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.RpcChannel
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.google.protobuf.RpcChannel
  super_class: java.lang.Object
{
  public abstract void callMethod(com.google.protobuf.Descriptors$MethodDescriptor, com.google.protobuf.RpcController, com.google.protobuf.Message, com.google.protobuf.Message, com.google.protobuf.RpcCallback<com.google.protobuf.Message>);
    descriptor: (Lcom/google/protobuf/Descriptors$MethodDescriptor;Lcom/google/protobuf/RpcController;Lcom/google/protobuf/Message;Lcom/google/protobuf/Message;Lcom/google/protobuf/RpcCallback;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (Lcom/google/protobuf/Descriptors$MethodDescriptor;Lcom/google/protobuf/RpcController;Lcom/google/protobuf/Message;Lcom/google/protobuf/Message;Lcom/google/protobuf/RpcCallback<Lcom/google/protobuf/Message;>;)V
    MethodParameters:
                   Name  Flags
      method             
      controller         
      request            
      responsePrototype  
      done               
}
SourceFile: "RpcChannel.java"
InnerClasses:
  public final MethodDescriptor = com.google.protobuf.Descriptors$MethodDescriptor of com.google.protobuf.Descriptors