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
69 struct cjni_callback_info_s /* {{{ */
77 typedef struct cjni_callback_info_s cjni_callback_info_t;
83 static JavaVM *jvm = NULL;
84 static pthread_key_t jvm_env_key;
86 /* Configuration options for the JVM. */
87 static char **jvm_argv = NULL;
88 static size_t jvm_argc = 0;
90 /* List of class names to load */
91 static java_plugin_class_t *java_classes_list = NULL;
92 static size_t java_classes_list_len;
94 /* List of `config_item_t's for Java plugins */
95 static java_plugin_config_t *java_plugin_configs = NULL;
96 static size_t java_plugin_configs_num = 0;
98 /* List of config, init, and shutdown callbacks. */
99 static cjni_callback_info_t *java_callbacks = NULL;
100 static size_t java_callbacks_num = 0;
101 static pthread_mutex_t java_callbacks_lock = PTHREAD_MUTEX_INITIALIZER;
106 * Mostly functions that are needed by the Java interface (``native'')
109 static void cjni_callback_info_destroy (void *arg);
110 static cjni_callback_info_t *cjni_callback_info_create (JNIEnv *jvm_env,
111 jobject o_name, jobject o_callback, int type);
112 static int cjni_callback_register (JNIEnv *jvm_env, jobject o_name,
113 jobject o_callback, int type);
114 static int cjni_read (user_data_t *user_data);
115 static int cjni_write (const data_set_t *ds, const value_list_t *vl,
117 static int cjni_flush (int timeout, const char *identifier, user_data_t *ud);
120 * C to Java conversion functions
122 static int ctoj_string (JNIEnv *jvm_env, /* {{{ */
124 jclass class_ptr, jobject object_ptr, const char *method_name)
129 /* Create a java.lang.String */
130 o_string = (*jvm_env)->NewStringUTF (jvm_env,
131 (string != NULL) ? string : "");
132 if (o_string == NULL)
134 ERROR ("java plugin: ctoj_string: NewStringUTF failed.");
138 /* Search for the `void setFoo (String s)' method. */
139 m_set = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
140 method_name, "(Ljava/lang/String;)V");
143 ERROR ("java plugin: ctoj_string: Cannot find method `void %s (String)'.",
145 (*jvm_env)->DeleteLocalRef (jvm_env, o_string);
149 /* Call the method. */
150 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_set, o_string);
152 /* Decrease reference counter on the java.lang.String object. */
153 (*jvm_env)->DeleteLocalRef (jvm_env, o_string);
156 } /* }}} int ctoj_string */
158 static int ctoj_int (JNIEnv *jvm_env, /* {{{ */
160 jclass class_ptr, jobject object_ptr, const char *method_name)
164 /* Search for the `void setFoo (int i)' method. */
165 m_set = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
166 method_name, "(I)V");
169 ERROR ("java plugin: ctoj_int: Cannot find method `void %s (int)'.",
174 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_set, value);
177 } /* }}} int ctoj_int */
179 static int ctoj_long (JNIEnv *jvm_env, /* {{{ */
181 jclass class_ptr, jobject object_ptr, const char *method_name)
185 /* Search for the `void setFoo (long l)' method. */
186 m_set = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
187 method_name, "(J)V");
190 ERROR ("java plugin: ctoj_long: Cannot find method `void %s (long)'.",
195 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_set, value);
198 } /* }}} int ctoj_long */
200 static int ctoj_double (JNIEnv *jvm_env, /* {{{ */
202 jclass class_ptr, jobject object_ptr, const char *method_name)
206 /* Search for the `void setFoo (double d)' method. */
207 m_set = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
208 method_name, "(D)V");
211 ERROR ("java plugin: ctoj_double: Cannot find method `void %s (double)'.",
216 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_set, value);
219 } /* }}} int ctoj_double */
221 /* Convert a jlong to a java.lang.Number */
222 static jobject ctoj_jlong_to_number (JNIEnv *jvm_env, jlong value) /* {{{ */
225 jmethodID m_long_constructor;
227 /* Look up the java.lang.Long class */
228 c_long = (*jvm_env)->FindClass (jvm_env, "java.lang.Long");
231 ERROR ("java plugin: ctoj_jlong_to_number: Looking up the "
232 "java.lang.Long class failed.");
236 m_long_constructor = (*jvm_env)->GetMethodID (jvm_env,
237 c_long, "<init>", "(J)V");
238 if (m_long_constructor == NULL)
240 ERROR ("java plugin: ctoj_jlong_to_number: Looking up the "
241 "`Long (long)' constructor failed.");
245 return ((*jvm_env)->NewObject (jvm_env,
246 c_long, m_long_constructor, value));
247 } /* }}} jobject ctoj_jlong_to_number */
249 /* Convert a jdouble to a java.lang.Number */
250 static jobject ctoj_jdouble_to_number (JNIEnv *jvm_env, jdouble value) /* {{{ */
253 jmethodID m_double_constructor;
255 /* Look up the java.lang.Long class */
256 c_double = (*jvm_env)->FindClass (jvm_env, "java.lang.Double");
257 if (c_double == NULL)
259 ERROR ("java plugin: ctoj_jdouble_to_number: Looking up the "
260 "java.lang.Double class failed.");
264 m_double_constructor = (*jvm_env)->GetMethodID (jvm_env,
265 c_double, "<init>", "(D)V");
266 if (m_double_constructor == NULL)
268 ERROR ("java plugin: ctoj_jdouble_to_number: Looking up the "
269 "`Double (double)' constructor failed.");
273 return ((*jvm_env)->NewObject (jvm_env,
274 c_double, m_double_constructor, value));
275 } /* }}} jobject ctoj_jdouble_to_number */
277 /* Convert a value_t to a java.lang.Number */
278 static jobject ctoj_value_to_number (JNIEnv *jvm_env, /* {{{ */
279 value_t value, int ds_type)
281 if (ds_type == DS_TYPE_COUNTER)
282 return (ctoj_jlong_to_number (jvm_env, (jlong) value.counter));
283 else if (ds_type == DS_TYPE_GAUGE)
284 return (ctoj_jdouble_to_number (jvm_env, (jdouble) value.gauge));
287 } /* }}} jobject ctoj_value_to_number */
289 /* Convert a data_source_t to a org.collectd.api.DataSource */
290 static jobject ctoj_data_source (JNIEnv *jvm_env, /* {{{ */
291 const data_source_t *dsrc)
