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 cjni_jvm_env_s /* {{{ */
41 int reference_counter;
43 typedef struct cjni_jvm_env_s cjni_jvm_env_t;
46 struct java_plugin_class_s /* {{{ */
52 typedef struct java_plugin_class_s java_plugin_class_t;
55 struct java_plugin_config_s /* {{{ */
60 typedef struct java_plugin_config_s java_plugin_config_t;
63 #define CB_TYPE_CONFIG 1
64 #define CB_TYPE_INIT 2
65 #define CB_TYPE_READ 3
66 #define CB_TYPE_WRITE 4
67 #define CB_TYPE_SHUTDOWN 5
68 struct cjni_callback_info_s /* {{{ */
76 typedef struct cjni_callback_info_s cjni_callback_info_t;
82 static JavaVM *jvm = NULL;
83 static pthread_key_t jvm_env_key;
85 /* Configuration options for the JVM. */
86 static char **jvm_argv = NULL;
87 static size_t jvm_argc = 0;
89 /* List of class names to load */
90 static java_plugin_class_t *java_classes_list = NULL;
91 static size_t java_classes_list_len;
93 /* List of `config_item_t's for Java plugins */
94 static java_plugin_config_t *java_plugin_configs = NULL;
95 static size_t java_plugin_configs_num = 0;
97 /* List of config, init, and shutdown callbacks. */
98 static cjni_callback_info_t *java_callbacks = NULL;
99 static size_t java_callbacks_num = 0;
100 static pthread_mutex_t java_callbacks_lock = PTHREAD_MUTEX_INITIALIZER;
105 * Mostly functions that are needed by the Java interface (``native'')
108 static void cjni_callback_info_destroy (void *arg);
109 static cjni_callback_info_t *cjni_callback_info_create (JNIEnv *jvm_env,
110 jobject o_name, jobject o_callback, int type);
111 static int cjni_callback_register (JNIEnv *jvm_env, jobject o_name,
112 jobject o_callback, int type);
113 static int cjni_read (user_data_t *user_data);
114 static int cjni_write (const data_set_t *ds, const value_list_t *vl,
118 * C to Java conversion functions
120 static int ctoj_string (JNIEnv *jvm_env, /* {{{ */
122 jclass class_ptr, jobject object_ptr, const char *method_name)
127 /* Create a java.lang.String */
128 o_string = (*jvm_env)->NewStringUTF (jvm_env,
129 (string != NULL) ? string : "");
130 if (o_string == NULL)
132 ERROR ("java plugin: ctoj_string: NewStringUTF failed.");
136 /* Search for the `void setFoo (String s)' method. */
137 m_set = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
138 method_name, "(Ljava/lang/String;)V");
141 ERROR ("java plugin: ctoj_string: Cannot find method `void %s (String)'.",
143 (*jvm_env)->DeleteLocalRef (jvm_env, o_string);
147 /* Call the method. */
148 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_set, o_string);
150 /* Decrease reference counter on the java.lang.String object. */
151 (*jvm_env)->DeleteLocalRef (jvm_env, o_string);
154 } /* }}} int ctoj_string */
156 static int ctoj_int (JNIEnv *jvm_env, /* {{{ */
158 jclass class_ptr, jobject object_ptr, const char *method_name)
162 /* Search for the `void setFoo (int i)' method. */
163 m_set = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
164 method_name, "(I)V");
167 ERROR ("java plugin: ctoj_int: Cannot find method `void %s (int)'.",
172 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_set, value);
175 } /* }}} int ctoj_int */
177 static int ctoj_long (JNIEnv *jvm_env, /* {{{ */
179 jclass class_ptr, jobject object_ptr, const char *method_name)
183 /* Search for the `void setFoo (long l)' method. */
184 m_set = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
185 method_name, "(J)V");
188 ERROR ("java plugin: ctoj_long: Cannot find method `void %s (long)'.",
193 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_set, value);
196 } /* }}} int ctoj_long */
198 static int ctoj_double (JNIEnv *jvm_env, /* {{{ */
200 jclass class_ptr, jobject object_ptr, const char *method_name)
204 /* Search for the `void setFoo (double d)' method. */
205 m_set = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
206 method_name, "(D)V");
209 ERROR ("java plugin: ctoj_double: Cannot find method `void %s (double)'.",
214 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_set, value);
217 } /* }}} int ctoj_double */
219 /* Convert a jlong to a java.lang.Number */
220 static jobject ctoj_jlong_to_number (JNIEnv *jvm_env, jlong value) /* {{{ */
223 jmethodID m_long_constructor;
225 /* Look up the java.lang.Long class */
226 c_long = (*jvm_env)->FindClass (jvm_env, "java.lang.Long");
229 ERROR ("java plugin: ctoj_jlong_to_number: Looking up the "
230 "java.lang.Long class failed.");
234 m_long_constructor = (*jvm_env)->GetMethodID (jvm_env,
235 c_long, "<init>", "(J)V");
236 if (m_long_constructor == NULL)
238 ERROR ("java plugin: ctoj_jlong_to_number: Looking up the "
239 "`Long (long)' constructor failed.");
243 return ((*jvm_env)->NewObject (jvm_env,
244 c_long, m_long_constructor, value));
245 } /* }}} jobject ctoj_jlong_to_number */
247 /* Convert a jdouble to a java.lang.Number */
248 static jobject ctoj_jdouble_to_number (JNIEnv *jvm_env, jdouble value) /* {{{ */
251 jmethodID m_double_constructor;
253 /* Look up the java.lang.Long class */
254 c_double = (*jvm_env)->FindClass (jvm_env, "java.lang.Double");
255 if (c_double == NULL)
257 ERROR ("java plugin: ctoj_jdouble_to_number: Looking up the "
258 "java.lang.Double class failed.");
262 m_double_constructor = (*jvm_env)->GetMethodID (jvm_env,
263 c_double, "<init>", "(D)V");
264 if (m_double_constructor == NULL)
266 ERROR ("java plugin: ctoj_jdouble_to_number: Looking up the "
267 "`Double (double)' constructor failed.");
271 return ((*jvm_env)->NewObject (jvm_env,
272 c_double, m_double_constructor, value));
273 } /* }}} jobject ctoj_jdouble_to_number */
275 /* Convert a value_t to a java.lang.Number */
276 static jobject ctoj_value_to_number (JNIEnv *jvm_env, /* {{{ */
277 value_t value, int ds_type)
279 if (ds_type == DS_TYPE_COUNTER)
280 return (ctoj_jlong_to_number (jvm_env, (jlong) value.counter));
281 else if (ds_type == DS_TYPE_GAUGE)
282 return (ctoj_jdouble_to_number (jvm_env, (jdouble) value.gauge));
285 } /* }}} jobject ctoj_value_to_number */
