text: /*
   * Copyright (c) 2016 Cisco and/or its affiliates.
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at:
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #include <vnet/vnet.h>
  
  #include <ioam/lib-trace/trace_msg_enum.h>
  #define vl_typedefs             /* define message structures */
  #include <ioam/lib-trace/trace_all_api_h.h>
  #undef vl_typedefs
  
  #include <vnet/api_errno.h>
  #include <vlibapi/api.h>
  #include <vlibmemory/api.h>
  
  #if VPPJNI_DEBUG == 1
    #define DEBUG_LOG(...) clib_warning(__VA_ARGS__)
  #else
    #define DEBUG_LOG(...)
  #endif
  
  #include <jvpp-common/jvpp_common.h>
  
  #include "jvpp-ioamtrace/io_fd_vpp_jvpp_ioamtrace_JVppIoamtraceImpl.h"
  #include "jvpp_ioam_trace.h"
  #include "jvpp-ioamtrace/jvpp_ioamtrace_gen.h"
  
  /*
   * Class:     io_fd_vpp_jvpp_ioamtrace_JVppIoamtraceImpl
   * Method:    init0
   * Signature: (JI)V
   */
  JNIEXPORT void JNICALL Java_io_fd_vpp_jvpp_ioamtrace_JVppIoamtraceImpl_init0
    (JNIEnv *env, jclass clazz, jobject callback, jlong queue_address, jint my_client_index) {
    ioamtrace_main_t * plugin_main = &ioamtrace_main;
    clib_warning ("Java_io_fd_vpp_jvpp_ioamtrace_JVppIoamtraceImpl_init0");
  
    plugin_main->my_client_index = my_client_index;
    plugin_main->vl_input_queue = uword_to_pointer (queue_address, svm_queue_t *);
  
    plugin_main->callbackObject = (*env)->NewGlobalRef(env, callback);
    plugin_main->callbackClass = (jclass)(*env)->NewGlobalRef(env, (*env)->GetObjectClass(env, callback));
  
    // verify API has not changed since jar generation
    #define _(N)             \
        if (get_message_id(env, #N) == 0) return;
        foreach_supported_api_message;
    #undef _
  
    #define _(N,n)                                  \
        vl_msg_api_set_handlers(get_message_id(env, #N), #n,     \
                vl_api_##n##_t_handler,             \
                vl_noop_handler,                    \
                vl_noop_handler,                    \
                vl_noop_handler,                    \
                sizeof(vl_api_##n##_t), 1);
        foreach_api_reply_handler;
    #undef _
  }
  
  JNIEXPORT void JNICALL Java_io_fd_vpp_jvpp_ioamtrace_JVppIoamtraceImpl_close0
  (JNIEnv *env, jclass clazz) {
    ioamtrace_main_t * plugin_main = &ioamtrace_main;
  
      // cleanup:
      (*env)->DeleteGlobalRef(env, plugin_main->callbackClass);
      (*env)->DeleteGlobalRef(env, plugin_main->callbackObject);
  
      plugin_main->callbackClass = NULL;
      plugin_main->callbackObject = NULL;
  }
  
  /* Attach thread to JVM and cache class references when initiating JVPP iOAM Trace */
  jint JNI_OnLoad(JavaVM *vm, void *reserved) {
      JNIEnv* env;
  
      if ((*vm)->GetEnv(vm, (void**) &env, JNI_VERSION_1_8) != JNI_OK) {
          return JNI_EVERSION;
      }
  
      if (cache_class_references(env) != 0) {
          clib_warning ("Failed to cache class references\n");
          return JNI_ERR;
      }
  
      return JNI_VERSION_1_8;
  }
  
  /* Clean up cached references when disposing JVPP iOAM Trace */
  void JNI_OnUnload(JavaVM *vm, void *reserved) {
      JNIEnv* env;
      if ((*vm)->GetEnv(vm, (void**) &env, JNI_VERSION_1_8) != JNI_OK) {
          return;
      }
      delete_class_references(env);
  }
  