294 jmethodID m_datasource_constructor;
295 jobject o_datasource;
298 /* Look up the DataSource class */
299 c_datasource = (*jvm_env)->FindClass (jvm_env,
300 "org.collectd.api.DataSource");
301 if (c_datasource == NULL)
303 ERROR ("java plugin: ctoj_data_source: "
304 "FindClass (org.collectd.api.DataSource) failed.");
308 /* Lookup the `ValueList ()' constructor. */
309 m_datasource_constructor = (*jvm_env)->GetMethodID (jvm_env, c_datasource,
311 if (m_datasource_constructor == NULL)
313 ERROR ("java plugin: ctoj_data_source: Cannot find the "
314 "`DataSource ()' constructor.");
318 /* Create a new instance. */
319 o_datasource = (*jvm_env)->NewObject (jvm_env, c_datasource,
320 m_datasource_constructor);
321 if (o_datasource == NULL)
323 ERROR ("java plugin: ctoj_data_source: "
324 "Creating a new DataSource instance failed.");
328 /* Set name via `void setName (String name)' */
329 status = ctoj_string (jvm_env, dsrc->name,
330 c_datasource, o_datasource, "setName");
333 ERROR ("java plugin: ctoj_data_source: "
334 "ctoj_string (setName) failed.");
335 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
339 /* Set type via `void setType (int type)' */
340 status = ctoj_int (jvm_env, dsrc->type,
341 c_datasource, o_datasource, "setType");
344 ERROR ("java plugin: ctoj_data_source: "
345 "ctoj_int (setType) failed.");
346 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
350 /* Set min via `void setMin (double min)' */
351 status = ctoj_double (jvm_env, dsrc->min,
352 c_datasource, o_datasource, "setMin");
355 ERROR ("java plugin: ctoj_data_source: "
356 "ctoj_double (setMin) failed.");
357 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
361 /* Set max via `void setMax (double max)' */
362 status = ctoj_double (jvm_env, dsrc->max,
363 c_datasource, o_datasource, "setMax");
366 ERROR ("java plugin: ctoj_data_source: "
367 "ctoj_double (setMax) failed.");
368 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
372 return (o_datasource);
373 } /* }}} jobject ctoj_data_source */
375 /* Convert a oconfig_value_t to a org.collectd.api.OConfigValue */
376 static jobject ctoj_oconfig_value (JNIEnv *jvm_env, /* {{{ */
377 oconfig_value_t ocvalue)
380 jmethodID m_ocvalue_constructor;
384 m_ocvalue_constructor = NULL;
387 c_ocvalue = (*jvm_env)->FindClass (jvm_env,
388 "org.collectd.api.OConfigValue");
389 if (c_ocvalue == NULL)
391 ERROR ("java plugin: ctoj_oconfig_value: "
392 "FindClass (org.collectd.api.OConfigValue) failed.");
396 if (ocvalue.type == OCONFIG_TYPE_BOOLEAN)
398 jboolean tmp_boolean;
400 tmp_boolean = (ocvalue.value.boolean == 0) ? JNI_FALSE : JNI_TRUE;
402 m_ocvalue_constructor = (*jvm_env)->GetMethodID (jvm_env, c_ocvalue,
404 if (m_ocvalue_constructor == NULL)
406 ERROR ("java plugin: ctoj_oconfig_value: Cannot find the "
407 "`OConfigValue (boolean)' constructor.");
411 return ((*jvm_env)->NewObject (jvm_env,
412 c_ocvalue, m_ocvalue_constructor, tmp_boolean));
413 } /* if (ocvalue.type == OCONFIG_TYPE_BOOLEAN) */
414 else if (ocvalue.type == OCONFIG_TYPE_STRING)
416 m_ocvalue_constructor = (*jvm_env)->GetMethodID (jvm_env, c_ocvalue,
417 "<init>", "(Ljava/lang/String;)V");
418 if (m_ocvalue_constructor == NULL)
420 ERROR ("java plugin: ctoj_oconfig_value: Cannot find the "
421 "`OConfigValue (String)' constructor.");
425 o_argument = (*jvm_env)->NewStringUTF (jvm_env, ocvalue.value.string);
426 if (o_argument == NULL)
428 ERROR ("java plugin: ctoj_oconfig_value: "
429 "Creating a String object failed.");
433 else if (ocvalue.type == OCONFIG_TYPE_NUMBER)
435 m_ocvalue_constructor = (*jvm_env)->GetMethodID (jvm_env, c_ocvalue,
436 "<init>", "(Ljava/lang/Number;)V");
437 if (m_ocvalue_constructor == NULL)
439 ERROR ("java plugin: ctoj_oconfig_value: Cannot find the "
440 "`OConfigValue (Number)' constructor.");
444 o_argument = ctoj_jdouble_to_number (jvm_env,
445 (jdouble) ocvalue.value.number);
446 if (o_argument == NULL)
448 ERROR ("java plugin: ctoj_oconfig_value: "
449 "Creating a Number object failed.");
458 assert (m_ocvalue_constructor != NULL);
459 assert (o_argument != NULL);
461 o_ocvalue = (*jvm_env)->NewObject (jvm_env,
462 c_ocvalue, m_ocvalue_constructor, o_argument);
463 if (o_ocvalue == NULL)
465 ERROR ("java plugin: ctoj_oconfig_value: "
466 "Creating an OConfigValue object failed.");
467 (*jvm_env)->DeleteLocalRef (jvm_env, o_argument);
471 (*jvm_env)->DeleteLocalRef (jvm_env, o_argument);
473 } /* }}} jobject ctoj_oconfig_value */
475 /* Convert a oconfig_item_t to a org.collectd.api.OConfigItem */
476 static jobject ctoj_oconfig_item (JNIEnv *jvm_env, /* {{{ */
477 const oconfig_item_t *ci)
480 jmethodID m_ocitem_constructor;
481 jmethodID m_addvalue;
482 jmethodID m_addchild;
487 c_ocitem = (*jvm_env)->FindClass (jvm_env, "org.collectd.api.OConfigItem");
488 if (c_ocitem == NULL)
490 ERROR ("java plugin: ctoj_oconfig_item: "
491 "FindClass (org.collectd.api.OConfigItem) failed.");
495 /* Get the required methods: m_ocitem_constructor, m_addvalue, and m_addchild
497 m_ocitem_constructor = (*jvm_env)->GetMethodID (jvm_env, c_ocitem,
498 "<init>", "(Ljava/lang/String;)V");
499 if (m_ocitem_constructor == NULL)
501 ERROR ("java plugin: ctoj_oconfig_item: Cannot find the "
502 "`OConfigItem (String)' constructor.");
506 m_addvalue = (*jvm_env)->GetMethodID (jvm_env, c_ocitem,
507 "addValue", "(Lorg/collectd/api/OConfigValue;)V");
508 if (m_addvalue == NULL)
510 ERROR ("java plugin: ctoj_oconfig_item: Cannot find the "
511 "`addValue (OConfigValue)' method.");
515 m_addchild = (*jvm_env)->GetMethodID (jvm_env, c_ocitem,
516 "addChild", "(Lorg/collectd/api/OConfigItem;)V");
517 if (m_addchild == NULL)
519 ERROR ("java plugin: ctoj_oconfig_item: Cannot find the "
520 "`addChild (OConfigItem)' method.");
525 /* Create a String object with the key.
