10000 Do not inspect reactor context when not needed by amarziali · Pull Request #8745 · DataDog/dd-trace-java · GitHub
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Do not inspect reactor context when not needed #8745

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Merged
merged 1 commit into from
Apr 29, 2025
Merged

Do not inspect reactor context when not needed #8745

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Do not inspect reactor context when not needed
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@amarziali
amarziali committed Apr 28, 2025
commit cdc63bd13060d909ad05f844ad0f23736680ba59
23 changes: 22 additions & 1 deletion ...-core-3.1/src/main/java/datadog/trace/instrumentation/reactor/core/ContextSpanHelper.java
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Expand Up @@ -4,16 +4,37 @@
import datadog.trace.bootstrap.instrumentation.api.WithAgentSpan;
import javax.annotation.Nullable;
import reactor.core.CoreSubscriber;
import reactor.core.publisher.Mono;
import reactor.util.context.Context;

public class ContextSpanHelper {

private static final Class<?> MONO_WITH_CONTEXT_CLASS = findMonoWithContextClass();

private static final String DD_SPAN_KEY = "dd.span";

private static Class<?> findMonoWithContextClass() {
final ClassLoader classLoader = Mono.class.getClassLoader();
// 3.4+
try {
return Class.forName(
"reactor.core.publisher.FluxContextWrite$ContextWriteSubscriber", false, classLoader);
} catch (Throwable ignored) {
}
// < 3.4
try {
return Class.forName(
"reactor.core.publisher.FluxContextStart$ContextStartSubscriber", false, classLoader);
} catch (Throwable ignored) {
}
return null;
}

private ContextSpanHelper() {}

@Nullable
public static AgentSpan extractSpanFromSubscriberContext(final CoreSubscriber<?> subscriber) {
if (subscriber == null) {
if (MONO_WITH_CONTEXT_CLASS == null || !MONO_WITH_CONTEXT_CLASS.isInstance(subscriber)) {
return null;
}
Context context = null;
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