content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.opentelemetryapi;
  
  import static java.util.logging.Level.WARNING;
  import static net.bytebuddy.matcher.ElementMatchers.isMethod;
  import static net.bytebuddy.matcher.ElementMatchers.isStatic;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.returns;
  import static net.bytebuddy.matcher.ElementMatchers.takesArgument;
  import static net.bytebuddy.matcher.ElementMatchers.takesArguments;
  
  import io.opentelemetry.javaagent.extension.instrumentation.TypeInstrumentation;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeTransformer;
  import java.util.logging.Logger;
  import net.bytebuddy.asm.Advice;
  import net.bytebuddy.description.type.TypeDescription;
  import net.bytebuddy.matcher.ElementMatcher;
  
  // Our convention for accessing agent package
  @SuppressWarnings("UnnecessarilyFullyQualified")
  public class OpenTelemetryInstrumentation implements TypeInstrumentation {
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return named("application.io.opentelemetry.api.GlobalOpenTelemetry");
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          isMethod()
              .and(isStatic())
              .and(named("get"))
              .and(takesArguments(0))
              .and(returns(named("application.io.opentelemetry.api.OpenTelemetry"))),
          OpenTelemetryInstrumentation.class.getName() + "$GetAdvice");
      transformer.applyAdviceToMethod(
          isMethod()
              .and(isStatic())
              .and(named("set"))
              .and(takesArguments(1))
              .and(takesArgument(0, named("application.io.opentelemetry.api.OpenTelemetry"))),
          OpenTelemetryInstrumentation.class.getName() + "$SetAdvice");
      transformer.applyAdviceToMethod(
          isMethod().and(isStatic()).and(named("resetForTest")).and(takesArguments(0)),
          OpenTelemetryInstrumentation.class.getName() + "$ResetForTestAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class GetAdvice {
  
      @Advice.OnMethodEnter(skipOn = Advice.OnDefaultValue.class)
      public static Object onEnter() {
        return null;
      }
  
      @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
      public static void methodExit(
          @Advice.Return(readOnly = false)
              application.io.opentelemetry.api.OpenTelemetry openTelemetry) {
        openTelemetry = ApplicationOpenTelemetry.INSTANCE;
      }
    }
  
    @SuppressWarnings("unused")
    public static class SetAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void onEnter() {
        Logger.getLogger(application.io.opentelemetry.api.GlobalOpenTelemetry.class.getName())
            .log(
                WARNING,
                "You are currently using the OpenTelemetry Instrumentation Java Agent;"
                    + " all GlobalOpenTelemetry.set calls are ignored - the agent provides"
                    + " the global OpenTelemetry object used by your application.",
                new Throwable());
      }
    }
  
    @SuppressWarnings("unused")
    public static class ResetForTestAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void onEnter() {
        Logger.getLogger(application.io.opentelemetry.api.GlobalOpenTelemetry.class.getName())
            .log(
                WARNING,
                "You are currently using the OpenTelemetry Instrumentation Java Agent;"
                    + " all GlobalOpenTelemetry.resetForTest calls are ignored - the agent provides"
                    + " the global OpenTelemetry object used by your application.",
                new Throwable());
      }
    }
  }
  