Invoking a C callback, received through SWIG, from Java code

I am using SWIG to generate Java and C++ wrappers to connect Java and C code: Java code ↔ C++ wrapper code ↔ C code.

1. C structure is defined like below, with a callback function pointer:

   BOOL (STDCALL *sendAsyncRequest)(http_req_params *params, http_req **req);
   
   typedef struct http_req_params
   {
       CHAR*                url;
       struct
       {
           UCHAR          name[100];
           UCHAR          val[100];
       } hdrs[10];
       plt_http_responseCB    rspCallBack;
       plt_http_type_params           *http_type_params;
       plt_http_req_multipart_info    *multipartReqData;
   } _plt_http_req_params;
   
   typedef struct {
       UINT32                           length;
       VOID                             *pMultipartContent;
       CHAR                             contentType[10];
   } http_req_multipart_contents;
   
   typedef struct {
       CHAR                             multipartBoundaryInfo[10];
       UINT32                           multipartContentCount;
       http_req_multipart_contents         **multipartContents;
   } plt_http_req_multipart_info;
   

2. Now I want to wrap the above struct in a Java object using SWIG. How do we register for the callback function (plt_http_responseCB) with Java layer?

3. This is the response callback definition:

   typedef BOOL (STDCALL *plt_http_responseCB)(plt_http_rsp_params *rspInfo);
   
   typedef struct _plt_http_rsp_params
   {
       UINT16 reqStatus;
       UINT16 httpStatus;
       VOID * userData;
       plt_buf_info rspData;
       struct
       {
           UCHAR   name[100];
           UCHAR   val[100];
       } hdrs[10];
   } plt_http_rsp_params;
   

On some OS events, we need to notify the C layer with the callback function (plt_http_responseCB) which we received as part of C struct.

How can I achieve this using SWIG and generate Java wrappers? How can I apply the “director” feature in this use case?