1 /**
2 * collectd - src/java.c
3 * Copyright (C) 2009 Florian octo Forster
4 * Copyright (C) 2008 Justo Alonso Achaques
5 *
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.
9 *
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.
14 *
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
18 *
19 * Authors:
20 * Florian octo Forster <octo at verplant.org>
21 * Justo Alonso Achaques <justo.alonso at gmail.com>
22 **/
24 #include "collectd.h"
25 #include "plugin.h"
26 #include "common.h"
28 #include <pthread.h>
29 #include <jni.h>
31 #if !defined(JNI_VERSION_1_2)
32 # error "Need JNI 1.2 compatible interface!"
33 #endif
35 /*
36 * Types
37 */
38 struct java_plugin_s /* {{{ */
39 {
40 char *class_name;
41 jclass class_ptr;
42 jobject object_ptr;
44 oconfig_item_t *ci;
46 #define CJNI_FLAG_ENABLED 0x0001
47 int flags;
49 jmethodID m_config;
50 jmethodID m_init;
51 jmethodID m_write;
52 jmethodID m_shutdown;
53 };
54 typedef struct java_plugin_s java_plugin_t;
55 /* }}} */
57 struct cjni_jvm_env_s /* {{{ */
58 {
59 JNIEnv *jvm_env;
60 int reference_counter;
61 };
62 typedef struct cjni_jvm_env_s cjni_jvm_env_t;
63 /* }}} */
65 struct cjni_callback_info_s /* {{{ */
66 {
67 jclass class;
68 jobject object;
69 jmethodID method;
70 };
71 typedef struct cjni_callback_info_s cjni_callback_info_t;
72 /* }}} */
74 /*
75 * Global variables
76 */
77 static JavaVM *jvm = NULL;
78 static pthread_key_t jvm_env_key;
80 static char **jvm_argv = NULL;
81 static size_t jvm_argc = 0;
83 static java_plugin_t *java_plugins = NULL;
84 static size_t java_plugins_num = 0;
86 /*
87 * Prototypes
88 *
89 * Mostly functions that are needed by the Java interface functions.
90 */
91 static void cjni_callback_info_destroy (void *arg);
92 static int cjni_read (user_data_t *user_data);
94 /*
95 * C to Java conversion functions
96 */
97 static int ctoj_string (JNIEnv *jvm_env, /* {{{ */
98 const char *string,
99 jclass class_ptr, jobject object_ptr, const char *method_name)
100 {
101 jmethodID m_set;
102 jstring o_string;
104 /* Create a java.lang.String */
105 o_string = (*jvm_env)->NewStringUTF (jvm_env,
106 (string != NULL) ? string : "");
107 if (o_string == NULL)
108 {
109 ERROR ("java plugin: ctoj_string: NewStringUTF failed.");
110 return (-1);
111 }
113 /* Search for the `void setFoo (String s)' method. */
114 m_set = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
115 method_name, "(Ljava/lang/String;)V");
116 if (m_set == NULL)
117 {
118 ERROR ("java plugin: ctoj_string: Cannot find method `void %s (String)'.",
119 method_name);
120 (*jvm_env)->DeleteLocalRef (jvm_env, o_string);
121 return (-1);
122 }
124 /* Call the method. */
125 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_set, o_string);
127 /* Decrease reference counter on the java.lang.String object. */
128 (*jvm_env)->DeleteLocalRef (jvm_env, o_string);
130 return (0);
131 } /* }}} int ctoj_string */
133 static int ctoj_int (JNIEnv *jvm_env, /* {{{ */
134 jint value,
135 jclass class_ptr, jobject object_ptr, const char *method_name)
136 {
137 jmethodID m_set;
139 /* Search for the `void setFoo (int i)' method. */
140 m_set = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
141 method_name, "(I)V");
142 if (m_set == NULL)
143 {
144 ERROR ("java plugin: ctoj_int: Cannot find method `void %s (int)'.",
145 method_name);
146 return (-1);
147 }
149 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_set, value);
151 return (0);
152 } /* }}} int ctoj_int */
154 static int ctoj_long (JNIEnv *jvm_env, /* {{{ */
155 jlong value,
156 jclass class_ptr, jobject object_ptr, const char *method_name)
157 {
158 jmethodID m_set;
160 /* Search for the `void setFoo (long l)' method. */
161 m_set = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
162 method_name, "(J)V");
163 if (m_set == NULL)
164 {
165 ERROR ("java plugin: ctoj_long: Cannot find method `void %s (long)'.",
166 method_name);
167 return (-1);
168 }
170 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_set, value);
172 return (0);
173 } /* }}} int ctoj_long */
175 static int ctoj_double (JNIEnv *jvm_env, /* {{{ */
176 jdouble value,
177 jclass class_ptr, jobject object_ptr, const char *method_name)
178 {
179 jmethodID m_set;
181 /* Search for the `void setFoo (double d)' method. */
182 m_set = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
183 method_name, "(D)V");
184 if (m_set == NULL)
185 {
186 ERROR ("java plugin: ctoj_double: Cannot find method `void %s (double)'.",
187 method_name);
188 return (-1);
189 }
191 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_set, value);
193 return (0);
194 } /* }}} int ctoj_double */
196 /* Convert a jlong to a java.lang.Number */
197 static jobject ctoj_jlong_to_number (JNIEnv *jvm_env, jlong value) /* {{{ */
198 {
199 jclass c_long;
200 jmethodID m_long_constructor;
202 /* Look up the java.lang.Long class */
203 c_long = (*jvm_env)->FindClass (jvm_env, "java.lang.Long");
204 if (c_long == NULL)
205 {
206 ERROR ("java plugin: ctoj_jlong_to_number: Looking up the "
207 "java.lang.Long class failed.");
208 return (NULL);
209 }
211 m_long_constructor = (*jvm_env)->GetMethodID (jvm_env,
212 c_long, "<init>", "(J)V");
213 if (m_long_constructor == NULL)
214 {
215 ERROR ("java plugin: ctoj_jlong_to_number: Looking up the "
216 "`Long (long)' constructor failed.");
217 return (NULL);
218 }
220 return ((*jvm_env)->NewObject (jvm_env,
221 c_long, m_long_constructor, value));
222 } /* }}} jobject ctoj_jlong_to_number */
224 /* Convert a jdouble to a java.lang.Number */
225 static jobject ctoj_jdouble_to_number (JNIEnv *jvm_env, jdouble value) /* {{{ */
226 {
227 jclass c_double;
228 jmethodID m_double_constructor;
230 /* Look up the java.lang.Long class */
231 c_double = (*jvm_env)->FindClass (jvm_env, "java.lang.Double");
232 if (c_double == NULL)
233 {
234 ERROR ("java plugin: ctoj_jdouble_to_number: Looking up the "
235 "java.lang.Double class failed.");
236 return (NULL);
237 }
239 m_double_constructor = (*jvm_env)->GetMethodID (jvm_env,
240 c_double, "<init>", "(D)V");
241 if (m_double_constructor == NULL)
242 {
243 ERROR ("java plugin: ctoj_jdouble_to_number: Looking up the "
244 "`Double (double)' constructor failed.");
245 return (NULL);
246 }
248 return ((*jvm_env)->NewObject (jvm_env,
249 c_double, m_double_constructor, value));
250 } /* }}} jobject ctoj_jdouble_to_number */
252 /* Convert a value_t to a java.lang.Number */
253 static jobject ctoj_value_to_number (JNIEnv *jvm_env, /* {{{ */
254 value_t value, int ds_type)
255 {
256 if (ds_type == DS_TYPE_COUNTER)
257 return (ctoj_jlong_to_number (jvm_env, (jlong) value.counter));
258 else if (ds_type == DS_TYPE_GAUGE)
259 return (ctoj_jdouble_to_number (jvm_env, (jdouble) value.gauge));
260 else
261 return (NULL);
262 } /* }}} jobject ctoj_value_to_number */
264 /* Convert a data_source_t to a org.collectd.api.DataSource */
