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_FLUSH 5
68 #define CB_TYPE_SHUTDOWN 6
70 struct cjni_callback_info_s /* {{{ */
78 typedef struct cjni_callback_info_s cjni_callback_info_t;
84 static JavaVM *jvm = NULL;
85 static pthread_key_t jvm_env_key;
87 /* Configuration options for the JVM. */
88 static char **jvm_argv = NULL;
89 static size_t jvm_argc = 0;
91 /* List of class names to load */
92 static java_plugin_class_t *java_classes_list = NULL;
93 static size_t java_classes_list_len;
95 /* List of `config_item_t's for Java plugins */
96 static java_plugin_config_t *java_plugin_configs = NULL;
97 static size_t java_plugin_configs_num = 0;
99 /* List of config, init, and shutdown callbacks. */
100 static cjni_callback_info_t *java_callbacks = NULL;
101 static size_t java_callbacks_num = 0;
102 static pthread_mutex_t java_callbacks_lock = PTHREAD_MUTEX_INITIALIZER;
107 * Mostly functions that are needed by the Java interface (``native'')
110 static void cjni_callback_info_destroy (void *arg);
111 static cjni_callback_info_t *cjni_callback_info_create (JNIEnv *jvm_env,
112 jobject o_name, jobject o_callback, int type);
113 static int cjni_callback_register (JNIEnv *jvm_env, jobject o_name,
114 jobject o_callback, int type);
115 static int cjni_read (user_data_t *user_data);
116 static int cjni_write (const data_set_t *ds, const value_list_t *vl,
118 static int cjni_flush (int timeout, const char *identifier, user_data_t *ud);
119 static void cjni_log (int severity, const char *message, user_data_t *ud);
122 * C to Java conversion functions
124 static int ctoj_string (JNIEnv *jvm_env, /* {{{ */
126 jclass class_ptr, jobject object_ptr, const char *method_name)
131 /* Create a java.lang.String */
132 o_string = (*jvm_env)->NewStringUTF (jvm_env,
133 (string != NULL) ? string : "");
134 if (o_string == NULL)
136 ERROR ("java plugin: ctoj_string: NewStringUTF failed.");
140 /* Search for the `void setFoo (String s)' method. */
141 m_set = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
142 method_name, "(Ljava/lang/String;)V");
145 ERROR ("java plugin: ctoj_string: Cannot find method `void %s (String)'.",
147 (*jvm_env)->DeleteLocalRef (jvm_env, o_string);
151 /* Call the method. */
152 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_set, o_string);
154 /* Decrease reference counter on the java.lang.String object. */
155 (*jvm_env)->DeleteLocalRef (jvm_env, o_string);
158 } /* }}} int ctoj_string */
160 static int ctoj_int (JNIEnv *jvm_env, /* {{{ */
162 jclass class_ptr, jobject object_ptr, const char *method_name)
166 /* Search for the `void setFoo (int i)' method. */
167 m_set = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
168 method_name, "(I)V");
171 ERROR ("java plugin: ctoj_int: Cannot find method `void %s (int)'.",
176 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_set, value);
179 } /* }}} int ctoj_int */
181 static int ctoj_long (JNIEnv *jvm_env, /* {{{ */
183 jclass class_ptr, jobject object_ptr, const char *method_name)
187 /* Search for the `void setFoo (long l)' method. */
188 m_set = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
189 method_name, "(J)V");
192 ERROR ("java plugin: ctoj_long: Cannot find method `void %s (long)'.",
197 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_set, value);
200 } /* }}} int ctoj_long */
202 static int ctoj_double (JNIEnv *jvm_env, /* {{{ */
204 jclass class_ptr, jobject object_ptr, const char *method_name)
208 /* Search for the `void setFoo (double d)' method. */
209 m_set = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
210 method_name, "(D)V");
213 ERROR ("java plugin: ctoj_double: Cannot find method `void %s (double)'.",
218 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_set, value);
221 } /* }}} int ctoj_double */
223 /* Convert a jlong to a java.lang.Number */
224 static jobject ctoj_jlong_to_number (JNIEnv *jvm_env, jlong value) /* {{{ */
227 jmethodID m_long_constructor;
229 /* Look up the java.lang.Long class */
230 c_long = (*jvm_env)->FindClass (jvm_env, "java.lang.Long");
233 ERROR ("java plugin: ctoj_jlong_to_number: Looking up the "
234 "java.lang.Long class failed.");
238 m_long_constructor = (*jvm_env)->GetMethodID (jvm_env,
239 c_long, "<init>", "(J)V");
240 if (m_long_constructor == NULL)
242 ERROR ("java plugin: ctoj_jlong_to_number: Looking up the "
243 "`Long (long)' constructor failed.");
247 return ((*jvm_env)->NewObject (jvm_env,
248 c_long, m_long_constructor, value));
249 } /* }}} jobject ctoj_jlong_to_number */
251 /* Convert a jdouble to a java.lang.Number */
252 static jobject ctoj_jdouble_to_number (JNIEnv *jvm_env, jdouble value) /* {{{ */
255 jmethodID m_double_constructor;
257 /* Look up the java.lang.Long class */
258 c_double = (*jvm_env)->FindClass (jvm_env, "java.lang.Double");
259 if (c_double == NULL)
261 ERROR ("java plugin: ctoj_jdouble_to_number: Looking up the "
262 "java.lang.Double class failed.");
266 m_double_constructor = (*jvm_env)->GetMethodID (jvm_env,
267 c_double, "<init>", "(D)V");
268 if (m_double_constructor == NULL)
270 ERROR ("java plugin: ctoj_jdouble_to_number: Looking up the "
271 "`Double (double)' constructor failed.");
275 return ((*jvm_env)->NewObject (jvm_env,
276 c_double, m_double_constructor, value));
277 } /* }}} jobject ctoj_jdouble_to_number */
279 /* Convert a value_t to a java.lang.Number */
280 static jobject ctoj_value_to_number (JNIEnv *jvm_env, /* {{{ */
281 value_t value, int ds_type)
283 if (ds_type == DS_TYPE_COUNTER)
284 return (ctoj_jlong_to_number (jvm_env, (jlong) value.counter));
285 else if (ds_type == DS_TYPE_GAUGE)
286 return (ctoj_jdouble_to_number (jvm_env, (jdouble) value.gauge));
289 } /* }}} jobject ctoj_value_to_number */
291 /* Convert a data_source_t to a org.collectd.api.DataSource */
292 static jobject ctoj_data_source (JNIEnv *jvm_env, /* {{{ */
293 const data_source_t *dsrc)
296 jmethodID m_datasource_constructor;
297 jobject o_datasource;
300 /* Look up the DataSource class */
301 c_datasource = (*jvm_env)->FindClass (jvm_env,
302 "org.collectd.api.DataSource");
303 if (c_datasource == NULL)
305 ERROR ("java plugin: ctoj_data_source: "
306 "FindClass (org.collectd.api.DataSource) failed.");
310 /* Lookup the `ValueList ()' constructor. */
311 m_datasource_constructor = (*jvm_env)->GetMethodID (jvm_env, c_datasource,
313 if (m_datasource_constructor == NULL)
315 ERROR ("java plugin: ctoj_data_source: Cannot find the "
316 "`DataSource ()' constructor.");
320 /* Create a new instance. */
321 o_datasource = (*jvm_env)->NewObject (jvm_env, c_datasource,
322 m_datasource_constructor);
323 if (o_datasource == NULL)
325 ERROR ("java plugin: ctoj_data_source: "