287 /* Convert a data_source_t to a org.collectd.api.DataSource */
288 static jobject ctoj_data_source (JNIEnv *jvm_env, /* {{{ */
289 const data_source_t *dsrc)
292 jmethodID m_datasource_constructor;
293 jobject o_datasource;
296 /* Look up the DataSource class */
297 c_datasource = (*jvm_env)->FindClass (jvm_env,
298 "org.collectd.api.DataSource");
299 if (c_datasource == NULL)
301 ERROR ("java plugin: ctoj_data_source: "
302 "FindClass (org.collectd.api.DataSource) failed.");
306 /* Lookup the `ValueList ()' constructor. */
307 m_datasource_constructor = (*jvm_env)->GetMethodID (jvm_env, c_datasource,
309 if (m_datasource_constructor == NULL)
311 ERROR ("java plugin: ctoj_data_source: Cannot find the "
312 "`DataSource ()' constructor.");
316 /* Create a new instance. */
317 o_datasource = (*jvm_env)->NewObject (jvm_env, c_datasource,
318 m_datasource_constructor);
319 if (o_datasource == NULL)
321 ERROR ("java plugin: ctoj_data_source: "
322 "Creating a new DataSource instance failed.");
326 /* Set name via `void setName (String name)' */
327 status = ctoj_string (jvm_env, dsrc->name,
328 c_datasource, o_datasource, "setName");
331 ERROR ("java plugin: ctoj_data_source: "
332 "ctoj_string (setName) failed.");
333 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
337 /* Set type via `void setType (int type)' */
338 status = ctoj_int (jvm_env, dsrc->type,
339 c_datasource, o_datasource, "setType");
342 ERROR ("java plugin: ctoj_data_source: "
343 "ctoj_int (setType) failed.");
344 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
348 /* Set min via `void setMin (double min)' */
349 status = ctoj_double (jvm_env, dsrc->min,
350 c_datasource, o_datasource, "setMin");
353 ERROR ("java plugin: ctoj_data_source: "
354 "ctoj_double (setMin) failed.");
355 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
359 /* Set max via `void setMax (double max)' */
360 status = ctoj_double (jvm_env, dsrc->max,
361 c_datasource, o_datasource, "setMax");
364 ERROR ("java plugin: ctoj_data_source: "
365 "ctoj_double (setMax) failed.");
366 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
370 return (o_datasource);
371 } /* }}} jobject ctoj_data_source */
373 /* Convert a oconfig_value_t to a org.collectd.api.OConfigValue */
374 static jobject ctoj_oconfig_value (JNIEnv *jvm_env, /* {{{ */
375 oconfig_value_t ocvalue)
378 jmethodID m_ocvalue_constructor;
382 m_ocvalue_constructor = NULL;
385 c_ocvalue = (*jvm_env)->FindClass (jvm_env,
386 "org.collectd.api.OConfigValue");
387 if (c_ocvalue == NULL)
389 ERROR ("java plugin: ctoj_oconfig_value: "
390 "FindClass (org.collectd.api.OConfigValue) failed.");
394 if (ocvalue.type == OCONFIG_TYPE_BOOLEAN)
396 jboolean tmp_boolean;
398 tmp_boolean = (ocvalue.value.boolean == 0) ? JNI_FALSE : JNI_TRUE;
400 m_ocvalue_constructor = (*jvm_env)->GetMethodID (jvm_env, c_ocvalue,
402 if (m_ocvalue_constructor == NULL)
404 ERROR ("java plugin: ctoj_oconfig_value: Cannot find the "
405 "`OConfigValue (boolean)' constructor.");
409 return ((*jvm_env)->NewObject (jvm_env,
410 c_ocvalue, m_ocvalue_constructor, tmp_boolean));
411 } /* if (ocvalue.type == OCONFIG_TYPE_BOOLEAN) */
412 else if (ocvalue.type == OCONFIG_TYPE_STRING)
414 m_ocvalue_constructor = (*jvm_env)->GetMethodID (jvm_env, c_ocvalue,
415 "<init>", "(Ljava/lang/String;)V");
416 if (m_ocvalue_constructor == NULL)
418 ERROR ("java plugin: ctoj_oconfig_value: Cannot find the "
419 "`OConfigValue (String)' constructor.");
423 o_argument = (*jvm_env)->NewStringUTF (jvm_env, ocvalue.value.string);
424 if (o_argument == NULL)
426 ERROR ("java plugin: ctoj_oconfig_value: "
427 "Creating a String object failed.");
431 else if (ocvalue.type == OCONFIG_TYPE_NUMBER)
433 m_ocvalue_constructor = (*jvm_env)->GetMethodID (jvm_env, c_ocvalue,
434 "<init>", "(Ljava/lang/Number;)V");
435 if (m_ocvalue_constructor == NULL)
437 ERROR ("java plugin: ctoj_oconfig_value: Cannot find the "
438 "`OConfigValue (Number)' constructor.");
442 o_argument = ctoj_jdouble_to_number (jvm_env,
443 (jdouble) ocvalue.value.number);
444 if (o_argument == NULL)
446 ERROR ("java plugin: ctoj_oconfig_value: "
447 "Creating a Number object failed.");
456 assert (m_ocvalue_constructor != NULL);
457 assert (o_argument != NULL);
459 o_ocvalue = (*jvm_env)->NewObject (jvm_env,
460 c_ocvalue, m_ocvalue_constructor, o_argument);
461 if (o_ocvalue == NULL)
463 ERROR ("java plugin: ctoj_oconfig_value: "
464 "Creating an OConfigValue object failed.");
465 (*jvm_env)->DeleteLocalRef (jvm_env, o_argument);
469 (*jvm_env)->DeleteLocalRef (jvm_env, o_argument);
471 } /* }}} jobject ctoj_oconfig_value */
473 /* Convert a oconfig_item_t to a org.collectd.api.OConfigItem */
474 static jobject ctoj_oconfig_item (JNIEnv *jvm_env, /* {{{ */
475 const oconfig_item_t *ci)
478 jmethodID m_ocitem_constructor;
479 jmethodID m_addvalue;
480 jmethodID m_addchild;
485 c_ocitem = (*jvm_env)->FindClass (jvm_env, "org.collectd.api.OConfigItem");
486 if (c_ocitem == NULL)
488 ERROR ("java plugin: ctoj_oconfig_item: "
489 "FindClass (org.collectd.api.OConfigItem) failed.");
493 /* Get the required methods: m_ocitem_constructor, m_addvalue, and m_addchild
495 m_ocitem_constructor = (*jvm_env)->GetMethodID (jvm_env, c_ocitem,
496 "<init>", "(Ljava/lang/String;)V");
497 if (m_ocitem_constructor == NULL)
499 ERROR ("java plugin: ctoj_oconfig_item: Cannot find the "
500 "`OConfigItem (String)' constructor.");
504 m_addvalue = (*jvm_env)->GetMethodID (jvm_env, c_ocitem,
505 "addValue", "(Lorg/collectd/api/OConfigValue;)V");
506 if (m_addvalue == NULL)
508 ERROR ("java plugin: ctoj_oconfig_item: Cannot find the "
509 "`addValue (OConfigValue)' method.");
513 m_addchild = (*jvm_env)->GetMethodID (jvm_env, c_ocitem,
514 "addChild", "(Lorg/collectd/api/OConfigItem;)V");
515 if (m_addchild == NULL)
517 ERROR ("java plugin: ctoj_oconfig_item: Cannot find the "
518 "`addChild (OConfigItem)' method.");
523 /* Create a String object with the key.
