2 * collectd - src/java.c
3 * Copyright (C) 2009 Florian octo Forster
4 * Copyright (C) 2008 Justo Alonso Achaques
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; only version 2 of the License is applicable.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * Florian octo Forster <octo at verplant.org>
21 * Justo Alonso Achaques <justo.alonso at gmail.com>
31 #if !defined(JNI_VERSION_1_2)
32 # error "Need JNI 1.2 compatible interface!"
38 struct java_plugin_s /* {{{ */
46 #define CJNI_FLAG_ENABLED 0x0001
55 typedef struct java_plugin_s java_plugin_t;
61 static JavaVM *jvm = NULL;
63 static char **jvm_argv = NULL;
64 static size_t jvm_argc = 0;
66 static java_plugin_t *java_plugins = NULL;
67 static size_t java_plugins_num = 0;
70 * C to Java conversion functions
72 static int ctoj_string (JNIEnv *jvm_env, /* {{{ */
74 jclass class_ptr, jobject object_ptr, const char *method_name)
79 /* Create a java.lang.String */
80 o_string = (*jvm_env)->NewStringUTF (jvm_env,
81 (string != NULL) ? string : "");
84 ERROR ("java plugin: ctoj_string: NewStringUTF failed.");
88 /* Search for the `void setFoo (String s)' method. */
89 m_set = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
90 method_name, "(Ljava/lang/String;)V");
93 ERROR ("java plugin: ctoj_string: Cannot find method `void %s (String)'.",
95 (*jvm_env)->DeleteLocalRef (jvm_env, o_string);
99 /* Call the method. */
100 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_set, o_string);
102 /* Decrease reference counter on the java.lang.String object. */
103 (*jvm_env)->DeleteLocalRef (jvm_env, o_string);
105 DEBUG ("java plugin: ctoj_string: ->%s (%s);",
106 method_name, (string != NULL) ? string : "");
109 } /* }}} int ctoj_string */
111 static int ctoj_int (JNIEnv *jvm_env, /* {{{ */
113 jclass class_ptr, jobject object_ptr, const char *method_name)
117 /* Search for the `void setFoo (int i)' method. */
118 m_set = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
119 method_name, "(I)V");
122 ERROR ("java plugin: ctoj_int: Cannot find method `void %s (int)'.",
127 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_set, value);
129 DEBUG ("java plugin: ctoj_int: ->%s (%i);",
130 method_name, (int) value);
133 } /* }}} int ctoj_int */
135 static int ctoj_long (JNIEnv *jvm_env, /* {{{ */
137 jclass class_ptr, jobject object_ptr, const char *method_name)
141 /* Search for the `void setFoo (long l)' method. */
142 m_set = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
143 method_name, "(J)V");
146 ERROR ("java plugin: ctoj_long: Cannot find method `void %s (long)'.",
151 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_set, value);
153 DEBUG ("java plugin: ctoj_long: ->%s (%"PRIi64");",
154 method_name, (int64_t) value);
157 } /* }}} int ctoj_long */
159 static int ctoj_double (JNIEnv *jvm_env, /* {{{ */
161 jclass class_ptr, jobject object_ptr, const char *method_name)
165 /* Search for the `void setFoo (double d)' method. */
166 m_set = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
167 method_name, "(D)V");
170 ERROR ("java plugin: ctoj_double: Cannot find method `void %s (double)'.",
175 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_set, value);
177 DEBUG ("java plugin: ctoj_double: ->%s (%g);",
178 method_name, (double) value);
181 } /* }}} int ctoj_double */
183 /* Convert a jlong to a java.lang.Number */
184 static jobject ctoj_jlong_to_number (JNIEnv *jvm_env, jlong value) /* {{{ */
187 jmethodID m_long_constructor;
189 /* Look up the java.lang.Long class */
190 c_long = (*jvm_env)->FindClass (jvm_env, "java.lang.Long");
193 ERROR ("java plugin: ctoj_jlong_to_number: Looking up the "
194 "java.lang.Long class failed.");
198 m_long_constructor = (*jvm_env)->GetMethodID (jvm_env,
199 c_long, "<init>", "(J)V");
200 if (m_long_constructor == NULL)
202 ERROR ("java plugin: ctoj_jlong_to_number: Looking up the "
203 "`Long (long)' constructor failed.");
207 return ((*jvm_env)->NewObject (jvm_env,
208 c_long, m_long_constructor, value));
209 } /* }}} jobject ctoj_jlong_to_number */
211 /* Convert a jdouble to a java.lang.Number */
212 static jobject ctoj_jdouble_to_number (JNIEnv *jvm_env, jdouble value) /* {{{ */
215 jmethodID m_double_constructor;
217 /* Look up the java.lang.Long class */
218 c_double = (*jvm_env)->FindClass (jvm_env, "java.lang.Double");
219 if (c_double == NULL)
221 ERROR ("java plugin: ctoj_jdouble_to_number: Looking up the "
222 "java.lang.Double class failed.");
226 m_double_constructor = (*jvm_env)->GetMethodID (jvm_env,
227 c_double, "<init>", "(D)V");
228 if (m_double_constructor == NULL)
230 ERROR ("java plugin: ctoj_jdouble_to_number: Looking up the "
231 "`Double (double)' constructor failed.");
235 return ((*jvm_env)->NewObject (jvm_env,
236 c_double, m_double_constructor, value));
237 } /* }}} jobject ctoj_jdouble_to_number */
239 /* Convert a value_t to a java.lang.Number */
240 static jobject ctoj_value_to_number (JNIEnv *jvm_env, /* {{{ */
241 value_t value, int ds_type)
243 if (ds_type == DS_TYPE_COUNTER)
244 return (ctoj_jlong_to_number (jvm_env, (jlong) value.counter));
245 else if (ds_type == DS_TYPE_GAUGE)
246 return (ctoj_jdouble_to_number (jvm_env, (jdouble) value.gauge));
249 } /* }}} jobject ctoj_value_to_number */
251 /* Convert a data_source_t to a org.collectd.protocol.DataSource */
252 static jobject ctoj_data_source (JNIEnv *jvm_env, /* {{{ */
253 const data_source_t *dsrc)
256 jmethodID m_datasource_constructor;
257 jobject o_datasource;
260 /* Look up the DataSource class */
261 c_datasource = (*jvm_env)->FindClass (jvm_env,
262 "org.collectd.protocol.DataSource");