326 "Creating a new DataSource instance failed.");
330 /* Set name via `void setName (String name)' */
331 status = ctoj_string (jvm_env, dsrc->name,
332 c_datasource, o_datasource, "setName");
335 ERROR ("java plugin: ctoj_data_source: "
336 "ctoj_string (setName) failed.");
337 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
341 /* Set type via `void setType (int type)' */
342 status = ctoj_int (jvm_env, dsrc->type,
343 c_datasource, o_datasource, "setType");
346 ERROR ("java plugin: ctoj_data_source: "
347 "ctoj_int (setType) failed.");
348 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
352 /* Set min via `void setMin (double min)' */
353 status = ctoj_double (jvm_env, dsrc->min,
354 c_datasource, o_datasource, "setMin");
357 ERROR ("java plugin: ctoj_data_source: "
358 "ctoj_double (setMin) failed.");
359 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
363 /* Set max via `void setMax (double max)' */
364 status = ctoj_double (jvm_env, dsrc->max,
365 c_datasource, o_datasource, "setMax");
368 ERROR ("java plugin: ctoj_data_source: "
369 "ctoj_double (setMax) failed.");
370 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
374 return (o_datasource);
375 } /* }}} jobject ctoj_data_source */
377 /* Convert a oconfig_value_t to a org.collectd.api.OConfigValue */
378 static jobject ctoj_oconfig_value (JNIEnv *jvm_env, /* {{{ */
379 oconfig_value_t ocvalue)
382 jmethodID m_ocvalue_constructor;
386 m_ocvalue_constructor = NULL;
389 c_ocvalue = (*jvm_env)->FindClass (jvm_env,
390 "org.collectd.api.OConfigValue");
391 if (c_ocvalue == NULL)
393 ERROR ("java plugin: ctoj_oconfig_value: "
394 "FindClass (org.collectd.api.OConfigValue) failed.");
398 if (ocvalue.type == OCONFIG_TYPE_BOOLEAN)
400 jboolean tmp_boolean;
402 tmp_boolean = (ocvalue.value.boolean == 0) ? JNI_FALSE : JNI_TRUE;
404 m_ocvalue_constructor = (*jvm_env)->GetMethodID (jvm_env, c_ocvalue,
406 if (m_ocvalue_constructor == NULL)
408 ERROR ("java plugin: ctoj_oconfig_value: Cannot find the "
409 "`OConfigValue (boolean)' constructor.");
413 return ((*jvm_env)->NewObject (jvm_env,
414 c_ocvalue, m_ocvalue_constructor, tmp_boolean));
415 } /* if (ocvalue.type == OCONFIG_TYPE_BOOLEAN) */
416 else if (ocvalue.type == OCONFIG_TYPE_STRING)
418 m_ocvalue_constructor = (*jvm_env)->GetMethodID (jvm_env, c_ocvalue,
419 "<init>", "(Ljava/lang/String;)V");
420 if (m_ocvalue_constructor == NULL)
422 ERROR ("java plugin: ctoj_oconfig_value: Cannot find the "
423 "`OConfigValue (String)' constructor.");
427 o_argument = (*jvm_env)->NewStringUTF (jvm_env, ocvalue.value.string);
428 if (o_argument == NULL)
430 ERROR ("java plugin: ctoj_oconfig_value: "
431 "Creating a String object failed.");
435 else if (ocvalue.type == OCONFIG_TYPE_NUMBER)
437 m_ocvalue_constructor = (*jvm_env)->GetMethodID (jvm_env, c_ocvalue,
438 "<init>", "(Ljava/lang/Number;)V");
439 if (m_ocvalue_constructor == NULL)
441 ERROR ("java plugin: ctoj_oconfig_value: Cannot find the "
442 "`OConfigValue (Number)' constructor.");
446 o_argument = ctoj_jdouble_to_number (jvm_env,
447 (jdouble) ocvalue.value.number);
448 if (o_argument == NULL)
450 ERROR ("java plugin: ctoj_oconfig_value: "
451 "Creating a Number object failed.");
460 assert (m_ocvalue_constructor != NULL);
461 assert (o_argument != NULL);
463 o_ocvalue = (*jvm_env)->NewObject (jvm_env,
464 c_ocvalue, m_ocvalue_constructor, o_argument);
465 if (o_ocvalue == NULL)
467 ERROR ("java plugin: ctoj_oconfig_value: "
468 "Creating an OConfigValue object failed.");
469 (*jvm_env)->DeleteLocalRef (jvm_env, o_argument);
473 (*jvm_env)->DeleteLocalRef (jvm_env, o_argument);
475 } /* }}} jobject ctoj_oconfig_value */
477 /* Convert a oconfig_item_t to a org.collectd.api.OConfigItem */
478 static jobject ctoj_oconfig_item (JNIEnv *jvm_env, /* {{{ */
479 const oconfig_item_t *ci)
482 jmethodID m_ocitem_constructor;
483 jmethodID m_addvalue;
484 jmethodID m_addchild;
489 c_ocitem = (*jvm_env)->FindClass (jvm_env, "org.collectd.api.OConfigItem");
490 if (c_ocitem == NULL)
492 ERROR ("java plugin: ctoj_oconfig_item: "
493 "FindClass (org.collectd.api.OConfigItem) failed.");
497 /* Get the required methods: m_ocitem_constructor, m_addvalue, and m_addchild
499 m_ocitem_constructor = (*jvm_env)->GetMethodID (jvm_env, c_ocitem,
500 "<init>", "(Ljava/lang/String;)V");
501 if (m_ocitem_constructor == NULL)
503 ERROR ("java plugin: ctoj_oconfig_item: Cannot find the "
504 "`OConfigItem (String)' constructor.");
508 m_addvalue = (*jvm_env)->GetMethodID (jvm_env, c_ocitem,
509 "addValue", "(Lorg/collectd/api/OConfigValue;)V");
510 if (m_addvalue == NULL)
512 ERROR ("java plugin: ctoj_oconfig_item: Cannot find the "
513 "`addValue (OConfigValue)' method.");
517 m_addchild = (*jvm_env)->GetMethodID (jvm_env, c_ocitem,
518 "addChild", "(Lorg/collectd/api/OConfigItem;)V");
519 if (m_addchild == NULL)
521 ERROR ("java plugin: ctoj_oconfig_item: Cannot find the "
522 "`addChild (OConfigItem)' method.");
527 /* Create a String object with the key.
528 * Needed for calling the constructor. */
529 o_key = (*jvm_env)->NewStringUTF (jvm_env, ci->key);
532 ERROR ("java plugin: ctoj_oconfig_item: "
533 "Creating String object failed.");
537 /* Create an OConfigItem object */
538 o_ocitem = (*jvm_env)->NewObject (jvm_env,
539 c_ocitem, m_ocitem_constructor, o_key);
540 if (o_ocitem == NULL)
542 ERROR ("java plugin: ctoj_oconfig_item: "
543 "Creating an OConfigItem object failed.");
544 (*jvm_env)->DeleteLocalRef (jvm_env, o_key);
548 /* We don't need the String object any longer.. */
549 (*jvm_env)->DeleteLocalRef (jvm_env, o_key);
551 /* Call OConfigItem.addValue for each value */
552 for (i = 0; i < ci->values_num; i++) /* {{{ */
556 o_value = ctoj_oconfig_value (jvm_env, ci->values[i]);
559 ERROR ("java plugin: ctoj_oconfig_item: "
560 "Creating an OConfigValue object failed.");
561 (*jvm_env)->DeleteLocalRef (jvm_env, o_ocitem);
565 (*jvm_env)->CallVoidMethod (jvm_env, o_ocitem, m_addvalue, o_value);
566 (*jvm_env)->DeleteLocalRef (jvm_env, o_value);
567 } /* }}} for (i = 0; i < ci->values_num; i++) */
569 /* Call OConfigItem.addChild for each child */
570 for (i = 0; i < ci->children_num; i++) /* {{{ */
574 o_child = ctoj_oconfig_item (jvm_env, ci->children + i);
577 ERROR ("java plugin: ctoj_oconfig_item: "
578 "Creating an OConfigItem object failed.");
579 (*jvm_env)->DeleteLocalRef (jvm_env, o_ocitem);
583 (*jvm_env)->CallVoidMethod (jvm_env, o_ocitem, m_addvalue, o_child);
584 (*jvm_env)->DeleteLocalRef (jvm_env, o_child);
585 } /* }}} for (i = 0; i < ci->children_num; i++) */
588 } /* }}} jobject ctoj_oconfig_item */
590 /* Convert a data_set_t to a org.collectd.api.DataSet */
