/*
* 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 */
+/*
+ * Functions accessible from Java
+ */
+static jint JNICALL cjni_api_dispatch_values (JNIEnv *jvm_env, /* {{{ */
+ jobject this, jobject java_vl)
+{
+ value_list_t vl = VALUE_LIST_INIT;
+ int status;
+
+ DEBUG ("cjni_api_dispatch_values: java_vl = %p;", (void *) java_vl);
+
+ status = jtoc_value_list (jvm_env, &vl, java_vl);
+ if (status != 0)
+ {
+ ERROR ("java plugin: cjni_api_dispatch_values: jtoc_value_list failed.");
+ return (-1);
+ }
+
+ status = plugin_dispatch_values (&vl);
+
+ sfree (vl.values);
+
+ return (status);
+} /* }}} jint cjni_api_dispatch_values */
+
+static jobject JNICALL cjni_api_get_ds (JNIEnv *jvm_env, /* {{{ */
+ jobject this, jobject o_string_type)
+{
+ const char *ds_name;
+ const data_set_t *ds;
+ jobject o_dataset;
+
+ ds_name = (*jvm_env)->GetStringUTFChars (jvm_env, o_string_type, 0);
+ if (ds_name == NULL)
+ {
+ ERROR ("java plugin: cjni_api_get_ds: GetStringUTFChars failed.");
+ return (NULL);
+ }
+
+ ds = plugin_get_ds (ds_name);
+ DEBUG ("java plugin: cjni_api_get_ds: "
+ "plugin_get_ds (%s) = %p;", ds_name, (void *) ds);
+
+ (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_string_type, ds_name);
+
+ if (ds == NULL)
+ return (NULL);
+
+ o_dataset = ctoj_data_set (jvm_env, ds);
+ return (o_dataset);
+} /* }}} jint cjni_api_get_ds */
+
+static jint JNICALL cjni_api_register_config (JNIEnv *jvm_env, /* {{{ */
+ jobject this, jobject o_name, jobject o_config)
+{
+ return (cjni_callback_register (jvm_env, o_name, o_config, CB_TYPE_CONFIG));
+} /* }}} jint cjni_api_register_config */
+
+static jint JNICALL cjni_api_register_init (JNIEnv *jvm_env, /* {{{ */
+ jobject this, jobject o_name, jobject o_config)
+{
+ return (cjni_callback_register (jvm_env, o_name, o_config, CB_TYPE_INIT));
+} /* }}} jint cjni_api_register_init */
+
+static jint JNICALL cjni_api_register_read (JNIEnv *jvm_env, /* {{{ */
+ jobject this, jobject o_name, jobject o_read)
+{
+ user_data_t ud;
+ cjni_callback_info_t *cbi;
+
+ cbi = cjni_callback_info_create (jvm_env, o_name, o_read, CB_TYPE_READ);
+ if (cbi == NULL)
+ return (-1);
+
+ DEBUG ("java plugin: Registering new read callback: %s", cbi->name);
+
+ memset (&ud, 0, sizeof (ud));
+ ud.data = (void *) cbi;
+ ud.free_func = cjni_callback_info_destroy;
+
+ plugin_register_complex_read (cbi->name, cjni_read, &ud);
+
+ (*jvm_env)->DeleteLocalRef (jvm_env, o_read);
+
+ return (0);
+} /* }}} jint cjni_api_register_read */
+
+static jint JNICALL cjni_api_register_write (JNIEnv *jvm_env, /* {{{ */
+ jobject this, jobject o_name, jobject o_write)
+{
+ user_data_t ud;
+ cjni_callback_info_t *cbi;
+
+ cbi = cjni_callback_info_create (jvm_env, o_name, o_write, CB_TYPE_WRITE);
+ if (cbi == NULL)
+ return (-1);
+
+ DEBUG ("java plugin: Registering new write callback: %s", cbi->name);
+
+ memset (&ud, 0, sizeof (ud));
+ ud.data = (void *) cbi;
+ ud.free_func = cjni_callback_info_destroy;
+
+ plugin_register_write (cbi->name, cjni_write, &ud);
+
+ (*jvm_env)->DeleteLocalRef (jvm_env, o_write);
+
+ return (0);
+} /* }}} jint cjni_api_register_write */
+
+static jint JNICALL cjni_api_register_shutdown (JNIEnv *jvm_env, /* {{{ */
+ jobject this, jobject o_name, jobject o_shutdown)
+{
+ return (cjni_callback_register (jvm_env, o_name, o_shutdown,
+ CB_TYPE_SHUTDOWN));
+} /* }}} jint cjni_api_register_shutdown */
+
+static void JNICALL cjni_api_log (JNIEnv *jvm_env, /* {{{ */
+ jobject this, jint severity, jobject o_message)
+{
+ const char *c_str;
+