265 static jobject ctoj_data_source (JNIEnv *jvm_env, /* {{{ */
266 const data_source_t *dsrc)
267 {
268 jclass c_datasource;
269 jmethodID m_datasource_constructor;
270 jobject o_datasource;
271 int status;
273 /* Look up the DataSource class */
274 c_datasource = (*jvm_env)->FindClass (jvm_env,
275 "org.collectd.api.DataSource");
276 if (c_datasource == NULL)
277 {
278 ERROR ("java plugin: ctoj_data_source: "
279 "FindClass (org.collectd.api.DataSource) failed.");
280 return (NULL);
281 }
283 /* Lookup the `ValueList ()' constructor. */
284 m_datasource_constructor = (*jvm_env)->GetMethodID (jvm_env, c_datasource,
285 "<init>", "()V");
286 if (m_datasource_constructor == NULL)
287 {
288 ERROR ("java plugin: ctoj_data_source: Cannot find the "
289 "`DataSource ()' constructor.");
290 return (NULL);
291 }
293 /* Create a new instance. */
294 o_datasource = (*jvm_env)->NewObject (jvm_env, c_datasource,
295 m_datasource_constructor);
296 if (o_datasource == NULL)
297 {
298 ERROR ("java plugin: ctoj_data_source: "
299 "Creating a new DataSource instance failed.");
300 return (NULL);
301 }
303 /* Set name via `void setName (String name)' */
304 status = ctoj_string (jvm_env, dsrc->name,
305 c_datasource, o_datasource, "setName");
306 if (status != 0)
307 {
308 ERROR ("java plugin: ctoj_data_source: "
309 "ctoj_string (setName) failed.");
310 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
311 return (NULL);
312 }
314 /* Set type via `void setType (int type)' */
315 status = ctoj_int (jvm_env, dsrc->type,
316 c_datasource, o_datasource, "setType");
317 if (status != 0)
318 {
319 ERROR ("java plugin: ctoj_data_source: "
320 "ctoj_int (setType) failed.");
321 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
322 return (NULL);
323 }
325 /* Set min via `void setMin (double min)' */
326 status = ctoj_double (jvm_env, dsrc->min,
327 c_datasource, o_datasource, "setMin");
328 if (status != 0)
329 {
330 ERROR ("java plugin: ctoj_data_source: "
331 "ctoj_double (setMin) failed.");
332 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
333 return (NULL);
334 }
336 /* Set max via `void setMax (double max)' */
337 status = ctoj_double (jvm_env, dsrc->max,
338 c_datasource, o_datasource, "setMax");
339 if (status != 0)
340 {
341 ERROR ("java plugin: ctoj_data_source: "
342 "ctoj_double (setMax) failed.");
343 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
344 return (NULL);
345 }
347 return (o_datasource);
348 } /* }}} jobject ctoj_data_source */
350 /* Convert a oconfig_value_t to a org.collectd.api.OConfigValue */
351 static jobject ctoj_oconfig_value (JNIEnv *jvm_env, /* {{{ */
352 oconfig_value_t ocvalue)
353 {
354 jclass c_ocvalue;
355 jmethodID m_ocvalue_constructor;
356 jobject o_argument;
357 jobject o_ocvalue;
359 m_ocvalue_constructor = NULL;
360 o_argument = NULL;
362 c_ocvalue = (*jvm_env)->FindClass (jvm_env,
363 "org.collectd.api.OConfigValue");
364 if (c_ocvalue == NULL)
365 {
366 ERROR ("java plugin: ctoj_oconfig_value: "
367 "FindClass (org.collectd.api.OConfigValue) failed.");
368 return (NULL);
369 }
371 if (ocvalue.type == OCONFIG_TYPE_BOOLEAN)
372 {
373 jboolean tmp_boolean;
375 tmp_boolean = (ocvalue.value.boolean == 0) ? JNI_FALSE : JNI_TRUE;
377 m_ocvalue_constructor = (*jvm_env)->GetMethodID (jvm_env, c_ocvalue,
378 "<init>", "(Z)V");
379 if (m_ocvalue_constructor == NULL)
380 {
381 ERROR ("java plugin: ctoj_oconfig_value: Cannot find the "
382 "`OConfigValue (boolean)' constructor.");
383 return (NULL);
384 }
386 return ((*jvm_env)->NewObject (jvm_env,
387 c_ocvalue, m_ocvalue_constructor, tmp_boolean));
388 } /* if (ocvalue.type == OCONFIG_TYPE_BOOLEAN) */
389 else if (ocvalue.type == OCONFIG_TYPE_STRING)
390 {
391 m_ocvalue_constructor = (*jvm_env)->GetMethodID (jvm_env, c_ocvalue,
392 "<init>", "(Ljava/lang/String;)V");
393 if (m_ocvalue_constructor == NULL)
394 {
395 ERROR ("java plugin: ctoj_oconfig_value: Cannot find the "
396 "`OConfigValue (String)' constructor.");
397 return (NULL);
398 }
400 o_argument = (*jvm_env)->NewStringUTF (jvm_env, ocvalue.value.string);
401 if (o_argument == NULL)
402 {
403 ERROR ("java plugin: ctoj_oconfig_value: "
404 "Creating a String object failed.");
405 return (NULL);
406 }
407 }
408 else if (ocvalue.type == OCONFIG_TYPE_NUMBER)
409 {
410 m_ocvalue_constructor = (*jvm_env)->GetMethodID (jvm_env, c_ocvalue,
411 "<init>", "(Ljava/lang/Number;)V");
412 if (m_ocvalue_constructor == NULL)
413 {
414 ERROR ("java plugin: ctoj_oconfig_value: Cannot find the "
415 "`OConfigValue (Number)' constructor.");
416 return (NULL);
417 }
419 o_argument = ctoj_jdouble_to_number (jvm_env,
420 (jdouble) ocvalue.value.number);
421 if (o_argument == NULL)
422 {
423 ERROR ("java plugin: ctoj_oconfig_value: "
424 "Creating a Number object failed.");
425 return (NULL);
426 }
427 }
428 else
429 {
430 return (NULL);
431 }
433 assert (m_ocvalue_constructor != NULL);
434 assert (o_argument != NULL);
436 o_ocvalue = (*jvm_env)->NewObject (jvm_env,
437 c_ocvalue, m_ocvalue_constructor, o_argument);
438 if (o_ocvalue == NULL)
439 {
440 ERROR ("java plugin: ctoj_oconfig_value: "
441 "Creating an OConfigValue object failed.");
442 (*jvm_env)->DeleteLocalRef (jvm_env, o_argument);
443 return (NULL);
444 }
446 (*jvm_env)->DeleteLocalRef (jvm_env, o_argument);
447 return (o_ocvalue);
448 } /* }}} jobject ctoj_oconfig_value */
450 /* Convert a oconfig_item_t to a org.collectd.api.OConfigItem */
451 static jobject ctoj_oconfig_item (JNIEnv *jvm_env, /* {{{ */
452 const oconfig_item_t *ci)
453 {
454 jclass c_ocitem;
455 jmethodID m_ocitem_constructor;
456 jmethodID m_addvalue;
457 jmethodID m_addchild;
458 jobject o_key;
459 jobject o_ocitem;
460 int i;
462 c_ocitem = (*jvm_env)->FindClass (jvm_env, "org.collectd.api.OConfigItem");
463 if (c_ocitem == NULL)
464 {
465 ERROR ("java plugin: ctoj_oconfig_item: "
466 "FindClass (org.collectd.api.OConfigItem) failed.");
467 return (NULL);
468 }
470 /* Get the required methods: m_ocitem_constructor, m_addvalue, and m_addchild
471 * {{{ */
472 m_ocitem_constructor = (*jvm_env)->GetMethodID (jvm_env, c_ocitem,
473 "<init>", "(Ljava/lang/String;)V");
474 if (m_ocitem_constructor == NULL)
475 {
476 ERROR ("java plugin: ctoj_oconfig_item: Cannot find the "
477 "`OConfigItem (String)' constructor.");
478 return (NULL);
479 }
481 m_addvalue = (*jvm_env)->GetMethodID (jvm_env, c_ocitem,
482 "addValue", "(Lorg/collectd/api/OConfigValue;)V");
483 if (m_addvalue == NULL)
484 {
485 ERROR ("java plugin: ctoj_oconfig_item: Cannot find the "
486 "`addValue (OConfigValue)' method.");
487 return (NULL);
488 }
490 m_addchild = (*jvm_env)->GetMethodID (jvm_env, c_ocitem,
491 "addChild", "(Lorg/collectd/api/OConfigItem;)V");
492 if (m_addchild == NULL)
493 {
494 ERROR ("java plugin: ctoj_oconfig_item: Cannot find the "
495 "`addChild (OConfigItem)' method.");
496 return (NULL);
497 }
498 /* }}} */
500 /* Create a String object with the key.