591 static jobject ctoj_data_set (JNIEnv *jvm_env, const data_set_t *ds) /* {{{ */
594 jmethodID m_constructor;
600 /* Look up the org.collectd.api.DataSet class */
601 c_dataset = (*jvm_env)->FindClass (jvm_env, "org.collectd.api.DataSet");
602 if (c_dataset == NULL)
604 ERROR ("java plugin: ctoj_data_set: Looking up the "
605 "org.collectd.api.DataSet class failed.");
609 /* Search for the `DataSet (String type)' constructor. */
610 m_constructor = (*jvm_env)->GetMethodID (jvm_env,
611 c_dataset, "<init>", "(Ljava.lang.String;)V");
612 if (m_constructor == NULL)
614 ERROR ("java plugin: ctoj_data_set: Looking up the "
615 "`DataSet (String)' constructor failed.");
619 /* Search for the `void addDataSource (DataSource)' method. */
620 m_add = (*jvm_env)->GetMethodID (jvm_env,
621 c_dataset, "addDataSource", "(Lorg.collectd.api.DataSource;)V");
624 ERROR ("java plugin: ctoj_data_set: Looking up the "
625 "`addDataSource (DataSource)' method failed.");
629 o_type = (*jvm_env)->NewStringUTF (jvm_env, ds->type);
632 ERROR ("java plugin: ctoj_data_set: Creating a String object failed.");
636 o_dataset = (*jvm_env)->NewObject (jvm_env,
637 c_dataset, m_constructor, o_type);
638 if (o_dataset == NULL)
640 ERROR ("java plugin: ctoj_data_set: Creating a DataSet object failed.");
641 (*jvm_env)->DeleteLocalRef (jvm_env, o_type);
645 /* Decrease reference counter on the java.lang.String object. */
646 (*jvm_env)->DeleteLocalRef (jvm_env, o_type);
648 for (i = 0; i < ds->ds_num; i++)
650 jobject o_datasource;
652 o_datasource = ctoj_data_source (jvm_env, ds->ds + i);
653 if (o_datasource == NULL)
655 ERROR ("java plugin: ctoj_data_set: ctoj_data_source (%s.%s) failed",
656 ds->type, ds->ds[i].name);
657 (*jvm_env)->DeleteLocalRef (jvm_env, o_dataset);
661 (*jvm_env)->CallVoidMethod (jvm_env, o_dataset, m_add, o_datasource);
663 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
664 } /* for (i = 0; i < ds->ds_num; i++) */
667 } /* }}} jobject ctoj_data_set */
669 static int ctoj_value_list_add_value (JNIEnv *jvm_env, /* {{{ */
670 value_t value, int ds_type,
671 jclass class_ptr, jobject object_ptr)
673 jmethodID m_addvalue;
676 m_addvalue = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
677 "addValue", "(Ljava/lang/Number;)V");
678 if (m_addvalue == NULL)
680 ERROR ("java plugin: ctoj_value_list_add_value: "
681 "Cannot find method `void addValue (Number)'.");
685 o_number = ctoj_value_to_number (jvm_env, value, ds_type);
686 if (o_number == NULL)
688 ERROR ("java plugin: ctoj_value_list_add_value: "
689 "ctoj_value_to_number failed.");
693 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_addvalue, o_number);
695 (*jvm_env)->DeleteLocalRef (jvm_env, o_number);
698 } /* }}} int ctoj_value_list_add_value */
700 static int ctoj_value_list_add_data_set (JNIEnv *jvm_env, /* {{{ */
701 jclass c_valuelist, jobject o_valuelist, const data_set_t *ds)
703 jmethodID m_setdataset;
706 /* Look for the `void setDataSource (List<DataSource> ds)' method. */
707 m_setdataset = (*jvm_env)->GetMethodID (jvm_env, c_valuelist,
708 "setDataSet", "(Lorg.collectd.api.DataSet;)V");
709 if (m_setdataset == NULL)
711 ERROR ("java plugin: ctoj_value_list_add_data_set: "
712 "Cannot find the `void setDataSet (DataSet)' method.");
716 /* Create a DataSet object. */
717 o_dataset = ctoj_data_set (jvm_env, ds);
718 if (o_dataset == NULL)
720 ERROR ("java plugin: ctoj_value_list_add_data_set: "
721 "ctoj_data_set (%s) failed.", ds->type);
725 /* Actually call the method. */
726 (*jvm_env)->CallVoidMethod (jvm_env,
727 o_valuelist, m_setdataset, o_dataset);
729 /* Decrease reference counter on the List<DataSource> object. */
730 (*jvm_env)->DeleteLocalRef (jvm_env, o_dataset);
733 } /* }}} int ctoj_value_list_add_data_set */
735 /* Convert a value_list_t (and data_set_t) to a org.collectd.api.ValueList */
736 static jobject ctoj_value_list (JNIEnv *jvm_env, /* {{{ */
737 const data_set_t *ds, const value_list_t *vl)
740 jmethodID m_valuelist_constructor;
745 /* First, create a new ValueList instance..
746 * Look up the class.. */
747 c_valuelist = (*jvm_env)->FindClass (jvm_env,
748 "org.collectd.api.ValueList");
749 if (c_valuelist == NULL)
751 ERROR ("java plugin: ctoj_value_list: "
752 "FindClass (org.collectd.api.ValueList) failed.");
756 /* Lookup the `ValueList ()' constructor. */
757 m_valuelist_constructor = (*jvm_env)->GetMethodID (jvm_env, c_valuelist,
759 if (m_valuelist_constructor == NULL)
761 ERROR ("java plugin: ctoj_value_list: Cannot find the "
762 "`ValueList ()' constructor.");
766 /* Create a new instance. */
767 o_valuelist = (*jvm_env)->NewObject (jvm_env, c_valuelist,
768 m_valuelist_constructor);
769 if (o_valuelist == NULL)
771 ERROR ("java plugin: ctoj_value_list: Creating a new ValueList instance "
776 status = ctoj_value_list_add_data_set (jvm_env,
777 c_valuelist, o_valuelist, ds);
780 ERROR ("java plugin: ctoj_value_list: "
781 "ctoj_value_list_add_data_set failed.");
782 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist);
786 /* Set the strings.. */
787 #define SET_STRING(str,method_name) do { \
788 status = ctoj_string (jvm_env, str, \
789 c_valuelist, o_valuelist, method_name); \
791 ERROR ("java plugin: ctoj_value_list: jtoc_string (%s) failed.", \
793 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist); \
797 SET_STRING (vl->host, "setHost");
798 SET_STRING (vl->plugin, "setPlugin");
799 SET_STRING (vl->plugin_instance, "setPluginInstance");
800 SET_STRING (vl->type, "setType");
801 SET_STRING (vl->type_instance, "setTypeInstance");
805 /* Set the `time' member. Java stores time in milliseconds. */
806 status = ctoj_long (jvm_env, ((jlong) vl->time) * ((jlong) 1000),
807 c_valuelist, o_valuelist, "setTime");
810 ERROR ("java plugin: ctoj_value_list: ctoj_long (setTime) failed.");
811 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist);
815 /* Set the `interval' member.. */
816 status = ctoj_long (jvm_env, (jlong) vl->interval,
817 c_valuelist, o_valuelist, "setInterval");
820 ERROR ("java plugin: ctoj_value_list: ctoj_long (setInterval) failed.");
821 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist);
825 for (i = 0; i < vl->values_len; i++)
827 status = ctoj_value_list_add_value (jvm_env, vl->values[i], ds->ds[i].type,
828 c_valuelist, o_valuelist);
831 ERROR ("java plugin: ctoj_value_list: "
832 "ctoj_value_list_add_value failed.");
833 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist);
838 return (o_valuelist);
839 } /* }}} int ctoj_value_list */
842 * Java to C conversion functions
844 /* Call a `String <method> ()' method. */
845 static int jtoc_string (JNIEnv *jvm_env, /* {{{ */
846 char *buffer, size_t buffer_size,
847 jclass class_ptr, jobject object_ptr, const char *method_name)