+ c_str = (*jvm_env)->GetStringUTFChars (jvm_env, o_message, 0);
+ if (c_str == NULL)
+ {
+ ERROR ("java plugin: cjni_api_log: GetStringUTFChars failed.");
+ return;
+ }
+
+ if (severity < LOG_ERR)
+ severity = LOG_ERR;
+ if (severity > LOG_DEBUG)
+ severity = LOG_DEBUG;
+
+ plugin_log (severity, "%s", c_str);
+
+ (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_message, c_str);
+} /* }}} void cjni_api_log */
+
+/* List of ``native'' functions, i. e. C-functions that can be called from
+ * Java. */
+static JNINativeMethod jni_api_functions[] = /* {{{ */
+{
+ { "dispatchValues",
+ "(Lorg/collectd/api/ValueList;)I",
+ cjni_api_dispatch_values },
+
+ { "getDS",
+ "(Ljava/lang/String;)Lorg/collectd/api/DataSet;",
+ cjni_api_get_ds },
+
+ { "registerConfig",
+ "(Ljava/lang/String;Lorg/collectd/api/CollectdConfigInterface;)I",
+ cjni_api_register_config },
+
+ { "registerInit",
+ "(Ljava/lang/String;Lorg/collectd/api/CollectdInitInterface;)I",
+ cjni_api_register_init },
+
+ { "registerRead",
+ "(Ljava/lang/String;Lorg/collectd/api/CollectdReadInterface;)I",
+ cjni_api_register_read },
+
+ { "registerWrite",
+ "(Ljava/lang/String;Lorg/collectd/api/CollectdWriteInterface;)I",
+ cjni_api_register_write },
+
+ { "registerShutdown",
+ "(Ljava/lang/String;Lorg/collectd/api/CollectdShutdownInterface;)I",
+ cjni_api_register_shutdown },
+
+ { "log",
+ "(ILjava/lang/String;)V",
+ cjni_api_log },
+};
+static size_t jni_api_functions_num = sizeof (jni_api_functions)
+ / sizeof (jni_api_functions[0]);
+/* }}} */
+
+/*
+ * 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)
{
switch (type)
{
case CB_TYPE_CONFIG:
- method_name = "Config";
+ method_name = "config";
method_signature = "(Lorg/collectd/api/OConfigItem;)I";
break;
case CB_TYPE_INIT:
- method_name = "Init";
+ method_name = "init";
method_signature = "()I";
break;
case CB_TYPE_READ:
- method_name = "Read";
+ method_name = "read";
method_signature = "()I";
break;
case CB_TYPE_WRITE:
- method_name = "Write";
+ method_name = "write";
method_signature = "(Lorg/collectd/api/ValueList;)I";
break;
case CB_TYPE_SHUTDOWN:
- method_name = "Shutdown";
+ method_name = "shutdown";
method_signature = "()I";
break;
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)
{
return (0);
} /* }}} int cjni_callback_register */
-/*
- * Functions accessible from Java
- */
-static jint JNICALL cjni_api_dispatch_values (JNIEnv *jvm_env, /* {{{ */
- jobject this, jobject java_vl)
-{
- value_list_t vl = VALUE_LIST_INIT;
- int status;
-
- DEBUG ("cjni_api_dispatch_values: java_vl = %p;", (void *) java_vl);
-
- status = jtoc_value_list (jvm_env, &vl, java_vl);
- if (status != 0)
- {
- ERROR ("java plugin: cjni_api_dispatch_values: jtoc_value_list failed.");
- return (-1);
- }
-
- status = plugin_dispatch_values (&vl);
-
- sfree (vl.values);
-
- return (status);
-} /* }}} jint cjni_api_dispatch_values */
-
-static jobject JNICALL cjni_api_get_ds (JNIEnv *jvm_env, /* {{{ */
- jobject this, jobject o_string_type)
-{
- const char *ds_name;
- const data_set_t *ds;
- jobject o_dataset;
-
- ds_name = (*jvm_env)->GetStringUTFChars (jvm_env, o_string_type, 0);
- if (ds_name == NULL)
- {
- ERROR ("java plugin: cjni_api_get_ds: GetStringUTFChars failed.");
- return (NULL);
- }
-
- ds = plugin_get_ds (ds_name);
- DEBUG ("java plugin: cjni_api_get_ds: "
- "plugin_get_ds (%s) = %p;", ds_name, (void *) ds);
-
- (*jvm_env)->ReleaseStringUTFChars (jvm_env, o_string_type, ds_name);
-
- if (ds == NULL)
- return (NULL);
-
- o_dataset = ctoj_data_set (jvm_env, ds);
- return (o_dataset);
