https://openjdk.java.net/ 
public interface jdk.incubator.http.internal.common.AsyncDataReadQueue$DataConsumer
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: jdk.incubator.http.internal.common.AsyncDataReadQueue$DataConsumer
  super_class: java.lang.Object
{
  public abstract boolean accept(jdk.incubator.http.internal.frame.Http2Frame);
    descriptor: (Ljdk/incubator/http/internal/frame/Http2Frame;)Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.lang.Throwable
    MethodParameters:
      Name  Flags
      t     
}
SourceFile: "AsyncDataReadQueue.java"
NestHost: jdk.incubator.http.internal.common.AsyncDataReadQueue
InnerClasses:
  public abstract DataConsumer = jdk.incubator.http.internal.common.AsyncDataReadQueue$DataConsumer of jdk.incubator.http.internal.common.AsyncDataReadQueue
    RuntimeVisibleAnnotations: 
      java.lang.FunctionalInterface()