853 method_id = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
854 method_name, "()Ljava/lang/String;");
855 if (method_id == NULL)
857 ERROR ("java plugin: jtoc_string: Cannot find method `String %s ()'.",
862 string_obj = (*jvm_env)->CallObjectMethod (jvm_env, object_ptr, method_id);
863 if (string_obj == NULL)
865 ERROR ("java plugin: jtoc_string: CallObjectMethod (%s) failed.",
870 c_str = (*jvm_env)->GetStringUTFChars (jvm_env, string_obj, 0);
873 ERROR ("java plugin: jtoc_string: GetStringUTFChars failed.");
874 (*jvm_env)->DeleteLocalRef (jvm_env, string_obj);
878 sstrncpy (buffer, c_str, buffer_size);
880 (*jvm_env)->ReleaseStringUTFChars (jvm_env, string_obj, c_str);
881 (*jvm_env)->DeleteLocalRef (jvm_env, string_obj);
884 } /* }}} int jtoc_string */
886 /* Call a `long <method> ()' method. */
887 static int jtoc_long (JNIEnv *jvm_env, /* {{{ */
889 jclass class_ptr, jobject object_ptr, const char *method_name)
893 method_id = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
895 if (method_id == NULL)
897 ERROR ("java plugin: jtoc_long: Cannot find method `long %s ()'.",
902 *ret_value = (*jvm_env)->CallLongMethod (jvm_env, object_ptr, method_id);
905 } /* }}} int jtoc_long */
907 /* Call a `double <method> ()' method. */
908 static int jtoc_double (JNIEnv *jvm_env, /* {{{ */
910 jclass class_ptr, jobject object_ptr, const char *method_name)
914 method_id = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
916 if (method_id == NULL)
918 ERROR ("java plugin: jtoc_string: Cannot find method `double %s ()'.",
923 *ret_value = (*jvm_env)->CallDoubleMethod (jvm_env, object_ptr, method_id);
926 } /* }}} int jtoc_double */
928 static int jtoc_value (JNIEnv *jvm_env, /* {{{ */
929 value_t *ret_value, int ds_type, jobject object_ptr)
934 class_ptr = (*jvm_env)->GetObjectClass (jvm_env, object_ptr);
936 if (ds_type == DS_TYPE_COUNTER)
940 status = jtoc_long (jvm_env, &tmp_long,
941 class_ptr, object_ptr, "longValue");
944 ERROR ("java plugin: jtoc_value: "
945 "jtoc_long failed.");
948 (*ret_value).counter = (counter_t) tmp_long;
954 status = jtoc_double (jvm_env, &tmp_double,
955 class_ptr, object_ptr, "doubleValue");
958 ERROR ("java plugin: jtoc_value: "
959 "jtoc_double failed.");
962 (*ret_value).gauge = (gauge_t) tmp_double;
966 } /* }}} int jtoc_value */
968 /* Read a List<Number>, convert it to `value_t' and add it to the given
970 static int jtoc_values_array (JNIEnv *jvm_env, /* {{{ */
971 const data_set_t *ds, value_list_t *vl,
972 jclass class_ptr, jobject object_ptr)
974 jmethodID m_getvalues;
977 jobjectArray o_number_array;
983 values_num = ds->ds_num;
986 o_number_array = NULL;
989 #define BAIL_OUT(status) \
991 if (o_number_array != NULL) \
992 (*jvm_env)->DeleteLocalRef (jvm_env, o_number_array); \
993 if (o_list != NULL) \
994 (*jvm_env)->DeleteLocalRef (jvm_env, o_list); \
997 /* Call: List<Number> ValueList.getValues () */
998 m_getvalues = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
999 "getValues", "()Ljava/util/List;");
1000 if (m_getvalues == NULL)
1002 ERROR ("java plugin: jtoc_values_array: "
1003 "Cannot find method `List getValues ()'.");
1007 o_list = (*jvm_env)->CallObjectMethod (jvm_env, object_ptr, m_getvalues);
1010 ERROR ("java plugin: jtoc_values_array: "
1011 "CallObjectMethod (getValues) failed.");
1015 /* Call: Number[] List.toArray () */
1016 m_toarray = (*jvm_env)->GetMethodID (jvm_env,
1017 (*jvm_env)->GetObjectClass (jvm_env, o_list),
1018 "toArray", "()[Ljava/lang/Object;");
1019 if (m_toarray == NULL)
1021 ERROR ("java plugin: jtoc_values_array: "
1022 "Cannot find method `Object[] toArray ()'.");
1026 o_number_array = (*jvm_env)->CallObjectMethod (jvm_env, o_list, m_toarray);
1027 if (o_number_array == NULL)
1029 ERROR ("java plugin: jtoc_values_array: "
1030 "CallObjectMethod (toArray) failed.");
1034 values = (value_t *) calloc (values_num, sizeof (value_t));
1037 ERROR ("java plugin: jtoc_values_array: calloc failed.");
1041 for (i = 0; i < values_num; i++)
1046 o_number = (*jvm_env)->GetObjectArrayElement (jvm_env,
1047 o_number_array, (jsize) i);
1048 if (o_number == NULL)
1050 ERROR ("java plugin: jtoc_values_array: "
1051 "GetObjectArrayElement (%i) failed.", i);
1055 status = jtoc_value (jvm_env, values + i, ds->ds[i].type, o_number);
1058 ERROR ("java plugin: jtoc_values_array: "
1059 "jtoc_value (%i) failed.", i);
1062 } /* for (i = 0; i < values_num; i++) */
1064 vl->values = values;
1065 vl->values_len = values_num;
1068 (*jvm_env)->DeleteLocalRef (jvm_env, o_number_array);
1069 (*jvm_env)->DeleteLocalRef (jvm_env, o_list);
1071 } /* }}} int jtoc_values_array */
1073 /* Convert a org.collectd.api.ValueList to a value_list_t. */
1074 static int jtoc_value_list (JNIEnv *jvm_env, value_list_t *vl, /* {{{ */
1080 const data_set_t *ds;
1082 class_ptr = (*jvm_env)->GetObjectClass (jvm_env, object_ptr);
1083 if (class_ptr == NULL)
1085 ERROR ("java plugin: jtoc_value_list: GetObjectClass failed.");
1089 #define SET_STRING(buffer,method) do { \
1090 status = jtoc_string (jvm_env, buffer, sizeof (buffer), \
1091 class_ptr, object_ptr, method); \
1092 if (status != 0) { \
1093 ERROR ("java plugin: jtoc_value_list: jtoc_string (%s) failed.", \
1098 SET_STRING(vl->type, "getType");
1100 ds = plugin_get_ds (vl->type);
1103 ERROR ("java plugin: jtoc_value_list: Data-set `%s' is not defined. "
1104 "Please consult the types.db(5) manpage for mor information.",
1109 SET_STRING(vl->host, "getHost");
1110 SET_STRING(vl->plugin, "getPlugin");
1111 SET_STRING(vl->plugin_instance, "getPluginInstance");
1112 SET_STRING(vl->type_instance, "getTypeInstance");
1116 status = jtoc_long (jvm_env, &tmp_long, class_ptr, object_ptr, "getTime");
1119 ERROR ("java plugin: jtoc_value_list: jtoc_long (getTime) failed.");
1122 /* Java measures time in milliseconds. */
1123 vl->time = (time_t) (tmp_long / ((jlong) 1000));
1125 status = jtoc_long (jvm_env, &tmp_long,
1126 class_ptr, object_ptr, "getInterval");
1129 ERROR ("java plugin: jtoc_value_list: jtoc_long (getInterval) failed.");
1132 vl->interval = (int) tmp_long;
1134 status = jtoc_values_array (jvm_env, ds, vl, class_ptr, object_ptr);
1137 ERROR ("java plugin: jtoc_value_list: jtoc_values_array failed.");
1142 } /* }}} int jtoc_value_list */
1145 * Functions accessible from Java
1147 static jint JNICALL cjni_api_dispatch_values (JNIEnv *jvm_env, /* {{{ */
1148 jobject this, jobject java_vl)
1150 value_list_t vl = VALUE_LIST_INIT;
1153 DEBUG ("cjni_api_dispatch_values: java_vl = %p;", (void *) java_vl);
1155 status = jtoc_value_list (jvm_env, &vl, java_vl);
1158 ERROR ("java plugin: cjni_api_dispatch_values: jtoc_value_list failed.");
