content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.mongo.v3_1;
  
  import static java.util.Collections.singletonList;
  import static net.bytebuddy.matcher.ElementMatchers.declaresMethod;
  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.takesArgument;
  import static net.bytebuddy.matcher.ElementMatchers.takesArguments;
  
  import com.google.auto.service.AutoService;
  import com.mongodb.MongoClientOptions;
  import com.mongodb.event.CommandListener;
  import io.opentelemetry.javaagent.extension.instrumentation.InstrumentationModule;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeInstrumentation;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeTransformer;
  import java.util.List;
  import net.bytebuddy.asm.Advice;
  import net.bytebuddy.description.type.TypeDescription;
  import net.bytebuddy.matcher.ElementMatcher;
  
  @AutoService(InstrumentationModule.class)
  public class MongoClientInstrumentationModule extends InstrumentationModule {
  
    public MongoClientInstrumentationModule() {
      super("mongo", "mongo-3.1");
    }
  
    @Override
    public List<TypeInstrumentation> typeInstrumentations() {
      return singletonList(new MongoClientOptionsBuilderInstrumentation());
    }
  
    private static final class MongoClientOptionsBuilderInstrumentation
        implements TypeInstrumentation {
      @Override
      public ElementMatcher<TypeDescription> typeMatcher() {
        return named("com.mongodb.MongoClientOptions$Builder")
            .and(
                declaresMethod(
                    named("addCommandListener")
                        .and(isPublic())
                        .and(
                            takesArguments(1)
                                .and(takesArgument(0, named("com.mongodb.event.CommandListener"))))));
      }
  
      @Override
      public void transform(TypeTransformer transformer) {
        transformer.applyAdviceToMethod(
            isMethod().and(isPublic()).and(named("build")).and(takesArguments(0)),
            MongoClientInstrumentationModule.class.getName() + "$MongoClientAdvice");
      }
    }
  
    @SuppressWarnings("unused")
    public static class MongoClientAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void injectTraceListener(
          @Advice.This MongoClientOptions.Builder builder,
          @Advice.FieldValue("commandListeners") List<CommandListener> commandListeners) {
        for (CommandListener commandListener : commandListeners) {
          if (MongoInstrumentationSingletons.isTracingListener(commandListener)) {
            return;
          }
        }
        builder.addCommandListener(MongoInstrumentationSingletons.LISTENER);
      }
    }
  }
  