263 if (c_datasource == NULL)
265 ERROR ("java plugin: ctoj_data_source: "
266 "FindClass (org.collectd.protocol.DataSource) failed.");
270 /* Lookup the `ValueList ()' constructor. */
271 m_datasource_constructor = (*jvm_env)->GetMethodID (jvm_env, c_datasource,
273 if (m_datasource_constructor == NULL)
275 ERROR ("java plugin: ctoj_data_source: Cannot find the "
276 "`DataSource ()' constructor.");
280 /* Create a new instance. */
281 o_datasource = (*jvm_env)->NewObject (jvm_env, c_datasource,
282 m_datasource_constructor);
283 if (o_datasource == NULL)
285 ERROR ("java plugin: ctoj_data_source: "
286 "Creating a new DataSource instance failed.");
290 /* Set name via `void setName (String name)' */
291 status = ctoj_string (jvm_env, dsrc->name,
292 c_datasource, o_datasource, "setName");
295 ERROR ("java plugin: ctoj_data_source: "
296 "ctoj_string (setName) failed.");
297 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
301 /* Set type via `void setType (int type)' */
302 status = ctoj_int (jvm_env, dsrc->type,
303 c_datasource, o_datasource, "setType");
306 ERROR ("java plugin: ctoj_data_source: "
307 "ctoj_int (setType) failed.");
308 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
312 /* Set min via `void setMin (double min)' */
313 status = ctoj_double (jvm_env, dsrc->min,
314 c_datasource, o_datasource, "setMin");
317 ERROR ("java plugin: ctoj_data_source: "
318 "ctoj_double (setMin) failed.");
319 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
323 /* Set max via `void setMax (double max)' */
324 status = ctoj_double (jvm_env, dsrc->max,
325 c_datasource, o_datasource, "setMax");
328 ERROR ("java plugin: ctoj_data_source: "
329 "ctoj_double (setMax) failed.");
330 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
334 return (o_datasource);
335 } /* }}} jobject ctoj_data_source */
337 /* Convert a oconfig_value_t to a org.collectd.api.OConfigValue */
338 static jobject ctoj_oconfig_value (JNIEnv *jvm_env, /* {{{ */
339 oconfig_value_t ocvalue)
342 jmethodID m_ocvalue_constructor;
346 m_ocvalue_constructor = NULL;
349 c_ocvalue = (*jvm_env)->FindClass (jvm_env,
350 "org.collectd.api.OConfigValue");
351 if (c_ocvalue == NULL)
353 ERROR ("java plugin: ctoj_oconfig_value: "
354 "FindClass (org.collectd.api.OConfigValue) failed.");
358 if (ocvalue.type == OCONFIG_TYPE_BOOLEAN)
360 jboolean tmp_boolean;
362 tmp_boolean = (ocvalue.value.boolean == 0) ? JNI_FALSE : JNI_TRUE;
364 m_ocvalue_constructor = (*jvm_env)->GetMethodID (jvm_env, c_ocvalue,
366 if (m_ocvalue_constructor == NULL)
368 ERROR ("java plugin: ctoj_oconfig_value: Cannot find the "
369 "`OConfigValue (boolean)' constructor.");
373 return ((*jvm_env)->NewObject (jvm_env,
374 c_ocvalue, m_ocvalue_constructor, tmp_boolean));
375 } /* if (ocvalue.type == OCONFIG_TYPE_BOOLEAN) */
376 else if (ocvalue.type == OCONFIG_TYPE_STRING)
378 m_ocvalue_constructor = (*jvm_env)->GetMethodID (jvm_env, c_ocvalue,
379 "<init>", "(Ljava/lang/String;)V");
380 if (m_ocvalue_constructor == NULL)
382 ERROR ("java plugin: ctoj_oconfig_value: Cannot find the "
383 "`OConfigValue (String)' constructor.");
387 o_argument = (*jvm_env)->NewStringUTF (jvm_env, ocvalue.value.string);
388 if (o_argument == NULL)
390 ERROR ("java plugin: ctoj_oconfig_value: "
391 "Creating a String object failed.");
395 else if (ocvalue.type == OCONFIG_TYPE_NUMBER)
397 m_ocvalue_constructor = (*jvm_env)->GetMethodID (jvm_env, c_ocvalue,
398 "<init>", "(Ljava/lang/Number;)V");
399 if (m_ocvalue_constructor == NULL)
401 ERROR ("java plugin: ctoj_oconfig_value: Cannot find the "
402 "`OConfigValue (Number)' constructor.");
406 o_argument = ctoj_jdouble_to_number (jvm_env,
407 (jdouble) ocvalue.value.number);
408 if (o_argument == NULL)
410 ERROR ("java plugin: ctoj_oconfig_value: "
411 "Creating a Number object failed.");
420 assert (m_ocvalue_constructor != NULL);
421 assert (o_argument != NULL);
423 o_ocvalue = (*jvm_env)->NewObject (jvm_env,
424 c_ocvalue, m_ocvalue_constructor, o_argument);
425 if (o_ocvalue == NULL)
427 ERROR ("java plugin: ctoj_oconfig_value: "
428 "Creating an OConfigValue object failed.");
429 (*jvm_env)->DeleteLocalRef (jvm_env, o_argument);
433 (*jvm_env)->DeleteLocalRef (jvm_env, o_argument);
435 } /* }}} jobject ctoj_oconfig_value */
437 /* Convert a oconfig_item_t to a org.collectd.api.OConfigItem */
438 static jobject ctoj_oconfig_item (JNIEnv *jvm_env, /* {{{ */
439 const oconfig_item_t *ci)
442 jmethodID m_ocitem_constructor;
443 jmethodID m_addvalue;
444 jmethodID m_addchild;
449 c_ocitem = (*jvm_env)->FindClass (jvm_env, "org.collectd.api.OConfigItem");
450 if (c_ocitem == NULL)
452 ERROR ("java plugin: ctoj_oconfig_item: "
453 "FindClass (org.collectd.api.OConfigItem) failed.");
457 /* Get the required methods: m_ocitem_constructor, m_addvalue, and m_addchild
459 m_ocitem_constructor = (*jvm_env)->GetMethodID (jvm_env, c_ocitem,
460 "<init>", "(Ljava/lang/String;)V");
461 if (m_ocitem_constructor == NULL)
463 ERROR ("java plugin: ctoj_oconfig_item: Cannot find the "
464 "`OConfigItem (String)' constructor.");
468 m_addvalue = (*jvm_env)->GetMethodID (jvm_env, c_ocitem,
469 "addValue", "(Lorg/collectd/api/OConfigValue;)V");
470 if (m_addvalue == NULL)
472 ERROR ("java plugin: ctoj_oconfig_item: Cannot find the "
473 "`addValue (OConfigValue)' method.");
477 m_addchild = (*jvm_env)->GetMethodID (jvm_env, c_ocitem,
478 "addChild", "(Lorg/collectd/api/OConfigItem;)V");
479 if (m_addchild == NULL)
481 ERROR ("java plugin: ctoj_oconfig_item: Cannot find the "
482 "`addChild (OConfigItem)' method.");
487 /* Create a String object with the key.