526 * Needed for calling the constructor. */
527 o_key = (*jvm_env)->NewStringUTF (jvm_env, ci->key);
530 ERROR ("java plugin: ctoj_oconfig_item: "
531 "Creating String object failed.");
535 /* Create an OConfigItem object */
536 o_ocitem = (*jvm_env)->NewObject (jvm_env,
537 c_ocitem, m_ocitem_constructor, o_key);
538 if (o_ocitem == NULL)
540 ERROR ("java plugin: ctoj_oconfig_item: "
541 "Creating an OConfigItem object failed.");
542 (*jvm_env)->DeleteLocalRef (jvm_env, o_key);
546 /* We don't need the String object any longer.. */
547 (*jvm_env)->DeleteLocalRef (jvm_env, o_key);
549 /* Call OConfigItem.addValue for each value */
550 for (i = 0; i < ci->values_num; i++) /* {{{ */
554 o_value = ctoj_oconfig_value (jvm_env, ci->values[i]);
557 ERROR ("java plugin: ctoj_oconfig_item: "
558 "Creating an OConfigValue object failed.");
559 (*jvm_env)->DeleteLocalRef (jvm_env, o_ocitem);
563 (*jvm_env)->CallVoidMethod (jvm_env, o_ocitem, m_addvalue, o_value);
564 (*jvm_env)->DeleteLocalRef (jvm_env, o_value);
565 } /* }}} for (i = 0; i < ci->values_num; i++) */
567 /* Call OConfigItem.addChild for each child */
568 for (i = 0; i < ci->children_num; i++) /* {{{ */
572 o_child = ctoj_oconfig_item (jvm_env, ci->children + i);
575 ERROR ("java plugin: ctoj_oconfig_item: "
576 "Creating an OConfigItem object failed.");
577 (*jvm_env)->DeleteLocalRef (jvm_env, o_ocitem);
581 (*jvm_env)->CallVoidMethod (jvm_env, o_ocitem, m_addvalue, o_child);
582 (*jvm_env)->DeleteLocalRef (jvm_env, o_child);
583 } /* }}} for (i = 0; i < ci->children_num; i++) */
586 } /* }}} jobject ctoj_oconfig_item */
588 /* Convert a data_set_t to a org.collectd.api.DataSet */
589 static jobject ctoj_data_set (JNIEnv *jvm_env, const data_set_t *ds) /* {{{ */
592 jmethodID m_constructor;
598 /* Look up the org.collectd.api.DataSet class */
599 c_dataset = (*jvm_env)->FindClass (jvm_env, "org.collectd.api.DataSet");
600 if (c_dataset == NULL)
602 ERROR ("java plugin: ctoj_data_set: Looking up the "
603 "org.collectd.api.DataSet class failed.");
607 /* Search for the `DataSet (String type)' constructor. */
608 m_constructor = (*jvm_env)->GetMethodID (jvm_env,
609 c_dataset, "<init>", "(Ljava.lang.String;)V");
610 if (m_constructor == NULL)
612 ERROR ("java plugin: ctoj_data_set: Looking up the "
613 "`DataSet (String)' constructor failed.");
617 /* Search for the `void addDataSource (DataSource)' method. */
618 m_add = (*jvm_env)->GetMethodID (jvm_env,
619 c_dataset, "addDataSource", "(Lorg.collectd.api.DataSource;)V");
622 ERROR ("java plugin: ctoj_data_set: Looking up the "
623 "`addDataSource (DataSource)' method failed.");
627 o_type = (*jvm_env)->NewStringUTF (jvm_env, ds->type);
630 ERROR ("java plugin: ctoj_data_set: Creating a String object failed.");
634 o_dataset = (*jvm_env)->NewObject (jvm_env,
635 c_dataset, m_constructor, o_type);
636 if (o_dataset == NULL)
638 ERROR ("java plugin: ctoj_data_set: Creating a DataSet object failed.");
639 (*jvm_env)->DeleteLocalRef (jvm_env, o_type);
643 /* Decrease reference counter on the java.lang.String object. */
644 (*jvm_env)->DeleteLocalRef (jvm_env, o_type);
646 for (i = 0; i < ds->ds_num; i++)
648 jobject o_datasource;
650 o_datasource = ctoj_data_source (jvm_env, ds->ds + i);
651 if (o_datasource == NULL)
653 ERROR ("java plugin: ctoj_data_set: ctoj_data_source (%s.%s) failed",
654 ds->type, ds->ds[i].name);
655 (*jvm_env)->DeleteLocalRef (jvm_env, o_dataset);
659 (*jvm_env)->CallVoidMethod (jvm_env, o_dataset, m_add, o_datasource);
661 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
662 } /* for (i = 0; i < ds->ds_num; i++) */
665 } /* }}} jobject ctoj_data_set */
667 static int ctoj_value_list_add_value (JNIEnv *jvm_env, /* {{{ */
668 value_t value, int ds_type,
669 jclass class_ptr, jobject object_ptr)
671 jmethodID m_addvalue;
674 m_addvalue = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
675 "addValue", "(Ljava/lang/Number;)V");
676 if (m_addvalue == NULL)
678 ERROR ("java plugin: ctoj_value_list_add_value: "
679 "Cannot find method `void addValue (Number)'.");
683 o_number = ctoj_value_to_number (jvm_env, value, ds_type);
684 if (o_number == NULL)
686 ERROR ("java plugin: ctoj_value_list_add_value: "
687 "ctoj_value_to_number failed.");
691 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_addvalue, o_number);
693 (*jvm_env)->DeleteLocalRef (jvm_env, o_number);
696 } /* }}} int ctoj_value_list_add_value */
698 static int ctoj_value_list_add_data_set (JNIEnv *jvm_env, /* {{{ */
699 jclass c_valuelist, jobject o_valuelist, const data_set_t *ds)
701 jmethodID m_setdataset;
704 /* Look for the `void setDataSource (List<DataSource> ds)' method. */
705 m_setdataset = (*jvm_env)->GetMethodID (jvm_env, c_valuelist,
706 "setDataSet", "(Lorg.collectd.api.DataSet;)V");
707 if (m_setdataset == NULL)
709 ERROR ("java plugin: ctoj_value_list_add_data_set: "
710 "Cannot find the `void setDataSet (DataSet)' method.");
714 /* Create a DataSet object. */
715 o_dataset = ctoj_data_set (jvm_env, ds);
716 if (o_dataset == NULL)
718 ERROR ("java plugin: ctoj_value_list_add_data_set: "
719 "ctoj_data_set (%s) failed.", ds->type);
723 /* Actually call the method. */
724 (*jvm_env)->CallVoidMethod (jvm_env,
725 o_valuelist, m_setdataset, o_dataset);
727 /* Decrease reference counter on the List<DataSource> object. */
728 (*jvm_env)->DeleteLocalRef (jvm_env, o_dataset);
731 } /* }}} int ctoj_value_list_add_data_set */
733 /* Convert a value_list_t (and data_set_t) to a org.collectd.api.ValueList */
734 static jobject ctoj_value_list (JNIEnv *jvm_env, /* {{{ */
735 const data_set_t *ds, const value_list_t *vl)
738 jmethodID m_valuelist_constructor;
743 /* First, create a new ValueList instance..
744 * Look up the class.. */
745 c_valuelist = (*jvm_env)->FindClass (jvm_env,
746 "org.collectd.api.ValueList");
747 if (c_valuelist == NULL)
749 ERROR ("java plugin: ctoj_value_list: "
750 "FindClass (org.collectd.api.ValueList) failed.");
754 /* Lookup the `ValueList ()' constructor. */
755 m_valuelist_constructor = (*jvm_env)->GetMethodID (jvm_env, c_valuelist,
757 if (m_valuelist_constructor == NULL)
759 ERROR ("java plugin: ctoj_value_list: Cannot find the "
760 "`ValueList ()' constructor.");
764 /* Create a new instance. */
765 o_valuelist = (*jvm_env)->NewObject (jvm_env, c_valuelist,
766 m_valuelist_constructor);
767 if (o_valuelist == NULL)
769 ERROR ("java plugin: ctoj_value_list: Creating a new ValueList instance "
774 status = ctoj_value_list_add_data_set (jvm_env,
775 c_valuelist, o_valuelist, ds);
778 ERROR ("java plugin: ctoj_value_list: "
779 "ctoj_value_list_add_data_set failed.");
780 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist);
784 /* Set the strings.. */
785 #define SET_STRING(str,method_name) do { \
