extern "C" JavaVM *g_JavaVM = nullptr;

void setJVM(JavaVM *vm)
{
	g_JavaVM = vm;
}

JavaVM *getJVM()
{
	return g_JavaVM;
}

jint JNI_OnLoad(JavaVM* jvm, void* /*reserved*/)
{
	JNIEnv *env;
	if (jvm->GetEnv((void**) &env, JNI_VERSION_1_6) != JNI_OK)
	{
		return -1;
	}

	LOGI("JNI", "jvm(%p) on loading", jvm);

	setJVM(jvm);

	return JNI_VERSION_1_6;
}

void JNI_OnUnload(JavaVM* jvm, void* /*reserved*/)
{
	JNIEnv *env;
	if (jvm->GetEnv((void**) &env, JNI_VERSION_1_6) != JNI_OK) {
		return;
	}

	LOGI("JNI", "jvm(%p) on unloading", getJVM());

	setJVM(NULL);
}

#define ATTACH_JVM(jni_env)  \
JNIEnv *g_env = NULL;\
int env_status = getJVM()->GetEnv((void **)&g_env, JNI_VERSION_1_6); \
bool bShouldDetach = false; \
if(env_status == JNI_EDETACHED) {\
    jint attachResult = getJVM()->AttachCurrentThread(&jni_env, NULL); \
    if(attachResult >= 0) \
        bShouldDetach = true;\
    else \
        jni_env = NULL; \
}\
else if(JNI_OK == env_status){ \
    jni_env = g_env; \
}\
else {\
    jni_env = NULL; \
}

#define DETACH_JVM(jni_env)   { if( bShouldDetach ){ getJVM()->DetachCurrentThread(); }}