488 * Needed for calling the constructor. */
489 o_key = (*jvm_env)->NewStringUTF (jvm_env, ci->key);
492 ERROR ("java plugin: ctoj_oconfig_item: "
493 "Creating String object failed.");
497 /* Create an OConfigItem object */
498 o_ocitem = (*jvm_env)->NewObject (jvm_env,
499 c_ocitem, m_ocitem_constructor, o_key);
500 if (o_ocitem == NULL)
502 ERROR ("java plugin: ctoj_oconfig_item: "
503 "Creating an OConfigItem object failed.");
504 (*jvm_env)->DeleteLocalRef (jvm_env, o_key);
508 /* We don't need the String object any longer.. */
509 (*jvm_env)->DeleteLocalRef (jvm_env, o_key);
511 /* Call OConfigItem.addValue for each value */
512 for (i = 0; i < ci->values_num; i++) /* {{{ */
516 o_value = ctoj_oconfig_value (jvm_env, ci->values[i]);
519 ERROR ("java plugin: ctoj_oconfig_item: "
520 "Creating an OConfigValue object failed.");
521 (*jvm_env)->DeleteLocalRef (jvm_env, o_ocitem);
525 (*jvm_env)->CallVoidMethod (jvm_env, o_ocitem, m_addvalue, o_value);
526 (*jvm_env)->DeleteLocalRef (jvm_env, o_value);
527 } /* }}} for (i = 0; i < ci->values_num; i++) */
529 /* Call OConfigItem.addChild for each child */
530 for (i = 0; i < ci->children_num; i++) /* {{{ */
534 o_child = ctoj_oconfig_item (jvm_env, ci->children + i);
537 ERROR ("java plugin: ctoj_oconfig_item: "
538 "Creating an OConfigItem object failed.");
539 (*jvm_env)->DeleteLocalRef (jvm_env, o_ocitem);
543 (*jvm_env)->CallVoidMethod (jvm_env, o_ocitem, m_addvalue, o_child);
544 (*jvm_env)->DeleteLocalRef (jvm_env, o_child);
545 } /* }}} for (i = 0; i < ci->children_num; i++) */
548 } /* }}} jobject ctoj_oconfig_item */
550 /* Convert a data_set_t to a java.util.List<DataSource> */
551 static jobject ctoj_data_set (JNIEnv *jvm_env, const data_set_t *ds) /* {{{ */
554 jmethodID m_constructor;
559 /* Look up the java.util.ArrayList class */
560 c_arraylist = (*jvm_env)->FindClass (jvm_env, "java.util.ArrayList");
561 if (c_arraylist == NULL)
563 ERROR ("java plugin: ctoj_data_set: Looking up the "
564 "java.util.ArrayList class failed.");
568 /* Search for the `ArrayList (int capacity)' constructor. */
569 m_constructor = (*jvm_env)->GetMethodID (jvm_env,
570 c_arraylist, "<init>", "()V");
571 if (m_constructor == NULL)
573 ERROR ("java plugin: ctoj_data_set: Looking up the "
574 "`ArrayList (void)' constructor failed.");
578 /* Search for the `boolean add (Object element)' method. */
579 m_add = (*jvm_env)->GetMethodID (jvm_env,
580 c_arraylist, "add", "(Ljava/lang/Object;)Z");
583 ERROR ("java plugin: ctoj_data_set: Looking up the "
584 "`add (Object)' method failed.");
588 o_dataset = (*jvm_env)->NewObject (jvm_env, c_arraylist, m_constructor);
589 if (o_dataset == NULL)
591 ERROR ("java plugin: ctoj_data_set: "
592 "Creating an ArrayList object failed.");
596 for (i = 0; i < ds->ds_num; i++)
598 jobject o_datasource;
601 o_datasource = ctoj_data_source (jvm_env, ds->ds + i);
602 if (o_datasource == NULL)
604 ERROR ("java plugin: ctoj_data_set: ctoj_data_source (%s.%s) failed",
605 ds->type, ds->ds[i].name);
606 (*jvm_env)->DeleteLocalRef (jvm_env, o_dataset);
610 status = (*jvm_env)->CallBooleanMethod (jvm_env,
611 o_dataset, m_add, o_datasource);
614 ERROR ("java plugin: ctoj_data_set: ArrayList.add returned FALSE.");
615 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
616 (*jvm_env)->DeleteLocalRef (jvm_env, o_dataset);
620 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
621 } /* for (i = 0; i < ds->ds_num; i++) */
624 } /* }}} jobject ctoj_data_set */
626 static int ctoj_value_list_add_value (JNIEnv *jvm_env, /* {{{ */
627 value_t value, int ds_type,
628 jclass class_ptr, jobject object_ptr)
630 jmethodID m_addvalue;
633 m_addvalue = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
634 "addValue", "(Ljava/lang/Number;)V");
635 if (m_addvalue == NULL)
637 ERROR ("java plugin: ctoj_value_list_add_value: "
638 "Cannot find method `void addValue (Number)'.");
642 o_number = ctoj_value_to_number (jvm_env, value, ds_type);
643 if (o_number == NULL)
645 ERROR ("java plugin: ctoj_value_list_add_value: "
646 "ctoj_value_to_number failed.");
650 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_addvalue, o_number);
652 (*jvm_env)->DeleteLocalRef (jvm_env, o_number);
655 } /* }}} int ctoj_value_list_add_value */
657 static int ctoj_value_list_add_data_set (JNIEnv *jvm_env, /* {{{ */
658 jclass c_valuelist, jobject o_valuelist, const data_set_t *ds)
660 jmethodID m_setdatasource;
663 /* Look for the `void setDataSource (List<DataSource> ds)' method. */