501 * Needed for calling the constructor. */
502 o_key = (*jvm_env)->NewStringUTF (jvm_env, ci->key);
503 if (o_key == NULL)
504 {
505 ERROR ("java plugin: ctoj_oconfig_item: "
506 "Creating String object failed.");
507 return (NULL);
508 }
510 /* Create an OConfigItem object */
511 o_ocitem = (*jvm_env)->NewObject (jvm_env,
512 c_ocitem, m_ocitem_constructor, o_key);
513 if (o_ocitem == NULL)
514 {
515 ERROR ("java plugin: ctoj_oconfig_item: "
516 "Creating an OConfigItem object failed.");
517 (*jvm_env)->DeleteLocalRef (jvm_env, o_key);
518 return (NULL);
519 }
521 /* We don't need the String object any longer.. */
522 (*jvm_env)->DeleteLocalRef (jvm_env, o_key);
524 /* Call OConfigItem.addValue for each value */
525 for (i = 0; i < ci->values_num; i++) /* {{{ */
526 {
527 jobject o_value;
529 o_value = ctoj_oconfig_value (jvm_env, ci->values[i]);
530 if (o_value == NULL)
531 {
532 ERROR ("java plugin: ctoj_oconfig_item: "
533 "Creating an OConfigValue object failed.");
534 (*jvm_env)->DeleteLocalRef (jvm_env, o_ocitem);
535 return (NULL);
536 }
538 (*jvm_env)->CallVoidMethod (jvm_env, o_ocitem, m_addvalue, o_value);
539 (*jvm_env)->DeleteLocalRef (jvm_env, o_value);
540 } /* }}} for (i = 0; i < ci->values_num; i++) */
542 /* Call OConfigItem.addChild for each child */
543 for (i = 0; i < ci->children_num; i++) /* {{{ */
544 {
545 jobject o_child;
547 o_child = ctoj_oconfig_item (jvm_env, ci->children + i);
548 if (o_child == NULL)
549 {
550 ERROR ("java plugin: ctoj_oconfig_item: "
551 "Creating an OConfigItem object failed.");
552 (*jvm_env)->DeleteLocalRef (jvm_env, o_ocitem);
553 return (NULL);
554 }
556 (*jvm_env)->CallVoidMethod (jvm_env, o_ocitem, m_addvalue, o_child);
557 (*jvm_env)->DeleteLocalRef (jvm_env, o_child);
558 } /* }}} for (i = 0; i < ci->children_num; i++) */
560 return (o_ocitem);
561 } /* }}} jobject ctoj_oconfig_item */
563 /* Convert a data_set_t to a org.collectd.api.DataSet */
564 static jobject ctoj_data_set (JNIEnv *jvm_env, const data_set_t *ds) /* {{{ */
565 {
566 jclass c_dataset;
567 jmethodID m_constructor;
568 jmethodID m_add;
569 jobject o_type;
570 jobject o_dataset;
571 int i;
573 /* Look up the org.collectd.api.DataSet class */
574 c_dataset = (*jvm_env)->FindClass (jvm_env, "org.collectd.api.DataSet");
575 if (c_dataset == NULL)
576 {
577 ERROR ("java plugin: ctoj_data_set: Looking up the "
578 "org.collectd.api.DataSet class failed.");
579 return (NULL);
580 }
582 /* Search for the `DataSet (String type)' constructor. */
583 m_constructor = (*jvm_env)->GetMethodID (jvm_env,
584 c_dataset, "<init>", "(Ljava.lang.String;)V");
585 if (m_constructor == NULL)
586 {
587 ERROR ("java plugin: ctoj_data_set: Looking up the "
588 "`DataSet (String)' constructor failed.");
589 return (NULL);
590 }
592 /* Search for the `void addDataSource (DataSource)' method. */
593 m_add = (*jvm_env)->GetMethodID (jvm_env,
594 c_dataset, "addDataSource", "(Lorg.collectd.api.DataSource;)V");
595 if (m_add == NULL)
596 {
597 ERROR ("java plugin: ctoj_data_set: Looking up the "
598 "`addDataSource (DataSource)' method failed.");
599 return (NULL);
600 }
602 o_type = (*jvm_env)->NewStringUTF (jvm_env, ds->type);
603 if (o_type == NULL)
604 {
605 ERROR ("java plugin: ctoj_data_set: Creating a String object failed.");
606 return (NULL);
607 }
609 o_dataset = (*jvm_env)->NewObject (jvm_env,
610 c_dataset, m_constructor, o_type);
611 if (o_dataset == NULL)
612 {
613 ERROR ("java plugin: ctoj_data_set: Creating a DataSet object failed.");
614 (*jvm_env)->DeleteLocalRef (jvm_env, o_type);
615 return (NULL);
616 }
618 /* Decrease reference counter on the java.lang.String object. */
619 (*jvm_env)->DeleteLocalRef (jvm_env, o_type);
621 for (i = 0; i < ds->ds_num; i++)
622 {
623 jobject o_datasource;
625 o_datasource = ctoj_data_source (jvm_env, ds->ds + i);
626 if (o_datasource == NULL)
627 {
628 ERROR ("java plugin: ctoj_data_set: ctoj_data_source (%s.%s) failed",
629 ds->type, ds->ds[i].name);
630 (*jvm_env)->DeleteLocalRef (jvm_env, o_dataset);
631 return (NULL);
632 }
634 (*jvm_env)->CallVoidMethod (jvm_env, o_dataset, m_add, o_datasource);
636 (*jvm_env)->DeleteLocalRef (jvm_env, o_datasource);
637 } /* for (i = 0; i < ds->ds_num; i++) */
639 return (o_dataset);
640 } /* }}} jobject ctoj_data_set */
642 static int ctoj_value_list_add_value (JNIEnv *jvm_env, /* {{{ */
643 value_t value, int ds_type,
644 jclass class_ptr, jobject object_ptr)
645 {
646 jmethodID m_addvalue;
647 jobject o_number;
649 m_addvalue = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
650 "addValue", "(Ljava/lang/Number;)V");
651 if (m_addvalue == NULL)
652 {
653 ERROR ("java plugin: ctoj_value_list_add_value: "
654 "Cannot find method `void addValue (Number)'.");
655 return (-1);
656 }
658 o_number = ctoj_value_to_number (jvm_env, value, ds_type);
659 if (o_number == NULL)
660 {
661 ERROR ("java plugin: ctoj_value_list_add_value: "
662 "ctoj_value_to_number failed.");
663 return (-1);
664 }
666 (*jvm_env)->CallVoidMethod (jvm_env, object_ptr, m_addvalue, o_number);
668 (*jvm_env)->DeleteLocalRef (jvm_env, o_number);
670 return (0);
671 } /* }}} int ctoj_value_list_add_value */
673 static int ctoj_value_list_add_data_set (JNIEnv *jvm_env, /* {{{ */
674 jclass c_valuelist, jobject o_valuelist, const data_set_t *ds)
675 {
676 jmethodID m_setdataset;
677 jobject o_dataset;
679 /* Look for the `void setDataSource (List<DataSource> ds)' method. */
680 m_setdataset = (*jvm_env)->GetMethodID (jvm_env, c_valuelist,
681 "setDataSet", "(Lorg.collectd.api.DataSet;)V");
682 if (m_setdataset == NULL)
683 {
684 ERROR ("java plugin: ctoj_value_list_add_data_set: "
685 "Cannot find the `void setDataSet (DataSet)' method.");
686 return (-1);
687 }
689 /* Create a DataSet object. */
690 o_dataset = ctoj_data_set (jvm_env, ds);
691 if (o_dataset == NULL)
692 {
693 ERROR ("java plugin: ctoj_value_list_add_data_set: "
694 "ctoj_data_set (%s) failed.", ds->type);
695 return (-1);
696 }
698 /* Actually call the method. */
699 (*jvm_env)->CallVoidMethod (jvm_env,
700 o_valuelist, m_setdataset, o_dataset);
702 /* Decrease reference counter on the List<DataSource> object. */
703 (*jvm_env)->DeleteLocalRef (jvm_env, o_dataset);
705 return (0);
706 } /* }}} int ctoj_value_list_add_data_set */
708 static jobject ctoj_value_list (JNIEnv *jvm_env, /* {{{ */
709 const data_set_t *ds, const value_list_t *vl)
710 {
711 jclass c_valuelist;
712 jmethodID m_valuelist_constructor;
713 jobject o_valuelist;
714 int status;
715 int i;
717 /* First, create a new ValueList instance..
