content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.spymemcached;
  
  import static io.opentelemetry.javaagent.bootstrap.Java8BytecodeBridge.currentContext;
  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.namedOneOf;
  import static net.bytebuddy.matcher.ElementMatchers.not;
  import static net.bytebuddy.matcher.ElementMatchers.returns;
  
  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 net.spy.memcached.MemcachedClient;
  import net.spy.memcached.internal.BulkFuture;
  import net.spy.memcached.internal.GetFuture;
  import net.spy.memcached.internal.OperationFuture;
  
  public class MemcachedClientInstrumentation implements TypeInstrumentation {
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return named("net.spy.memcached.MemcachedClient");
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          isMethod()
              .and(isPublic())
              .and(returns(named("net.spy.memcached.internal.OperationFuture")))
              // Flush seems to have a bug when listeners may not be always called.
              // Also tracing flush is probably of a very limited value.
              .and(not(named("flush"))),
          this.getClass().getName() + "$AsyncOperationAdvice");
      transformer.applyAdviceToMethod(
          isMethod().and(isPublic()).and(returns(named("net.spy.memcached.internal.GetFuture"))),
          this.getClass().getName() + "$AsyncGetAdvice");
      transformer.applyAdviceToMethod(
          isMethod().and(isPublic()).and(returns(named("net.spy.memcached.internal.BulkFuture"))),
          this.getClass().getName() + "$AsyncBulkAdvice");
      transformer.applyAdviceToMethod(
          isMethod().and(isPublic()).and(namedOneOf("incr", "decr")),
          this.getClass().getName() + "$SyncOperationAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class AsyncOperationAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void trackCallDepth(@Advice.Local("otelCallDepth") CallDepth callDepth) {
        callDepth = CallDepth.forClass(MemcachedClient.class);
        callDepth.getAndIncrement();
      }
  
      @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
      public static void methodExit(
          @Advice.This MemcachedClient client,
          @Advice.Origin("#m") String methodName,
          @Advice.Return OperationFuture<?> future,
          @Advice.Local("otelCallDepth") CallDepth callDepth) {
        if (callDepth.decrementAndGet() > 0) {
          return;
        }
  
        if (future != null) {
          OperationCompletionListener listener =
              OperationCompletionListener.create(
                  currentContext(), client.getConnection(), methodName);
          if (listener != null) {
            future.addListener(listener);
          }
        }
      }
    }
  
    @SuppressWarnings("unused")
    public static class AsyncGetAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void trackCallDepth(@Advice.Local("otelCallDepth") CallDepth callDepth) {
        callDepth = CallDepth.forClass(MemcachedClient.class);
        callDepth.getAndIncrement();
      }
  
      @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
      public static void methodExit(
          @Advice.This MemcachedClient client,
          @Advice.Origin("#m") String methodName,
          @Advice.Return GetFuture<?> future,
          @Advice.Local("otelCallDepth") CallDepth callDepth) {
        if (callDepth.decrementAndGet() > 0) {
          return;
        }
  
        if (future != null) {
          GetCompletionListener listener =
              GetCompletionListener.create(currentContext(), client.getConnection(), methodName);
          if (listener != null) {
            future.addListener(listener);
          }
        }
      }
    }
  
    @SuppressWarnings("unused")
    public static class AsyncBulkAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void trackCallDepth(@Advice.Local("otelCallDepth") CallDepth callDepth) {
        callDepth = CallDepth.forClass(MemcachedClient.class);
        callDepth.getAndIncrement();
      }
  
      @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
      public static void methodExit(
          @Advice.This MemcachedClient client,
          @Advice.Origin("#m") String methodName,
          @Advice.Return BulkFuture<?> future,
          @Advice.Local("otelCallDepth") CallDepth callDepth) {
        if (callDepth.decrementAndGet() > 0) {
          return;
        }
  
        if (future != null) {
          BulkGetCompletionListener listener =
              BulkGetCompletionListener.create(currentContext(), client.getConnection(), methodName);
          if (listener != null) {
            future.addListener(listener);
          }
        }
      }
    }
  
    @SuppressWarnings("unused")
    public static class SyncOperationAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static SyncCompletionListener methodEnter(
          @Advice.This MemcachedClient client,
          @Advice.Origin("#m") String methodName,
          @Advice.Local("otelCallDepth") CallDepth callDepth) {
        callDepth = CallDepth.forClass(MemcachedClient.class);
        if (callDepth.getAndIncrement() > 0) {
          return null;
        }
  
        return SyncCompletionListener.create(currentContext(), client.getConnection(), methodName);
      }
  
      @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
      public static void methodExit(
          @Advice.Enter SyncCompletionListener listener,
          @Advice.Thrown Throwable thrown,
          @Advice.Local("otelCallDepth") CallDepth callDepth) {
        if (callDepth.decrementAndGet() > 0 || listener == null) {
          return;
        }
  
        listener.done(thrown);
      }
    }
  }
  