/*
* Prototypes
*
- * Mostly functions that are needed by the Java interface functions.
+ * Mostly functions that are needed by the Java interface (``native'')
+ * functions.
*/
static void cjni_callback_info_destroy (void *arg);
+static cjni_callback_info_t *cjni_callback_info_create (JNIEnv *jvm_env,
+ jobject o_name, jobject o_callback, int type);
+static int cjni_callback_register (JNIEnv *jvm_env, jobject o_name,
+ jobject o_callback, int type);
static int cjni_read (user_data_t *user_data);
static int cjni_write (const data_set_t *ds, const value_list_t *vl,
user_data_t *ud);
return (0);
} /* }}} int ctoj_value_list_add_data_set */
+/* Convert a value_list_t (and data_set_t) to a org.collectd.api.ValueList */
static jobject ctoj_value_list (JNIEnv *jvm_env, /* {{{ */
const data_set_t *ds, const value_list_t *vl)
{
/*
* Java to C conversion functions
*/
+/* Call a `String <method> ()' method. */
static int jtoc_string (JNIEnv *jvm_env, /* {{{ */
char *buffer, size_t buffer_size,
jclass class_ptr, jobject object_ptr, const char *method_name)
return (0);
} /* }}} int jtoc_string */
+/* Call a `long <method> ()' method. */
static int jtoc_long (JNIEnv *jvm_env, /* {{{ */
jlong *ret_value,
jclass class_ptr, jobject object_ptr, const char *method_name)
return (0);
} /* }}} int jtoc_long */
+/* Call a `double <method> ()' method. */
static int jtoc_double (JNIEnv *jvm_env, /* {{{ */
jdouble *ret_value,
jclass class_ptr, jobject object_ptr, const char *method_name)
return (0);
} /* }}} int jtoc_value */
+/* Read a List<Number>, convert it to `value_t' and add it to the given
+ * `value_list_t'. */
static int jtoc_values_array (JNIEnv *jvm_env, /* {{{ */
const data_set_t *ds, value_list_t *vl,
jclass class_ptr, jobject object_ptr)
BAIL_OUT (-1);
}
- values = calloc (values_num, sizeof (value_t));
+ values = (value_t *) calloc (values_num, sizeof (value_t));
if (values == NULL)
{
ERROR ("java plugin: jtoc_values_array: calloc failed.");
return (0);
} /* }}} int jtoc_value_list */
-static cjni_callback_info_t *cjni_callback_info_create (JNIEnv *jvm_env, /* {{{ */
- jobject o_name, jobject o_callback, int type)
-{
- const char *c_name;
- cjni_callback_info_t *cbi;
- const char *method_name;
- const char *method_signature;
-
- switch (type)
- {
- case CB_TYPE_CONFIG:
- method_name = "Config";
- method_signature = "(Lorg/collectd/api/OConfigItem;)I";
- break;
-
- case CB_TYPE_INIT:
- method_name = "Init";
- method_signature = "()I";
- break;
-
- case CB_TYPE_READ:
- method_name = "Read";
- method_signature = "()I";
- break;
-
- case CB_TYPE_WRITE:
- method_name = "Write";
- method_signature = "(Lorg/collectd/api/ValueList;)I";
- break;
-
- case CB_TYPE_SHUTDOWN:
- method_name = "Shutdown";
- method_signature = "()I";
- break;
-
- default:
- ERROR ("java plugin: cjni_callback_info_create: Unknown type: %#x",
- type);
- return (NULL);
- }
-
- c_name = (*jvm_env)->GetStringUTFChars (jvm_env, o_name, 0);
- if (c_name == NULL)
- {
- ERROR ("java plugin: cjni_callback_info_create: "
- "GetStringUTFChars failed.");
- return (NULL);
- }
-
- cbi = (cjni_callback_info_t *) malloc (sizeof (*cbi));
- if (cbi == NULL)
- {
- ERROR ("java plugin: cjni_callback_info_create: malloc failed.");
- (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_name, c_name);
- return (NULL);
- }
- memset (cbi, 0, sizeof (*cbi));
- cbi->type = type;
-
- cbi->name = strdup (c_name);
- if (cbi->name == NULL)
- {
- pthread_mutex_unlock (&java_callbacks_lock);
- ERROR ("java plugin: cjni_callback_info_create: strdup failed.");