524 * Needed for calling the constructor. */
525 o_key = (*jvm_env)->NewStringUTF (jvm_env, ci->key);
528 ERROR ("java plugin: ctoj_oconfig_item: "
529 "Creating String object failed.");
533 /* Create an OConfigItem object */
534 o_ocitem = (*jvm_env)->NewObject (jvm_env,
535 c_ocitem, m_ocitem_constructor, o_key);
536 if (o_ocitem == NULL)
538 ERROR ("java plugin: ctoj_oconfig_item: "
539 "Creating an OConfigItem object failed.");
540 (*jvm_env)->DeleteLocalRef (jvm_env, o_key);
544 /* We don't need the String object any longer.. */
545 (*jvm_env)->DeleteLocalRef (jvm_env, o_key);
547 /* Call OConfigItem.addValue for each value */
548 for (i = 0; i < ci->values_num; i++) /* {{{ */
552 o_value = ctoj_oconfig_value (jvm_env, ci->values[i]);
555 ERROR ("java plugin: ctoj_oconfig_item: "
556 "Creating an OConfigValue object failed.");
557 (*jvm_env)->DeleteLocalRef (jvm_env, o_ocitem);
561 (*jvm_env)->CallVoidMethod (jvm_env, o_ocitem, m_addvalue, o_value);
562 (*jvm_env)->DeleteLocalRef (jvm_env, o_value);
563 } /* }}} for (i = 0; i < ci->values_num; i++) */
565 /* Call OConfigItem.addChild for each child */
566 for (i = 0; i < ci->children_num; i++) /* {{{ */
570 o_child = ctoj_oconfig_item (jvm_env, ci->children + i);
573 ERROR ("java plugin: ctoj_oconfig_item: "
574 "Creating an OConfigItem object failed.");
575 (*jvm_env)->DeleteLocalRef (jvm_env, o_ocitem);
579 (*jvm_env)->CallVoidMethod (jvm_env, o_ocitem, m_addvalue, o_child);
580 (*jvm_env)->DeleteLocalRef (jvm_env, o_child);
581 } /* }}} for (i = 0; i < ci->children_num; i++) */
584 } /* }}} jobject ctoj_oconfig_item */
586 /* Convert a data_set_t to a org.collectd.api.DataSet */
587 static jobject ctoj_data_set (JNIEnv *jvm_env, const data_set_t *ds) /* {{{ */
590 jmethodID m_constructor;
596 /* Look up the org.collectd.api.DataSet class */
597 c_dataset = (*jvm_env)->FindClass (jvm_env, "org.collectd.api.DataSet");
598 if (c_dataset == NULL)
600 ERROR ("java plugin: ctoj_data_set: Looking up the "
601 "org.collectd.api.DataSet class failed.");
605 /* Search for the `DataSet (String type)' constructor. */
606 m_constructor = (*jvm_env)->GetMethodID (jvm_env,
607 c_dataset, "<init>", "(Ljava.lang.String;)V");
608 if (m_constructor == NULL)
610 ERROR ("java plugin: ctoj_data_set: Looking up the "
611 "`DataSet (String)' constructor failed.");
615 /* Search for the `void addDataSource (DataSource)' method. */
616 m_add = (*jvm_env)->GetMethodID (jvm_env,
617 c_dataset, "addDataSource", "(Lorg.collectd.api.DataSource;)V");
620 ERROR ("java plugin: ctoj_data_set: Looking up the "
621 "`addDataSource (DataSource)' method failed.");
625 o_type = (*jvm_env)->NewStringUTF (jvm_env, ds->type);
628 ERROR ("java plugin: ctoj_data_set: Creating a String object failed.");
632 o_dataset = (*jvm_env)->NewObject (jvm_env,
633 c_dataset, m_constructor, o_type);
634 if (o_dataset == NULL)
636 ERROR ("java plugin: ctoj_data_set: Creating a DataSet object failed.");
637 (*jvm_env)->DeleteLocalRef (jvm_env, o_type);
641 /* Decrease reference counter on the java.lang.String object. */
642 (*jvm_env)->DeleteLocalRef (jvm_env, o_type);
644 for (i = 0; i < ds->ds_num; i++)
646 jobject o_datasource;
648 o_datasource = ctoj_data_source (jvm_env, ds->ds + i);
649 if (o_datasource == NULL)
651 ERROR ("java plugin: ctoj_data_set: ctoj_data_source (%s.%s) failed",
652 ds->type, ds->ds[i].name);
653 (*jvm_env)->DeleteLocalRef (jvm_env, o_dataset);
657 (*jvm_env)->CallVoidMethod (jvm_env, o_dataset, m_add, o_datasource);
659 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
660 } /* for (i = 0; i < ds->ds_num; i++) */
663 } /* }}} jobject ctoj_data_set */
665 static int ctoj_value_list_add_value (JNIEnv *jvm_env, /* {{{ */
666 value_t value, int ds_type,
667 jclass class_ptr, jobject object_ptr)
669 jmethodID m_addvalue;
672 m_addvalue = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
673 "addValue", "(Ljava/lang/Number;)V");
674 if (m_addvalue == NULL)
676 ERROR ("java plugin: ctoj_value_list_add_value: "
677 "Cannot find method `void addValue (Number)'.");
681 o_number = ctoj_value_to_number (jvm_env, value, ds_type);
682 if (o_number == NULL)
684 ERROR ("java plugin: ctoj_value_list_add_value: "
685 "ctoj_value_to_number failed.");
689 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_addvalue, o_number);
691 (*jvm_env)->DeleteLocalRef (jvm_env, o_number);
694 } /* }}} int ctoj_value_list_add_value */
696 static int ctoj_value_list_add_data_set (JNIEnv *jvm_env, /* {{{ */
697 jclass c_valuelist, jobject o_valuelist, const data_set_t *ds)
699 jmethodID m_setdataset;
702 /* Look for the `void setDataSource (List<DataSource> ds)' method. */
703 m_setdataset = (*jvm_env)->GetMethodID (jvm_env, c_valuelist,
704 "setDataSet", "(Lorg.collectd.api.DataSet;)V");
705 if (m_setdataset == NULL)
707 ERROR ("java plugin: ctoj_value_list_add_data_set: "
708 "Cannot find the `void setDataSet (DataSet)' method.");
712 /* Create a DataSet object. */
713 o_dataset = ctoj_data_set (jvm_env, ds);
714 if (o_dataset == NULL)
716 ERROR ("java plugin: ctoj_value_list_add_data_set: "
717 "ctoj_data_set (%s) failed.", ds->type);
721 /* Actually call the method. */
722 (*jvm_env)->CallVoidMethod (jvm_env,
723 o_valuelist, m_setdataset, o_dataset);
725 /* Decrease reference counter on the List<DataSource> object. */
726 (*jvm_env)->DeleteLocalRef (jvm_env, o_dataset);
729 } /* }}} int ctoj_value_list_add_data_set */
731 /* Convert a value_list_t (and data_set_t) to a org.collectd.api.ValueList */
732 static jobject ctoj_value_list (JNIEnv *jvm_env, /* {{{ */
733 const data_set_t *ds, const value_list_t *vl)
736 jmethodID m_valuelist_constructor;
741 /* First, create a new ValueList instance..