664 m_setdatasource = (*jvm_env)->GetMethodID (jvm_env, c_valuelist,
665 "setDataSource", "(Ljava/util/List;)V");
666 if (m_setdatasource == NULL)
668 ERROR ("java plugin: ctoj_value_list_add_data_set: "
669 "Cannot find the `void setDataSource (List<DataSource> ds)' method.");
673 /* Create a List<DataSource> object. */
674 o_dataset = ctoj_data_set (jvm_env, ds);
675 if (o_dataset == NULL)
677 ERROR ("java plugin: ctoj_value_list_add_data_set: "
678 "ctoj_data_set (%s) failed.", ds->type);
682 /* Actually call the method. */
683 (*jvm_env)->CallVoidMethod (jvm_env,
684 o_valuelist, m_setdatasource, o_dataset);
686 /* Decrease reference counter on the List<DataSource> object. */
687 (*jvm_env)->DeleteLocalRef (jvm_env, o_dataset);
690 } /* }}} int ctoj_value_list_add_data_set */
692 static jobject ctoj_value_list (JNIEnv *jvm_env, /* {{{ */
693 const data_set_t *ds, const value_list_t *vl)
696 jmethodID m_valuelist_constructor;
701 /* First, create a new ValueList instance..
702 * Look up the class.. */
703 c_valuelist = (*jvm_env)->FindClass (jvm_env,
704 "org.collectd.protocol.ValueList");
705 if (c_valuelist == NULL)
707 ERROR ("java plugin: ctoj_value_list: "
708 "FindClass (org.collectd.protocol.ValueList) failed.");
712 /* Lookup the `ValueList ()' constructor. */
713 m_valuelist_constructor = (*jvm_env)->GetMethodID (jvm_env, c_valuelist,
715 if (m_valuelist_constructor == NULL)
717 ERROR ("java plugin: ctoj_value_list: Cannot find the "
718 "`ValueList ()' constructor.");
722 /* Create a new instance. */
723 o_valuelist = (*jvm_env)->NewObject (jvm_env, c_valuelist,
724 m_valuelist_constructor);
725 if (o_valuelist == NULL)
727 ERROR ("java plugin: ctoj_value_list: Creating a new ValueList instance "
732 status = ctoj_value_list_add_data_set (jvm_env,
733 c_valuelist, o_valuelist, ds);
736 ERROR ("java plugin: ctoj_value_list: "
737 "ctoj_value_list_add_data_set failed.");
738 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist);
742 /* Set the strings.. */
743 #define SET_STRING(str,method_name) do { \
744 status = ctoj_string (jvm_env, str, \
745 c_valuelist, o_valuelist, method_name); \
747 ERROR ("java plugin: ctoj_value_list: jtoc_string (%s) failed.", \
749 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist); \
753 SET_STRING (vl->host, "setHost");
754 SET_STRING (vl->plugin, "setPlugin");
755 SET_STRING (vl->plugin_instance, "setPluginInstance");
756 SET_STRING (vl->type, "setType");
757 SET_STRING (vl->type_instance, "setTypeInstance");
761 /* Set the `time' member. Java stores time in milliseconds. */
762 status = ctoj_long (jvm_env, ((jlong) vl->time) * ((jlong) 1000),
763 c_valuelist, o_valuelist, "setTime");
766 ERROR ("java plugin: ctoj_value_list: ctoj_long (setTime) failed.");
767 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist);
771 /* Set the `interval' member.. */
772 status = ctoj_long (jvm_env, (jlong) vl->interval,
773 c_valuelist, o_valuelist, "setInterval");
776 ERROR ("java plugin: ctoj_value_list: ctoj_long (setInterval) failed.");
777 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist);
781 for (i = 0; i < vl->values_len; i++)
783 status = ctoj_value_list_add_value (jvm_env, vl->values[i], ds->ds[i].type,
784 c_valuelist, o_valuelist);
787 ERROR ("java plugin: ctoj_value_list: "
788 "ctoj_value_list_add_value failed.");
789 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist);
794 return (o_valuelist);
795 } /* }}} int ctoj_value_list */
798 * Java to C conversion functions
800 static int jtoc_string (JNIEnv *jvm_env, /* {{{ */
801 char *buffer, size_t buffer_size,
802 jclass class_ptr, jobject object_ptr, const char *method_name)
808 method_id = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
809 method_name, "()Ljava/lang/String;");
810 if (method_id == NULL)
812 ERROR ("java plugin: jtoc_string: Cannot find method `String %s ()'.",
817 string_obj = (*jvm_env)->CallObjectMethod (jvm_env, object_ptr, method_id);
818 if (string_obj == NULL)
820 ERROR ("java plugin: jtoc_string: CallObjectMethod (%s) failed.",
825 c_str = (*jvm_env)->GetStringUTFChars (jvm_env, string_obj, 0);
828 ERROR ("java plugin: jtoc_string: GetStringUTFChars failed.");
829 (*jvm_env)->DeleteLocalRef (jvm_env, string_obj);
833 DEBUG ("java plugin: jtoc_string: ->%s() = %s", method_name, c_str);
835 sstrncpy (buffer, c_str, buffer_size);
837 (*jvm_env)->ReleaseStringUTFChars (jvm_env, string_obj, c_str);
838 (*jvm_env)->DeleteLocalRef (jvm_env, string_obj);
841 } /* }}} int jtoc_string */
843 static int jtoc_long (JNIEnv *jvm_env, /* {{{ */