1162 status = plugin_dispatch_values (&vl);
1167 } /* }}} jint cjni_api_dispatch_values */
1169 static jobject JNICALL cjni_api_get_ds (JNIEnv *jvm_env, /* {{{ */
1170 jobject this, jobject o_string_type)
1172 const char *ds_name;
1173 const data_set_t *ds;
1176 ds_name = (*jvm_env)->GetStringUTFChars (jvm_env, o_string_type, 0);
1177 if (ds_name == NULL)
1179 ERROR ("java plugin: cjni_api_get_ds: GetStringUTFChars failed.");
1183 ds = plugin_get_ds (ds_name);
1184 DEBUG ("java plugin: cjni_api_get_ds: "
1185 "plugin_get_ds (%s) = %p;", ds_name, (void *) ds);
1187 (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_string_type, ds_name);
1192 o_dataset = ctoj_data_set (jvm_env, ds);
1194 } /* }}} jint cjni_api_get_ds */
1196 static jint JNICALL cjni_api_register_config (JNIEnv *jvm_env, /* {{{ */
1197 jobject this, jobject o_name, jobject o_config)
1199 return (cjni_callback_register (jvm_env, o_name, o_config, CB_TYPE_CONFIG));
1200 } /* }}} jint cjni_api_register_config */
1202 static jint JNICALL cjni_api_register_init (JNIEnv *jvm_env, /* {{{ */
1203 jobject this, jobject o_name, jobject o_config)
1205 return (cjni_callback_register (jvm_env, o_name, o_config, CB_TYPE_INIT));
1206 } /* }}} jint cjni_api_register_init */
1208 static jint JNICALL cjni_api_register_read (JNIEnv *jvm_env, /* {{{ */
1209 jobject this, jobject o_name, jobject o_read)
1212 cjni_callback_info_t *cbi;
1214 cbi = cjni_callback_info_create (jvm_env, o_name, o_read, CB_TYPE_READ);
1218 DEBUG ("java plugin: Registering new read callback: %s", cbi->name);
1220 memset (&ud, 0, sizeof (ud));
1221 ud.data = (void *) cbi;
1222 ud.free_func = cjni_callback_info_destroy;
1224 plugin_register_complex_read (cbi->name, cjni_read, &ud);
1226 (*jvm_env)->DeleteLocalRef (jvm_env, o_read);
1229 } /* }}} jint cjni_api_register_read */
1231 static jint JNICALL cjni_api_register_write (JNIEnv *jvm_env, /* {{{ */
1232 jobject this, jobject o_name, jobject o_write)
1235 cjni_callback_info_t *cbi;
1237 cbi = cjni_callback_info_create (jvm_env, o_name, o_write, CB_TYPE_WRITE);
1241 DEBUG ("java plugin: Registering new write callback: %s", cbi->name);
1243 memset (&ud, 0, sizeof (ud));
1244 ud.data = (void *) cbi;
1245 ud.free_func = cjni_callback_info_destroy;
1247 plugin_register_write (cbi->name, cjni_write, &ud);
1249 (*jvm_env)->DeleteLocalRef (jvm_env, o_write);
1252 } /* }}} jint cjni_api_register_write */
1254 static jint JNICALL cjni_api_register_flush (JNIEnv *jvm_env, /* {{{ */
1255 jobject this, jobject o_name, jobject o_flush)
1258 cjni_callback_info_t *cbi;
1260 cbi = cjni_callback_info_create (jvm_env, o_name, o_flush, CB_TYPE_FLUSH);
1264 DEBUG ("java plugin: Registering new flush callback: %s", cbi->name);
1266 memset (&ud, 0, sizeof (ud));
1267 ud.data = (void *) cbi;
1268 ud.free_func = cjni_callback_info_destroy;
1270 plugin_register_flush (cbi->name, cjni_flush, &ud);
1272 (*jvm_env)->DeleteLocalRef (jvm_env, o_flush);
1275 } /* }}} jint cjni_api_register_flush */
1277 static jint JNICALL cjni_api_register_shutdown (JNIEnv *jvm_env, /* {{{ */
1278 jobject this, jobject o_name, jobject o_shutdown)
1280 return (cjni_callback_register (jvm_env, o_name, o_shutdown,
1282 } /* }}} jint cjni_api_register_shutdown */
1284 static jint JNICALL cjni_api_register_log (JNIEnv *jvm_env, /* {{{ */
1285 jobject this, jobject o_name, jobject o_log)
1288 cjni_callback_info_t *cbi;
1290 cbi = cjni_callback_info_create (jvm_env, o_name, o_log, CB_TYPE_LOG);
1294 DEBUG ("java plugin: Registering new log callback: %s", cbi->name);
1296 memset (&ud, 0, sizeof (ud));
1297 ud.data = (void *) cbi;
1298 ud.free_func = cjni_callback_info_destroy;
1300 plugin_register_log (cbi->name, cjni_log, &ud);
1302 (*jvm_env)->DeleteLocalRef (jvm_env, o_log);
1305 } /* }}} jint cjni_api_register_log */
1307 static void JNICALL cjni_api_log (JNIEnv *jvm_env, /* {{{ */
1308 jobject this, jint severity, jobject o_message)
1312 c_str = (*jvm_env)->GetStringUTFChars (jvm_env, o_message, 0);
1315 ERROR ("java plugin: cjni_api_log: GetStringUTFChars failed.");
1319 if (severity < LOG_ERR)
1321 if (severity > LOG_DEBUG)
1322 severity = LOG_DEBUG;
1324 plugin_log (severity, "%s", c_str);
1326 (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_message, c_str);
1327 } /* }}} void cjni_api_log */
1329 /* List of ``native'' functions, i. e. C-functions that can be called from
1331 static JNINativeMethod jni_api_functions[] = /* {{{ */
1334 "(Lorg/collectd/api/ValueList;)I",
1335 cjni_api_dispatch_values },
1338 "(Ljava/lang/String;)Lorg/collectd/api/DataSet;",
1342 "(Ljava/lang/String;Lorg/collectd/api/CollectdConfigInterface;)I",
1343 cjni_api_register_config },
1346 "(Ljava/lang/String;Lorg/collectd/api/CollectdInitInterface;)I",
1347 cjni_api_register_init },
1350 "(Ljava/lang/String;Lorg/collectd/api/CollectdReadInterface;)I",
1351 cjni_api_register_read },
1354 "(Ljava/lang/String;Lorg/collectd/api/CollectdWriteInterface;)I",
1355 cjni_api_register_write },
1358 "(Ljava/lang/String;Lorg/collectd/api/CollectdFlushInterface;)I",
1359 cjni_api_register_flush },
1361 { "registerShutdown",
1362 "(Ljava/lang/String;Lorg/collectd/api/CollectdShutdownInterface;)I",
1363 cjni_api_register_shutdown },
1366 "(Ljava/lang/String;Lorg/collectd/api/CollectdLogInterface;)I",
1367 cjni_api_register_log },
1370 "(ILjava/lang/String;)V",
1373 static size_t jni_api_functions_num = sizeof (jni_api_functions)
1374 / sizeof (jni_api_functions[0]);
1380 /* Allocate a `cjni_callback_info_t' given the type and objects necessary for
1381 * all registration functions. */
1382 static cjni_callback_info_t *cjni_callback_info_create (JNIEnv *jvm_env, /* {{{ */
1383 jobject o_name, jobject o_callback, int type)
1386 cjni_callback_info_t *cbi;
1387 const char *method_name;
1388 const char *method_signature;
1392 case CB_TYPE_CONFIG:
1393 method_name = "config";
1394 method_signature = "(Lorg/collectd/api/OConfigItem;)I";
1398 method_name = "init";
1399 method_signature = "()I";
1403 method_name = "read";
1404 method_signature = "()I";
1408 method_name = "write";
1409 method_signature = "(Lorg/collectd/api/ValueList;)I";
1413 method_name = "flush";
1414 method_signature = "(ILjava/lang/String;)I";
1417 case CB_TYPE_SHUTDOWN:
1418 method_name = "shutdown";
1419 method_signature = "()I";
1423 method_name = "log";
1424 method_signature = "(ILjava/lang/String;)V";
1428 ERROR ("java plugin: cjni_callback_info_create: Unknown type: %#x",
1433 c_name = (*jvm_env)->GetStringUTFChars (jvm_env, o_name, 0);
1436 ERROR ("java plugin: cjni_callback_info_create: "
1437 "GetStringUTFChars failed.");
1441 cbi = (cjni_callback_info_t *) malloc (sizeof (*cbi));
1444 ERROR ("java plugin: cjni_callback_info_create: malloc failed.");