718 * Look up the class.. */
719 c_valuelist = (*jvm_env)->FindClass (jvm_env,
720 "org.collectd.api.ValueList");
721 if (c_valuelist == NULL)
722 {
723 ERROR ("java plugin: ctoj_value_list: "
724 "FindClass (org.collectd.api.ValueList) failed.");
725 return (NULL);
726 }
728 /* Lookup the `ValueList ()' constructor. */
729 m_valuelist_constructor = (*jvm_env)->GetMethodID (jvm_env, c_valuelist,
730 "<init>", "()V");
731 if (m_valuelist_constructor == NULL)
732 {
733 ERROR ("java plugin: ctoj_value_list: Cannot find the "
734 "`ValueList ()' constructor.");
735 return (NULL);
736 }
738 /* Create a new instance. */
739 o_valuelist = (*jvm_env)->NewObject (jvm_env, c_valuelist,
740 m_valuelist_constructor);
741 if (o_valuelist == NULL)
742 {
743 ERROR ("java plugin: ctoj_value_list: Creating a new ValueList instance "
744 "failed.");
745 return (NULL);
746 }
748 status = ctoj_value_list_add_data_set (jvm_env,
749 c_valuelist, o_valuelist, ds);
750 if (status != 0)
751 {
752 ERROR ("java plugin: ctoj_value_list: "
753 "ctoj_value_list_add_data_set failed.");
754 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist);
755 return (NULL);
756 }
758 /* Set the strings.. */
759 #define SET_STRING(str,method_name) do { \
760 status = ctoj_string (jvm_env, str, \
761 c_valuelist, o_valuelist, method_name); \
762 if (status != 0) { \
763 ERROR ("java plugin: ctoj_value_list: jtoc_string (%s) failed.", \
764 method_name); \
765 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist); \
766 return (NULL); \
767 } } while (0)
769 SET_STRING (vl->host, "setHost");
770 SET_STRING (vl->plugin, "setPlugin");
771 SET_STRING (vl->plugin_instance, "setPluginInstance");
772 SET_STRING (vl->type, "setType");
773 SET_STRING (vl->type_instance, "setTypeInstance");
775 #undef SET_STRING
777 /* Set the `time' member. Java stores time in milliseconds. */
778 status = ctoj_long (jvm_env, ((jlong) vl->time) * ((jlong) 1000),
779 c_valuelist, o_valuelist, "setTime");
780 if (status != 0)
781 {
782 ERROR ("java plugin: ctoj_value_list: ctoj_long (setTime) failed.");
783 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist);
784 return (NULL);
785 }
787 /* Set the `interval' member.. */
788 status = ctoj_long (jvm_env, (jlong) vl->interval,
789 c_valuelist, o_valuelist, "setInterval");
790 if (status != 0)
791 {
792 ERROR ("java plugin: ctoj_value_list: ctoj_long (setInterval) failed.");
793 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist);
794 return (NULL);
795 }
797 for (i = 0; i < vl->values_len; i++)
798 {
799 status = ctoj_value_list_add_value (jvm_env, vl->values[i], ds->ds[i].type,
800 c_valuelist, o_valuelist);
801 if (status != 0)
802 {
803 ERROR ("java plugin: ctoj_value_list: "
804 "ctoj_value_list_add_value failed.");
805 (*jvm_env)->DeleteLocalRef (jvm_env, o_valuelist);
806 return (NULL);
807 }
808 }
810 return (o_valuelist);
811 } /* }}} int ctoj_value_list */
813 /*
814 * Java to C conversion functions
815 */
816 static int jtoc_string (JNIEnv *jvm_env, /* {{{ */
817 char *buffer, size_t buffer_size,
818 jclass class_ptr, jobject object_ptr, const char *method_name)
819 {
820 jmethodID method_id;
821 jobject string_obj;
822 const char *c_str;
824 method_id = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
825 method_name, "()Ljava/lang/String;");
826 if (method_id == NULL)
827 {
828 ERROR ("java plugin: jtoc_string: Cannot find method `String %s ()'.",
829 method_name);
830 return (-1);
831 }
833 string_obj = (*jvm_env)->CallObjectMethod (jvm_env, object_ptr, method_id);
834 if (string_obj == NULL)
835 {
836 ERROR ("java plugin: jtoc_string: CallObjectMethod (%s) failed.",
837 method_name);
838 return (-1);
839 }
841 c_str = (*jvm_env)->GetStringUTFChars (jvm_env, string_obj, 0);
842 if (c_str == NULL)
843 {
844 ERROR ("java plugin: jtoc_string: GetStringUTFChars failed.");
845 (*jvm_env)->DeleteLocalRef (jvm_env, string_obj);
846 return (-1);
847 }
849 sstrncpy (buffer, c_str, buffer_size);
851 (*jvm_env)->ReleaseStringUTFChars (jvm_env, string_obj, c_str);
852 (*jvm_env)->DeleteLocalRef (jvm_env, string_obj);
854 return (0);
855 } /* }}} int jtoc_string */
857 static int jtoc_long (JNIEnv *jvm_env, /* {{{ */
858 jlong *ret_value,
859 jclass class_ptr, jobject object_ptr, const char *method_name)
860 {
861 jmethodID method_id;
863 method_id = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
864 method_name, "()J");
865 if (method_id == NULL)
866 {
867 ERROR ("java plugin: jtoc_long: Cannot find method `long %s ()'.",
868 method_name);
869 return (-1);
870 }
872 *ret_value = (*jvm_env)->CallLongMethod (jvm_env, object_ptr, method_id);
874 return (0);
875 } /* }}} int jtoc_long */
877 static int jtoc_double (JNIEnv *jvm_env, /* {{{ */
878 jdouble *ret_value,
879 jclass class_ptr, jobject object_ptr, const char *method_name)
880 {
881 jmethodID method_id;
883 method_id = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
884 method_name, "()D");
885 if (method_id == NULL)
886 {
887 ERROR ("java plugin: jtoc_string: Cannot find method `double %s ()'.",
888 method_name);
889 return (-1);
890 }
892 *ret_value = (*jvm_env)->CallDoubleMethod (jvm_env, object_ptr, method_id);
894 return (0);
895 } /* }}} int jtoc_double */
897 static int jtoc_value (JNIEnv *jvm_env, /* {{{ */
898 value_t *ret_value, int ds_type, jobject object_ptr)
899 {
900 jclass class_ptr;
901 int status;
903 class_ptr = (*jvm_env)->GetObjectClass (jvm_env, object_ptr);
905 if (ds_type == DS_TYPE_COUNTER)
906 {
907 jlong tmp_long;
909 status = jtoc_long (jvm_env, &tmp_long,
910 class_ptr, object_ptr, "longValue");
911 if (status != 0)
912 {
913 ERROR ("java plugin: jtoc_value: "
914 "jtoc_long failed.");
915 return (-1);
916 }
917 (*ret_value).counter = (counter_t) tmp_long;
918 }
919 else
920 {
921 jdouble tmp_double;
923 status = jtoc_double (jvm_env, &tmp_double,
924 class_ptr, object_ptr, "doubleValue");
925 if (status != 0)
926 {
927 ERROR ("java plugin: jtoc_value: "
928 "jtoc_double failed.");
929 return (-1);
930 }
931 (*ret_value).gauge = (gauge_t) tmp_double;
932 }
934 return (0);
935 } /* }}} int jtoc_value */
937 static int jtoc_values_array (JNIEnv *jvm_env, /* {{{ */
938 const data_set_t *ds, value_list_t *vl,
939 jclass class_ptr, jobject object_ptr)
940 {
941 jmethodID m_getvalues;
942 jmethodID m_toarray;
943 jobject o_list;
944 jobjectArray o_number_array;
946 value_t *values;
947 int values_num;
948 int i;
950 values_num = ds->ds_num;
952 values = NULL;
953 o_number_array = NULL;
954 o_list = NULL;
956 #define BAIL_OUT(status) \
957 free (values); \
958 if (o_number_array != NULL) \
959 (*jvm_env)->DeleteLocalRef (jvm_env, o_number_array); \
960 if (o_list != NULL) \
961 (*jvm_env)->DeleteLocalRef (jvm_env, o_list); \
962 return (status);