845 jclass class_ptr, jobject object_ptr, const char *method_name)
849 method_id = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
851 if (method_id == NULL)
853 ERROR ("java plugin: jtoc_long: Cannot find method `long %s ()'.",
858 *ret_value = (*jvm_env)->CallLongMethod (jvm_env, object_ptr, method_id);
860 DEBUG ("java plugin: jtoc_long: ->%s() = %li",
861 method_name, (long int) *ret_value);
864 } /* }}} int jtoc_long */
866 static int jtoc_double (JNIEnv *jvm_env, /* {{{ */
868 jclass class_ptr, jobject object_ptr, const char *method_name)
872 method_id = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
874 if (method_id == NULL)
876 ERROR ("java plugin: jtoc_string: Cannot find method `double %s ()'.",
881 *ret_value = (*jvm_env)->CallDoubleMethod (jvm_env, object_ptr, method_id);
883 DEBUG ("java plugin: jtoc_double: ->%s() = %g",
884 method_name, (double) *ret_value);
887 } /* }}} int jtoc_double */
889 static int jtoc_value (JNIEnv *jvm_env, /* {{{ */
890 value_t *ret_value, int ds_type, jobject object_ptr)
895 class_ptr = (*jvm_env)->GetObjectClass (jvm_env, object_ptr);
897 if (ds_type == DS_TYPE_COUNTER)
901 status = jtoc_long (jvm_env, &tmp_long,
902 class_ptr, object_ptr, "longValue");
905 ERROR ("java plugin: jtoc_value: "
906 "jtoc_long failed.");
909 (*ret_value).counter = (counter_t) tmp_long;
915 status = jtoc_double (jvm_env, &tmp_double,
916 class_ptr, object_ptr, "doubleValue");
919 ERROR ("java plugin: jtoc_value: "
920 "jtoc_double failed.");
923 (*ret_value).gauge = (gauge_t) tmp_double;
927 } /* }}} int jtoc_value */
929 static int jtoc_values_array (JNIEnv *jvm_env, /* {{{ */
930 const data_set_t *ds, value_list_t *vl,
931 jclass class_ptr, jobject object_ptr)
933 jmethodID m_getvalues;
936 jobjectArray o_number_array;
942 values_num = ds->ds_num;
945 o_number_array = NULL;
948 #define BAIL_OUT(status) \
950 if (o_number_array != NULL) \
951 (*jvm_env)->DeleteLocalRef (jvm_env, o_number_array); \
952 if (o_list != NULL) \
953 (*jvm_env)->DeleteLocalRef (jvm_env, o_list); \
956 /* Call: List<Number> ValueList.getValues () */
957 m_getvalues = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
958 "getValues", "()Ljava/util/List;");
959 if (m_getvalues == NULL)
961 ERROR ("java plugin: jtoc_values_array: "
962 "Cannot find method `List getValues ()'.");
966 o_list = (*jvm_env)->CallObjectMethod (jvm_env, object_ptr, m_getvalues);
969 ERROR ("java plugin: jtoc_values_array: "
970 "CallObjectMethod (getValues) failed.");
974 /* Call: Number[] List.toArray () */
975 m_toarray = (*jvm_env)->GetMethodID (jvm_env,
976 (*jvm_env)->GetObjectClass (jvm_env, o_list),
977 "toArray", "()[Ljava/lang/Object;");
978 if (m_toarray == NULL)
980 ERROR ("java plugin: jtoc_values_array: "
981 "Cannot find method `Object[] toArray ()'.");
985 o_number_array = (*jvm_env)->CallObjectMethod (jvm_env, o_list, m_toarray);
986 if (o_number_array == NULL)
988 ERROR ("java plugin: jtoc_values_array: "
989 "CallObjectMethod (toArray) failed.");
993 values = calloc (values_num, sizeof (value_t));
996 ERROR ("java plugin: jtoc_values_array: calloc failed.");
1000 for (i = 0; i < values_num; i++)
1005 o_number = (*jvm_env)->GetObjectArrayElement (jvm_env,
1006 o_number_array, (jsize) i);
1007 if (o_number == NULL)
1009 ERROR ("java plugin: jtoc_values_array: "
1010 "GetObjectArrayElement (%i) failed.", i);
1014 status = jtoc_value (jvm_env, values + i, ds->ds[i].type, o_number);
1017 ERROR ("java plugin: jtoc_values_array: "
1018 "jtoc_value (%i) failed.", i);
1021 } /* for (i = 0; i < values_num; i++) */
1023 vl->values = values;
1024 vl->values_len = values_num;
1027 (*jvm_env)->DeleteLocalRef (jvm_env, o_number_array);
1028 (*jvm_env)->DeleteLocalRef (jvm_env, o_list);
1030 } /* }}} int jtoc_values_array */
1032 /* Convert a org.collectd.protocol.ValueList to a value_list_t. */
1033 static int jtoc_value_list (JNIEnv *jvm_env, value_list_t *vl, /* {{{ */
1039 const data_set_t *ds;
1041 class_ptr = (*jvm_env)->GetObjectClass (jvm_env, object_ptr);
1042 if (class_ptr == NULL)
1044 ERROR ("java plugin: jtoc_value_list: GetObjectClass failed.");
1048 #define SET_STRING(buffer,method) do { \
1049 status = jtoc_string (jvm_env, buffer, sizeof (buffer), \
1050 class_ptr, object_ptr, method); \
1051 if (status != 0) { \
1052 ERROR ("java plugin: jtoc_value_list: jtoc_string (%s) failed.", \
1057 SET_STRING(vl->type, "getType");
1059 ds = plugin_get_ds (vl->type);
1062 ERROR ("java plugin: jtoc_value_list: Data-set `%s' is not defined. "