1445 (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_name, c_name);
1448 memset (cbi, 0, sizeof (*cbi));
1451 cbi->name = strdup (c_name);
1452 if (cbi->name == NULL)
1454 pthread_mutex_unlock (&java_callbacks_lock);
1455 ERROR ("java plugin: cjni_callback_info_create: strdup failed.");
1456 (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_name, c_name);
1460 (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_name, c_name);
1462 cbi->class = (*jvm_env)->GetObjectClass (jvm_env, o_callback);
1463 if (cbi->class == NULL)
1465 ERROR ("java plugin: cjni_callback_info_create: GetObjectClass failed.");
1470 cbi->object = o_callback;
1472 cbi->method = (*jvm_env)->GetMethodID (jvm_env, cbi->class,
1473 method_name, method_signature);
1474 if (cbi->method == NULL)
1476 ERROR ("java plugin: cjni_callback_info_create: "
1477 "Cannot find the `%s' method with signature `%s'.",
1478 method_name, method_signature);
1483 (*jvm_env)->NewGlobalRef (jvm_env, o_callback);
1486 } /* }}} cjni_callback_info_t cjni_callback_info_create */
1488 /* Allocate a `cjni_callback_info_t' via `cjni_callback_info_create' and add it
1489 * to the global `java_callbacks' variable. This is used for `config', `init',
1490 * and `shutdown' callbacks. */
1491 static int cjni_callback_register (JNIEnv *jvm_env, /* {{{ */
1492 jobject o_name, jobject o_callback, int type)
1494 cjni_callback_info_t *cbi;
1495 cjni_callback_info_t *tmp;
1497 const char *type_str;
1500 cbi = cjni_callback_info_create (jvm_env, o_name, o_callback, type);
1507 case CB_TYPE_CONFIG:
1508 type_str = "config";
1515 case CB_TYPE_SHUTDOWN:
1516 type_str = "shutdown";
1520 type_str = "<unknown>";
1522 DEBUG ("java plugin: Registering new %s callback: %s",
1523 type_str, cbi->name);
1526 pthread_mutex_lock (&java_callbacks_lock);
1528 tmp = (cjni_callback_info_t *) realloc (java_callbacks,
1529 (java_callbacks_num + 1) * sizeof (*java_callbacks));
1532 pthread_mutex_unlock (&java_callbacks_lock);
1533 ERROR ("java plugin: cjni_callback_register: realloc failed.");
1535 (*jvm_env)->DeleteGlobalRef (jvm_env, cbi->object);
1540 java_callbacks = tmp;
1541 java_callbacks[java_callbacks_num] = *cbi;
1542 java_callbacks_num++;
1544 pthread_mutex_unlock (&java_callbacks_lock);
1548 } /* }}} int cjni_callback_register */
1550 /* Increase the reference counter to the JVM for this thread. If it was zero,
1551 * attach the JVM first. */
1552 static JNIEnv *cjni_thread_attach (void) /* {{{ */
1554 cjni_jvm_env_t *cjni_env;
1557 cjni_env = pthread_getspecific (jvm_env_key);
1558 if (cjni_env == NULL)
1560 /* This pointer is free'd in `cjni_jvm_env_destroy'. */
1561 cjni_env = (cjni_jvm_env_t *) malloc (sizeof (*cjni_env));
1562 if (cjni_env == NULL)
1564 ERROR ("java plugin: cjni_thread_attach: malloc failed.");
1567 memset (cjni_env, 0, sizeof (*cjni_env));
1568 cjni_env->reference_counter = 0;
1569 cjni_env->jvm_env = NULL;
1571 pthread_setspecific (jvm_env_key, cjni_env);
1574 if (cjni_env->reference_counter > 0)
1576 cjni_env->reference_counter++;
1577 jvm_env = cjni_env->jvm_env;
1582 JavaVMAttachArgs args;
1584 assert (cjni_env->jvm_env == NULL);
1586 memset (&args, 0, sizeof (args));
1587 args.version = JNI_VERSION_1_2;
1589 status = (*jvm)->AttachCurrentThread (jvm, (void *) &jvm_env, (void *) &args);
1592 ERROR ("java plugin: cjni_thread_attach: AttachCurrentThread failed "
1593 "with status %i.", status);
1597 cjni_env->reference_counter = 1;
1598 cjni_env->jvm_env = jvm_env;
1601 DEBUG ("java plugin: cjni_thread_attach: cjni_env->reference_counter = %i",
1602 cjni_env->reference_counter);
1603 assert (jvm_env != NULL);
1605 } /* }}} JNIEnv *cjni_thread_attach */
1607 /* Decrease the reference counter of this thread. If it reaches zero, detach
1609 static int cjni_thread_detach (void) /* {{{ */
1611 cjni_jvm_env_t *cjni_env;
1614 cjni_env = pthread_getspecific (jvm_env_key);
1615 if (cjni_env == NULL)
1617 ERROR ("java plugin: cjni_thread_detach: pthread_getspecific failed.");
1621 assert (cjni_env->reference_counter > 0);
1622 assert (cjni_env->jvm_env != NULL);
1624 cjni_env->reference_counter--;
1625 DEBUG ("java plugin: cjni_thread_detach: cjni_env->reference_counter = %i",
1626 cjni_env->reference_counter);
1628 if (cjni_env->reference_counter > 0)
1631 status = (*jvm)->DetachCurrentThread (jvm);
1634 ERROR ("java plugin: cjni_thread_detach: DetachCurrentThread failed "
1635 "with status %i.", status);
1638 cjni_env->reference_counter = 0;
1639 cjni_env->jvm_env = NULL;
1642 } /* }}} JNIEnv *cjni_thread_attach */
1644 /* Callback for `pthread_key_create'. It frees the data contained in
1645 * `jvm_env_key' and prints a warning if the reference counter is not zero. */
1646 static void cjni_jvm_env_destroy (void *args) /* {{{ */
1648 cjni_jvm_env_t *cjni_env;
1653 cjni_env = (cjni_jvm_env_t *) args;
1655 if (cjni_env->reference_counter > 0)
1657 ERROR ("java plugin: cjni_jvm_env_destroy: "
1658 "cjni_env->reference_counter = %i;", cjni_env->reference_counter);
1661 if (cjni_env->jvm_env != NULL)
1663 ERROR ("java plugin: cjni_jvm_env_destroy: cjni_env->jvm_env = %p;",
1664 (void *) cjni_env->jvm_env);
1667 /* The pointer is allocated in `cjni_thread_attach' */
1669 } /* }}} void cjni_jvm_env_destroy */
1671 /* Boring configuration functions.. {{{ */
1672 static int cjni_config_add_jvm_arg (oconfig_item_t *ci) /* {{{ */
1676 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
1678 WARNING ("java plugin: `JVMArg' needs exactly one string argument.");
1682 tmp = (char **) realloc (jvm_argv, sizeof (char *) * (jvm_argc + 1));
1685 ERROR ("java plugin: realloc failed.");
1690 jvm_argv[jvm_argc] = strdup (ci->values[0].value.string);
1691 if (jvm_argv[jvm_argc] == NULL)
1693 ERROR ("java plugin: strdup failed.");
1699 } /* }}} int cjni_config_add_jvm_arg */
1701 static int cjni_config_load_plugin (oconfig_item_t *ci) /* {{{ */
1703 java_plugin_class_t *tmp;
1705 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
1707 WARNING ("java plugin: `LoadPlugin' needs exactly one string argument.");
1711 tmp = (java_plugin_class_t *) realloc (java_classes_list,
1712 (java_classes_list_len + 1) * sizeof (*java_classes_list));
1715 ERROR ("java plugin: realloc failed.");
1718 java_classes_list = tmp;
1719 tmp = java_classes_list + java_classes_list_len;
1721 memset (tmp, 0, sizeof (*tmp));
1722 tmp->name = strdup (ci->values[0].value.string);
1723 if (tmp->name == NULL)
1725 ERROR ("java plugin: strdup failed.");
1731 java_classes_list_len++;
1734 } /* }}} int cjni_config_load_plugin */
1736 static int cjni_config_plugin_block (oconfig_item_t *ci) /* {{{ */
1738 java_plugin_config_t *tmp;