964 /* Call: List<Number> ValueList.getValues () */
965 m_getvalues = (*jvm_env)->GetMethodID (jvm_env, class_ptr,
966 "getValues", "()Ljava/util/List;");
967 if (m_getvalues == NULL)
968 {
969 ERROR ("java plugin: jtoc_values_array: "
970 "Cannot find method `List getValues ()'.");
971 BAIL_OUT (-1);
972 }
974 o_list = (*jvm_env)->CallObjectMethod (jvm_env, object_ptr, m_getvalues);
975 if (o_list == NULL)
976 {
977 ERROR ("java plugin: jtoc_values_array: "
978 "CallObjectMethod (getValues) failed.");
979 BAIL_OUT (-1);
980 }
982 /* Call: Number[] List.toArray () */
983 m_toarray = (*jvm_env)->GetMethodID (jvm_env,
984 (*jvm_env)->GetObjectClass (jvm_env, o_list),
985 "toArray", "()[Ljava/lang/Object;");
986 if (m_toarray == NULL)
987 {
988 ERROR ("java plugin: jtoc_values_array: "
989 "Cannot find method `Object[] toArray ()'.");
990 BAIL_OUT (-1);
991 }
993 o_number_array = (*jvm_env)->CallObjectMethod (jvm_env, o_list, m_toarray);
994 if (o_number_array == NULL)
995 {
996 ERROR ("java plugin: jtoc_values_array: "
997 "CallObjectMethod (toArray) failed.");
998 BAIL_OUT (-1);
999 }
1001 values = calloc (values_num, sizeof (value_t));
1002 if (values == NULL)
1003 {
1004 ERROR ("java plugin: jtoc_values_array: calloc failed.");
1005 BAIL_OUT (-1);
1006 }
1008 for (i = 0; i < values_num; i++)
1009 {
1010 jobject o_number;
1011 int status;
1013 o_number = (*jvm_env)->GetObjectArrayElement (jvm_env,
1014 o_number_array, (jsize) i);
1015 if (o_number == NULL)
1016 {
1017 ERROR ("java plugin: jtoc_values_array: "
1018 "GetObjectArrayElement (%i) failed.", i);
1019 BAIL_OUT (-1);
1020 }
1022 status = jtoc_value (jvm_env, values + i, ds->ds[i].type, o_number);
1023 if (status != 0)
1024 {
1025 ERROR ("java plugin: jtoc_values_array: "
1026 "jtoc_value (%i) failed.", i);
1027 BAIL_OUT (-1);
1028 }
1029 } /* for (i = 0; i < values_num; i++) */
1031 vl->values = values;
1032 vl->values_len = values_num;
1034 #undef BAIL_OUT
1035 (*jvm_env)->DeleteLocalRef (jvm_env, o_number_array);
1036 (*jvm_env)->DeleteLocalRef (jvm_env, o_list);
1037 return (0);
1038 } /* }}} int jtoc_values_array */
1040 /* Convert a org.collectd.api.ValueList to a value_list_t. */
1041 static int jtoc_value_list (JNIEnv *jvm_env, value_list_t *vl, /* {{{ */
1042 jobject object_ptr)
1043 {
1044 jclass class_ptr;
1045 int status;
1046 jlong tmp_long;
1047 const data_set_t *ds;
1049 class_ptr = (*jvm_env)->GetObjectClass (jvm_env, object_ptr);
1050 if (class_ptr == NULL)
1051 {
1052 ERROR ("java plugin: jtoc_value_list: GetObjectClass failed.");
1053 return (-1);
1054 }
1056 #define SET_STRING(buffer,method) do { \
1057 status = jtoc_string (jvm_env, buffer, sizeof (buffer), \
1058 class_ptr, object_ptr, method); \
1059 if (status != 0) { \
1060 ERROR ("java plugin: jtoc_value_list: jtoc_string (%s) failed.", \
1061 method); \
1062 return (-1); \
1063 } } while (0)
1065 SET_STRING(vl->type, "getType");
1067 ds = plugin_get_ds (vl->type);
1068 if (ds == NULL)
1069 {
1070 ERROR ("java plugin: jtoc_value_list: Data-set `%s' is not defined. "
1071 "Please consult the types.db(5) manpage for mor information.",
1072 vl->type);
1073 return (-1);
1074 }
1076 SET_STRING(vl->host, "getHost");
1077 SET_STRING(vl->plugin, "getPlugin");
1078 SET_STRING(vl->plugin_instance, "getPluginInstance");
1079 SET_STRING(vl->type_instance, "getTypeInstance");
1081 #undef SET_STRING
1083 status = jtoc_long (jvm_env, &tmp_long, class_ptr, object_ptr, "getTime");
1084 if (status != 0)
1085 {
1086 ERROR ("java plugin: jtoc_value_list: jtoc_long (getTime) failed.");
1087 return (-1);
1088 }
1089 /* Java measures time in milliseconds. */
1090 vl->time = (time_t) (tmp_long / ((jlong) 1000));
1092 status = jtoc_long (jvm_env, &tmp_long,
1093 class_ptr, object_ptr, "getInterval");
1094 if (status != 0)
1095 {
1096 ERROR ("java plugin: jtoc_value_list: jtoc_long (getInterval) failed.");
1097 return (-1);
1098 }
1099 vl->interval = (int) tmp_long;
1101 status = jtoc_values_array (jvm_env, ds, vl, class_ptr, object_ptr);
1102 if (status != 0)
1103 {
1104 ERROR ("java plugin: jtoc_value_list: jtoc_values_array failed.");
1105 return (-1);
1106 }
1108 return (0);
1109 } /* }}} int jtoc_value_list */
1111 static cjni_callback_info_t *cjni_callback_info_create (JNIEnv *jvm_env, /* {{{ */
1112 jobject obj, const char *method_name, const char *signature)
1113 {
1114 cjni_callback_info_t *cbi;
1116 cbi = (cjni_callback_info_t *) malloc (sizeof (*cbi));
1117 if (cbi == NULL)
1118 {
1119 ERROR ("java plugin: cjni_callback_info_create: malloc failed.");
1120 return (NULL);
1121 }
1122 memset (cbi, 0, sizeof (*cbi));
1124 cbi->class = (*jvm_env)->GetObjectClass (jvm_env, obj);
1125 if (cbi->class == NULL)
1126 {
1127 ERROR ("java plugin: cjni_callback_info_create: GetObjectClass failed.");
1128 free (cbi);
1129 return (NULL);
1130 }
1132 cbi->object = obj;
1134 cbi->method = (*jvm_env)->GetMethodID (jvm_env, cbi->class,
1135 method_name, signature);
1136 if (cbi->method == NULL)
1137 {
1138 ERROR ("java plugin: cjni_callback_info_create: "
1139 "Cannot find the `%s' method with signature `%s'.",
1140 method_name, signature);
1141 free (cbi);
1142 return (NULL);
1143 }
1145 (*jvm_env)->NewGlobalRef (jvm_env, obj);
1147 return (cbi);
1148 } /* }}} cjni_callback_info_t cjni_callback_info_create */
1150 /*
1151 * Functions accessible from Java
1152 */
1153 static jint JNICALL cjni_api_dispatch_values (JNIEnv *jvm_env, /* {{{ */
1154 jobject this, jobject java_vl)
1155 {
1156 value_list_t vl = VALUE_LIST_INIT;
1157 int status;
1159 DEBUG ("cjni_api_dispatch_values: java_vl = %p;", (void *) java_vl);
1161 status = jtoc_value_list (jvm_env, &vl, java_vl);
1162 if (status != 0)
1163 {
1164 ERROR ("java plugin: cjni_api_dispatch_values: jtoc_value_list failed.");
1165 return (-1);
1166 }
1168 status = plugin_dispatch_values (&vl);
1170 sfree (vl.values);
1172 return (status);
1173 } /* }}} jint cjni_api_dispatch_values */
1175 static jobject JNICALL cjni_api_get_ds (JNIEnv *jvm_env, /* {{{ */
1176 jobject this, jobject o_string_type)
1177 {
1178 const char *ds_name;
1179 const data_set_t *ds;
1180 jobject o_dataset;
1182 ds_name = (*jvm_env)->GetStringUTFChars (jvm_env, o_string_type, 0);
1183 if (ds_name == NULL)
1184 {
1185 ERROR ("java plugin: cjni_api_get_ds: GetStringUTFChars failed.");
1186 return (NULL);
1187 }
1189 ds = plugin_get_ds (ds_name);
1190 DEBUG ("java plugin: cjni_api_get_ds: "
1191 "plugin_get_ds (%s) = %p;", ds_name, (void *) ds);
1193 (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_string_type, ds_name);
1195 if (ds == NULL)
1196 return (NULL);
1198 o_dataset = ctoj_data_set (jvm_env, ds);
1199 return (o_dataset);
1200 } /* }}} jint cjni_api_get_ds */
1202 static jint JNICALL cjni_api_register_read (JNIEnv *jvm_env, /* {{{ */