786 status = ctoj_string (jvm_env, str, \
787 c_valuelist, o_valuelist, method_name); \
789 ERROR ("java plugin: ctoj_value_list: jtoc_string (%s) failed.", \
791 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist); \
795 SET_STRING (vl->host, "setHost");
796 SET_STRING (vl->plugin, "setPlugin");
797 SET_STRING (vl->plugin_instance, "setPluginInstance");
798 SET_STRING (vl->type, "setType");
799 SET_STRING (vl->type_instance, "setTypeInstance");
803 /* Set the `time' member. Java stores time in milliseconds. */
804 status = ctoj_long (jvm_env, ((jlong) vl->time) * ((jlong) 1000),
805 c_valuelist, o_valuelist, "setTime");
808 ERROR ("java plugin: ctoj_value_list: ctoj_long (setTime) failed.");
809 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist);
813 /* Set the `interval' member.. */
814 status = ctoj_long (jvm_env, (jlong) vl->interval,
815 c_valuelist, o_valuelist, "setInterval");
818 ERROR ("java plugin: ctoj_value_list: ctoj_long (setInterval) failed.");
819 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist);
823 for (i = 0; i < vl->values_len; i++)
825 status = ctoj_value_list_add_value (jvm_env, vl->values[i], ds->ds[i].type,
826 c_valuelist, o_valuelist);
829 ERROR ("java plugin: ctoj_value_list: "
830 "ctoj_value_list_add_value failed.");
831 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist);
836 return (o_valuelist);
837 } /* }}} int ctoj_value_list */
840 * Java to C conversion functions
842 /* Call a `String <method> ()' method. */
843 static int jtoc_string (JNIEnv *jvm_env, /* {{{ */
844 char *buffer, size_t buffer_size,
845 jclass class_ptr, jobject object_ptr, const char *method_name)
851 method_id = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
852 method_name, "()Ljava/lang/String;");
853 if (method_id == NULL)
855 ERROR ("java plugin: jtoc_string: Cannot find method `String %s ()'.",
860 string_obj = (*jvm_env)->CallObjectMethod (jvm_env, object_ptr, method_id);
861 if (string_obj == NULL)
863 ERROR ("java plugin: jtoc_string: CallObjectMethod (%s) failed.",
868 c_str = (*jvm_env)->GetStringUTFChars (jvm_env, string_obj, 0);
871 ERROR ("java plugin: jtoc_string: GetStringUTFChars failed.");
872 (*jvm_env)->DeleteLocalRef (jvm_env, string_obj);
876 sstrncpy (buffer, c_str, buffer_size);
878 (*jvm_env)->ReleaseStringUTFChars (jvm_env, string_obj, c_str);
879 (*jvm_env)->DeleteLocalRef (jvm_env, string_obj);
882 } /* }}} int jtoc_string */
884 /* Call a `long <method> ()' method. */
885 static int jtoc_long (JNIEnv *jvm_env, /* {{{ */
887 jclass class_ptr, jobject object_ptr, const char *method_name)
891 method_id = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
893 if (method_id == NULL)
895 ERROR ("java plugin: jtoc_long: Cannot find method `long %s ()'.",
900 *ret_value = (*jvm_env)->CallLongMethod (jvm_env, object_ptr, method_id);
903 } /* }}} int jtoc_long */
905 /* Call a `double <method> ()' method. */
906 static int jtoc_double (JNIEnv *jvm_env, /* {{{ */
908 jclass class_ptr, jobject object_ptr, const char *method_name)
912 method_id = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
914 if (method_id == NULL)
916 ERROR ("java plugin: jtoc_string: Cannot find method `double %s ()'.",
921 *ret_value = (*jvm_env)->CallDoubleMethod (jvm_env, object_ptr, method_id);
924 } /* }}} int jtoc_double */
926 static int jtoc_value (JNIEnv *jvm_env, /* {{{ */
927 value_t *ret_value, int ds_type, jobject object_ptr)
932 class_ptr = (*jvm_env)->GetObjectClass (jvm_env, object_ptr);
934 if (ds_type == DS_TYPE_COUNTER)
938 status = jtoc_long (jvm_env, &tmp_long,
939 class_ptr, object_ptr, "longValue");
942 ERROR ("java plugin: jtoc_value: "
943 "jtoc_long failed.");
946 (*ret_value).counter = (counter_t) tmp_long;
952 status = jtoc_double (jvm_env, &tmp_double,
953 class_ptr, object_ptr, "doubleValue");
956 ERROR ("java plugin: jtoc_value: "
957 "jtoc_double failed.");
960 (*ret_value).gauge = (gauge_t) tmp_double;
964 } /* }}} int jtoc_value */
966 /* Read a List<Number>, convert it to `value_t' and add it to the given
968 static int jtoc_values_array (JNIEnv *jvm_env, /* {{{ */
969 const data_set_t *ds, value_list_t *vl,
970 jclass class_ptr, jobject object_ptr)
972 jmethodID m_getvalues;
975 jobjectArray o_number_array;
981 values_num = ds->ds_num;
984 o_number_array = NULL;
987 #define BAIL_OUT(status) \
989 if (o_number_array != NULL) \
990 (*jvm_env)->DeleteLocalRef (jvm_env, o_number_array); \
991 if (o_list != NULL) \
992 (*jvm_env)->DeleteLocalRef (jvm_env, o_list); \
995 /* Call: List<Number> ValueList.getValues () */
996 m_getvalues = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
997 "getValues", "()Ljava/util/List;");
998 if (m_getvalues == NULL)
1000 ERROR ("java plugin: jtoc_values_array: "
1001 "Cannot find method `List getValues ()'.");
1005 o_list = (*jvm_env)->CallObjectMethod (jvm_env, object_ptr, m_getvalues);
1008 ERROR ("java plugin: jtoc_values_array: "
1009 "CallObjectMethod (getValues) failed.");
1013 /* Call: Number[] List.toArray () */
1014 m_toarray = (*jvm_env)->GetMethodID (jvm_env,
1015 (*jvm_env)->GetObjectClass (jvm_env, o_list),
1016 "toArray", "()[Ljava/lang/Object;");
1017 if (m_toarray == NULL)
1019 ERROR ("java plugin: jtoc_values_array: "
1020 "Cannot find method `Object[] toArray ()'.");
1024 o_number_array = (*jvm_env)->CallObjectMethod (jvm_env, o_list, m_toarray);
1025 if (o_number_array == NULL)
1027 ERROR ("java plugin: jtoc_values_array: "
1028 "CallObjectMethod (toArray) failed.");
1032 values = (value_t *) calloc (values_num, sizeof (value_t));
1035 ERROR ("java plugin: jtoc_values_array: calloc failed.");
1039 for (i = 0; i < values_num; i++)
1044 o_number = (*jvm_env)->GetObjectArrayElement (jvm_env,
1045 o_number_array, (jsize) i);
1046 if (o_number == NULL)
1048 ERROR ("java plugin: jtoc_values_array: "
1049 "GetObjectArrayElement (%i) failed.", i);
1053 status = jtoc_value (jvm_env, values + i, ds->ds[i].type, o_number);
1056 ERROR ("java plugin: jtoc_values_array: "
1057 "jtoc_value (%i) failed.", i);
1060 } /* for (i = 0; i < values_num; i++) */
1062 vl->values = values;
1063 vl->values_len = values_num;
1066 (*jvm_env)->DeleteLocalRef (jvm_env, o_number_array);
1067 (*jvm_env)->DeleteLocalRef (jvm_env, o_list);
1069 } /* }}} int jtoc_values_array */
1071 /* Convert a org.collectd.api.ValueList to a value_list_t. */
1072 static int jtoc_value_list (JNIEnv *jvm_env, value_list_t *vl, /* {{{ */
1078 const data_set_t *ds;
1080 class_ptr = (*jvm_env)->GetObjectClass (jvm_env, object_ptr);
1081 if (class_ptr == NULL)
1083 ERROR ("java plugin: jtoc_value_list: GetObjectClass failed.");
1087 #define SET_STRING(buffer,method) do { \
1088 status = jtoc_string (jvm_env, buffer, sizeof (buffer), \