1742 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
1744 WARNING ("java plugin: `Plugin' blocks "
1745 "need exactly one string argument.");
1749 name = strdup (ci->values[0].value.string);
1752 ERROR ("java plugin: cjni_config_plugin_block: strdup faiiled.");
1756 for (i = 0; i < java_plugin_configs_num; i++)
1758 if (strcmp (java_plugin_configs[i].name, name) == 0)
1760 WARNING ("java plugin: There is more than one <Plugin \"%s\"> block. "
1761 "This is currently not supported - "
1762 "only the first block will be used!",
1769 tmp = (java_plugin_config_t *) realloc (java_plugin_configs,
1770 (java_plugin_configs_num + 1) * sizeof (*java_plugin_configs));
1773 ERROR ("java plugin: cjni_config_plugin_block: realloc failed.");
1777 java_plugin_configs = tmp;
1778 tmp = java_plugin_configs + java_plugin_configs_num;
1781 tmp->ci = oconfig_clone (ci);
1782 if (tmp->ci == NULL)
1784 ERROR ("java plugin: cjni_config_plugin_block: "
1785 "oconfig_clone failed for `%s'.",
1791 DEBUG ("java plugin: cjni_config_plugin_block: "
1792 "Successfully copied config for `%s'.",
1795 java_plugin_configs_num++;
1797 } /* }}} int cjni_config_plugin_block */
1799 static int cjni_config (oconfig_item_t *ci) /* {{{ */
1809 for (i = 0; i < ci->children_num; i++)
1811 oconfig_item_t *child = ci->children + i;
1813 if (strcasecmp ("JVMArg", child->key) == 0)
1815 status = cjni_config_add_jvm_arg (child);
1821 else if (strcasecmp ("LoadPlugin", child->key) == 0)
1823 status = cjni_config_load_plugin (child);
1829 else if (strcasecmp ("Plugin", child->key) == 0)
1831 status = cjni_config_plugin_block (child);
1839 WARNING ("java plugin: Option `%s' not allowed here.", child->key);
1844 DEBUG ("java plugin: jvm_argc = %zu;", jvm_argc);
1845 DEBUG ("java plugin: java_classes_list_len = %zu;", java_classes_list_len);
1846 DEBUG ("java plugin: java_plugin_configs_num = %zu;",
1847 java_plugin_configs_num);
1849 if ((success == 0) && (errors > 0))
1851 ERROR ("java plugin: All statements failed.");
1856 } /* }}} int cjni_config */
1859 /* Free the data contained in the `user_data_t' pointer passed to `cjni_read'
1860 * and `cjni_write'. In particular, delete the global reference to the Java
1862 static void cjni_callback_info_destroy (void *arg) /* {{{ */
1865 cjni_callback_info_t *cbi;
1867 DEBUG ("java plugin: cjni_callback_info_destroy (arg = %p);", arg);
1872 jvm_env = cjni_thread_attach ();
1873 if (jvm_env == NULL)
1875 ERROR ("java plugin: cjni_callback_info_destroy: cjni_thread_attach failed.");
1879 cbi = (cjni_callback_info_t *) arg;
1881 (*jvm_env)->DeleteGlobalRef (jvm_env, cbi->object);
1888 cjni_thread_detach ();
1889 } /* }}} void cjni_callback_info_destroy */
1891 /* Call the CB_TYPE_READ callback pointed to by the `user_data_t' pointer. */
1892 static int cjni_read (user_data_t *ud) /* {{{ */
1895 cjni_callback_info_t *cbi;
1900 ERROR ("java plugin: cjni_read: jvm == NULL");
1904 if ((ud == NULL) || (ud->data == NULL))
1906 ERROR ("java plugin: cjni_read: Invalid user data.");
1910 jvm_env = cjni_thread_attach ();
1911 if (jvm_env == NULL)
1914 cbi = (cjni_callback_info_t *) ud->data;
1916 status = (*jvm_env)->CallIntMethod (jvm_env, cbi->object,
1919 status = cjni_thread_detach ();
1922 ERROR ("java plugin: cjni_read: cjni_thread_detach failed.");
1927 } /* }}} int cjni_read */
1929 /* Call the CB_TYPE_WRITE callback pointed to by the `user_data_t' pointer. */
1930 static int cjni_write (const data_set_t *ds, const value_list_t *vl, /* {{{ */
1934 cjni_callback_info_t *cbi;
1940 ERROR ("java plugin: cjni_write: jvm == NULL");
1944 if ((ud == NULL) || (ud->data == NULL))
1946 ERROR ("java plugin: cjni_write: Invalid user data.");
1950 jvm_env = cjni_thread_attach ();
1951 if (jvm_env == NULL)
1954 cbi = (cjni_callback_info_t *) ud->data;
1956 vl_java = ctoj_value_list (jvm_env, ds, vl);
1957 if (vl_java == NULL)
1959 ERROR ("java plugin: cjni_write: ctoj_value_list failed.");
1963 status = (*jvm_env)->CallIntMethod (jvm_env,
1964 cbi->object, cbi->method, vl_java);
1966 (*jvm_env)->DeleteLocalRef (jvm_env, vl_java);
1968 status = cjni_thread_detach ();
1971 ERROR ("java plugin: cjni_write: cjni_thread_detach failed.");
1976 } /* }}} int cjni_write */
1978 /* Call the CB_TYPE_FLUSH callback pointed to by the `user_data_t' pointer. */
1979 static int cjni_flush (int timeout, const char *identifier, /* {{{ */
1983 cjni_callback_info_t *cbi;
1984 jobject o_identifier;
1989 ERROR ("java plugin: cjni_flush: jvm == NULL");
1993 if ((ud == NULL) || (ud->data == NULL))
1995 ERROR ("java plugin: cjni_flush: Invalid user data.");
1999 jvm_env = cjni_thread_attach ();
2000 if (jvm_env == NULL)
2003 cbi = (cjni_callback_info_t *) ud->data;
2005 o_identifier = NULL;
2006 if (identifier != NULL)
2008 o_identifier = (*jvm_env)->NewStringUTF (jvm_env, identifier);
2009 if (o_identifier == NULL)
2011 ERROR ("java plugin: cjni_flush: NewStringUTF failed.");
2016 status = (*jvm_env)->CallIntMethod (jvm_env,
2017 cbi->object, cbi->method, (jint) timeout, o_identifier);
2019 (*jvm_env)->DeleteLocalRef (jvm_env, o_identifier);
2021 status = cjni_thread_detach ();
2024 ERROR ("java plugin: cjni_flush: cjni_thread_detach failed.");
2029 } /* }}} int cjni_flush */
2031 /* Call the CB_TYPE_LOG callback pointed to by the `user_data_t' pointer. */
2032 static void cjni_log (int severity, const char *message, /* {{{ */
2036 cjni_callback_info_t *cbi;
2042 if ((ud == NULL) || (ud->data == NULL))
2045 jvm_env = cjni_thread_attach ();
2046 if (jvm_env == NULL)
2049 cbi = (cjni_callback_info_t *) ud->data;
2051 o_message = (*jvm_env)->NewStringUTF (jvm_env, message);
2052 if (o_message == NULL)
2055 (*jvm_env)->CallVoidMethod (jvm_env,
2056 cbi->object, cbi->method, (jint) severity, o_message);
2058 (*jvm_env)->DeleteLocalRef (jvm_env, o_message);
2060 cjni_thread_detach ();
2061 } /* }}} int cjni_log */
2063 /* Iterate over `java_classes_list' and create one object of each class. This
2064 * will trigger the object's constructors, to the objects can register callback
2066 static int cjni_load_plugins (JNIEnv *jvm_env) /* {{{ */
2070 for (i = 0; i < java_classes_list_len; i++)
2072 java_plugin_class_t *class;
2073 jmethodID constructor_id;
2075 class = java_classes_list + i;
2077 DEBUG ("java plugin: Loading class %s", class->name);
2079 class->class = (*jvm_env)->FindClass (jvm_env, class->name);
2080 if (class->class == NULL)
2082 ERROR ("java plugin: cjni_load_plugins: FindClass (%s) failed.",
2087 constructor_id = (*jvm_env)->GetMethodID (jvm_env, class->class,
2089 if (constructor_id == NULL)
2091 ERROR ("java plugin: cjni_load_plugins: Could not find the constructor for `%s'.",
2096 class->object = (*jvm_env)->NewObject (jvm_env, class->class,
