content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.netty.v3_8;
  
  import io.opentelemetry.javaagent.instrumentation.netty.v3_8.client.HttpClientRequestTracingHandler;
  import io.opentelemetry.javaagent.instrumentation.netty.v3_8.client.HttpClientResponseTracingHandler;
  import io.opentelemetry.javaagent.instrumentation.netty.v3_8.client.HttpClientTracingHandler;
  import io.opentelemetry.javaagent.instrumentation.netty.v3_8.server.HttpServerRequestTracingHandler;
  import io.opentelemetry.javaagent.instrumentation.netty.v3_8.server.HttpServerResponseTracingHandler;
  import io.opentelemetry.javaagent.instrumentation.netty.v3_8.server.HttpServerTracingHandler;
  import org.jboss.netty.channel.ChannelHandler;
  import org.jboss.netty.channel.ChannelPipeline;
  import org.jboss.netty.handler.codec.http.HttpClientCodec;
  import org.jboss.netty.handler.codec.http.HttpRequestDecoder;
  import org.jboss.netty.handler.codec.http.HttpRequestEncoder;
  import org.jboss.netty.handler.codec.http.HttpResponseDecoder;
  import org.jboss.netty.handler.codec.http.HttpResponseEncoder;
  import org.jboss.netty.handler.codec.http.HttpServerCodec;
  
  /**
   * When certain handlers are added to the pipeline, we want to add our corresponding tracing
   * handlers. If those handlers are later removed, we may want to remove our handlers. That is not
   * currently implemented.
   */
  public final class ChannelPipelineUtil {
  
    public static void wrapHandler(ChannelPipeline pipeline, ChannelHandler handler) {
      // Server pipeline handlers
      if (handler instanceof HttpServerCodec) {
        pipeline.addLast(HttpServerTracingHandler.class.getName(), new HttpServerTracingHandler());
      } else if (handler instanceof HttpRequestDecoder) {
        pipeline.addLast(
            HttpServerRequestTracingHandler.class.getName(), new HttpServerRequestTracingHandler());
      } else if (handler instanceof HttpResponseEncoder) {
        pipeline.addLast(
            HttpServerResponseTracingHandler.class.getName(), new HttpServerResponseTracingHandler());
      } else
      // Client pipeline handlers
      if (handler instanceof HttpClientCodec) {
        pipeline.addLast(HttpClientTracingHandler.class.getName(), new HttpClientTracingHandler());
      } else if (handler instanceof HttpRequestEncoder) {
        pipeline.addLast(
            HttpClientRequestTracingHandler.class.getName(), new HttpClientRequestTracingHandler());
      } else if (handler instanceof HttpResponseDecoder) {
        pipeline.addLast(
            HttpClientResponseTracingHandler.class.getName(), new HttpClientResponseTracingHandler());
      }
    }
  
    private ChannelPipelineUtil() {}
  }
  