content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.netty.v3_8;
  
  import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.hasClassesNamed;
  import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.implementsInterface;
  import static net.bytebuddy.matcher.ElementMatchers.isMethod;
  import static net.bytebuddy.matcher.ElementMatchers.nameStartsWith;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.takesArgument;
  
  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 org.jboss.netty.channel.ChannelHandler;
  import org.jboss.netty.channel.ChannelPipeline;
  
  public class NettyChannelPipelineInstrumentation implements TypeInstrumentation {
  
    @Override
    public ElementMatcher<ClassLoader> classLoaderOptimization() {
      return hasClassesNamed("org.jboss.netty.channel.ChannelPipeline");
    }
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return implementsInterface(named("org.jboss.netty.channel.ChannelPipeline"));
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          isMethod()
              .and(nameStartsWith("add"))
              .and(takesArgument(1, named("org.jboss.netty.channel.ChannelHandler"))),
          NettyChannelPipelineInstrumentation.class.getName() + "$ChannelPipelineAdd2ArgsAdvice");
      transformer.applyAdviceToMethod(
          isMethod()
              .and(nameStartsWith("add"))
              .and(takesArgument(2, named("org.jboss.netty.channel.ChannelHandler"))),
          NettyChannelPipelineInstrumentation.class.getName() + "$ChannelPipelineAdd3ArgsAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class ChannelPipelineAdd2ArgsAdvice {
  
      @Advice.OnMethodEnter
      public static CallDepth checkDepth(
          @Advice.This ChannelPipeline pipeline, @Advice.Argument(1) ChannelHandler handler) {
        // Pipelines are created once as a factory and then copied multiple times using the same add
        // methods as we are hooking. If our handler has already been added we need to remove it so we
        // don't end up with duplicates (this throws an exception)
        if (pipeline.get(handler.getClass().getName()) != null) {
          pipeline.remove(handler.getClass().getName());
        }
        CallDepth callDepth = CallDepth.forClass(ChannelPipeline.class);
        callDepth.getAndIncrement();
        return callDepth;
      }
  
      @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
      public static void addHandler(
          @Advice.This ChannelPipeline pipeline,
          @Advice.Argument(1) ChannelHandler handler,
          @Advice.Enter CallDepth callDepth) {
  
        if (callDepth.decrementAndGet() > 0) {
          return;
        }
  
        ChannelPipelineUtil.wrapHandler(pipeline, handler);
      }
    }
  
    @SuppressWarnings("unused")
    public static class ChannelPipelineAdd3ArgsAdvice {
  
      @Advice.OnMethodEnter
      public static CallDepth checkDepth(
          @Advice.This ChannelPipeline pipeline, @Advice.Argument(2) ChannelHandler handler) {
        // Pipelines are created once as a factory and then copied multiple times using the same add
        // methods as we are hooking. If our handler has already been added we need to remove it so we
        // don't end up with duplicates (this throws an exception)
        if (pipeline.get(handler.getClass().getName()) != null) {
          pipeline.remove(handler.getClass().getName());
        }
        CallDepth callDepth = CallDepth.forClass(ChannelPipeline.class);
        callDepth.getAndIncrement();
        return callDepth;
      }
  
      @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
      public static void addHandler(
          @Advice.This ChannelPipeline pipeline,
          @Advice.Argument(2) ChannelHandler handler,
          @Advice.Enter CallDepth callDepth) {
  
        if (callDepth.decrementAndGet() > 0) {
          return;
        }
        ChannelPipelineUtil.wrapHandler(pipeline, handler);
      }
    }
  }
  