Java example source code file (DiagnosticCommandImpl.c)

This example Java source code file (DiagnosticCommandImpl.c) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

invalid, java_sun_management_diagnosticcommandimpl_executediagnosticcommand, java_sun_management_diagnosticcommandimpl_getdiagnosticcommandinfo, java_sun_management_diagnosticcommandimpl_getdiagnosticcommands, jmm_version_1_2_2, jnicall, jnienv, jniexport, jnu_newobjectbyname, jnu_throwbyname, jnu_throwoutofmemoryerror, null, string

The DiagnosticCommandImpl.c Java example source code

/*
 * Copyright (c) 2013, 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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 "management.h"
#include "sun_management_DiagnosticCommandImpl.h"

JNIEXPORT void JNICALL Java_sun_management_DiagnosticCommandImpl_setNotificationEnabled
(JNIEnv *env, jobject dummy, jboolean enabled) {
    if(jmm_version > JMM_VERSION_1_2_2) {
        jmm_interface->SetDiagnosticFrameworkNotificationEnabled(env, enabled);
    } else {
        JNU_ThrowByName(env, "java/lang/UnsupportedOperationException",
                        "JMX interface to diagnostic framework notifications is not supported by this VM");
    }
}

JNIEXPORT jobjectArray JNICALL
Java_sun_management_DiagnosticCommandImpl_getDiagnosticCommands
  (JNIEnv *env, jobject dummy)
{
  return jmm_interface->GetDiagnosticCommands(env);
}

jobject getDiagnosticCommandArgumentInfoArray(JNIEnv *env, jstring command,
                                              int num_arg) {
  int i;
  jobject obj;
  jobjectArray result;
  dcmdArgInfo* dcmd_arg_info_array;
  jclass dcmdArgInfoCls;
  jclass arraysCls;
  jmethodID mid;
  jobject resultList;

  dcmd_arg_info_array = (dcmdArgInfo*) malloc(num_arg * sizeof(dcmdArgInfo));
  if (dcmd_arg_info_array == NULL) {
    return NULL;
  }
  jmm_interface->GetDiagnosticCommandArgumentsInfo(env, command,
                                                   dcmd_arg_info_array);
  dcmdArgInfoCls = (*env)->FindClass(env,
                                     "sun/management/DiagnosticCommandArgumentInfo");
  result = (*env)->NewObjectArray(env, num_arg, dcmdArgInfoCls, NULL);
  if (result == NULL) {
    free(dcmd_arg_info_array);
    return NULL;
  }
  for (i=0; i<num_arg; i++) {
    obj = JNU_NewObjectByName(env,
                              "sun/management/DiagnosticCommandArgumentInfo",
                              "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;ZZZI)V",
                              (*env)->NewStringUTF(env,dcmd_arg_info_array[i].name),
                              (*env)->NewStringUTF(env,dcmd_arg_info_array[i].description),
                              (*env)->NewStringUTF(env,dcmd_arg_info_array[i].type),
                              dcmd_arg_info_array[i].default_string == NULL ? NULL:
                              (*env)->NewStringUTF(env, dcmd_arg_info_array[i].default_string),
                              dcmd_arg_info_array[i].mandatory,
                              dcmd_arg_info_array[i].option,
                              dcmd_arg_info_array[i].multiple,
                              dcmd_arg_info_array[i].position);
    if (obj == NULL) {
      free(dcmd_arg_info_array);
      return NULL;
    }
    (*env)->SetObjectArrayElement(env, result, i, obj);
  }
  free(dcmd_arg_info_array);
  arraysCls = (*env)->FindClass(env, "java/util/Arrays");
  mid = (*env)->GetStaticMethodID(env, arraysCls,
                                  "asList", "([Ljava/lang/Object;)Ljava/util/List;");
  resultList = (*env)->CallStaticObjectMethod(env, arraysCls, mid, result);
  return resultList;
}

/* Throws IllegalArgumentException if at least one of the diagnostic command
 * passed in argument is not supported by the JVM
 */
JNIEXPORT jobjectArray JNICALL
Java_sun_management_DiagnosticCommandImpl_getDiagnosticCommandInfo
(JNIEnv *env, jobject dummy, jobjectArray commands)
{
  int i;
  jclass dcmdInfoCls;
  jobject result;
  jobjectArray args;
  jobject obj;
  jmmOptionalSupport mos;
  jint ret = jmm_interface->GetOptionalSupport(env, &mos);
  jsize num_commands;
  dcmdInfo* dcmd_info_array;

  if (commands == NULL) {
      JNU_ThrowNullPointerException(env, "Invalid String Array");
      return NULL;
  }
  num_commands = (*env)->GetArrayLength(env, commands);
  dcmd_info_array = (dcmdInfo*) malloc(num_commands *
                                       sizeof(dcmdInfo));
  if (dcmd_info_array == NULL) {
      JNU_ThrowOutOfMemoryError(env, NULL);
  }
  jmm_interface->GetDiagnosticCommandInfo(env, commands, dcmd_info_array);
  dcmdInfoCls = (*env)->FindClass(env,
                                  "sun/management/DiagnosticCommandInfo");
  result = (*env)->NewObjectArray(env, num_commands, dcmdInfoCls, NULL);
  if (result == NULL) {
      free(dcmd_info_array);
      JNU_ThrowOutOfMemoryError(env, 0);
  }
  for (i=0; i<num_commands; i++) {
      args = getDiagnosticCommandArgumentInfoArray(env,
                                                   (*env)->GetObjectArrayElement(env,commands,i),
                                                   dcmd_info_array[i].num_arguments);
      if (args == NULL) {
          free(dcmd_info_array);
          JNU_ThrowOutOfMemoryError(env, 0);
      }
      obj = JNU_NewObjectByName(env,
                                "sun/management/DiagnosticCommandInfo",
                                "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;ZLjava/util/List;)V",
                                (*env)->NewStringUTF(env,dcmd_info_array[i].name),
                                (*env)->NewStringUTF(env,dcmd_info_array[i].description),
                                (*env)->NewStringUTF(env,dcmd_info_array[i].impact),
                                dcmd_info_array[i].permission_class==NULL?NULL:(*env)->NewStringUTF(env,dcmd_info_array[i].permission_class),
                                dcmd_info_array[i].permission_name==NULL?NULL:(*env)->NewStringUTF(env,dcmd_info_array[i].permission_name),
                                dcmd_info_array[i].permission_action==NULL?NULL:(*env)->NewStringUTF(env,dcmd_info_array[i].permission_action),
                                dcmd_info_array[i].enabled,
                                args);
      if (obj == NULL) {
          free(dcmd_info_array);
          JNU_ThrowOutOfMemoryError(env, 0);
      }
      (*env)->SetObjectArrayElement(env, result, i, obj);
  }
  free(dcmd_info_array);
  return result;
}

/* Throws IllegalArgumentException if the diagnostic command
 * passed in argument is not supported by the JVM
 */
JNIEXPORT jstring JNICALL
Java_sun_management_DiagnosticCommandImpl_executeDiagnosticCommand
(JNIEnv *env, jobject dummy, jstring command) {
  return jmm_interface->ExecuteDiagnosticCommand(env, command);
}