- (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_name, c_name);
- return (NULL);
- }
-
- (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_name, c_name);
-
- cbi->class = (*jvm_env)->GetObjectClass (jvm_env, o_callback);
- if (cbi->class == NULL)
- {
- ERROR ("java plugin: cjni_callback_info_create: GetObjectClass failed.");
- free (cbi);
- return (NULL);
- }
-
- cbi->object = o_callback;
-
- cbi->method = (*jvm_env)->GetMethodID (jvm_env, cbi->class,
- method_name, method_signature);
- if (cbi->method == NULL)
- {
- ERROR ("java plugin: cjni_callback_info_create: "
- "Cannot find the `%s' method with signature `%s'.",
- method_name, method_signature);
- free (cbi);
- return (NULL);
- }
-
- (*jvm_env)->NewGlobalRef (jvm_env, o_callback);
-
- return (cbi);
-} /* }}} cjni_callback_info_t cjni_callback_info_create */
-
-static int cjni_callback_register (JNIEnv *jvm_env, /* {{{ */
- jobject o_name, jobject o_callback, int type)
-{
- cjni_callback_info_t *cbi;
- cjni_callback_info_t *tmp;
-#if COLLECT_DEBUG
- const char *type_str;
-#endif
-
- cbi = cjni_callback_info_create (jvm_env, o_name, o_callback, type);
- if (cbi == NULL)
- return (-1);
-
-#if COLLECT_DEBUG
- switch (type)
- {
- case CB_TYPE_CONFIG:
- type_str = "config";
- break;
-
- case CB_TYPE_INIT:
- type_str = "init";
- break;
-
- case CB_TYPE_SHUTDOWN:
- type_str = "shutdown";
- break;
-
- default:
- type_str = "<unknown>";
- }
- DEBUG ("java plugin: Registering new %s callback: %s",
- type_str, cbi->name);
-#endif
-
- pthread_mutex_lock (&java_callbacks_lock);
-
- tmp = (cjni_callback_info_t *) realloc (java_callbacks,
- (java_callbacks_num + 1) * sizeof (*java_callbacks));
- if (tmp == NULL)
- {
- pthread_mutex_unlock (&java_callbacks_lock);
- ERROR ("java plugin: cjni_callback_register: realloc failed.");
-
- (*jvm_env)->DeleteGlobalRef (jvm_env, cbi->object);
- free (cbi);
-
- return (-1);
- }
- java_callbacks = tmp;
- java_callbacks[java_callbacks_num] = *cbi;
- java_callbacks_num++;
-
- pthread_mutex_unlock (&java_callbacks_lock);
-
- free (cbi);
- return (0);
-} /* }}} int cjni_callback_register */
-
/*
* Functions accessible from Java
*/
CB_TYPE_SHUTDOWN));
} /* }}} jint cjni_api_register_shutdown */
+/* List of ``native'' functions, i. e. C-functions that can be called from
+ * Java. */
static JNINativeMethod jni_api_functions[] = /* {{{ */
{
{ "DispatchValues",
/*
* Functions
*/
+/* Allocate a `cjni_callback_info_t' given the type and objects necessary for
+ * all registration functions. */
+static cjni_callback_info_t *cjni_callback_info_create (JNIEnv *jvm_env, /* {{{ */
+ jobject o_name, jobject o_callback, int type)
+{
+ const char *c_name;
+ cjni_callback_info_t *cbi;
+ const char *method_name;
+ const char *method_signature;
+
+ switch (type)
+ {
+ case CB_TYPE_CONFIG:
+ method_name = "Config";
+ method_signature = "(Lorg/collectd/api/OConfigItem;)I";
+ break;
+
+ case CB_TYPE_INIT:
+ method_name = "Init";
+ method_signature = "()I";
+ break;
+
+ case CB_TYPE_READ:
+ method_name = "Read";
+ method_signature = "()I";
+ break;
+
+ case CB_TYPE_WRITE:
+ method_name = "Write";
+ method_signature = "(Lorg/collectd/api/ValueList;)I";
+ break;
+
+ case CB_TYPE_SHUTDOWN:
+ method_name = "Shutdown";
+ method_signature = "()I";
+ break;
+
+ default:
+ ERROR ("java plugin: cjni_callback_info_create: Unknown type: %#x",
+ type);
+ return (NULL);
+ }
+
+ c_name = (*jvm_env)->GetStringUTFChars (jvm_env, o_name, 0);
+ if (c_name == NULL)
+ {
+ ERROR ("java plugin: cjni_callback_info_create: "
+ "GetStringUTFChars failed.");
+ return (NULL);
+ }
+
+ cbi = (cjni_callback_info_t *) malloc (sizeof (*cbi));
