https://developers.google.com/protocol-buffers/protobuf-java/: Core Protocol Buffers library. Protocol Buffers are a way of encoding structured data in an efficient yet extensible format. 
public interface com.google.protobuf.BlockingService
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.google.protobuf.BlockingService
  super_class: java.lang.Object
{
  public abstract com.google.protobuf.Descriptors$ServiceDescriptor getDescriptorForType();
    descriptor: ()Lcom/google/protobuf/Descriptors$ServiceDescriptor;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract com.google.protobuf.Message callBlockingMethod(com.google.protobuf.Descriptors$MethodDescriptor, com.google.protobuf.RpcController, com.google.protobuf.Message);
    descriptor: (Lcom/google/protobuf/Descriptors$MethodDescriptor;Lcom/google/protobuf/RpcController;Lcom/google/protobuf/Message;)Lcom/google/protobuf/Message;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws com.google.protobuf.ServiceException
    MethodParameters:
            Name  Flags
      method      
      controller  
      request     

  public abstract com.google.protobuf.Message getRequestPrototype(com.google.protobuf.Descriptors$MethodDescriptor);
    descriptor: (Lcom/google/protobuf/Descriptors$MethodDescriptor;)Lcom/google/protobuf/Message;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
        Name  Flags
      method  

  public abstract com.google.protobuf.Message getResponsePrototype(com.google.protobuf.Descriptors$MethodDescriptor);
    descriptor: (Lcom/google/protobuf/Descriptors$MethodDescriptor;)Lcom/google/protobuf/Message;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
        Name  Flags
      method  
}
SourceFile: "BlockingService.java"
InnerClasses:
  public final MethodDescriptor = com.google.protobuf.Descriptors$MethodDescriptor of com.google.protobuf.Descriptors
  public final ServiceDescriptor = com.google.protobuf.Descriptors$ServiceDescriptor of com.google.protobuf.Descriptors