1063 "Please consult the types.db(5) manpage for mor information.",
1068 SET_STRING(vl->host, "getHost");
1069 SET_STRING(vl->plugin, "getPlugin");
1070 SET_STRING(vl->plugin_instance, "getPluginInstance");
1071 SET_STRING(vl->type_instance, "getTypeInstance");
1075 status = jtoc_long (jvm_env, &tmp_long, class_ptr, object_ptr, "getTime");
1078 ERROR ("java plugin: jtoc_value_list: jtoc_long (getTime) failed.");
1081 vl->time = (time_t) tmp_long;
1083 status = jtoc_long (jvm_env, &tmp_long,
1084 class_ptr, object_ptr, "getInterval");
1087 ERROR ("java plugin: jtoc_value_list: jtoc_long (getInterval) failed.");
1090 vl->interval = (int) tmp_long;
1092 status = jtoc_values_array (jvm_env, ds, vl, class_ptr, object_ptr);
1095 ERROR ("java plugin: jtoc_value_list: jtoc_values_array failed.");
1100 } /* }}} int jtoc_value_list */
1103 * Functions accessible from Java
1105 static jint JNICALL cjni_api_dispatch_values (JNIEnv *jvm_env, /* {{{ */
1106 jobject this, jobject java_vl)
1108 value_list_t vl = VALUE_LIST_INIT;
1111 DEBUG ("cjni_api_dispatch_values: java_vl = %p;", (void *) java_vl);
1113 status = jtoc_value_list (jvm_env, &vl, java_vl);
1116 ERROR ("java plugin: cjni_api_dispatch_values: jtoc_value_list failed.");
1120 status = plugin_dispatch_values (&vl);
1125 } /* }}} jint cjni_api_dispatch_values */
1127 static JNINativeMethod jni_api_functions[] =
1129 { "DispatchValues", "(Lorg/collectd/protocol/ValueList;)I", cjni_api_dispatch_values }
1131 static size_t jni_api_functions_num = sizeof (jni_api_functions)
1132 / sizeof (jni_api_functions[0]);
1137 static int cjni_config_add_jvm_arg (oconfig_item_t *ci) /* {{{ */
1141 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
1143 WARNING ("java plugin: `JVMArg' needs exactly one string argument.");
1147 tmp = (char **) realloc (jvm_argv, sizeof (char *) * (jvm_argc + 1));
1150 ERROR ("java plugin: realloc failed.");
1155 jvm_argv[jvm_argc] = strdup (ci->values[0].value.string);
1156 if (jvm_argv[jvm_argc] == NULL)
1158 ERROR ("java plugin: strdup failed.");
1164 } /* }}} int cjni_config_add_jvm_arg */
1166 static int cjni_config_load_plugin (oconfig_item_t *ci) /* {{{ */
1170 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
1172 WARNING ("java plugin: `LoadPlugin' needs exactly one string argument.");
1176 jp = (java_plugin_t *) realloc (java_plugins,
1177 sizeof (*java_plugins) * (java_plugins_num + 1));
1180 ERROR ("java plugin: realloc failed.");
1184 jp = java_plugins + java_plugins_num;
1186 memset (jp, 0, sizeof (*jp));
1187 jp->class_name = strdup (ci->values[0].value.string);
1188 if (jp->class_name == NULL)
1190 ERROR ("java plugin: strdup failed.");
1194 jp->class_ptr = NULL;
1195 jp->object_ptr = NULL;
1198 jp->m_config = NULL;
1202 jp->m_shutdown = NULL;
1207 } /* }}} int cjni_config_load_plugin */
1209 static int cjni_config_plugin_block (oconfig_item_t *ci) /* {{{ */
1212 const char *class_name;
1214 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
1216 WARNING ("java plugin: `Plugin' blocks "
1217 "need exactly one string argument.");
1221 class_name = ci->values[0].value.string;
1222 for (i = 0; i < java_plugins_num; i++)
1223 if (strcmp (java_plugins[i].class_name, class_name) == 0)
1226 if (i >= java_plugins_num)
1228 WARNING ("java plugin: Configuration block for the `%s' plugin found, "
1229 "but the plugin has not been loaded. Please note, that the class "
1230 "name is case-sensitive!",
1235 if (java_plugins[i].ci != NULL)
1237 WARNING ("java plugin: There are more than one <Plugin> blocks for the "
1238 "`%s' plugin. This is currently not supported - only the first block "
1244 java_plugins[i].ci = oconfig_clone (ci);
1245 if (java_plugins[i].ci == NULL)
1247 ERROR ("java plugin: cjni_config_plugin_block: "
1248 "oconfig_clone failed for `%s'.",
1253 DEBUG ("java plugin: cjni_config_plugin_block: "
1254 "Successfully copied config for `%s'.",
1258 } /* }}} int cjni_config_plugin_block */
1260 static int cjni_config (oconfig_item_t *ci) /* {{{ */
1270 for (i = 0; i < ci->children_num; i++)
1272 oconfig_item_t *child = ci->children + i;
1274 if (strcasecmp ("JVMArg", child->key) == 0)
1276 status = cjni_config_add_jvm_arg (child);
1282 else if (strcasecmp ("LoadPlugin", child->key) == 0)
1284 status = cjni_config_load_plugin (child);
1290 else if (strcasecmp ("Plugin", child->key) == 0)
1292 status = cjni_config_plugin_block (child);
1300 WARNING ("java plugin: Option `%s' not allowed here.", child->key);
1305 if ((success == 0) && (errors > 0))
1307 ERROR ("java plugin: All statements failed.");