742 * Look up the class.. */
743 c_valuelist = (*jvm_env)->FindClass (jvm_env,
744 "org.collectd.api.ValueList");
745 if (c_valuelist == NULL)
747 ERROR ("java plugin: ctoj_value_list: "
748 "FindClass (org.collectd.api.ValueList) failed.");
752 /* Lookup the `ValueList ()' constructor. */
753 m_valuelist_constructor = (*jvm_env)->GetMethodID (jvm_env, c_valuelist,
755 if (m_valuelist_constructor == NULL)
757 ERROR ("java plugin: ctoj_value_list: Cannot find the "
758 "`ValueList ()' constructor.");
762 /* Create a new instance. */
763 o_valuelist = (*jvm_env)->NewObject (jvm_env, c_valuelist,
764 m_valuelist_constructor);
765 if (o_valuelist == NULL)
767 ERROR ("java plugin: ctoj_value_list: Creating a new ValueList instance "
772 status = ctoj_value_list_add_data_set (jvm_env,
773 c_valuelist, o_valuelist, ds);
776 ERROR ("java plugin: ctoj_value_list: "
777 "ctoj_value_list_add_data_set failed.");
778 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist);
782 /* Set the strings.. */
783 #define SET_STRING(str,method_name) do { \
784 status = ctoj_string (jvm_env, str, \
785 c_valuelist, o_valuelist, method_name); \
787 ERROR ("java plugin: ctoj_value_list: jtoc_string (%s) failed.", \
789 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist); \
793 SET_STRING (vl->host, "setHost");
794 SET_STRING (vl->plugin, "setPlugin");
795 SET_STRING (vl->plugin_instance, "setPluginInstance");
796 SET_STRING (vl->type, "setType");
797 SET_STRING (vl->type_instance, "setTypeInstance");
801 /* Set the `time' member. Java stores time in milliseconds. */
802 status = ctoj_long (jvm_env, ((jlong) vl->time) * ((jlong) 1000),
803 c_valuelist, o_valuelist, "setTime");
806 ERROR ("java plugin: ctoj_value_list: ctoj_long (setTime) failed.");
807 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist);
811 /* Set the `interval' member.. */
812 status = ctoj_long (jvm_env, (jlong) vl->interval,
813 c_valuelist, o_valuelist, "setInterval");
816 ERROR ("java plugin: ctoj_value_list: ctoj_long (setInterval) failed.");
817 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist);
821 for (i = 0; i < vl->values_len; i++)
823 status = ctoj_value_list_add_value (jvm_env, vl->values[i], ds->ds[i].type,
824 c_valuelist, o_valuelist);
827 ERROR ("java plugin: ctoj_value_list: "
828 "ctoj_value_list_add_value failed.");
829 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist);
834 return (o_valuelist);
835 } /* }}} int ctoj_value_list */
838 * Java to C conversion functions
840 /* Call a `String <method> ()' method. */
841 static int jtoc_string (JNIEnv *jvm_env, /* {{{ */
842 char *buffer, size_t buffer_size,
843 jclass class_ptr, jobject object_ptr, const char *method_name)
849 method_id = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
850 method_name, "()Ljava/lang/String;");
851 if (method_id == NULL)
853 ERROR ("java plugin: jtoc_string: Cannot find method `String %s ()'.",
858 string_obj = (*jvm_env)->CallObjectMethod (jvm_env, object_ptr, method_id);
859 if (string_obj == NULL)
861 ERROR ("java plugin: jtoc_string: CallObjectMethod (%s) failed.",
866 c_str = (*jvm_env)->GetStringUTFChars (jvm_env, string_obj, 0);
869 ERROR ("java plugin: jtoc_string: GetStringUTFChars failed.");
870 (*jvm_env)->DeleteLocalRef (jvm_env, string_obj);
874 sstrncpy (buffer, c_str, buffer_size);
876 (*jvm_env)->ReleaseStringUTFChars (jvm_env, string_obj, c_str);
877 (*jvm_env)->DeleteLocalRef (jvm_env, string_obj);
880 } /* }}} int jtoc_string */
882 /* Call a `long <method> ()' method. */
883 static int jtoc_long (JNIEnv *jvm_env, /* {{{ */
885 jclass class_ptr, jobject object_ptr, const char *method_name)
889 method_id = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
891 if (method_id == NULL)
893 ERROR ("java plugin: jtoc_long: Cannot find method `long %s ()'.",
898 *ret_value = (*jvm_env)->CallLongMethod (jvm_env, object_ptr, method_id);
901 } /* }}} int jtoc_long */
903 /* Call a `double <method> ()' method. */
904 static int jtoc_double (JNIEnv *jvm_env, /* {{{ */
906 jclass class_ptr, jobject object_ptr, const char *method_name)
910 method_id = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
912 if (method_id == NULL)
914 ERROR ("java plugin: jtoc_string: Cannot find method `double %s ()'.",
919 *ret_value = (*jvm_env)->CallDoubleMethod (jvm_env, object_ptr, method_id);
922 } /* }}} int jtoc_double */
924 static int jtoc_value (JNIEnv *jvm_env, /* {{{ */
925 value_t *ret_value, int ds_type, jobject object_ptr)
930 class_ptr = (*jvm_env)->GetObjectClass (jvm_env, object_ptr);
932 if (ds_type == DS_TYPE_COUNTER)
936 status = jtoc_long (jvm_env, &tmp_long,
937 class_ptr, object_ptr, "longValue");
940 ERROR ("java plugin: jtoc_value: "
941 "jtoc_long failed.");
944 (*ret_value).counter = (counter_t) tmp_long;
950 status = jtoc_double (jvm_env, &tmp_double,
951 class_ptr, object_ptr, "doubleValue");
954 ERROR ("java plugin: jtoc_value: "
955 "jtoc_double failed.");
958 (*ret_value).gauge = (gauge_t) tmp_double;
962 } /* }}} int jtoc_value */
964 /* Read a List<Number>, convert it to `value_t' and add it to the given
966 static int jtoc_values_array (JNIEnv *jvm_env, /* {{{ */
967 const data_set_t *ds, value_list_t *vl,
968 jclass class_ptr, jobject object_ptr)
970 jmethodID m_getvalues;
973 jobjectArray o_number_array;
979 values_num = ds->ds_num;
982 o_number_array = NULL;
985 #define BAIL_OUT(status) \
987 if (o_number_array != NULL) \
988 (*jvm_env)->DeleteLocalRef (jvm_env, o_number_array); \
989 if (o_list != NULL) \
990 (*jvm_env)->DeleteLocalRef (jvm_env, o_list); \
993 /* Call: List<Number> ValueList.getValues () */
994 m_getvalues = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
995 "getValues", "()Ljava/util/List;");
996 if (m_getvalues == NULL)
998 ERROR ("java plugin: jtoc_values_array: "
999 "Cannot find method `List getValues ()'.");
1003 o_list = (*jvm_env)->CallObjectMethod (jvm_env, object_ptr, m_getvalues);
1006 ERROR ("java plugin: jtoc_values_array: "
1007 "CallObjectMethod (getValues) failed.");
1011 /* Call: Number[] List.toArray () */
1012 m_toarray = (*jvm_env)->GetMethodID (jvm_env,
1013 (*jvm_env)->GetObjectClass (jvm_env, o_list),
1014 "toArray", "()[Ljava/lang/Object;");
1015 if (m_toarray == NULL)
1017 ERROR ("java plugin: jtoc_values_array: "
1018 "Cannot find method `Object[] toArray ()'.");
1022 o_number_array = (*jvm_env)->CallObjectMethod (jvm_env, o_list, m_toarray);
1023 if (o_number_array == NULL)
1025 ERROR ("java plugin: jtoc_values_array: "