-} /* }}} jint cjni_api_get_ds */
-
-static jint JNICALL cjni_api_register_config (JNIEnv *jvm_env, /* {{{ */
- jobject this, jobject o_name, jobject o_config)
-{
- return (cjni_callback_register (jvm_env, o_name, o_config, CB_TYPE_CONFIG));
-} /* }}} jint cjni_api_register_config */
-
-static jint JNICALL cjni_api_register_init (JNIEnv *jvm_env, /* {{{ */
- jobject this, jobject o_name, jobject o_config)
-{
- return (cjni_callback_register (jvm_env, o_name, o_config, CB_TYPE_INIT));
-} /* }}} jint cjni_api_register_init */
-
-static jint JNICALL cjni_api_register_read (JNIEnv *jvm_env, /* {{{ */
- jobject this, jobject o_name, jobject o_read)
-{
- user_data_t ud;
- cjni_callback_info_t *cbi;
-
- cbi = cjni_callback_info_create (jvm_env, o_name, o_read, CB_TYPE_READ);
- if (cbi == NULL)
- return (-1);
-
- DEBUG ("java plugin: Registering new read callback: %s", cbi->name);
-
- memset (&ud, 0, sizeof (ud));
- ud.data = (void *) cbi;
- ud.free_func = cjni_callback_info_destroy;
-
- plugin_register_complex_read (cbi->name, cjni_read, &ud);
-
- (*jvm_env)->DeleteLocalRef (jvm_env, o_read);
-
- return (0);
-} /* }}} jint cjni_api_register_read */
-
-static jint JNICALL cjni_api_register_write (JNIEnv *jvm_env, /* {{{ */
- jobject this, jobject o_name, jobject o_write)
-{
- user_data_t ud;
- cjni_callback_info_t *cbi;
-
- cbi = cjni_callback_info_create (jvm_env, o_name, o_write, CB_TYPE_WRITE);
- if (cbi == NULL)
- return (-1);
-
- DEBUG ("java plugin: Registering new write callback: %s", cbi->name);
-
- memset (&ud, 0, sizeof (ud));
- ud.data = (void *) cbi;
- ud.free_func = cjni_callback_info_destroy;
-
- plugin_register_write (cbi->name, cjni_write, &ud);
-
- (*jvm_env)->DeleteLocalRef (jvm_env, o_write);
-
- return (0);
-} /* }}} jint cjni_api_register_write */
-
-static jint JNICALL cjni_api_register_shutdown (JNIEnv *jvm_env, /* {{{ */
- jobject this, jobject o_name, jobject o_shutdown)
-{
- return (cjni_callback_register (jvm_env, o_name, o_shutdown,
- CB_TYPE_SHUTDOWN));
-} /* }}} jint cjni_api_register_shutdown */
-
-static JNINativeMethod jni_api_functions[] = /* {{{ */
-{
- { "DispatchValues",
- "(Lorg/collectd/api/ValueList;)I",
- cjni_api_dispatch_values },
-
- { "GetDS",
- "(Ljava/lang/String;)Lorg/collectd/api/DataSet;",
- cjni_api_get_ds },
-
- { "RegisterConfig",
- "(Ljava/lang/String;Lorg/collectd/api/CollectdConfigInterface;)I",
- cjni_api_register_config },
-
- { "RegisterInit",
- "(Ljava/lang/String;Lorg/collectd/api/CollectdInitInterface;)I",
- cjni_api_register_init },
-
- { "RegisterRead",
- "(Ljava/lang/String;Lorg/collectd/api/CollectdReadInterface;)I",
- cjni_api_register_read },
-
- { "RegisterWrite",
- "(Ljava/lang/String;Lorg/collectd/api/CollectdWriteInterface;)I",
- cjni_api_register_write },
-
- { "RegisterShutdown",
- "(Ljava/lang/String;Lorg/collectd/api/CollectdShutdownInterface;)I",
- cjni_api_register_shutdown }
-
-};
-static size_t jni_api_functions_num = sizeof (jni_api_functions)
- / sizeof (jni_api_functions[0]);
-/* }}} */
-
-/*
- * Functions
- */
+/* 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;
int status;
- api_class_ptr = (*jvm_env)->FindClass (jvm_env, "org.collectd.api.CollectdAPI");
+ api_class_ptr = (*jvm_env)->FindClass (jvm_env, "org.collectd.api.Collectd");
if (api_class_ptr == NULL)
{
- ERROR ("cjni_init_native: Cannot find API class `org.collectd.api.CollectdAPI'.");
+ ERROR ("cjni_init_native: Cannot find API class `org.collectd.api.Collectd'.");
return (-1);
}
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 / blobdiff