content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.cassandra.v4_0;
  
  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.takesArguments;
  
  import io.opentelemetry.javaagent.extension.instrumentation.TypeInstrumentation;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeTransformer;
  import java.util.concurrent.CompletionStage;
  import net.bytebuddy.asm.Advice;
  import net.bytebuddy.description.type.TypeDescription;
  import net.bytebuddy.matcher.ElementMatcher;
  
  public class SessionBuilderInstrumentation implements TypeInstrumentation {
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      // Note: Cassandra has a large driver and we instrument single class in it.
      // The rest is ignored in AdditionalLibraryIgnoresMatcher
      return named("com.datastax.oss.driver.api.core.session.SessionBuilder");
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          isMethod().and(isPublic()).and(named("buildAsync")).and(takesArguments(0)),
          SessionBuilderInstrumentation.class.getName() + "$BuildAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class BuildAdvice {
  
      /**
       * Strategy: each time we build a connection to a Cassandra cluster, the
       * com.datastax.oss.driver.api.core.session.SessionBuilder.buildAsync() method is called. The
       * opentracing contribution is a simple wrapper, so we just have to wrap the new session.
       *
       * @param stage The fresh CompletionStage to patch. This stage produces session which is
       *     replaced with new session
       */
      @Advice.OnMethodExit(suppress = Throwable.class)
      public static void injectTracingSession(
          @Advice.Return(readOnly = false) CompletionStage<?> stage) {
        stage = stage.thenApply(new CompletionStageFunction());
      }
    }
  }
  