1026 "CallObjectMethod (toArray) failed.");
1030 values = (value_t *) calloc (values_num, sizeof (value_t));
1033 ERROR ("java plugin: jtoc_values_array: calloc failed.");
1037 for (i = 0; i < values_num; i++)
1042 o_number = (*jvm_env)->GetObjectArrayElement (jvm_env,
1043 o_number_array, (jsize) i);
1044 if (o_number == NULL)
1046 ERROR ("java plugin: jtoc_values_array: "
1047 "GetObjectArrayElement (%i) failed.", i);
1051 status = jtoc_value (jvm_env, values + i, ds->ds[i].type, o_number);
1054 ERROR ("java plugin: jtoc_values_array: "
1055 "jtoc_value (%i) failed.", i);
1058 } /* for (i = 0; i < values_num; i++) */
1060 vl->values = values;
1061 vl->values_len = values_num;
1064 (*jvm_env)->DeleteLocalRef (jvm_env, o_number_array);
1065 (*jvm_env)->DeleteLocalRef (jvm_env, o_list);
1067 } /* }}} int jtoc_values_array */
1069 /* Convert a org.collectd.api.ValueList to a value_list_t. */
1070 static int jtoc_value_list (JNIEnv *jvm_env, value_list_t *vl, /* {{{ */
1076 const data_set_t *ds;
1078 class_ptr = (*jvm_env)->GetObjectClass (jvm_env, object_ptr);
1079 if (class_ptr == NULL)
1081 ERROR ("java plugin: jtoc_value_list: GetObjectClass failed.");
1085 #define SET_STRING(buffer,method) do { \
1086 status = jtoc_string (jvm_env, buffer, sizeof (buffer), \
1087 class_ptr, object_ptr, method); \
1088 if (status != 0) { \
1089 ERROR ("java plugin: jtoc_value_list: jtoc_string (%s) failed.", \
1094 SET_STRING(vl->type, "getType");
1096 ds = plugin_get_ds (vl->type);
1099 ERROR ("java plugin: jtoc_value_list: Data-set `%s' is not defined. "
1100 "Please consult the types.db(5) manpage for mor information.",
1105 SET_STRING(vl->host, "getHost");
1106 SET_STRING(vl->plugin, "getPlugin");
1107 SET_STRING(vl->plugin_instance, "getPluginInstance");
1108 SET_STRING(vl->type_instance, "getTypeInstance");
1112 status = jtoc_long (jvm_env, &tmp_long, class_ptr, object_ptr, "getTime");
1115 ERROR ("java plugin: jtoc_value_list: jtoc_long (getTime) failed.");
1118 /* Java measures time in milliseconds. */
1119 vl->time = (time_t) (tmp_long / ((jlong) 1000));
1121 status = jtoc_long (jvm_env, &tmp_long,
1122 class_ptr, object_ptr, "getInterval");
1125 ERROR ("java plugin: jtoc_value_list: jtoc_long (getInterval) failed.");
1128 vl->interval = (int) tmp_long;
1130 status = jtoc_values_array (jvm_env, ds, vl, class_ptr, object_ptr);
1133 ERROR ("java plugin: jtoc_value_list: jtoc_values_array failed.");
1138 } /* }}} int jtoc_value_list */
1141 * Functions accessible from Java
1143 static jint JNICALL cjni_api_dispatch_values (JNIEnv *jvm_env, /* {{{ */
1144 jobject this, jobject java_vl)
1146 value_list_t vl = VALUE_LIST_INIT;
1149 DEBUG ("cjni_api_dispatch_values: java_vl = %p;", (void *) java_vl);
1151 status = jtoc_value_list (jvm_env, &vl, java_vl);
1154 ERROR ("java plugin: cjni_api_dispatch_values: jtoc_value_list failed.");
1158 status = plugin_dispatch_values (&vl);
1163 } /* }}} jint cjni_api_dispatch_values */
1165 static jobject JNICALL cjni_api_get_ds (JNIEnv *jvm_env, /* {{{ */
1166 jobject this, jobject o_string_type)
1168 const char *ds_name;
1169 const data_set_t *ds;
1172 ds_name = (*jvm_env)->GetStringUTFChars (jvm_env, o_string_type, 0);
1173 if (ds_name == NULL)
1175 ERROR ("java plugin: cjni_api_get_ds: GetStringUTFChars failed.");
1179 ds = plugin_get_ds (ds_name);
1180 DEBUG ("java plugin: cjni_api_get_ds: "
1181 "plugin_get_ds (%s) = %p;", ds_name, (void *) ds);
1183 (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_string_type, ds_name);
1188 o_dataset = ctoj_data_set (jvm_env, ds);
1190 } /* }}} jint cjni_api_get_ds */
1192 static jint JNICALL cjni_api_register_config (JNIEnv *jvm_env, /* {{{ */
1193 jobject this, jobject o_name, jobject o_config)
1195 return (cjni_callback_register (jvm_env, o_name, o_config, CB_TYPE_CONFIG));
1196 } /* }}} jint cjni_api_register_config */
1198 static jint JNICALL cjni_api_register_init (JNIEnv *jvm_env, /* {{{ */
1199 jobject this, jobject o_name, jobject o_config)
1201 return (cjni_callback_register (jvm_env, o_name, o_config, CB_TYPE_INIT));
1202 } /* }}} jint cjni_api_register_init */
1204 static jint JNICALL cjni_api_register_read (JNIEnv *jvm_env, /* {{{ */
1205 jobject this, jobject o_name, jobject o_read)
1208 cjni_callback_info_t *cbi;
1210 cbi = cjni_callback_info_create (jvm_env, o_name, o_read, CB_TYPE_READ);
1214 DEBUG ("java plugin: Registering new read callback: %s", cbi->name);
1216 memset (&ud, 0, sizeof (ud));
1217 ud.data = (void *) cbi;
1218 ud.free_func = cjni_callback_info_destroy;
1220 plugin_register_complex_read (cbi->name, cjni_read, &ud);
1222 (*jvm_env)->DeleteLocalRef (jvm_env, o_read);
1225 } /* }}} jint cjni_api_register_read */
1227 static jint JNICALL cjni_api_register_write (JNIEnv *jvm_env, /* {{{ */
1228 jobject this, jobject o_name, jobject o_write)
1231 cjni_callback_info_t *cbi;
1233 cbi = cjni_callback_info_create (jvm_env, o_name, o_write, CB_TYPE_WRITE);
1237 DEBUG ("java plugin: Registering new write callback: %s", cbi->name);
1239 memset (&ud, 0, sizeof (ud));
1240 ud.data = (void *) cbi;
1241 ud.free_func = cjni_callback_info_destroy;
1243 plugin_register_write (cbi->name, cjni_write, &ud);
1245 (*jvm_env)->DeleteLocalRef (jvm_env, o_write);
1248 } /* }}} jint cjni_api_register_write */
1250 static jint JNICALL cjni_api_register_shutdown (JNIEnv *jvm_env, /* {{{ */
1251 jobject this, jobject o_name, jobject o_shutdown)
1253 return (cjni_callback_register (jvm_env, o_name, o_shutdown,
1255 } /* }}} jint cjni_api_register_shutdown */
1257 /* List of ``native'' functions, i. e. C-functions that can be called from
1259 static JNINativeMethod jni_api_functions[] = /* {{{ */
1262 "(Lorg/collectd/api/ValueList;)I",
1263 cjni_api_dispatch_values },
1266 "(Ljava/lang/String;)Lorg/collectd/api/DataSet;",
1270 "(Ljava/lang/String;Lorg/collectd/api/CollectdConfigInterface;)I",
1271 cjni_api_register_config },
1274 "(Ljava/lang/String;Lorg/collectd/api/CollectdInitInterface;)I",
1275 cjni_api_register_init },
1278 "(Ljava/lang/String;Lorg/collectd/api/CollectdReadInterface;)I",
1279 cjni_api_register_read },
1282 "(Ljava/lang/String;Lorg/collectd/api/CollectdWriteInterface;)I",
1283 cjni_api_register_write },
1285 { "RegisterShutdown",
1286 "(Ljava/lang/String;Lorg/collectd/api/CollectdShutdownInterface;)I",
1287 cjni_api_register_shutdown }
1290 static size_t jni_api_functions_num = sizeof (jni_api_functions)
1291 / sizeof (jni_api_functions[0]);
1297 /* Allocate a `cjni_callback_info_t' given the type and objects necessary for