1203 jobject this, jobject o_name, jobject o_read)
1204 {
1205 const char *c_name;
1206 user_data_t ud;
1207 cjni_callback_info_t *cbi;
1209 c_name = (*jvm_env)->GetStringUTFChars (jvm_env, o_name, 0);
1210 if (c_name == NULL)
1211 {
1212 ERROR ("java plugin: cjni_api_register_read: GetStringUTFChars failed.");
1213 return (-1);
1214 }
1216 cbi = cjni_callback_info_create (jvm_env, o_read, "Read", "()I");
1217 if (cbi == NULL)
1218 return (-1);
1220 memset (&ud, 0, sizeof (ud));
1221 ud.data = (void *) cbi;
1222 ud.free_func = cjni_callback_info_destroy;
1224 plugin_register_complex_read (c_name, cjni_read, &ud);
1226 (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_name, c_name);
1227 (*jvm_env)->DeleteLocalRef (jvm_env, o_read);
1229 return (0);
1230 } /* }}} jint cjni_api_register_read */
1232 static JNINativeMethod jni_api_functions[] =
1233 {
1234 { "DispatchValues",
1235 "(Lorg/collectd/api/ValueList;)I",
1236 cjni_api_dispatch_values },
1238 { "GetDS",
1239 "(Ljava/lang/String;)Lorg/collectd/api/DataSet;",
1240 cjni_api_get_ds },
1242 { "RegisterRead",
1243 "(Ljava/lang/String;Lorg/collectd/api/CollectdReadInterface;)I",
1244 cjni_api_register_read }
1245 };
1246 static size_t jni_api_functions_num = sizeof (jni_api_functions)
1247 / sizeof (jni_api_functions[0]);
1249 /*
1250 * Functions
1251 */
1252 static JNIEnv *cjni_thread_attach (void) /* {{{ */
1253 {
1254 cjni_jvm_env_t *cjni_env;
1255 JNIEnv *jvm_env;
1257 cjni_env = pthread_getspecific (jvm_env_key);
1258 if (cjni_env == NULL)
1259 {
1260 /* This pointer is free'd in `cjni_jvm_env_destroy'. */
1261 cjni_env = (cjni_jvm_env_t *) malloc (sizeof (*cjni_env));
1262 if (cjni_env == NULL)
1263 {
1264 ERROR ("java plugin: cjni_thread_attach: malloc failed.");
1265 return (NULL);
1266 }
1267 memset (cjni_env, 0, sizeof (*cjni_env));
1268 cjni_env->reference_counter = 0;
1269 cjni_env->jvm_env = NULL;
1271 pthread_setspecific (jvm_env_key, cjni_env);
1272 }
1274 if (cjni_env->reference_counter > 0)
1275 {
1276 cjni_env->reference_counter++;
1277 jvm_env = cjni_env->jvm_env;
1278 }
1279 else
1280 {
1281 int status;
1282 JavaVMAttachArgs args;
1284 assert (cjni_env->jvm_env == NULL);
1286 memset (&args, 0, sizeof (args));
1287 args.version = JNI_VERSION_1_2;
1289 status = (*jvm)->AttachCurrentThread (jvm, (void *) &jvm_env, (void *) &args);
1290 if (status != 0)
1291 {
1292 ERROR ("java plugin: cjni_thread_attach: AttachCurrentThread failed "
1293 "with status %i.", status);
1294 return (NULL);
1295 }
1297 cjni_env->reference_counter = 1;
1298 cjni_env->jvm_env = jvm_env;
1299 }
1301 DEBUG ("java plugin: cjni_thread_attach: cjni_env->reference_counter = %i",
1302 cjni_env->reference_counter);
1303 assert (jvm_env != NULL);
1304 return (jvm_env);
1305 } /* }}} JNIEnv *cjni_thread_attach */
1307 static int cjni_thread_detach (void) /* {{{ */
1308 {
1309 cjni_jvm_env_t *cjni_env;
1310 int status;
1312 cjni_env = pthread_getspecific (jvm_env_key);
1313 if (cjni_env == NULL)
1314 {
1315 ERROR ("java plugin: cjni_thread_detach: pthread_getspecific failed.");
1316 return (-1);
1317 }
1319 assert (cjni_env->reference_counter > 0);
1320 assert (cjni_env->jvm_env != NULL);
1322 cjni_env->reference_counter--;
1323 DEBUG ("java plugin: cjni_thread_detach: cjni_env->reference_counter = %i",
1324 cjni_env->reference_counter);
1326 if (cjni_env->reference_counter > 0)
1327 return (0);
1329 status = (*jvm)->DetachCurrentThread (jvm);
1330 if (status != 0)
1331 {
1332 ERROR ("java plugin: cjni_thread_detach: DetachCurrentThread failed "
1333 "with status %i.", status);
1334 }
1336 cjni_env->reference_counter = 0;
1337 cjni_env->jvm_env = NULL;
1339 return (0);
1340 } /* }}} JNIEnv *cjni_thread_attach */
1342 static void cjni_jvm_env_destroy (void *args) /* {{{ */
1343 {
1344 cjni_jvm_env_t *cjni_env;
1346 if (args == NULL)
1347 return;
1349 cjni_env = (cjni_jvm_env_t *) args;
1351 if (cjni_env->reference_counter > 0)
1352 {
1353 ERROR ("java plugin: cjni_jvm_env_destroy: "
1354 "cjni_env->reference_counter = %i;", cjni_env->reference_counter);
1355 }
1357 if (cjni_env->jvm_env != NULL)
1358 {
1359 ERROR ("java plugin: cjni_jvm_env_destroy: cjni_env->jvm_env = %p;",
1360 (void *) cjni_env->jvm_env);
1361 }
1363 /* The pointer is allocated in `cjni_thread_attach' */
1364 free (cjni_env);
1365 } /* }}} void cjni_jvm_env_destroy */
1367 /*
1368 * Delete a global reference, set by the various `Register*' functions.
1369 */
1370 static void cjni_callback_info_destroy (void *arg) /* {{{ */
1371 {
1372 JNIEnv *jni_env;
1373 cjni_callback_info_t *cbi;
1375 DEBUG ("java plugin: cjni_callback_info_destroy (arg = %p);", arg);
1377 if (arg == NULL)
1378 return;
1380 jni_env = cjni_thread_attach ();
1381 if (jni_env == NULL)
1382 {
1383 ERROR ("java plugin: cjni_callback_info_destroy: cjni_thread_attach failed.");
1384 return;
1385 }
1387 cbi = (cjni_callback_info_t *) arg;
1389 (*jni_env)->DeleteGlobalRef (jni_env, cbi->object);
1391 cbi->method = NULL;
1392 cbi->object = NULL;
1393 cbi->class = NULL;
1394 free (cbi);
1396 cjni_thread_detach ();
1397 } /* }}} void cjni_callback_info_destroy */
1399 static int cjni_config_add_jvm_arg (oconfig_item_t *ci) /* {{{ */
1400 {
1401 char **tmp;
1403 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
1404 {
1405 WARNING ("java plugin: `JVMArg' needs exactly one string argument.");
1406 return (-1);
1407 }
1409 tmp = (char **) realloc (jvm_argv, sizeof (char *) * (jvm_argc + 1));
1410 if (tmp == NULL)
1411 {
1412 ERROR ("java plugin: realloc failed.");
1413 return (-1);
1414 }
1415 jvm_argv = tmp;
1417 jvm_argv[jvm_argc] = strdup (ci->values[0].value.string);
1418 if (jvm_argv[jvm_argc] == NULL)
1419 {
1420 ERROR ("java plugin: strdup failed.");
1421 return (-1);
1422 }
1423 jvm_argc++;
1425 return (0);
1426 } /* }}} int cjni_config_add_jvm_arg */
1428 static int cjni_config_load_plugin (oconfig_item_t *ci) /* {{{ */
1429 {
1430 java_plugin_t *jp;
1432 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
1433 {
1434 WARNING ("java plugin: `LoadPlugin' needs exactly one string argument.");
1435 return (-1);
1436 }
1438 jp = (java_plugin_t *) realloc (java_plugins,
1439 sizeof (*java_plugins) * (java_plugins_num + 1));
1440 if (jp == NULL)
1441 {
1442 ERROR ("java plugin: realloc failed.");
1443 return (-1);
1444 }
1445 java_plugins = jp;
1446 jp = java_plugins + java_plugins_num;
1448 memset (jp, 0, sizeof (*jp));
1449 jp->class_name = strdup (ci->values[0].value.string);
1450 if (jp->class_name == NULL)
1451 {
1452 ERROR ("java plugin: strdup failed.");
1453 return (-1);
1454 }
1456 jp->class_ptr = NULL;
1457 jp->object_ptr = NULL;
1458 jp->ci = NULL;
1459 jp->flags = 0;
1460 jp->m_config = NULL;
1461 jp->m_init = NULL;