1089 class_ptr, object_ptr, method); \
1090 if (status != 0) { \
1091 ERROR ("java plugin: jtoc_value_list: jtoc_string (%s) failed.", \
1096 SET_STRING(vl->type, "getType");
1098 ds = plugin_get_ds (vl->type);
1101 ERROR ("java plugin: jtoc_value_list: Data-set `%s' is not defined. "
1102 "Please consult the types.db(5) manpage for mor information.",
1107 SET_STRING(vl->host, "getHost");
1108 SET_STRING(vl->plugin, "getPlugin");
1109 SET_STRING(vl->plugin_instance, "getPluginInstance");
1110 SET_STRING(vl->type_instance, "getTypeInstance");
1114 status = jtoc_long (jvm_env, &tmp_long, class_ptr, object_ptr, "getTime");
1117 ERROR ("java plugin: jtoc_value_list: jtoc_long (getTime) failed.");
1120 /* Java measures time in milliseconds. */
1121 vl->time = (time_t) (tmp_long / ((jlong) 1000));
1123 status = jtoc_long (jvm_env, &tmp_long,
1124 class_ptr, object_ptr, "getInterval");
1127 ERROR ("java plugin: jtoc_value_list: jtoc_long (getInterval) failed.");
1130 vl->interval = (int) tmp_long;
1132 status = jtoc_values_array (jvm_env, ds, vl, class_ptr, object_ptr);
1135 ERROR ("java plugin: jtoc_value_list: jtoc_values_array failed.");
1140 } /* }}} int jtoc_value_list */
1143 * Functions accessible from Java
1145 static jint JNICALL cjni_api_dispatch_values (JNIEnv *jvm_env, /* {{{ */
1146 jobject this, jobject java_vl)
1148 value_list_t vl = VALUE_LIST_INIT;
1151 DEBUG ("cjni_api_dispatch_values: java_vl = %p;", (void *) java_vl);
1153 status = jtoc_value_list (jvm_env, &vl, java_vl);
1156 ERROR ("java plugin: cjni_api_dispatch_values: jtoc_value_list failed.");
1160 status = plugin_dispatch_values (&vl);
1165 } /* }}} jint cjni_api_dispatch_values */
1167 static jobject JNICALL cjni_api_get_ds (JNIEnv *jvm_env, /* {{{ */
1168 jobject this, jobject o_string_type)
1170 const char *ds_name;
1171 const data_set_t *ds;
1174 ds_name = (*jvm_env)->GetStringUTFChars (jvm_env, o_string_type, 0);
1175 if (ds_name == NULL)
1177 ERROR ("java plugin: cjni_api_get_ds: GetStringUTFChars failed.");
1181 ds = plugin_get_ds (ds_name);
1182 DEBUG ("java plugin: cjni_api_get_ds: "
1183 "plugin_get_ds (%s) = %p;", ds_name, (void *) ds);
1185 (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_string_type, ds_name);
1190 o_dataset = ctoj_data_set (jvm_env, ds);
1192 } /* }}} jint cjni_api_get_ds */
1194 static jint JNICALL cjni_api_register_config (JNIEnv *jvm_env, /* {{{ */
1195 jobject this, jobject o_name, jobject o_config)
1197 return (cjni_callback_register (jvm_env, o_name, o_config, CB_TYPE_CONFIG));
1198 } /* }}} jint cjni_api_register_config */
1200 static jint JNICALL cjni_api_register_init (JNIEnv *jvm_env, /* {{{ */
1201 jobject this, jobject o_name, jobject o_config)
1203 return (cjni_callback_register (jvm_env, o_name, o_config, CB_TYPE_INIT));
1204 } /* }}} jint cjni_api_register_init */
1206 static jint JNICALL cjni_api_register_read (JNIEnv *jvm_env, /* {{{ */
1207 jobject this, jobject o_name, jobject o_read)
1210 cjni_callback_info_t *cbi;
1212 cbi = cjni_callback_info_create (jvm_env, o_name, o_read, CB_TYPE_READ);
1216 DEBUG ("java plugin: Registering new read callback: %s", cbi->name);
1218 memset (&ud, 0, sizeof (ud));
1219 ud.data = (void *) cbi;
1220 ud.free_func = cjni_callback_info_destroy;
1222 plugin_register_complex_read (cbi->name, cjni_read, &ud);
1224 (*jvm_env)->DeleteLocalRef (jvm_env, o_read);
1227 } /* }}} jint cjni_api_register_read */
1229 static jint JNICALL cjni_api_register_write (JNIEnv *jvm_env, /* {{{ */
1230 jobject this, jobject o_name, jobject o_write)
1233 cjni_callback_info_t *cbi;
1235 cbi = cjni_callback_info_create (jvm_env, o_name, o_write, CB_TYPE_WRITE);
1239 DEBUG ("java plugin: Registering new write callback: %s", cbi->name);
1241 memset (&ud, 0, sizeof (ud));
1242 ud.data = (void *) cbi;
1243 ud.free_func = cjni_callback_info_destroy;
1245 plugin_register_write (cbi->name, cjni_write, &ud);
1247 (*jvm_env)->DeleteLocalRef (jvm_env, o_write);
1250 } /* }}} jint cjni_api_register_write */
1252 static jint JNICALL cjni_api_register_flush (JNIEnv *jvm_env, /* {{{ */
1253 jobject this, jobject o_name, jobject o_flush)
1256 cjni_callback_info_t *cbi;
1258 cbi = cjni_callback_info_create (jvm_env, o_name, o_flush, CB_TYPE_FLUSH);
1262 DEBUG ("java plugin: Registering new flush callback: %s", cbi->name);
1264 memset (&ud, 0, sizeof (ud));
1265 ud.data = (void *) cbi;
1266 ud.free_func = cjni_callback_info_destroy;
1268 plugin_register_flush (cbi->name, cjni_flush, &ud);
1270 (*jvm_env)->DeleteLocalRef (jvm_env, o_flush);
1273 } /* }}} jint cjni_api_register_flush */
1275 static jint JNICALL cjni_api_register_shutdown (JNIEnv *jvm_env, /* {{{ */
1276 jobject this, jobject o_name, jobject o_shutdown)
1278 return (cjni_callback_register (jvm_env, o_name, o_shutdown,
1280 } /* }}} jint cjni_api_register_shutdown */
1282 static void JNICALL cjni_api_log (JNIEnv *jvm_env, /* {{{ */
1283 jobject this, jint severity, jobject o_message)
1287 c_str = (*jvm_env)->GetStringUTFChars (jvm_env, o_message, 0);
1290 ERROR ("java plugin: cjni_api_log: GetStringUTFChars failed.");
1294 if (severity < LOG_ERR)
1296 if (severity > LOG_DEBUG)
1297 severity = LOG_DEBUG;
1299 plugin_log (severity, "%s", c_str);
1301 (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_message, c_str);
1302 } /* }}} void cjni_api_log */
1304 /* List of ``native'' functions, i. e. C-functions that can be called from
1306 static JNINativeMethod jni_api_functions[] = /* {{{ */
1309 "(Lorg/collectd/api/ValueList;)I",
1310 cjni_api_dispatch_values },
1313 "(Ljava/lang/String;)Lorg/collectd/api/DataSet;",
1317 "(Ljava/lang/String;Lorg/collectd/api/CollectdConfigInterface;)I",
1318 cjni_api_register_config },
1321 "(Ljava/lang/String;Lorg/collectd/api/CollectdInitInterface;)I",
1322 cjni_api_register_init },
1325 "(Ljava/lang/String;Lorg/collectd/api/CollectdReadInterface;)I",
1326 cjni_api_register_read },
1329 "(Ljava/lang/String;Lorg/collectd/api/CollectdWriteInterface;)I",
1330 cjni_api_register_write },
1333 "(Ljava/lang/String;Lorg/collectd/api/CollectdFlushInterface;)I",
1334 cjni_api_register_flush },
1336 { "registerShutdown",
1337 "(Ljava/lang/String;Lorg/collectd/api/CollectdShutdownInterface;)I",
1338 cjni_api_register_shutdown },
1341 "(ILjava/lang/String;)V",
1344 static size_t jni_api_functions_num = sizeof (jni_api_functions)
1345 / sizeof (jni_api_functions[0]);
1351 /* Allocate a `cjni_callback_info_t' given the type and objects necessary for
1352 * all registration functions. */
1353 static cjni_callback_info_t *cjni_callback_info_create (JNIEnv *jvm_env, /* {{{ */
1354 jobject o_name, jobject o_callback, int type)
1357 cjni_callback_info_t *cbi;
1358 const char *method_name;
1359 const char *method_signature;
1363 case CB_TYPE_CONFIG:
1364 method_name = "config";
1365 method_signature = "(Lorg/collectd/api/OConfigItem;)I";
1369 method_name = "init";
1370 method_signature = "()I";
1374 method_name = "read";
1375 method_signature = "()I";
1379 method_name = "write";
1380 method_signature = "(Lorg/collectd/api/ValueList;)I";
1384 method_name = "flush";
1385 method_signature = "(ILjava/lang/String;)I";
1388 case CB_TYPE_SHUTDOWN:
1389 method_name = "shutdown";
1390 method_signature = "()I";
1394 ERROR ("java plugin: cjni_callback_info_create: Unknown type: %#x",
1399 c_name = (*jvm_env)->GetStringUTFChars (jvm_env, o_name, 0);
1402 ERROR ("java plugin: cjni_callback_info_create: "
1403 "GetStringUTFChars failed.");
1407 cbi = (cjni_callback_info_t *) malloc (sizeof (*cbi));
1410 ERROR ("java plugin: cjni_callback_info_create: malloc failed.");
1411 (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_name, c_name);
1414 memset (cbi, 0, sizeof (*cbi));
1417 cbi->name = strdup (c_name);
1418 if (cbi->name == NULL)
1420 pthread_mutex_unlock (&java_callbacks_lock);
1421 ERROR ("java plugin: cjni_callback_info_create: strdup failed.");
1422 (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_name, c_name);
1426 (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_name, c_name);
1428 cbi->class = (*jvm_env)->GetObjectClass (jvm_env, o_callback);
1429 if (cbi->class == NULL)
1431 ERROR ("java plugin: cjni_callback_info_create: GetObjectClass failed.");
1436 cbi->object = o_callback;
1438 cbi->method = (*jvm_env)->GetMethodID (jvm_env, cbi->class,
1439 method_name, method_signature);
1440 if (cbi->method == NULL)
1442 ERROR ("java plugin: cjni_callback_info_create: "
1443 "Cannot find the `%s' method with signature `%s'.",
1444 method_name, method_signature);
1449 (*jvm_env)->NewGlobalRef (jvm_env, o_callback);
1452 } /* }}} cjni_callback_info_t cjni_callback_info_create */
1454 /* Allocate a `cjni_callback_info_t' via `cjni_callback_info_create' and add it
1455 * to the global `java_callbacks' variable. This is used for `config', `init',
1456 * and `shutdown' callbacks. */
1457 static int cjni_callback_register (JNIEnv *jvm_env, /* {{{ */
1458 jobject o_name, jobject o_callback, int type)
1460 cjni_callback_info_t *cbi;
1461 cjni_callback_info_t *tmp;
1463 const char *type_str;
1466 cbi = cjni_callback_info_create (jvm_env, o_name, o_callback, type);
1473 case CB_TYPE_CONFIG:
1474 type_str = "config";
1481 case CB_TYPE_SHUTDOWN:
1482 type_str = "shutdown";
1486 type_str = "<unknown>";
1488 DEBUG ("java plugin: Registering new %s callback: %s",
1489 type_str, cbi->name);
1492 pthread_mutex_lock (&java_callbacks_lock);
1494 tmp = (cjni_callback_info_t *) realloc (java_callbacks,
1495 (java_callbacks_num + 1) * sizeof (*java_callbacks));
1498 pthread_mutex_unlock (&java_callbacks_lock);
1499 ERROR ("java plugin: cjni_callback_register: realloc failed.");
1501 (*jvm_env)->DeleteGlobalRef (jvm_env, cbi->object);
1506 java_callbacks = tmp;
1507 java_callbacks[java_callbacks_num] = *cbi;
1508 java_callbacks_num++;
1510 pthread_mutex_unlock (&java_callbacks_lock);
1514 } /* }}} int cjni_callback_register */
1516 /* Increase the reference counter to the JVM for this thread. If it was zero,
1517 * attach the JVM first. */
1518 static JNIEnv *cjni_thread_attach (void) /* {{{ */
1520 cjni_jvm_env_t *cjni_env;
1523 cjni_env = pthread_getspecific (jvm_env_key);
1524 if (cjni_env == NULL)
1526 /* This pointer is free'd in `cjni_jvm_env_destroy'. */
1527 cjni_env = (cjni_jvm_env_t *) malloc (sizeof (*cjni_env));
1528 if (cjni_env == NULL)
1530 ERROR ("java plugin: cjni_thread_attach: malloc failed.");
1533 memset (cjni_env, 0, sizeof (*cjni_env));
1534 cjni_env->reference_counter = 0;
1535 cjni_env->jvm_env = NULL;
1537 pthread_setspecific (jvm_env_key, cjni_env);
1540 if (cjni_env->reference_counter > 0)
1542 cjni_env->reference_counter++;
1543 jvm_env = cjni_env->jvm_env;
1548 JavaVMAttachArgs args;
1550 assert (cjni_env->jvm_env == NULL);
1552 memset (&args, 0, sizeof (args));
1553 args.version = JNI_VERSION_1_2;
1555 status = (*jvm)->AttachCurrentThread (jvm, (void *) &jvm_env, (void *) &args);
1558 ERROR ("java plugin: cjni_thread_attach: AttachCurrentThread failed "
1559 "with status %i.", status);
1563 cjni_env->reference_counter = 1;
1564 cjni_env->jvm_env = jvm_env;
1567 DEBUG ("java plugin: cjni_thread_attach: cjni_env->reference_counter = %i",
1568 cjni_env->reference_counter);
1569 assert (jvm_env != NULL);
1571 } /* }}} JNIEnv *cjni_thread_attach */
1573 /* Decrease the reference counter of this thread. If it reaches zero, detach
1575 static int cjni_thread_detach (void) /* {{{ */
1577 cjni_jvm_env_t *cjni_env;
1580 cjni_env = pthread_getspecific (jvm_env_key);
1581 if (cjni_env == NULL)
1583 ERROR ("java plugin: cjni_thread_detach: pthread_getspecific failed.");
1587 assert (cjni_env->reference_counter > 0);
1588 assert (cjni_env->jvm_env != NULL);
1590 cjni_env->reference_counter--;
1591 DEBUG ("java plugin: cjni_thread_detach: cjni_env->reference_counter = %i",
1592 cjni_env->reference_counter);
1594 if (cjni_env->reference_counter > 0)
1597 status = (*jvm)->DetachCurrentThread (jvm);
1600 ERROR ("java plugin: cjni_thread_detach: DetachCurrentThread failed "
1601 "with status %i.", status);
1604 cjni_env->reference_counter = 0;
1605 cjni_env->jvm_env = NULL;
1608 } /* }}} JNIEnv *cjni_thread_attach */
1610 /* Callback for `pthread_key_create'. It frees the data contained in
1611 * `jvm_env_key' and prints a warning if the reference counter is not zero. */
1612 static void cjni_jvm_env_destroy (void *args) /* {{{ */
1614 cjni_jvm_env_t *cjni_env;
1619 cjni_env = (cjni_jvm_env_t *) args;
1621 if (cjni_env->reference_counter > 0)
1623 ERROR ("java plugin: cjni_jvm_env_destroy: "
1624 "cjni_env->reference_counter = %i;", cjni_env->reference_counter);
1627 if (cjni_env->jvm_env != NULL)
1629 ERROR ("java plugin: cjni_jvm_env_destroy: cjni_env->jvm_env = %p;",
1630 (void *) cjni_env->jvm_env);
1633 /* The pointer is allocated in `cjni_thread_attach' */
1635 } /* }}} void cjni_jvm_env_destroy */
1637 /* Boring configuration functions.. {{{ */
1638 static int cjni_config_add_jvm_arg (oconfig_item_t *ci) /* {{{ */
1642 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
1644 WARNING ("java plugin: `JVMArg' needs exactly one string argument.");
1648 tmp = (char **) realloc (jvm_argv, sizeof (char *) * (jvm_argc + 1));
1651 ERROR ("java plugin: realloc failed.");
1656 jvm_argv[jvm_argc] = strdup (ci->values[0].value.string);
1657 if (jvm_argv[jvm_argc] == NULL)
1659 ERROR ("java plugin: strdup failed.");
1665 } /* }}} int cjni_config_add_jvm_arg */
1667 static int cjni_config_load_plugin (oconfig_item_t *ci) /* {{{ */
1669 java_plugin_class_t *tmp;