1298 * all registration functions. */
1299 static cjni_callback_info_t *cjni_callback_info_create (JNIEnv *jvm_env, /* {{{ */
1300 jobject o_name, jobject o_callback, int type)
1303 cjni_callback_info_t *cbi;
1304 const char *method_name;
1305 const char *method_signature;
1309 case CB_TYPE_CONFIG:
1310 method_name = "Config";
1311 method_signature = "(Lorg/collectd/api/OConfigItem;)I";
1315 method_name = "Init";
1316 method_signature = "()I";
1320 method_name = "Read";
1321 method_signature = "()I";
1325 method_name = "Write";
1326 method_signature = "(Lorg/collectd/api/ValueList;)I";
1329 case CB_TYPE_SHUTDOWN:
1330 method_name = "Shutdown";
1331 method_signature = "()I";
1335 ERROR ("java plugin: cjni_callback_info_create: Unknown type: %#x",
1340 c_name = (*jvm_env)->GetStringUTFChars (jvm_env, o_name, 0);
1343 ERROR ("java plugin: cjni_callback_info_create: "
1344 "GetStringUTFChars failed.");
1348 cbi = (cjni_callback_info_t *) malloc (sizeof (*cbi));
1351 ERROR ("java plugin: cjni_callback_info_create: malloc failed.");
1352 (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_name, c_name);
1355 memset (cbi, 0, sizeof (*cbi));
1358 cbi->name = strdup (c_name);
1359 if (cbi->name == NULL)
1361 pthread_mutex_unlock (&java_callbacks_lock);
1362 ERROR ("java plugin: cjni_callback_info_create: strdup failed.");
1363 (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_name, c_name);
1367 (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_name, c_name);
1369 cbi->class = (*jvm_env)->GetObjectClass (jvm_env, o_callback);
1370 if (cbi->class == NULL)
1372 ERROR ("java plugin: cjni_callback_info_create: GetObjectClass failed.");
1377 cbi->object = o_callback;
1379 cbi->method = (*jvm_env)->GetMethodID (jvm_env, cbi->class,
1380 method_name, method_signature);
1381 if (cbi->method == NULL)
1383 ERROR ("java plugin: cjni_callback_info_create: "
1384 "Cannot find the `%s' method with signature `%s'.",
1385 method_name, method_signature);
1390 (*jvm_env)->NewGlobalRef (jvm_env, o_callback);
1393 } /* }}} cjni_callback_info_t cjni_callback_info_create */
1395 /* Allocate a `cjni_callback_info_t' via `cjni_callback_info_create' and add it
1396 * to the global `java_callbacks' variable. This is used for `config', `init',
1397 * and `shutdown' callbacks. */
1398 static int cjni_callback_register (JNIEnv *jvm_env, /* {{{ */
1399 jobject o_name, jobject o_callback, int type)
1401 cjni_callback_info_t *cbi;
1402 cjni_callback_info_t *tmp;
1404 const char *type_str;
1407 cbi = cjni_callback_info_create (jvm_env, o_name, o_callback, type);
1414 case CB_TYPE_CONFIG:
1415 type_str = "config";
1422 case CB_TYPE_SHUTDOWN:
1423 type_str = "shutdown";
1427 type_str = "<unknown>";
1429 DEBUG ("java plugin: Registering new %s callback: %s",
1430 type_str, cbi->name);
1433 pthread_mutex_lock (&java_callbacks_lock);
1435 tmp = (cjni_callback_info_t *) realloc (java_callbacks,
1436 (java_callbacks_num + 1) * sizeof (*java_callbacks));
1439 pthread_mutex_unlock (&java_callbacks_lock);
1440 ERROR ("java plugin: cjni_callback_register: realloc failed.");
1442 (*jvm_env)->DeleteGlobalRef (jvm_env, cbi->object);
1447 java_callbacks = tmp;
1448 java_callbacks[java_callbacks_num] = *cbi;
1449 java_callbacks_num++;
1451 pthread_mutex_unlock (&java_callbacks_lock);
1455 } /* }}} int cjni_callback_register */
1457 /* Increase the reference counter to the JVM for this thread. If it was zero,
1458 * attach the JVM first. */
1459 static JNIEnv *cjni_thread_attach (void) /* {{{ */
1461 cjni_jvm_env_t *cjni_env;
1464 cjni_env = pthread_getspecific (jvm_env_key);
1465 if (cjni_env == NULL)
1467 /* This pointer is free'd in `cjni_jvm_env_destroy'. */
1468 cjni_env = (cjni_jvm_env_t *) malloc (sizeof (*cjni_env));
1469 if (cjni_env == NULL)
1471 ERROR ("java plugin: cjni_thread_attach: malloc failed.");
1474 memset (cjni_env, 0, sizeof (*cjni_env));
1475 cjni_env->reference_counter = 0;
1476 cjni_env->jvm_env = NULL;
1478 pthread_setspecific (jvm_env_key, cjni_env);
1481 if (cjni_env->reference_counter > 0)
1483 cjni_env->reference_counter++;
1484 jvm_env = cjni_env->jvm_env;
1489 JavaVMAttachArgs args;
1491 assert (cjni_env->jvm_env == NULL);
1493 memset (&args, 0, sizeof (args));
1494 args.version = JNI_VERSION_1_2;
1496 status = (*jvm)->AttachCurrentThread (jvm, (void *) &jvm_env, (void *) &args);
1499 ERROR ("java plugin: cjni_thread_attach: AttachCurrentThread failed "
1500 "with status %i.", status);
1504 cjni_env->reference_counter = 1;
1505 cjni_env->jvm_env = jvm_env;
1508 DEBUG ("java plugin: cjni_thread_attach: cjni_env->reference_counter = %i",
1509 cjni_env->reference_counter);
1510 assert (jvm_env != NULL);
1512 } /* }}} JNIEnv *cjni_thread_attach */
1514 /* Decrease the reference counter of this thread. If it reaches zero, detach
1516 static int cjni_thread_detach (void) /* {{{ */
1518 cjni_jvm_env_t *cjni_env;
1521 cjni_env = pthread_getspecific (jvm_env_key);
1522 if (cjni_env == NULL)
1524 ERROR ("java plugin: cjni_thread_detach: pthread_getspecific failed.");
1528 assert (cjni_env->reference_counter > 0);
1529 assert (cjni_env->jvm_env != NULL);
1531 cjni_env->reference_counter--;
1532 DEBUG ("java plugin: cjni_thread_detach: cjni_env->reference_counter = %i",
1533 cjni_env->reference_counter);
1535 if (cjni_env->reference_counter > 0)
1538 status = (*jvm)->DetachCurrentThread (jvm);
1541 ERROR ("java plugin: cjni_thread_detach: DetachCurrentThread failed "
1542 "with status %i.", status);
1545 cjni_env->reference_counter = 0;
1546 cjni_env->jvm_env = NULL;
1549 } /* }}} JNIEnv *cjni_thread_attach */
1551 /* Callback for `pthread_key_create'. It frees the data contained in
1552 * `jvm_env_key' and prints a warning if the reference counter is not zero. */
1553 static void cjni_jvm_env_destroy (void *args) /* {{{ */
1555 cjni_jvm_env_t *cjni_env;
1560 cjni_env = (cjni_jvm_env_t *) args;
1562 if (cjni_env->reference_counter > 0)
1564 ERROR ("java plugin: cjni_jvm_env_destroy: "
1565 "cjni_env->reference_counter = %i;", cjni_env->reference_counter);
1568 if (cjni_env->jvm_env != NULL)
1570 ERROR ("java plugin: cjni_jvm_env_destroy: cjni_env->jvm_env = %p;",
1571 (void *) cjni_env->jvm_env);
1574 /* The pointer is allocated in `cjni_thread_attach' */
1576 } /* }}} void cjni_jvm_env_destroy */
1578 /* Boring configuration functions.. {{{ */
1579 static int cjni_config_add_jvm_arg (oconfig_item_t *ci) /* {{{ */
1583 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