1462 jp->m_write = NULL;
1463 jp->m_shutdown = NULL;
1465 java_plugins_num++;
1467 return (0);
1468 } /* }}} int cjni_config_load_plugin */
1470 static int cjni_config_plugin_block (oconfig_item_t *ci) /* {{{ */
1471 {
1472 size_t i;
1473 const char *class_name;
1475 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
1476 {
1477 WARNING ("java plugin: `Plugin' blocks "
1478 "need exactly one string argument.");
1479 return (-1);
1480 }
1482 class_name = ci->values[0].value.string;
1483 for (i = 0; i < java_plugins_num; i++)
1484 if (strcmp (java_plugins[i].class_name, class_name) == 0)
1485 break;
1487 if (i >= java_plugins_num)
1488 {
1489 WARNING ("java plugin: Configuration block for the `%s' plugin found, "
1490 "but the plugin has not been loaded. Please note, that the class "
1491 "name is case-sensitive!",
1492 class_name);
1493 return (0);
1494 }
1496 if (java_plugins[i].ci != NULL)
1497 {
1498 WARNING ("java plugin: There are more than one <Plugin> blocks for the "
1499 "`%s' plugin. This is currently not supported - only the first block "
1500 "will be used!",
1501 class_name);
1502 return (0);
1503 }
1505 java_plugins[i].ci = oconfig_clone (ci);
1506 if (java_plugins[i].ci == NULL)
1507 {
1508 ERROR ("java plugin: cjni_config_plugin_block: "
1509 "oconfig_clone failed for `%s'.",
1510 class_name);
1511 return (-1);
1512 }
1514 DEBUG ("java plugin: cjni_config_plugin_block: "
1515 "Successfully copied config for `%s'.",
1516 class_name);
1518 return (0);
1519 } /* }}} int cjni_config_plugin_block */
1521 static int cjni_config (oconfig_item_t *ci) /* {{{ */
1522 {
1523 int success;
1524 int errors;
1525 int status;
1526 int i;
1528 success = 0;
1529 errors = 0;
1531 for (i = 0; i < ci->children_num; i++)
1532 {
1533 oconfig_item_t *child = ci->children + i;
1535 if (strcasecmp ("JVMArg", child->key) == 0)
1536 {
1537 status = cjni_config_add_jvm_arg (child);
1538 if (status == 0)
1539 success++;
1540 else
1541 errors++;
1542 }
1543 else if (strcasecmp ("LoadPlugin", child->key) == 0)
1544 {
1545 status = cjni_config_load_plugin (child);
1546 if (status == 0)
1547 success++;
1548 else
1549 errors++;
1550 }
1551 else if (strcasecmp ("Plugin", child->key) == 0)
1552 {
1553 status = cjni_config_plugin_block (child);
1554 if (status == 0)
1555 success++;
1556 else
1557 errors++;
1558 }
1559 else
1560 {
1561 WARNING ("java plugin: Option `%s' not allowed here.", child->key);
1562 errors++;
1563 }
1564 }
1566 if ((success == 0) && (errors > 0))
1567 {
1568 ERROR ("java plugin: All statements failed.");
1569 return (-1);
1570 }
1572 return (0);
1573 } /* }}} int cjni_config */
1575 static int cjni_write_one_plugin (JNIEnv *jvm_env, /* {{{ */
1576 java_plugin_t *jp, jobject vl_java)
1577 {
1578 int status;
1580 if ((jp == NULL)
1581 || ((jp->flags & CJNI_FLAG_ENABLED) == 0)
1582 || (jp->m_write == NULL))
1583 return (0);
1585 DEBUG ("java plugin: Calling: %s.Write(ValueList)", jp->class_name);
1587 status = (*jvm_env)->CallIntMethod (jvm_env, jp->object_ptr,
1588 jp->m_write, vl_java);
1589 if (status != 0)
1590 {
1591 ERROR ("java plugin: cjni_write_one_plugin: "
1592 "Calling `Write' on an `%s' object failed with status %i.",
1593 jp->class_name, status);
1594 return (-1);
1595 }
1597 return (0);
1598 } /* }}} int cjni_write_one_plugin */
1600 static int cjni_write (const data_set_t *ds, const value_list_t *vl, /* {{{ */
1601 user_data_t __attribute__((unused)) *user_data)
1602 {
1603 JNIEnv *jvm_env;
1604 java_plugin_t *jp;
1605 jobject vl_java;
1606 int status;
1608 if (jvm == NULL)
1609 {
1610 ERROR ("java plugin: cjni_write: jvm == NULL");
1611 return (-1);
1612 }
1614 if ((user_data == NULL) || (user_data->data == NULL))
1615 {
1616 ERROR ("java plugin: cjni_read: Invalid user data.");
1617 return (-1);
1618 }
1620 jvm_env = cjni_thread_attach ();
1621 if (jvm_env == NULL)
1622 return (-1);
1624 vl_java = ctoj_value_list (jvm_env, ds, vl);
1625 if (vl_java == NULL)
1626 {
1627 ERROR ("java plugin: cjni_write_plugins: ctoj_value_list failed.");
1628 return (-1);
1629 }
1631 jp = (java_plugin_t *) user_data->data;
1633 cjni_write_one_plugin (jvm_env, jp, vl_java);
1635 (*jvm_env)->DeleteLocalRef (jvm_env, vl_java);
1637 status = cjni_thread_detach ();
1638 if (status != 0)
1639 return (-1);
1641 return (0);
1642 } /* }}} int cjni_write */
1644 static int cjni_shutdown_one_plugin (JNIEnv *jvm_env, /* {{{ */
1645 java_plugin_t *jp)
1646 {
1647 int status;
1649 if ((jp == NULL)
1650 || ((jp->flags & CJNI_FLAG_ENABLED) == 0)
1651 || (jp->m_shutdown == NULL))
1652 return (0);
1654 status = (*jvm_env)->CallIntMethod (jvm_env, jp->object_ptr,
1655 jp->m_shutdown);
1656 if (status != 0)
1657 {
1658 ERROR ("cjni_shutdown_one_plugin: Destroying an `%s' object failed "
1659 "with status %i.", jp->class_name, status);
1660 return (-1);
1661 }
1662 jp->flags &= ~CJNI_FLAG_ENABLED;
1664 return (0);
1665 } /* }}} int cjni_shutdown_one_plugin */
1667 static int cjni_shutdown_plugins (JNIEnv *jvm_env) /* {{{ */
1668 {
1669 size_t j;
1671 for (j = 0; j < java_plugins_num; j++)
1672 cjni_shutdown_one_plugin (jvm_env, &java_plugins[j]);
1674 return (0);
1675 } /* }}} int cjni_shutdown_plugins */
1677 static int cjni_shutdown (void) /* {{{ */
1678 {
1679 JNIEnv *jvm_env;
1680 JavaVMAttachArgs args;
1681 int status;
1682 size_t i;
1684 if (jvm == NULL)
1685 return (0);
1687 jvm_env = NULL;
1688 memset (&args, 0, sizeof (args));
1689 args.version = JNI_VERSION_1_2;
1691 status = (*jvm)->AttachCurrentThread (jvm, (void **) &jvm_env, &args);
1692 if (status != 0)
1693 {
1694 ERROR ("java plugin: cjni_read: AttachCurrentThread failed with status %i.",
1695 status);
1696 return (-1);
1697 }
1699 cjni_shutdown_plugins (jvm_env);
1701 (*jvm)->DestroyJavaVM (jvm);
1702 jvm = NULL;
1703 jvm_env = NULL;
1705 pthread_key_delete (jvm_env_key);
1707 for (i = 0; i < jvm_argc; i++)
1708 {
1709 sfree (jvm_argv[i]);
1710 }
1711 sfree (jvm_argv);
1712 jvm_argc = 0;
1714 for (i = 0; i < java_plugins_num; i++)
1715 {
1716 sfree (java_plugins[i].class_name);
1717 oconfig_free (java_plugins[i].ci);
1718 }
1719 sfree (java_plugins);
1720 java_plugins_num = 0;
1722 return (0);
1723 } /* }}} int cjni_shutdown */
1725 static int cjni_read (user_data_t *user_data) /* {{{ */
1726 {
1727 JNIEnv *jvm_env;
1728 cjni_callback_info_t *cbi;
1729 int status;
1731 if (jvm == NULL)
1732 {
1733 ERROR ("java plugin: cjni_read: jvm == NULL");
1734 return (-1);
1735 }
1737 if ((user_data == NULL) || (user_data->data == NULL))
1738 {
1739 ERROR ("java plugin: cjni_read: Invalid user data.");
1740 return (-1);
1741 }
1743 jvm_env = cjni_thread_attach ();
1744 if (jvm_env == NULL)
1745 return (-1);
1747 cbi = (cjni_callback_info_t *) user_data->data;
1749 status = (*jvm_env)->CallIntMethod (jvm_env, cbi->object,