+ if (cbi == NULL)
+ {
+ ERROR ("java plugin: cjni_callback_info_create: malloc failed.");
+ (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_name, c_name);
+ return (NULL);
+ }
+ memset (cbi, 0, sizeof (*cbi));
+ cbi->type = type;
+
+ cbi->name = strdup (c_name);
+ if (cbi->name == NULL)
+ {
+ pthread_mutex_unlock (&java_callbacks_lock);
+ ERROR ("java plugin: cjni_callback_info_create: strdup failed.");
+ (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_name, c_name);
+ return (NULL);
+ }
+
+ (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_name, c_name);
+
+ cbi->class = (*jvm_env)->GetObjectClass (jvm_env, o_callback);
+ if (cbi->class == NULL)
+ {
+ ERROR ("java plugin: cjni_callback_info_create: GetObjectClass failed.");
+ free (cbi);
+ return (NULL);
+ }
+
+ cbi->object = o_callback;
+
+ cbi->method = (*jvm_env)->GetMethodID (jvm_env, cbi->class,
+ method_name, method_signature);
+ if (cbi->method == NULL)
+ {
+ ERROR ("java plugin: cjni_callback_info_create: "
+ "Cannot find the `%s' method with signature `%s'.",
+ method_name, method_signature);
+ free (cbi);
+ return (NULL);
+ }
+
+ (*jvm_env)->NewGlobalRef (jvm_env, o_callback);
+
+ return (cbi);
+} /* }}} cjni_callback_info_t cjni_callback_info_create */
+
+/* Allocate a `cjni_callback_info_t' via `cjni_callback_info_create' and add it
+ * to the global `java_callbacks' variable. This is used for `config', `init',
+ * and `shutdown' callbacks. */
+static int cjni_callback_register (JNIEnv *jvm_env, /* {{{ */
+ jobject o_name, jobject o_callback, int type)
+{
+ cjni_callback_info_t *cbi;
+ cjni_callback_info_t *tmp;
+#if COLLECT_DEBUG
+ const char *type_str;
+#endif
+
+ cbi = cjni_callback_info_create (jvm_env, o_name, o_callback, type);
+ if (cbi == NULL)
+ return (-1);
+
+#if COLLECT_DEBUG
+ switch (type)
+ {
+ case CB_TYPE_CONFIG:
+ type_str = "config";
+ break;
+
+ case CB_TYPE_INIT:
+ type_str = "init";
+ break;
+
+ case CB_TYPE_SHUTDOWN:
+ type_str = "shutdown";
+ break;
+
+ default:
+ type_str = "<unknown>";
+ }
+ DEBUG ("java plugin: Registering new %s callback: %s",
+ type_str, cbi->name);
+#endif
+
+ pthread_mutex_lock (&java_callbacks_lock);
+
+ tmp = (cjni_callback_info_t *) realloc (java_callbacks,
+ (java_callbacks_num + 1) * sizeof (*java_callbacks));
+ if (tmp == NULL)
+ {
+ pthread_mutex_unlock (&java_callbacks_lock);
+ ERROR ("java plugin: cjni_callback_register: realloc failed.");
+
+ (*jvm_env)->DeleteGlobalRef (jvm_env, cbi->object);
+ free (cbi);
+
+ return (-1);
+ }
+ java_callbacks = tmp;
+ java_callbacks[java_callbacks_num] = *cbi;
+ java_callbacks_num++;
+
+ pthread_mutex_unlock (&java_callbacks_lock);
+
+ free (cbi);
+ return (0);
+} /* }}} int cjni_callback_register */
+
+/* Increase the reference counter to the JVM for this thread. If it was zero,
+ * attach the JVM first. */
static JNIEnv *cjni_thread_attach (void) /* {{{ */
{
cjni_jvm_env_t *cjni_env;
return (jvm_env);
} /* }}} JNIEnv *cjni_thread_attach */
+/* Decrease the reference counter of this thread. If it reaches zero, detach
+ * from the JVM. */
static int cjni_thread_detach (void) /* {{{ */
{
cjni_jvm_env_t *cjni_env;
return (0);
} /* }}} JNIEnv *cjni_thread_attach */
+/* Callback for `pthread_key_create'. It frees the data contained in
+ * `jvm_env_key' and prints a warning if the reference counter is not zero. */
static void cjni_jvm_env_destroy (void *args) /* {{{ */
{
cjni_jvm_env_t *cjni_env;
free (cjni_env);
} /* }}} void cjni_jvm_env_destroy */
-/*
- * Delete a global reference, set by the various `Register*' functions.