1585 WARNING ("java plugin: `JVMArg' needs exactly one string argument.");
1589 tmp = (char **) realloc (jvm_argv, sizeof (char *) * (jvm_argc + 1));
1592 ERROR ("java plugin: realloc failed.");
1597 jvm_argv[jvm_argc] = strdup (ci->values[0].value.string);
1598 if (jvm_argv[jvm_argc] == NULL)
1600 ERROR ("java plugin: strdup failed.");
1606 } /* }}} int cjni_config_add_jvm_arg */
1608 static int cjni_config_load_plugin (oconfig_item_t *ci) /* {{{ */
1610 java_plugin_class_t *tmp;
1612 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
1614 WARNING ("java plugin: `LoadPlugin' needs exactly one string argument.");
1618 tmp = (java_plugin_class_t *) realloc (java_classes_list,
1619 (java_classes_list_len + 1) * sizeof (*java_classes_list));
1622 ERROR ("java plugin: realloc failed.");
1625 java_classes_list = tmp;
1626 tmp = java_classes_list + java_classes_list_len;
1628 memset (tmp, 0, sizeof (*tmp));
1629 tmp->name = strdup (ci->values[0].value.string);
1630 if (tmp->name == NULL)
1632 ERROR ("java plugin: strdup failed.");
1638 java_classes_list_len++;
1641 } /* }}} int cjni_config_load_plugin */
1643 static int cjni_config_plugin_block (oconfig_item_t *ci) /* {{{ */
1645 java_plugin_config_t *tmp;
1649 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
1651 WARNING ("java plugin: `Plugin' blocks "
1652 "need exactly one string argument.");
1656 name = strdup (ci->values[0].value.string);
1659 ERROR ("java plugin: cjni_config_plugin_block: strdup faiiled.");
1663 for (i = 0; i < java_plugin_configs_num; i++)
1665 if (strcmp (java_plugin_configs[i].name, name) == 0)
1667 WARNING ("java plugin: There is more than one <Plugin \"%s\"> block. "
1668 "This is currently not supported - "
1669 "only the first block will be used!",
1676 tmp = (java_plugin_config_t *) realloc (java_plugin_configs,
1677 (java_plugin_configs_num + 1) * sizeof (*java_plugin_configs));
1680 ERROR ("java plugin: cjni_config_plugin_block: realloc failed.");
1684 java_plugin_configs = tmp;
1685 tmp = java_plugin_configs + java_plugin_configs_num;
1688 tmp->ci = oconfig_clone (ci);
1689 if (tmp->ci == NULL)
1691 ERROR ("java plugin: cjni_config_plugin_block: "
1692 "oconfig_clone failed for `%s'.",
1698 DEBUG ("java plugin: cjni_config_plugin_block: "
1699 "Successfully copied config for `%s'.",
1702 java_plugin_configs_num++;
1704 } /* }}} int cjni_config_plugin_block */
1706 static int cjni_config (oconfig_item_t *ci) /* {{{ */
1716 for (i = 0; i < ci->children_num; i++)
1718 oconfig_item_t *child = ci->children + i;
1720 if (strcasecmp ("JVMArg", child->key) == 0)
1722 status = cjni_config_add_jvm_arg (child);
1728 else if (strcasecmp ("LoadPlugin", child->key) == 0)
1730 status = cjni_config_load_plugin (child);
1736 else if (strcasecmp ("Plugin", child->key) == 0)
1738 status = cjni_config_plugin_block (child);
1746 WARNING ("java plugin: Option `%s' not allowed here.", child->key);
1751 DEBUG ("java plugin: jvm_argc = %zu;", jvm_argc);
1752 DEBUG ("java plugin: java_classes_list_len = %zu;", java_classes_list_len);
1753 DEBUG ("java plugin: java_plugin_configs_num = %zu;",
1754 java_plugin_configs_num);
1756 if ((success == 0) && (errors > 0))
1758 ERROR ("java plugin: All statements failed.");
1763 } /* }}} int cjni_config */
1766 /* Free the data contained in the `user_data_t' pointer passed to `cjni_read'
1767 * and `cjni_write'. In particular, delete the global reference to the Java
1769 static void cjni_callback_info_destroy (void *arg) /* {{{ */
1772 cjni_callback_info_t *cbi;
1774 DEBUG ("java plugin: cjni_callback_info_destroy (arg = %p);", arg);
1779 jvm_env = cjni_thread_attach ();
1780 if (jvm_env == NULL)
1782 ERROR ("java plugin: cjni_callback_info_destroy: cjni_thread_attach failed.");
1786 cbi = (cjni_callback_info_t *) arg;
1788 (*jvm_env)->DeleteGlobalRef (jvm_env, cbi->object);
1795 cjni_thread_detach ();
1796 } /* }}} void cjni_callback_info_destroy */
1798 /* Call the CB_TYPE_READ callback pointed to by the `user_data_t' pointer. */
1799 static int cjni_read (user_data_t *ud) /* {{{ */
1802 cjni_callback_info_t *cbi;
1807 ERROR ("java plugin: cjni_read: jvm == NULL");
1811 if ((ud == NULL) || (ud->data == NULL))
1813 ERROR ("java plugin: cjni_read: Invalid user data.");
1817 jvm_env = cjni_thread_attach ();
1818 if (jvm_env == NULL)
1821 cbi = (cjni_callback_info_t *) ud->data;
1823 status = (*jvm_env)->CallIntMethod (jvm_env, cbi->object,
1826 status = cjni_thread_detach ();
1829 ERROR ("java plugin: cjni_read: cjni_thread_detach failed.");
1834 } /* }}} int cjni_read */
1836 /* Call the CB_TYPE_WRITE callback pointed to by the `user_data_t' pointer. */
1837 static int cjni_write (const data_set_t *ds, const value_list_t *vl, /* {{{ */
1841 cjni_callback_info_t *cbi;
1847 ERROR ("java plugin: cjni_write: jvm == NULL");
1851 if ((ud == NULL) || (ud->data == NULL))
1853 ERROR ("java plugin: cjni_write: Invalid user data.");
1857 jvm_env = cjni_thread_attach ();
1858 if (jvm_env == NULL)
1861 cbi = (cjni_callback_info_t *) ud->data;
1863 vl_java = ctoj_value_list (jvm_env, ds, vl);
1864 if (vl_java == NULL)
1866 ERROR ("java plugin: cjni_write: ctoj_value_list failed.");
1870 status = (*jvm_env)->CallIntMethod (jvm_env,
1871 cbi->object, cbi->method, vl_java);
1873 (*jvm_env)->DeleteLocalRef (jvm_env, vl_java);
1875 status = cjni_thread_detach ();
1878 ERROR ("java plugin: cjni_write: cjni_thread_detach failed.");
1883 } /* }}} int cjni_write */
1885 /* Iterate over `java_classes_list' and create one object of each class. This
1886 * will trigger the object's constructors, to the objects can register callback
1888 static int cjni_load_plugins (JNIEnv *jvm_env) /* {{{ */
1892 for (i = 0; i < java_classes_list_len; i++)
1894 java_plugin_class_t *class;
1895 jmethodID constructor_id;
1897 class = java_classes_list + i;
1899 DEBUG ("java plugin: Loading class %s", class->name);
1901 class->class = (*jvm_env)->FindClass (jvm_env, class->name);
1902 if (class->class == NULL)
1904 ERROR ("java plugin: cjni_load_plugins: FindClass (%s) failed.",
1909 constructor_id = (*jvm_env)->GetMethodID (jvm_env, class->class,
1911 if (constructor_id == NULL)
1913 ERROR ("java plugin: cjni_load_plugins: Could not find the constructor for `%s'.",
1918 class->object = (*jvm_env)->NewObject (jvm_env, class->class,
1920 if (class->object == NULL)
1922 ERROR ("java plugin: cjni_load_plugins: Could create a new `%s' object.",
1927 (*jvm_env)->NewGlobalRef (jvm_env, class->object);