1750 cbi->method);
1752 status = cjni_thread_detach ();
1753 if (status != 0)
1754 {
1755 ERROR ("java plugin: cjni_read: cjni_thread_detach failed.");
1756 return (-1);
1757 }
1759 return (status);
1760 } /* }}} int cjni_read */
1762 static int cjni_init_one_plugin (JNIEnv *jvm_env, java_plugin_t *jp) /* {{{ */
1763 {
1764 char plugin_name[128];
1765 jmethodID constructor_id;
1766 int status;
1768 jp->class_ptr = (*jvm_env)->FindClass (jvm_env, jp->class_name);
1769 if (jp->class_ptr == NULL)
1770 {
1771 ERROR ("cjni_init_one_plugin: FindClass (%s) failed.",
1772 jp->class_name);
1773 return (-1);
1774 }
1776 constructor_id = (*jvm_env)->GetMethodID (jvm_env, jp->class_ptr,
1777 "<init>", "()V");
1778 if (constructor_id == NULL)
1779 {
1780 ERROR ("cjni_init_one_plugin: Could not find the constructor for `%s'.",
1781 jp->class_name);
1782 return (-1);
1783 }
1785 jp->object_ptr = (*jvm_env)->NewObject (jvm_env, jp->class_ptr,
1786 constructor_id);
1787 if (jp->object_ptr == NULL)
1788 {
1789 ERROR ("cjni_init_one_plugin: Could create a new `%s' object.",
1790 jp->class_name);
1791 return (-1);
1792 }
1794 jp->m_config = (*jvm_env)->GetMethodID (jvm_env, jp->class_ptr,
1795 "Config", "(Lorg/collectd/api/OConfigItem;)I");
1796 DEBUG ("java plugin: cjni_init_one_plugin: "
1797 "jp->class_name = %s; jp->m_config = %p;",
1798 jp->class_name, (void *) jp->m_config);
1800 jp->m_init = (*jvm_env)->GetMethodID (jvm_env, jp->class_ptr,
1801 "Init", "()I");
1802 DEBUG ("java plugin: cjni_init_one_plugin: "
1803 "jp->class_name = %s; jp->m_init = %p;",
1804 jp->class_name, (void *) jp->m_init);
1806 jp->m_write = (*jvm_env)->GetMethodID (jvm_env, jp->class_ptr,
1807 "Write", "(Lorg/collectd/api/ValueList;)I");
1808 DEBUG ("java plugin: cjni_init_one_plugin: "
1809 "jp->class_name = %s; jp->m_write = %p;",
1810 jp->class_name, (void *) jp->m_write);
1812 jp->m_shutdown = (*jvm_env)->GetMethodID (jvm_env, jp->class_ptr,
1813 "Shutdown", "()I");
1814 DEBUG ("java plugin: cjni_init_one_plugin: "
1815 "jp->class_name = %s; jp->m_shutdown = %p;",
1816 jp->class_name, (void *) jp->m_shutdown);
1818 if (jp->ci != NULL)
1819 {
1820 if (jp->m_config == NULL)
1821 {
1822 WARNING ("java plugin: Configuration for the `%s' plugin is present, "
1823 "but plugin doesn't provide a configuration method.",
1824 jp->class_name);
1825 }
1826 else /* if (jp->m_config != NULL) */
1827 {
1828 jobject o_ocitem;
1830 o_ocitem = ctoj_oconfig_item (jvm_env, jp->ci);
1831 if (o_ocitem == NULL)
1832 {
1833 ERROR ("java plugin: Creating an OConfigItem object failed. "
1834 "Can't pass configuration information to the `%s' plugin!",
1835 jp->class_name);
1836 }
1837 else /* if (o_ocitem != NULL) */
1838 {
1839 status = (*jvm_env)->CallIntMethod (jvm_env,
1840 jp->object_ptr, jp->m_config, o_ocitem);
1841 if (status != 0)
1842 {
1843 ERROR ("java plugin: cjni_init_one_plugin: "
1844 "Configuring the `%s' object failed with status %i.",
1845 jp->class_name, status);
1846 (*jvm_env)->DeleteLocalRef (jvm_env, o_ocitem);
1847 return (-1);
1848 }
1849 (*jvm_env)->DeleteLocalRef (jvm_env, o_ocitem);
1850 } /* if (o_ocitem != NULL) */
1851 } /* if (jp->m_config != NULL) */
1852 } /* if (jp->ci != NULL) */
1854 if (jp->m_init != NULL)
1855 {
1856 status = (*jvm_env)->CallIntMethod (jvm_env, jp->object_ptr,
1857 jp->m_init);
1858 if (status != 0)
1859 {
1860 ERROR ("java plugin: cjni_init_one_plugin: "
1861 "Initializing `%s' object failed with status %i.",
1862 jp->class_name, status);
1863 return (-1);
1864 }
1865 }
1866 jp->flags |= CJNI_FLAG_ENABLED;
1868 ssnprintf (plugin_name, sizeof (plugin_name), "java:%s", jp->class_name);
1870 if (jp->m_write != NULL)
1871 {
1872 user_data_t ud;
1874 memset (&ud, 0, sizeof (ud));
1875 ud.data = jp;
1876 ud.free_func = NULL;
1878 plugin_register_write (plugin_name, cjni_write, &ud);
1879 }
1881 return (0);
1882 } /* }}} int cjni_init_one_plugin */
1884 static int cjni_init_plugins (JNIEnv *jvm_env) /* {{{ */
1885 {
1886 int have_shutdown;
1887 size_t j;
1889 have_shutdown = 0;
1891 for (j = 0; j < java_plugins_num; j++)
1892 {
1893 cjni_init_one_plugin (jvm_env, &java_plugins[j]);
1895 if (java_plugins[j].m_shutdown != NULL)
1896 have_shutdown++;
1897 }
1899 if (have_shutdown > 0)
1900 plugin_register_shutdown ("java", cjni_shutdown);
1902 return (0);
1903 } /* }}} int cjni_init_plugins */
1905 static int cjni_init_native (JNIEnv *jvm_env) /* {{{ */
1906 {
1907 jclass api_class_ptr;
1908 int status;
1910 api_class_ptr = (*jvm_env)->FindClass (jvm_env, "org.collectd.api.CollectdAPI");
1911 if (api_class_ptr == NULL)
1912 {
1913 ERROR ("cjni_init_native: Cannot find API class `org.collectd.api.CollectdAPI'.");
1914 return (-1);
1915 }
1917 status = (*jvm_env)->RegisterNatives (jvm_env, api_class_ptr,
1918 jni_api_functions, (jint) jni_api_functions_num);
1919 if (status != 0)
1920 {
1921 ERROR ("cjni_init_native: RegisterNatives failed with status %i.", status);
1922 return (-1);
1923 }
1925 return (0);
1926 } /* }}} int cjni_init_native */
1928 static int cjni_init (void) /* {{{ */
1929 {
1930 JNIEnv *jvm_env;
1931 JavaVMInitArgs vm_args;
1932 JavaVMOption vm_options[jvm_argc];
1934 int status;
1935 size_t i;
1937 if (jvm != NULL)
1938 return (0);
1940 status = pthread_key_create (&jvm_env_key, cjni_jvm_env_destroy);
1941 if (status != 0)
1942 {
1943 ERROR ("java plugin: cjni_init: pthread_key_create failed "
1944 "with status %i.", status);
1945 return (-1);
1946 }
1948 jvm_env = NULL;
1950 memset (&vm_args, 0, sizeof (vm_args));
1951 vm_args.version = JNI_VERSION_1_2;
1952 vm_args.options = vm_options;
1953 vm_args.nOptions = (jint) jvm_argc;
1955 for (i = 0; i < jvm_argc; i++)
1956 {
1957 DEBUG ("java plugin: cjni_init: jvm_argv[%zu] = %s", i, jvm_argv[i]);
1958 vm_args.options[i].optionString = jvm_argv[i];
1959 }
1960 /*
1961 vm_args.options[0].optionString = "-verbose:jni";
1962 vm_args.options[1].optionString = "-Djava.class.path=/home/octo/collectd/bindings/java";
1963 */
1965 status = JNI_CreateJavaVM (&jvm, (void **) &jvm_env, (void **) &vm_args);
1966 if (status != 0)
1967 {
1968 ERROR ("cjni_init: JNI_CreateJavaVM failed with status %i.",
1969 status);
1970 return (-1);
1971 }
1972 assert (jvm != NULL);
1973 assert (jvm_env != NULL);
1975 /* Call RegisterNatives */
1976 status = cjni_init_native (jvm_env);
1977 if (status != 0)
1978 {
1979 ERROR ("cjni_init: cjni_init_native failed.");
1980 return (-1);
1981 }
1983 cjni_init_plugins (jvm_env);
1985 return (0);
1986 } /* }}} int cjni_init */
1988 void module_register (void)
1989 {
1990 plugin_register_complex_config ("java", cjni_config);
1991 plugin_register_init ("java", cjni_init);
1992 } /* void module_register (void) */
1994 /* vim: set sw=2 sts=2 et fdm=marker : */