1671 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
1673 WARNING ("java plugin: `LoadPlugin' needs exactly one string argument.");
1677 tmp = (java_plugin_class_t *) realloc (java_classes_list,
1678 (java_classes_list_len + 1) * sizeof (*java_classes_list));
1681 ERROR ("java plugin: realloc failed.");
1684 java_classes_list = tmp;
1685 tmp = java_classes_list + java_classes_list_len;
1687 memset (tmp, 0, sizeof (*tmp));
1688 tmp->name = strdup (ci->values[0].value.string);
1689 if (tmp->name == NULL)
1691 ERROR ("java plugin: strdup failed.");
1697 java_classes_list_len++;
1700 } /* }}} int cjni_config_load_plugin */
1702 static int cjni_config_plugin_block (oconfig_item_t *ci) /* {{{ */
1704 java_plugin_config_t *tmp;
1708 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
1710 WARNING ("java plugin: `Plugin' blocks "
1711 "need exactly one string argument.");
1715 name = strdup (ci->values[0].value.string);
1718 ERROR ("java plugin: cjni_config_plugin_block: strdup faiiled.");
1722 for (i = 0; i < java_plugin_configs_num; i++)
1724 if (strcmp (java_plugin_configs[i].name, name) == 0)
1726 WARNING ("java plugin: There is more than one <Plugin \"%s\"> block. "
1727 "This is currently not supported - "
1728 "only the first block will be used!",
1735 tmp = (java_plugin_config_t *) realloc (java_plugin_configs,
1736 (java_plugin_configs_num + 1) * sizeof (*java_plugin_configs));
1739 ERROR ("java plugin: cjni_config_plugin_block: realloc failed.");
1743 java_plugin_configs = tmp;
1744 tmp = java_plugin_configs + java_plugin_configs_num;
1747 tmp->ci = oconfig_clone (ci);
1748 if (tmp->ci == NULL)
1750 ERROR ("java plugin: cjni_config_plugin_block: "
1751 "oconfig_clone failed for `%s'.",
1757 DEBUG ("java plugin: cjni_config_plugin_block: "
1758 "Successfully copied config for `%s'.",
1761 java_plugin_configs_num++;
1763 } /* }}} int cjni_config_plugin_block */
1765 static int cjni_config (oconfig_item_t *ci) /* {{{ */
1775 for (i = 0; i < ci->children_num; i++)
1777 oconfig_item_t *child = ci->children + i;
1779 if (strcasecmp ("JVMArg", child->key) == 0)
1781 status = cjni_config_add_jvm_arg (child);
1787 else if (strcasecmp ("LoadPlugin", child->key) == 0)
1789 status = cjni_config_load_plugin (child);
1795 else if (strcasecmp ("Plugin", child->key) == 0)
1797 status = cjni_config_plugin_block (child);
1805 WARNING ("java plugin: Option `%s' not allowed here.", child->key);
1810 DEBUG ("java plugin: jvm_argc = %zu;", jvm_argc);
1811 DEBUG ("java plugin: java_classes_list_len = %zu;", java_classes_list_len);
1812 DEBUG ("java plugin: java_plugin_configs_num = %zu;",
1813 java_plugin_configs_num);
1815 if ((success == 0) && (errors > 0))
1817 ERROR ("java plugin: All statements failed.");
1822 } /* }}} int cjni_config */
1825 /* Free the data contained in the `user_data_t' pointer passed to `cjni_read'
1826 * and `cjni_write'. In particular, delete the global reference to the Java
1828 static void cjni_callback_info_destroy (void *arg) /* {{{ */
1831 cjni_callback_info_t *cbi;
1833 DEBUG ("java plugin: cjni_callback_info_destroy (arg = %p);", arg);
1838 jvm_env = cjni_thread_attach ();
1839 if (jvm_env == NULL)
1841 ERROR ("java plugin: cjni_callback_info_destroy: cjni_thread_attach failed.");
1845 cbi = (cjni_callback_info_t *) arg;
1847 (*jvm_env)->DeleteGlobalRef (jvm_env, cbi->object);
1854 cjni_thread_detach ();
1855 } /* }}} void cjni_callback_info_destroy */
1857 /* Call the CB_TYPE_READ callback pointed to by the `user_data_t' pointer. */
1858 static int cjni_read (user_data_t *ud) /* {{{ */
1861 cjni_callback_info_t *cbi;
1866 ERROR ("java plugin: cjni_read: jvm == NULL");
1870 if ((ud == NULL) || (ud->data == NULL))
1872 ERROR ("java plugin: cjni_read: Invalid user data.");
1876 jvm_env = cjni_thread_attach ();
1877 if (jvm_env == NULL)
1880 cbi = (cjni_callback_info_t *) ud->data;
1882 status = (*jvm_env)->CallIntMethod (jvm_env, cbi->object,
1885 status = cjni_thread_detach ();
1888 ERROR ("java plugin: cjni_read: cjni_thread_detach failed.");
1893 } /* }}} int cjni_read */
1895 /* Call the CB_TYPE_WRITE callback pointed to by the `user_data_t' pointer. */
1896 static int cjni_write (const data_set_t *ds, const value_list_t *vl, /* {{{ */
1900 cjni_callback_info_t *cbi;
1906 ERROR ("java plugin: cjni_write: jvm == NULL");
1910 if ((ud == NULL) || (ud->data == NULL))
1912 ERROR ("java plugin: cjni_write: Invalid user data.");
1916 jvm_env = cjni_thread_attach ();
1917 if (jvm_env == NULL)
1920 cbi = (cjni_callback_info_t *) ud->data;
1922 vl_java = ctoj_value_list (jvm_env, ds, vl);
1923 if (vl_java == NULL)
1925 ERROR ("java plugin: cjni_write: ctoj_value_list failed.");
1929 status = (*jvm_env)->CallIntMethod (jvm_env,
1930 cbi->object, cbi->method, vl_java);
1932 (*jvm_env)->DeleteLocalRef (jvm_env, vl_java);
1934 status = cjni_thread_detach ();
1937 ERROR ("java plugin: cjni_write: cjni_thread_detach failed.");
1942 } /* }}} int cjni_write */
1944 /* Call the CB_TYPE_WRITE callback pointed to by the `user_data_t' pointer. */
1945 static int cjni_flush (int timeout, const char *identifier, /* {{{ */
1949 cjni_callback_info_t *cbi;
1950 jobject o_identifier;
1955 ERROR ("java plugin: cjni_flush: jvm == NULL");
1959 if ((ud == NULL) || (ud->data == NULL))
1961 ERROR ("java plugin: cjni_flush: Invalid user data.");
1965 jvm_env = cjni_thread_attach ();
1966 if (jvm_env == NULL)
1969 cbi = (cjni_callback_info_t *) ud->data;
1971 o_identifier = NULL;
1972 if (identifier != NULL)
1974 o_identifier = (*jvm_env)->NewStringUTF (jvm_env, identifier);
1975 if (o_identifier == NULL)
1977 ERROR ("java plugin: cjni_flush: NewStringUTF failed.");
1982 status = (*jvm_env)->CallIntMethod (jvm_env,
1983 cbi->object, cbi->method, (jint) timeout, o_identifier);
1985 (*jvm_env)->DeleteLocalRef (jvm_env, o_identifier);
1987 status = cjni_thread_detach ();
1990 ERROR ("java plugin: cjni_flush: cjni_thread_detach failed.");
1995 } /* }}} int cjni_flush */
1997 /* Iterate over `java_classes_list' and create one object of each class. This
1998 * will trigger the object's constructors, to the objects can register callback
2000 static int cjni_load_plugins (JNIEnv *jvm_env) /* {{{ */
2004 for (i = 0; i < java_classes_list_len; i++)
2006 java_plugin_class_t *class;
2007 jmethodID constructor_id;
2009 class = java_classes_list + i;
2011 DEBUG ("java plugin: Loading class %s", class->name);
2013 class->class = (*jvm_env)->FindClass (jvm_env, class->name);
2014 if (class->class == NULL)
2016 ERROR ("java plugin: cjni_load_plugins: FindClass (%s) failed.",
2021 constructor_id = (*jvm_env)->GetMethodID (jvm_env, class->class,
2023 if (constructor_id == NULL)
2025 ERROR ("java plugin: cjni_load_plugins: Could not find the constructor for `%s'.",
