content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.cassandra.v3_0;
  
  import static net.bytebuddy.matcher.ElementMatchers.isMethod;
  import static net.bytebuddy.matcher.ElementMatchers.isPrivate;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.takesArguments;
  
  import com.datastax.driver.core.Session;
  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;
  
  public class CassandraManagerInstrumentation 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.driver.core.Cluster$Manager");
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          isMethod().and(isPrivate()).and(named("newSession")).and(takesArguments(0)),
          this.getClass().getName() + "$NewSessionAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class NewSessionAdvice {
  
      /**
       * Strategy: each time we build a connection to a Cassandra cluster, the
       * com.datastax.driver.core.Cluster$Manager.newSession() method is called. The opentracing
       * contribution is a simple wrapper, so we just have to wrap the new session.
       *
       * @param session The fresh session to patch. This session is replaced with new session
       */
      @Advice.OnMethodExit(suppress = Throwable.class)
      public static void injectTracingSession(@Advice.Return(readOnly = false) Session session) {
        // This should cover ours and OT's TracingSession
        if (session.getClass().getName().endsWith("cassandra.TracingSession")) {
          return;
        }
        session = new TracingSession(session);
      }
    }
  }
  