core/sql/langman/LmJavaHooks.h

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#ifndef LMJAVAHOOKS_H
#define LMJAVAHOOKS_H
/* -*-C++-*-
******************************************************************************
*
* File:         LmJavaHooks.h
* Description:  A class containing static functions that we register
*               as callback functions when we create a JVM
*
* Created:      June 2003
* Language:     C++
*
*
******************************************************************************
*/

#include "Platform.h"
  #include "lmjni.h"
#include <stdarg.h>
#include <stdio.h>

#define LMJ_HOOK_TEXT_BUF_SIZE 2048

class LmJavaHooks
{
public:
  // These are the callback functions that the JVM will call
  static void JNICALL abortHookJVM();
  static void JNICALL exitHookJVM(jint);
  static jint JNICALL vfprintfHookJVM(FILE *, const char *, va_list);

  // These are functions called by the layer of code that creates the
  // JVM. init_vfprintfHook() should be called before creating the
  // JVM. get_vfprintfText() can can be called anytime after JVM
  // creation or anytime the JVM is running, to see if any console
  // messages have been generated by the JVM.
  static void init_vfprintfHook();
  static const char *get_vfprintfText() { return textBuf_; }

private:
  // We are storing JVM console messages in a global text
  // buffer. Sometimes after an MXUDR crash it is useful to load the
  // saveabend file into a debugger and display the contents of this
  // buffer (e.g. in INSPECT enter "d LmJavaHooks::textBuf_"). You may
  // discover some error information reported by the JVM that did not
  // get packaged into SQL diagnostics for the calling application.
  static char textBuf_[LMJ_HOOK_TEXT_BUF_SIZE];

};

#endif // LMJAVAHOOKS_H