2030 class->object = (*jvm_env)->NewObject (jvm_env, class->class,
2032 if (class->object == NULL)
2034 ERROR ("java plugin: cjni_load_plugins: Could create a new `%s' object.",
2039 (*jvm_env)->NewGlobalRef (jvm_env, class->object);
2040 } /* for (i = 0; i < java_classes_list_len; i++) */
2043 } /* }}} int cjni_load_plugins */
2045 /* Iterate over `java_plugin_configs' and `java_callbacks' and call all
2046 * `config' callback methods for which a configuration is available. */
2047 static int cjni_config_plugins (JNIEnv *jvm_env) /* {{{ */
2053 for (i = 0; i < java_plugin_configs_num; i++)
2057 if (java_plugin_configs[i].ci == NULL)
2060 for (j = 0; j < java_callbacks_num; j++)
2062 if (java_callbacks[j].type != CB_TYPE_CONFIG)
2065 if (strcmp (java_plugin_configs[i].name, java_callbacks[j].name) == 0)
2069 if (j >= java_callbacks_num)
2071 NOTICE ("java plugin: Configuration for `%s' is present, but no such "
2072 "configuration callback has been registered.",
2073 java_plugin_configs[i].name);
2077 DEBUG ("java plugin: Configuring %s", java_plugin_configs[i].name);
2079 o_ocitem = ctoj_oconfig_item (jvm_env, java_plugin_configs[i].ci);
2080 if (o_ocitem == NULL)
2082 ERROR ("java plugin: cjni_config_plugins: ctoj_oconfig_item failed.");
2086 status = (*jvm_env)->CallIntMethod (jvm_env,
2087 java_callbacks[j].object, java_callbacks[j].method, o_ocitem);
2088 WARNING ("java plugin: Config callback for `%s' returned status %i.",
2089 java_plugin_configs[i].name, status);
2090 } /* for (i = 0; i < java_plugin_configs; i++) */
2093 } /* }}} int cjni_config_plugins */
2095 /* Iterate over `java_callbacks' and call all CB_TYPE_INIT callbacks. */
2096 static int cjni_init_plugins (JNIEnv *jvm_env) /* {{{ */
2101 for (i = 0; i < java_callbacks_num; i++)
2103 if (java_callbacks[i].type != CB_TYPE_INIT)
2106 DEBUG ("java plugin: Initializing %s", java_callbacks[i].name);
2108 status = (*jvm_env)->CallIntMethod (jvm_env,
2109 java_callbacks[i].object, java_callbacks[i].method);
2112 ERROR ("java plugin: Initializing `%s' failed with status %i. "
2113 "Removing read function.",
2114 java_callbacks[i].name, status);
2115 plugin_unregister_read (java_callbacks[i].name);
2120 } /* }}} int cjni_init_plugins */
2122 /* Iterate over `java_callbacks' and call all CB_TYPE_SHUTDOWN callbacks. */
2123 static int cjni_shutdown_plugins (JNIEnv *jvm_env) /* {{{ */
2128 for (i = 0; i < java_callbacks_num; i++)
2130 if (java_callbacks[i].type != CB_TYPE_SHUTDOWN)
2133 DEBUG ("java plugin: Shutting down %s", java_callbacks[i].name);
2135 status = (*jvm_env)->CallIntMethod (jvm_env,
2136 java_callbacks[i].object, java_callbacks[i].method);
2139 ERROR ("java plugin: Shutting down `%s' failed with status %i. ",
2140 java_callbacks[i].name, status);
2145 } /* }}} int cjni_shutdown_plugins */
2148 static int cjni_shutdown (void) /* {{{ */
2151 JavaVMAttachArgs args;
2159 memset (&args, 0, sizeof (args));
2160 args.version = JNI_VERSION_1_2;
2162 status = (*jvm)->AttachCurrentThread (jvm, (void **) &jvm_env, &args);
2165 ERROR ("java plugin: cjni_shutdown: AttachCurrentThread failed with status %i.",
2170 /* Execute all the shutdown functions registered by plugins. */
2171 cjni_shutdown_plugins (jvm_env);
2173 /* Release all the global references to callback functions */
2174 for (i = 0; i < java_callbacks_num; i++)
2176 if (java_callbacks[i].object != NULL)
2178 (*jvm_env)->DeleteGlobalRef (jvm_env, java_callbacks[i].object);
2179 java_callbacks[i].object = NULL;
2181 sfree (java_callbacks[i].name);
2183 java_callbacks_num = 0;
2184 sfree (java_callbacks);
2186 /* Release all the global references to directly loaded classes. */
2187 for (i = 0; i < java_classes_list_len; i++)
2189 if (java_classes_list[i].object != NULL)
2191 (*jvm_env)->DeleteGlobalRef (jvm_env, java_classes_list[i].object);
2192 java_classes_list[i].object = NULL;
2194 sfree (java_classes_list[i].name);
2196 java_classes_list_len = 0;
2197 sfree (java_classes_list);
2199 /* Destroy the JVM */
2200 (*jvm)->DestroyJavaVM (jvm);
2204 pthread_key_delete (jvm_env_key);
2206 /* Free the JVM argument list */
2207 for (i = 0; i < jvm_argc; i++)
2208 sfree (jvm_argv[i]);
2212 /* Free the copied configuration */
2213 for (i = 0; i < java_plugin_configs_num; i++)
2215 sfree (java_plugin_configs[i].name);
2216 oconfig_free (java_plugin_configs[i].ci);
2218 java_plugin_configs_num = 0;
2219 sfree (java_plugin_configs);
2222 } /* }}} int cjni_shutdown */
2224 /* Register ``native'' functions with the JVM. Native functions are C-functions
2225 * that can be called by Java code. */
2226 static int cjni_init_native (JNIEnv *jvm_env) /* {{{ */
2228 jclass api_class_ptr;
2231 api_class_ptr = (*jvm_env)->FindClass (jvm_env, "org.collectd.api.Collectd");
2232 if (api_class_ptr == NULL)
2234 ERROR ("cjni_init_native: Cannot find API class `org.collectd.api.Collectd'.");
2238 status = (*jvm_env)->RegisterNatives (jvm_env, api_class_ptr,
2239 jni_api_functions, (jint) jni_api_functions_num);
2242 ERROR ("cjni_init_native: RegisterNatives failed with status %i.", status);
2247 } /* }}} int cjni_init_native */
2249 /* Initialization: Create a JVM, load all configured classes and call their
2250 * `config' and `init' callback methods. */
2251 static int cjni_init (void) /* {{{ */
2254 JavaVMInitArgs vm_args;
2255 JavaVMOption vm_options[jvm_argc];
2263 status = pthread_key_create (&jvm_env_key, cjni_jvm_env_destroy);
2266 ERROR ("java plugin: cjni_init: pthread_key_create failed "
2267 "with status %i.", status);
2273 memset (&vm_args, 0, sizeof (vm_args));
2274 vm_args.version = JNI_VERSION_1_2;
2275 vm_args.options = vm_options;
2276 vm_args.nOptions = (jint) jvm_argc;
2278 for (i = 0; i < jvm_argc; i++)
2280 DEBUG ("java plugin: cjni_init: jvm_argv[%zu] = %s", i, jvm_argv[i]);
2281 vm_args.options[i].optionString = jvm_argv[i];
2284 vm_args.options[0].optionString = "-verbose:jni";
2285 vm_args.options[1].optionString = "-Djava.class.path=/home/octo/collectd/bindings/java";
2288 status = JNI_CreateJavaVM (&jvm, (void **) &jvm_env, (void **) &vm_args);
2291 ERROR ("cjni_init: JNI_CreateJavaVM failed with status %i.",
2295 assert (jvm != NULL);
2296 assert (jvm_env != NULL);
2298 /* Call RegisterNatives */
2299 status = cjni_init_native (jvm_env);
2302 ERROR ("cjni_init: cjni_init_native failed.");
2306 cjni_load_plugins (jvm_env);
2307 cjni_config_plugins (jvm_env);
2308 cjni_init_plugins (jvm_env);
2311 } /* }}} int cjni_init */
2313 void module_register (void)
2315 plugin_register_complex_config ("java", cjni_config);
2316 plugin_register_init ("java", cjni_init);
2317 plugin_register_shutdown ("java", cjni_shutdown);
2318 } /* void module_register (void) */
2320 /* vim: set sw=2 sts=2 et fdm=marker : */