();
    if (logger.isDebugEnabled() && incomingHeader.isPresent()) {
        logger.debug("Incoming trace header received: " + incomingHeader.get().toString());
    }
    SampleDecision sampleDecision = incomingHeader.isPresent() ? incomingHeader.get().getSampled() : fromSamplingStrategy(httpServletRequest);
    if (SampleDecision.REQUESTED.equals(sampleDecision) || SampleDecision.UNKNOWN.equals(sampleDecision)) {
        sampleDecision = fromSamplingStrategy(httpServletRequest);
    }
    TraceID traceId = incomingHeader.isPresent() ? incomingHeader.get().getRootTraceId() : null;
    if (null == traceId) {
        traceId = new TraceID();
    }
    String parentId = incomingHeader.isPresent() ? incomingHeader.get().getParentId() : null;
    if (SampleDecision.SAMPLED.equals(sampleDecision)) {
        created = recorder.beginSegment(getSegmentName(httpServletRequest), traceId, parentId);
    } else {
        // NOT_SAMPLED
        if (samplingStrategy.isForcedSamplingSupported()) {
            created = recorder.beginSegment(getSegmentName(httpServletRequest), traceId, parentId);
            created.setSampled(false);
        } else {
            created = recorder.beginDummySegment(traceId);
        }
    }
    Map<String, Object> requestAttributes = new HashMap<String, Object>();
    requestAttributes.put("url", httpServletRequest.getRequestURL().toString());
    requestAttributes.put("method", httpServletRequest.getMethod());
    Optional<String> userAgent = getUserAgent(httpServletRequest);
    if (userAgent.isPresent()) {
        requestAttributes.put("user_agent", userAgent.get());
    }
    Optional<String> xForwardedFor = getXForwardedFor(httpServletRequest);
    if (xForwardedFor.isPresent()) {
        requestAttributes.put("client_ip", xForwardedFor.get());
        requestAttributes.put("x_forwarded_for", true);
    } else {
        Optional<String> clientIp = getClientIp(httpServletRequest);
        if (clientIp.isPresent()) {
            requestAttributes.put("client_ip", clientIp.get());
        }
    }
    created.putHttp("request", requestAttributes);
    HttpServletResponse httpServletResponse = castServletResponse(response);
    if (null == response) {
        return created;
    }
    TraceHeader responseHeader = null;
    if (incomingHeader.isPresent()) {
        // create a new header, and use the incoming header so we know what to do in regards to sending back the sampling decision.
        responseHeader = new TraceHeader(created.getTraceId());
        if (SampleDecision.REQUESTED == incomingHeader.get().getSampled()) {
            responseHeader.setSampled(created.isSampled() ? SampleDecision.SAMPLED : SampleDecision.NOT_SAMPLED);
        }
    } else {
        // Create a new header, we're the tracing root. We wont return the sampling decision.
        responseHeader = new TraceHeader(created.getTraceId());
    }
    httpServletResponse.addHeader(TraceHeader.HEADER_KEY, responseHeader.toString());
    return created;
}