1312 } /* }}} int cjni_config */
1314 static int cjni_init_one_plugin (JNIEnv *jvm_env, java_plugin_t *jp) /* {{{ */
1316 jmethodID constructor_id;
1319 jp->class_ptr = (*jvm_env)->FindClass (jvm_env, jp->class_name);
1320 if (jp->class_ptr == NULL)
1322 ERROR ("cjni_init_one_plugin: FindClass (%s) failed.",
1327 constructor_id = (*jvm_env)->GetMethodID (jvm_env, jp->class_ptr,
1329 if (constructor_id == NULL)
1331 ERROR ("cjni_init_one_plugin: Could not find the constructor for `%s'.",
1336 jp->object_ptr = (*jvm_env)->NewObject (jvm_env, jp->class_ptr,
1338 if (jp->object_ptr == NULL)
1340 ERROR ("cjni_init_one_plugin: Could create a new `%s' object.",
1345 jp->m_config = (*jvm_env)->GetMethodID (jvm_env, jp->class_ptr,
1346 "Config", "(Lorg/collectd/api/OConfigItem;)I");
1347 DEBUG ("java plugin: cjni_init_one_plugin: "
1348 "jp->class_name = %s; jp->m_config = %p;",
1349 jp->class_name, (void *) jp->m_config);
1351 jp->m_init = (*jvm_env)->GetMethodID (jvm_env, jp->class_ptr,
1353 DEBUG ("java plugin: cjni_init_one_plugin: "
1354 "jp->class_name = %s; jp->m_init = %p;",
1355 jp->class_name, (void *) jp->m_init);
1357 jp->m_read = (*jvm_env)->GetMethodID (jvm_env, jp->class_ptr,
1359 DEBUG ("java plugin: cjni_init_one_plugin: "
1360 "jp->class_name = %s; jp->m_read = %p;",
1361 jp->class_name, (void *) jp->m_read);
1363 jp->m_write = (*jvm_env)->GetMethodID (jvm_env, jp->class_ptr,
1364 "Write", "(Lorg/collectd/protocol/ValueList;)I");
1365 DEBUG ("java plugin: cjni_init_one_plugin: "
1366 "jp->class_name = %s; jp->m_write = %p;",
1367 jp->class_name, (void *) jp->m_write);
1369 jp->m_shutdown = (*jvm_env)->GetMethodID (jvm_env, jp->class_ptr,
1371 DEBUG ("java plugin: cjni_init_one_plugin: "
1372 "jp->class_name = %s; jp->m_shutdown = %p;",
1373 jp->class_name, (void *) jp->m_shutdown);
1377 if (jp->m_config == NULL)
1379 WARNING ("java plugin: Configuration for the `%s' plugin is present, "
1380 "but plugin doesn't provide a configuration method.",
1387 o_ocitem = ctoj_oconfig_item (jvm_env, jp->ci);
1388 if (o_ocitem == NULL)
1390 ERROR ("java plugin: Creating an OConfigItem object failed. "
1391 "Can't pass configuration information to the `%s' plugin!",
1396 status = (*jvm_env)->CallIntMethod (jvm_env,
1397 jp->object_ptr, jp->m_config, o_ocitem);
1400 ERROR ("java plugin: cjni_init_one_plugin: "
1401 "Configuring the `%s' object failed with status %i.",
1402 jp->class_name, status);
1404 (*jvm_env)->DeleteLocalRef (jvm_env, o_ocitem);
1407 } /* if (jp->ci != NULL) */
1409 if (jp->m_init != NULL)
1411 status = (*jvm_env)->CallIntMethod (jvm_env, jp->object_ptr,
1415 ERROR ("java plugin: cjni_init_one_plugin: "
1416 "Initializing `%s' object failed with status %i.",
1417 jp->class_name, status);
1421 jp->flags |= CJNI_FLAG_ENABLED;
1424 } /* }}} int cjni_init_one_plugin */
1426 static int cjni_init_plugins (JNIEnv *jvm_env) /* {{{ */
1430 for (j = 0; j < java_plugins_num; j++)
1431 cjni_init_one_plugin (jvm_env, &java_plugins[j]);
1434 } /* }}} int cjni_init_plugins */
1436 static int cjni_init_native (JNIEnv *jvm_env) /* {{{ */
1438 jclass api_class_ptr;
1441 api_class_ptr = (*jvm_env)->FindClass (jvm_env, "org.collectd.api.CollectdAPI");
1442 if (api_class_ptr == NULL)
1444 ERROR ("cjni_init_native: Cannot find API class `org.collectd.api.CollectdAPI'.");
1448 status = (*jvm_env)->RegisterNatives (jvm_env, api_class_ptr,
1449 jni_api_functions, (jint) jni_api_functions_num);
1452 ERROR ("cjni_init_native: RegisterNatives failed with status %i.", status);
1457 } /* }}} int cjni_init_native */
1459 static int cjni_init (void) /* {{{ */
1462 JavaVMInitArgs vm_args;
1463 JavaVMOption vm_options[jvm_argc];
1473 memset (&vm_args, 0, sizeof (vm_args));
1474 vm_args.version = JNI_VERSION_1_2;
1475 vm_args.options = vm_options;
1476 vm_args.nOptions = (jint) jvm_argc;
1478 for (i = 0; i < jvm_argc; i++)
1480 DEBUG ("java plugin: cjni_init: jvm_argv[%zu] = %s", i, jvm_argv[i]);
1481 vm_args.options[i].optionString = jvm_argv[i];
1484 vm_args.options[0].optionString = "-verbose:jni";
1485 vm_args.options[1].optionString = "-Djava.class.path=/home/octo/collectd/bindings/java";
1488 status = JNI_CreateJavaVM (&jvm, (void **) &jvm_env, (void **) &vm_args);
1491 ERROR ("cjni_init: JNI_CreateJavaVM failed with status %i.",
1495 assert (jvm != NULL);
1496 assert (jvm_env != NULL);
1498 /* Call RegisterNatives */
1499 status = cjni_init_native (jvm_env);
1502 ERROR ("cjni_init: cjni_init_native failed.");
1506 cjni_init_plugins (jvm_env);
