content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.jsp;
  
  import io.opentelemetry.api.GlobalOpenTelemetry;
  import io.opentelemetry.api.common.AttributesBuilder;
  import io.opentelemetry.context.Context;
  import io.opentelemetry.instrumentation.api.instrumenter.AttributesExtractor;
  import io.opentelemetry.instrumentation.api.instrumenter.Instrumenter;
  import io.opentelemetry.instrumentation.api.instrumenter.SpanKindExtractor;
  import io.opentelemetry.javaagent.bootstrap.internal.AgentInstrumentationConfig;
  import javax.annotation.Nullable;
  import org.apache.jasper.JspCompilationContext;
  import org.apache.jasper.compiler.Compiler;
  
  public class JspCompilationContextInstrumentationSingletons {
    private static final boolean CAPTURE_EXPERIMENTAL_SPAN_ATTRIBUTES =
        AgentInstrumentationConfig.get()
            .getBoolean("otel.instrumentation.jsp.experimental-span-attributes", false);
  
    private static final Instrumenter<JspCompilationContext, Void> INSTRUMENTER;
  
    static {
      INSTRUMENTER =
          Instrumenter.<JspCompilationContext, Void>builder(
                  GlobalOpenTelemetry.get(),
                  "io.opentelemetry.jsp-2.3",
                  JspCompilationContextInstrumentationSingletons::spanNameOnCompile)
              .addAttributesExtractor(new CompilationAttributesExtractor())
              .buildInstrumenter(SpanKindExtractor.alwaysInternal());
    }
  
    public static String spanNameOnCompile(JspCompilationContext jspCompilationContext) {
      return "Compile " + jspCompilationContext.getJspFile();
    }
  
    public static Instrumenter<JspCompilationContext, Void> instrumenter() {
      return INSTRUMENTER;
    }
  
    private JspCompilationContextInstrumentationSingletons() {}
  
    private static class CompilationAttributesExtractor
        implements AttributesExtractor<JspCompilationContext, Void> {
  
      @Override
      public void onStart(
          AttributesBuilder attributes,
          Context parentContext,
          JspCompilationContext jspCompilationContext) {}
  
      @Override
      public void onEnd(
          AttributesBuilder attributes,
          Context context,
          JspCompilationContext jspCompilationContext,
          @Nullable Void unused,
          @Nullable Throwable error) {
        if (!CAPTURE_EXPERIMENTAL_SPAN_ATTRIBUTES) {
          return;
        }
  
        Compiler compiler = jspCompilationContext.getCompiler();
        if (compiler != null) {
          attributes.put("jsp.compiler", compiler.getClass().getName());
        }
        attributes.put("jsp.classFQCN", jspCompilationContext.getFQCN());
      }
    }
  }
  