2098 if (class->object == NULL)
2100 ERROR ("java plugin: cjni_load_plugins: Could create a new `%s' object.",
2105 (*jvm_env)->NewGlobalRef (jvm_env, class->object);
2106 } /* for (i = 0; i < java_classes_list_len; i++) */
2109 } /* }}} int cjni_load_plugins */
2111 /* Iterate over `java_plugin_configs' and `java_callbacks' and call all
2112 * `config' callback methods for which a configuration is available. */
2113 static int cjni_config_plugins (JNIEnv *jvm_env) /* {{{ */
2119 for (i = 0; i < java_plugin_configs_num; i++)
2123 if (java_plugin_configs[i].ci == NULL)
2126 for (j = 0; j < java_callbacks_num; j++)
2128 if (java_callbacks[j].type != CB_TYPE_CONFIG)
2131 if (strcmp (java_plugin_configs[i].name, java_callbacks[j].name) == 0)
2135 if (j >= java_callbacks_num)
2137 NOTICE ("java plugin: Configuration for `%s' is present, but no such "
2138 "configuration callback has been registered.",
2139 java_plugin_configs[i].name);
2143 DEBUG ("java plugin: Configuring %s", java_plugin_configs[i].name);
2145 o_ocitem = ctoj_oconfig_item (jvm_env, java_plugin_configs[i].ci);
2146 if (o_ocitem == NULL)
2148 ERROR ("java plugin: cjni_config_plugins: ctoj_oconfig_item failed.");
2152 status = (*jvm_env)->CallIntMethod (jvm_env,
2153 java_callbacks[j].object, java_callbacks[j].method, o_ocitem);
2154 WARNING ("java plugin: Config callback for `%s' returned status %i.",
2155 java_plugin_configs[i].name, status);
2156 } /* for (i = 0; i < java_plugin_configs; i++) */
2159 } /* }}} int cjni_config_plugins */
2161 /* Iterate over `java_callbacks' and call all CB_TYPE_INIT callbacks. */
2162 static int cjni_init_plugins (JNIEnv *jvm_env) /* {{{ */
2167 for (i = 0; i < java_callbacks_num; i++)
2169 if (java_callbacks[i].type != CB_TYPE_INIT)
2172 DEBUG ("java plugin: Initializing %s", java_callbacks[i].name);
2174 status = (*jvm_env)->CallIntMethod (jvm_env,
2175 java_callbacks[i].object, java_callbacks[i].method);
2178 ERROR ("java plugin: Initializing `%s' failed with status %i. "
2179 "Removing read function.",
2180 java_callbacks[i].name, status);
2181 plugin_unregister_read (java_callbacks[i].name);
2186 } /* }}} int cjni_init_plugins */
2188 /* Iterate over `java_callbacks' and call all CB_TYPE_SHUTDOWN callbacks. */
2189 static int cjni_shutdown_plugins (JNIEnv *jvm_env) /* {{{ */
2194 for (i = 0; i < java_callbacks_num; i++)
2196 if (java_callbacks[i].type != CB_TYPE_SHUTDOWN)
2199 DEBUG ("java plugin: Shutting down %s", java_callbacks[i].name);
2201 status = (*jvm_env)->CallIntMethod (jvm_env,
2202 java_callbacks[i].object, java_callbacks[i].method);
2205 ERROR ("java plugin: Shutting down `%s' failed with status %i. ",
2206 java_callbacks[i].name, status);
2211 } /* }}} int cjni_shutdown_plugins */
2214 static int cjni_shutdown (void) /* {{{ */
2217 JavaVMAttachArgs args;
2225 memset (&args, 0, sizeof (args));
2226 args.version = JNI_VERSION_1_2;
2228 status = (*jvm)->AttachCurrentThread (jvm, (void **) &jvm_env, &args);
2231 ERROR ("java plugin: cjni_shutdown: AttachCurrentThread failed with status %i.",
2236 /* Execute all the shutdown functions registered by plugins. */
2237 cjni_shutdown_plugins (jvm_env);
2239 /* Release all the global references to callback functions */
2240 for (i = 0; i < java_callbacks_num; i++)
2242 if (java_callbacks[i].object != NULL)
2244 (*jvm_env)->DeleteGlobalRef (jvm_env, java_callbacks[i].object);
2245 java_callbacks[i].object = NULL;
2247 sfree (java_callbacks[i].name);
2249 java_callbacks_num = 0;
2250 sfree (java_callbacks);
2252 /* Release all the global references to directly loaded classes. */
2253 for (i = 0; i < java_classes_list_len; i++)
2255 if (java_classes_list[i].object != NULL)
2257 (*jvm_env)->DeleteGlobalRef (jvm_env, java_classes_list[i].object);
2258 java_classes_list[i].object = NULL;
2260 sfree (java_classes_list[i].name);
2262 java_classes_list_len = 0;
2263 sfree (java_classes_list);
2265 /* Destroy the JVM */
2266 (*jvm)->DestroyJavaVM (jvm);
2270 pthread_key_delete (jvm_env_key);
2272 /* Free the JVM argument list */
2273 for (i = 0; i < jvm_argc; i++)
2274 sfree (jvm_argv[i]);
2278 /* Free the copied configuration */
2279 for (i = 0; i < java_plugin_configs_num; i++)
2281 sfree (java_plugin_configs[i].name);
2282 oconfig_free (java_plugin_configs[i].ci);
2284 java_plugin_configs_num = 0;
2285 sfree (java_plugin_configs);
2288 } /* }}} int cjni_shutdown */
2290 /* Register ``native'' functions with the JVM. Native functions are C-functions
2291 * that can be called by Java code. */
2292 static int cjni_init_native (JNIEnv *jvm_env) /* {{{ */
2294 jclass api_class_ptr;
2297 api_class_ptr = (*jvm_env)->FindClass (jvm_env, "org.collectd.api.Collectd");
2298 if (api_class_ptr == NULL)
2300 ERROR ("cjni_init_native: Cannot find API class `org.collectd.api.Collectd'.");
2304 status = (*jvm_env)->RegisterNatives (jvm_env, api_class_ptr,
2305 jni_api_functions, (jint) jni_api_functions_num);
2308 ERROR ("cjni_init_native: RegisterNatives failed with status %i.", status);
2313 } /* }}} int cjni_init_native */
2315 /* Initialization: Create a JVM, load all configured classes and call their
2316 * `config' and `init' callback methods. */
2317 static int cjni_init (void) /* {{{ */
2320 JavaVMInitArgs vm_args;
2321 JavaVMOption vm_options[jvm_argc];
2329 status = pthread_key_create (&jvm_env_key, cjni_jvm_env_destroy);
2332 ERROR ("java plugin: cjni_init: pthread_key_create failed "
2333 "with status %i.", status);
2339 memset (&vm_args, 0, sizeof (vm_args));
2340 vm_args.version = JNI_VERSION_1_2;
2341 vm_args.options = vm_options;
2342 vm_args.nOptions = (jint) jvm_argc;
2344 for (i = 0; i < jvm_argc; i++)
2346 DEBUG ("java plugin: cjni_init: jvm_argv[%zu] = %s", i, jvm_argv[i]);
2347 vm_args.options[i].optionString = jvm_argv[i];
2350 vm_args.options[0].optionString = "-verbose:jni";
2351 vm_args.options[1].optionString = "-Djava.class.path=/home/octo/collectd/bindings/java";
2354 status = JNI_CreateJavaVM (&jvm, (void **) &jvm_env, (void **) &vm_args);
2357 ERROR ("cjni_init: JNI_CreateJavaVM failed with status %i.",
2361 assert (jvm != NULL);
2362 assert (jvm_env != NULL);
2364 /* Call RegisterNatives */
2365 status = cjni_init_native (jvm_env);
2368 ERROR ("cjni_init: cjni_init_native failed.");
2372 cjni_load_plugins (jvm_env);
2373 cjni_config_plugins (jvm_env);
2374 cjni_init_plugins (jvm_env);
2377 } /* }}} int cjni_init */
2379 void module_register (void)
2381 plugin_register_complex_config ("java", cjni_config);
2382 plugin_register_init ("java", cjni_init);
2383 plugin_register_shutdown ("java", cjni_shutdown);
2384 } /* void module_register (void) */
2386 /* vim: set sw=2 sts=2 et fdm=marker : */