1509 } /* }}} int cjni_init */
1511 static int cjni_read_one_plugin (JNIEnv *jvm_env, java_plugin_t *jp) /* {{{ */
1516 || ((jp->flags & CJNI_FLAG_ENABLED) == 0)
1517 || (jp->m_read == NULL))
1520 DEBUG ("java plugin: Calling: %s.Read()", jp->class_name);
1522 status = (*jvm_env)->CallIntMethod (jvm_env, jp->object_ptr,
1526 ERROR ("java plugin: cjni_read_one_plugin: "
1527 "Calling `Read' on an `%s' object failed with status %i.",
1528 jp->class_name, status);
1533 } /* }}} int cjni_read_one_plugin */
1535 static int cjni_read_plugins (JNIEnv *jvm_env) /* {{{ */
1539 for (j = 0; j < java_plugins_num; j++)
1540 cjni_read_one_plugin (jvm_env, &java_plugins[j]);
1543 } /* }}} int cjni_read_plugins */
1545 static int cjni_read (void) /* {{{ */
1548 JavaVMAttachArgs args;
1553 ERROR ("java plugin: cjni_read: jvm == NULL");
1558 memset (&args, 0, sizeof (args));
1559 args.version = JNI_VERSION_1_2;
1561 status = (*jvm)->AttachCurrentThread (jvm, (void **) &jvm_env, &args);
1564 ERROR ("java plugin: cjni_read: AttachCurrentThread failed with status %i.",
1569 cjni_read_plugins (jvm_env);
1571 status = (*jvm)->DetachCurrentThread (jvm);
1574 ERROR ("java plugin: cjni_read: DetachCurrentThread failed with status %i.",
1580 } /* }}} int cjni_read */
1582 static int cjni_write_one_plugin (JNIEnv *jvm_env, /* {{{ */
1583 java_plugin_t *jp, jobject vl_java)
1588 || ((jp->flags & CJNI_FLAG_ENABLED) == 0)
1589 || (jp->m_write == NULL))
1592 DEBUG ("java plugin: Calling: %s.Write(ValueList)", jp->class_name);
1594 status = (*jvm_env)->CallIntMethod (jvm_env, jp->object_ptr,
1595 jp->m_write, vl_java);
1598 ERROR ("java plugin: cjni_write_one_plugin: "
1599 "Calling `Write' on an `%s' object failed with status %i.",
1600 jp->class_name, status);
1605 } /* }}} int cjni_write_one_plugin */
1607 static int cjni_write_plugins (JNIEnv *jvm_env, /* {{{ */
1608 const data_set_t *ds, const value_list_t *vl)
1614 vl_java = ctoj_value_list (jvm_env, ds, vl);
1615 if (vl_java == NULL)
1617 ERROR ("java plugin: cjni_write_plugins: ctoj_value_list failed.");
1621 for (j = 0; j < java_plugins_num; j++)
1622 cjni_write_one_plugin (jvm_env, &java_plugins[j], vl_java);
1624 (*jvm_env)->DeleteLocalRef (jvm_env, vl_java);
1627 } /* }}} int cjni_write_plugins */
1629 static int cjni_write (const data_set_t *ds, const value_list_t *vl) /* {{{ */
1632 JavaVMAttachArgs args;
1637 ERROR ("java plugin: cjni_write: jvm == NULL");
1642 memset (&args, 0, sizeof (args));
1643 args.version = JNI_VERSION_1_2;
1645 status = (*jvm)->AttachCurrentThread (jvm, (void **) &jvm_env, &args);
1648 ERROR ("java plugin: cjni_write: AttachCurrentThread failed with status %i.",
1653 cjni_write_plugins (jvm_env, ds, vl);
1655 status = (*jvm)->DetachCurrentThread (jvm);
1658 ERROR ("java plugin: cjni_write: DetachCurrentThread failed with status %i.",
1664 } /* }}} int cjni_write */
1666 static int cjni_shutdown_one_plugin (JNIEnv *jvm_env, /* {{{ */
1672 || ((jp->flags & CJNI_FLAG_ENABLED) == 0)
1673 || (jp->m_shutdown == NULL))
1676 status = (*jvm_env)->CallIntMethod (jvm_env, jp->object_ptr,
1680 ERROR ("cjni_shutdown_one_plugin: Destroying an `%s' object failed "
1681 "with status %i.", jp->class_name, status);
1684 jp->flags &= ~CJNI_FLAG_ENABLED;
1687 } /* }}} int cjni_shutdown_one_plugin */
1689 static int cjni_shutdown_plugins (JNIEnv *jvm_env) /* {{{ */
1693 for (j = 0; j < java_plugins_num; j++)
1694 cjni_shutdown_one_plugin (jvm_env, &java_plugins[j]);
1697 } /* }}} int cjni_shutdown_plugins */
1699 static int cjni_shutdown (void) /* {{{ */
1702 JavaVMAttachArgs args;
1710 memset (&args, 0, sizeof (args));
1711 args.version = JNI_VERSION_1_2;
1713 status = (*jvm)->AttachCurrentThread (jvm, (void **) &jvm_env, &args);
1716 ERROR ("java plugin: cjni_read: AttachCurrentThread failed with status %i.",
1721 cjni_shutdown_plugins (jvm_env);
1723 (*jvm)->DestroyJavaVM (jvm);
1727 for (i = 0; i < jvm_argc; i++)
1729 sfree (jvm_argv[i]);
1734 for (i = 0; i < java_plugins_num; i++)
1736 sfree (java_plugins[i].class_name);
1737 oconfig_free (java_plugins[i].ci);
1739 sfree (java_plugins);
1740 java_plugins_num = 0;
1743 } /* }}} int cjni_shutdown */
1745 void module_register (void)
1747 plugin_register_complex_config ("java", cjni_config);
1748 plugin_register_init ("java", cjni_init);
1749 plugin_register_read ("java", cjni_read);
1750 plugin_register_write ("java", cjni_write);
1751 plugin_register_shutdown ("java", cjni_shutdown);
1752 } /* void module_register (void) */
1754 /* vim: set sw=2 sts=2 et fdm=marker : */