- */
-static void cjni_callback_info_destroy (void *arg) /* {{{ */
-{
- JNIEnv *jvm_env;
- cjni_callback_info_t *cbi;
-
- DEBUG ("java plugin: cjni_callback_info_destroy (arg = %p);", arg);
-
- if (arg == NULL)
- return;
-
- jvm_env = cjni_thread_attach ();
- if (jvm_env == NULL)
- {
- ERROR ("java plugin: cjni_callback_info_destroy: cjni_thread_attach failed.");
- return;
- }
-
- cbi = (cjni_callback_info_t *) arg;
-
- (*jvm_env)->DeleteGlobalRef (jvm_env, cbi->object);
-
- cbi->method = NULL;
- cbi->object = NULL;
- cbi->class = NULL;
- free (cbi);
-
- cjni_thread_detach ();
-} /* }}} void cjni_callback_info_destroy */
-
+/* Boring configuration functions.. {{{ */
static int cjni_config_add_jvm_arg (oconfig_item_t *ci) /* {{{ */
{
char **tmp;
return (0);
} /* }}} int cjni_config */
+/* }}} */
+
+/* Free the data contained in the `user_data_t' pointer passed to `cjni_read'
+ * and `cjni_write'. In particular, delete the global reference to the Java
+ * object. */
+static void cjni_callback_info_destroy (void *arg) /* {{{ */
+{
+ JNIEnv *jvm_env;
+ cjni_callback_info_t *cbi;
+
+ DEBUG ("java plugin: cjni_callback_info_destroy (arg = %p);", arg);
+ if (arg == NULL)
+ return;
+
+ jvm_env = cjni_thread_attach ();
+ if (jvm_env == NULL)
+ {
+ ERROR ("java plugin: cjni_callback_info_destroy: cjni_thread_attach failed.");
+ return;
+ }
+
+ cbi = (cjni_callback_info_t *) arg;
+
+ (*jvm_env)->DeleteGlobalRef (jvm_env, cbi->object);
+
+ cbi->method = NULL;
+ cbi->object = NULL;
+ cbi->class = NULL;
+ free (cbi);
+
+ cjni_thread_detach ();
+} /* }}} void cjni_callback_info_destroy */
+
+/* Call the CB_TYPE_READ callback pointed to by the `user_data_t' pointer. */
static int cjni_read (user_data_t *ud) /* {{{ */
{
JNIEnv *jvm_env;
return (status);
} /* }}} int cjni_read */
+/* Call the CB_TYPE_WRITE callback pointed to by the `user_data_t' pointer. */
static int cjni_write (const data_set_t *ds, const value_list_t *vl, /* {{{ */
user_data_t *ud)
{
return (status);
} /* }}} int cjni_write */
-
+/* Iterate over `java_classes_list' and create one object of each class. This
+ * will trigger the object's constructors, to the objects can register callback
+ * methods. */
static int cjni_load_plugins (JNIEnv *jvm_env) /* {{{ */
{
size_t i;
return (0);
} /* }}} int cjni_load_plugins */
+/* Iterate over `java_plugin_configs' and `java_callbacks' and call all
+ * `config' callback methods for which a configuration is available. */
static int cjni_config_plugins (JNIEnv *jvm_env) /* {{{ */
{
int status;
return (0);
} /* }}} int cjni_config_plugins */
+/* Iterate over `java_callbacks' and call all CB_TYPE_INIT callbacks. */
static int cjni_init_plugins (JNIEnv *jvm_env) /* {{{ */
{
int status;
return (0);
} /* }}} int cjni_init_plugins */
+/* Iterate over `java_callbacks' and call all CB_TYPE_SHUTDOWN callbacks. */
static int cjni_shutdown_plugins (JNIEnv *jvm_env) /* {{{ */
{
int status;
return (0);
} /* }}} int cjni_shutdown */
+/* Register ``native'' functions with the JVM. Native functions are C-functions
+ * that can be called by Java code. */
static int cjni_init_native (JNIEnv *jvm_env) /* {{{ */
{
jclass api_class_ptr;
return (0);
} /* }}} int cjni_init_native */
+/* Initialization: Create a JVM, load all configured classes and call their
+ * `config' and `init' callback methods. */
static int cjni_init (void) /* {{{ */
{
JNIEnv *jvm_env;
projects / collectd.git / commitdiff