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/*
* Copyright (c) 2021, 2022, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2021, BELLSOFT. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include <stdio.h>
#include "jni.h"
static volatile jobject ref = NULL;
JNIEXPORT jint JNICALL
JNI_OnLoad(JavaVM *vm, void *reserved)
{
JNIEnv *env;
printf("Native library loaded.\n");
fflush(stdout);
if ((*vm)->GetEnv(vm, (void**) &env, JNI_VERSION_1_2) != JNI_OK) {
return JNI_EVERSION; /* JNI version not supported */
}
return JNI_VERSION_1_2;
}
JNIEXPORT void JNICALL Java_p_Class1_setRef(JNIEnv *env, jobject this, jobject obj) {
if (ref == NULL) {
// Only create a single GlobalRef
ref = (*env)->NewGlobalRef(env, obj);
printf("GlobalRef created\n");
}
}
JNIEXPORT void JNICALL
JNI_OnUnload(JavaVM *vm, void *reserved) {
if (ref != NULL) {
JNIEnv *env = NULL;
if ((*vm)->GetEnv(vm, (void**) &env, JNI_VERSION_1_2) != JNI_OK) {
return; /* JNI version not supported */
}
(*env)->DeleteGlobalRef(env, ref);
printf("GlobalRef deleted\n");
}
printf("Native library unloaded.\n");
fflush(stdout);
}
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