1928 } /* for (i = 0; i < java_classes_list_len; i++) */
1931 } /* }}} int cjni_load_plugins */
1933 /* Iterate over `java_plugin_configs' and `java_callbacks' and call all
1934 * `config' callback methods for which a configuration is available. */
1935 static int cjni_config_plugins (JNIEnv *jvm_env) /* {{{ */
1941 for (i = 0; i < java_plugin_configs_num; i++)
1945 if (java_plugin_configs[i].ci == NULL)
1948 for (j = 0; j < java_callbacks_num; j++)
1950 if (java_callbacks[j].type != CB_TYPE_CONFIG)
1953 if (strcmp (java_plugin_configs[i].name, java_callbacks[j].name) == 0)
1957 if (j >= java_callbacks_num)
1959 NOTICE ("java plugin: Configuration for `%s' is present, but no such "
1960 "configuration callback has been registered.",
1961 java_plugin_configs[i].name);
1965 DEBUG ("java plugin: Configuring %s", java_plugin_configs[i].name);
1967 o_ocitem = ctoj_oconfig_item (jvm_env, java_plugin_configs[i].ci);
1968 if (o_ocitem == NULL)
1970 ERROR ("java plugin: cjni_config_plugins: ctoj_oconfig_item failed.");
1974 status = (*jvm_env)->CallIntMethod (jvm_env,
1975 java_callbacks[j].object, java_callbacks[j].method, o_ocitem);
1976 WARNING ("java plugin: Config callback for `%s' returned status %i.",
1977 java_plugin_configs[i].name, status);
1978 } /* for (i = 0; i < java_plugin_configs; i++) */
1981 } /* }}} int cjni_config_plugins */
1983 /* Iterate over `java_callbacks' and call all CB_TYPE_INIT callbacks. */
1984 static int cjni_init_plugins (JNIEnv *jvm_env) /* {{{ */
1989 for (i = 0; i < java_callbacks_num; i++)
1991 if (java_callbacks[i].type != CB_TYPE_INIT)
1994 DEBUG ("java plugin: Initializing %s", java_callbacks[i].name);
1996 status = (*jvm_env)->CallIntMethod (jvm_env,
1997 java_callbacks[i].object, java_callbacks[i].method);
2000 ERROR ("java plugin: Initializing `%s' failed with status %i. "
2001 "Removing read function.",
2002 java_callbacks[i].name, status);
2003 plugin_unregister_read (java_callbacks[i].name);
2008 } /* }}} int cjni_init_plugins */
2010 /* Iterate over `java_callbacks' and call all CB_TYPE_SHUTDOWN callbacks. */
2011 static int cjni_shutdown_plugins (JNIEnv *jvm_env) /* {{{ */
2016 for (i = 0; i < java_callbacks_num; i++)
2018 if (java_callbacks[i].type != CB_TYPE_SHUTDOWN)
2021 DEBUG ("java plugin: Shutting down %s", java_callbacks[i].name);
2023 status = (*jvm_env)->CallIntMethod (jvm_env,
2024 java_callbacks[i].object, java_callbacks[i].method);
2027 ERROR ("java plugin: Shutting down `%s' failed with status %i. ",
2028 java_callbacks[i].name, status);
2033 } /* }}} int cjni_shutdown_plugins */
2036 static int cjni_shutdown (void) /* {{{ */
2039 JavaVMAttachArgs args;
2047 memset (&args, 0, sizeof (args));
2048 args.version = JNI_VERSION_1_2;
2050 status = (*jvm)->AttachCurrentThread (jvm, (void **) &jvm_env, &args);
2053 ERROR ("java plugin: cjni_shutdown: AttachCurrentThread failed with status %i.",
2058 /* Execute all the shutdown functions registered by plugins. */
2059 cjni_shutdown_plugins (jvm_env);
2061 /* Release all the global references to callback functions */
2062 for (i = 0; i < java_callbacks_num; i++)
2064 if (java_callbacks[i].object != NULL)
2066 (*jvm_env)->DeleteGlobalRef (jvm_env, java_callbacks[i].object);
2067 java_callbacks[i].object = NULL;
2069 sfree (java_callbacks[i].name);
2071 java_callbacks_num = 0;
2072 sfree (java_callbacks);
2074 /* Release all the global references to directly loaded classes. */
2075 for (i = 0; i < java_classes_list_len; i++)
2077 if (java_classes_list[i].object != NULL)
2079 (*jvm_env)->DeleteGlobalRef (jvm_env, java_classes_list[i].object);
2080 java_classes_list[i].object = NULL;
2082 sfree (java_classes_list[i].name);
2084 java_classes_list_len = 0;
2085 sfree (java_classes_list);
2087 /* Destroy the JVM */
2088 (*jvm)->DestroyJavaVM (jvm);
2092 pthread_key_delete (jvm_env_key);
2094 /* Free the JVM argument list */
2095 for (i = 0; i < jvm_argc; i++)
2096 sfree (jvm_argv[i]);
2100 /* Free the copied configuration */
2101 for (i = 0; i < java_plugin_configs_num; i++)
2103 sfree (java_plugin_configs[i].name);
2104 oconfig_free (java_plugin_configs[i].ci);
2106 java_plugin_configs_num = 0;
2107 sfree (java_plugin_configs);
2110 } /* }}} int cjni_shutdown */
2112 /* Register ``native'' functions with the JVM. Native functions are C-functions
2113 * that can be called by Java code. */
2114 static int cjni_init_native (JNIEnv *jvm_env) /* {{{ */
2116 jclass api_class_ptr;
2119 api_class_ptr = (*jvm_env)->FindClass (jvm_env, "org.collectd.api.CollectdAPI");
2120 if (api_class_ptr == NULL)
2122 ERROR ("cjni_init_native: Cannot find API class `org.collectd.api.CollectdAPI'.");
2126 status = (*jvm_env)->RegisterNatives (jvm_env, api_class_ptr,
2127 jni_api_functions, (jint) jni_api_functions_num);
2130 ERROR ("cjni_init_native: RegisterNatives failed with status %i.", status);
2135 } /* }}} int cjni_init_native */
2137 /* Initialization: Create a JVM, load all configured classes and call their
2138 * `config' and `init' callback methods. */
2139 static int cjni_init (void) /* {{{ */
2142 JavaVMInitArgs vm_args;
2143 JavaVMOption vm_options[jvm_argc];
2151 status = pthread_key_create (&jvm_env_key, cjni_jvm_env_destroy);
2154 ERROR ("java plugin: cjni_init: pthread_key_create failed "
2155 "with status %i.", status);
2161 memset (&vm_args, 0, sizeof (vm_args));
2162 vm_args.version = JNI_VERSION_1_2;
2163 vm_args.options = vm_options;
2164 vm_args.nOptions = (jint) jvm_argc;
2166 for (i = 0; i < jvm_argc; i++)
2168 DEBUG ("java plugin: cjni_init: jvm_argv[%zu] = %s", i, jvm_argv[i]);
2169 vm_args.options[i].optionString = jvm_argv[i];
2172 vm_args.options[0].optionString = "-verbose:jni";
2173 vm_args.options[1].optionString = "-Djava.class.path=/home/octo/collectd/bindings/java";
2176 status = JNI_CreateJavaVM (&jvm, (void **) &jvm_env, (void **) &vm_args);
2179 ERROR ("cjni_init: JNI_CreateJavaVM failed with status %i.",
2183 assert (jvm != NULL);
2184 assert (jvm_env != NULL);
2186 /* Call RegisterNatives */
2187 status = cjni_init_native (jvm_env);
2190 ERROR ("cjni_init: cjni_init_native failed.");
2194 cjni_load_plugins (jvm_env);
2195 cjni_config_plugins (jvm_env);
2196 cjni_init_plugins (jvm_env);
2199 } /* }}} int cjni_init */
2201 void module_register (void)
2203 plugin_register_complex_config ("java", cjni_config);
2204 plugin_register_init ("java", cjni_init);
2205 plugin_register_shutdown ("java", cjni_shutdown);
2206 } /* void module_register (void) */
2208 /* vim: set sw=2 sts=2 et fdm=marker : */