content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.couchbase.v2_0;
  
  import static io.opentelemetry.javaagent.instrumentation.couchbase.v2_0.CouchbaseSingletons.instrumenter;
  import static net.bytebuddy.matcher.ElementMatchers.isMethod;
  import static net.bytebuddy.matcher.ElementMatchers.isPublic;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.namedOneOf;
  import static net.bytebuddy.matcher.ElementMatchers.not;
  import static net.bytebuddy.matcher.ElementMatchers.returns;
  
  import com.couchbase.client.java.CouchbaseCluster;
  import io.opentelemetry.instrumentation.rxjava.v1_0.TracedOnSubscribe;
  import io.opentelemetry.javaagent.bootstrap.CallDepth;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeInstrumentation;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeTransformer;
  import net.bytebuddy.asm.Advice;
  import net.bytebuddy.description.type.TypeDescription;
  import net.bytebuddy.matcher.ElementMatcher;
  import rx.Observable;
  
  public class CouchbaseClusterInstrumentation implements TypeInstrumentation {
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return namedOneOf(
          "com.couchbase.client.java.cluster.DefaultAsyncClusterManager",
          "com.couchbase.client.java.CouchbaseAsyncCluster");
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          isMethod().and(isPublic()).and(returns(named("rx.Observable"))).and(not(named("core"))),
          CouchbaseClusterInstrumentation.class.getName() + "$CouchbaseClientAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class CouchbaseClientAdvice {
  
      @Advice.OnMethodEnter
      public static void trackCallDepth(@Advice.Local("otelCallDepth") CallDepth callDepth) {
        callDepth = CallDepth.forClass(CouchbaseCluster.class);
        callDepth.getAndIncrement();
      }
  
      @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
      public static void subscribeResult(
          @Advice.Origin("#t") Class<?> declaringClass,
          @Advice.Origin("#m") String methodName,
          @Advice.Return(readOnly = false) Observable<?> result,
          @Advice.Local("otelCallDepth") CallDepth callDepth) {
        if (callDepth.decrementAndGet() > 0) {
          return;
        }
  
        CouchbaseRequestInfo request = CouchbaseRequestInfo.create(null, declaringClass, methodName);
        result = Observable.create(new TracedOnSubscribe<>(result, instrumenter(), request));
      }
    }
  }
  