/*

 * Copyright (c) 2007, 2018, Oracle and/or its affiliates. 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 <jni.h>

#include <jvmti.h>

#include "agent_common.h"

#include <string.h>

#include "jvmti_tools.h"

#include "JVMTITools.h"

#ifdef __cplusplus

extern "C" {

#endif

#define FILE_NAME "nsk/jvmti/scenarios/hotswap/HS104/hs104t001/MyClass"

#define CLASS_NAME "Lnsk/jvmti/scenarios/hotswap/HS104/hs104t001/MyClass;"

JNIEXPORT void JNICALL

    callbackClassPrepare(jvmtiEnv *jvmti,

            JNIEnv* jni,

            jthread thread,

            jclass klass) {

    char * className;

    char * generic;

    (*jvmti)->GetClassSignature(jvmti, klass, &className, &generic);

    if (strcmp(className, CLASS_NAME) == 0) {

        char fileName[512];

        nsk_jvmti_getFileName(0, FILE_NAME, fileName,

                        sizeof(fileName)/sizeof(char));

        if ( nsk_jvmti_redefineClass(jvmti, klass, fileName ) == NSK_TRUE ) {

            nsk_printf("Agent:: Successfully redefined..");

            if ( nsk_jvmti_disableNotification(jvmti,JVMTI_EVENT_CLASS_PREPARE, NULL) == NSK_TRUE ) {

                nsk_printf(" Agent :: NOTIFICATIONS ARE DISABLED \n");

            } else {

                nsk_printf(" Agent :: Failed to disabled \n");

            }

        } else {

            nsk_printf("Agent:: Failed to redefine..");

        }

    }

}

#ifdef STATIC_BUILD

JNIEXPORT jint JNICALL Agent_OnLoad_hs104t001(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNICALL Agent_OnAttach_hs104t001(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNI_OnLoad_hs104t001(JavaVM *jvm, char *options, void *reserved) {

    return JNI_VERSION_1_8;

}

#endif

jint  Agent_Initialize(JavaVM *vm, char *options, void *reserved) {

    jint rc ;

    jvmtiEnv * jvmti;

    nsk_printf("Agent:: VM.. Started..\n");

    rc=(*vm)->GetEnv(vm, (void **)&jvmti, JVMTI_VERSION_1_1);

    if ( rc!= JNI_OK ) {

        nsk_printf("Agent:: Could not load JVMTI interface \n");

        return JNI_ERR;

    } else {

        jvmtiCapabilities caps;

        jvmtiEventCallbacks eventCallbacks;

        if (nsk_jvmti_parseOptions(options) == NSK_FALSE ) {

            nsk_printf("# error agent Failed to parse options \n");

            return JNI_ERR;

        }

        memset(&caps, 0, sizeof(caps));

        caps.can_redefine_classes = 1;

        caps.can_generate_all_class_hook_events = 1;

        (*jvmti)->AddCapabilities(jvmti, &caps);

        memset(&eventCallbacks, 0, sizeof(eventCallbacks));

        eventCallbacks.ClassPrepare =callbackClassPrepare;

        rc=(*jvmti)->SetEventCallbacks(jvmti,&eventCallbacks, sizeof(eventCallbacks));

        if (rc != JVMTI_ERROR_NONE) {

            nsk_printf(" Agent:: Error occured while setting event call back \n");

            return JNI_ERR;

        }

        if ( nsk_jvmti_enableNotification(jvmti,

                    JVMTI_EVENT_CLASS_PREPARE, NULL) == NSK_TRUE ) {

            nsk_printf("Agent :: NOTIFICATIONS ARE ENABLED \n");

        } else {

            nsk_printf(" Error in Eanableing Notifications..");

        }

    }

    return JNI_OK;

}

#ifdef __cplusplus

}

#endif