Implement trace listener interface

[babeltrace.git] / formats / ctf / ir / trace.c

diff --git a/formats/ctf/ir/trace.c b/formats/ctf/ir/trace.c
index c4889b79b44fb2f4ef318f387434bfad800ca79f..8ead3792785c82355b41fcf59d801dfed15b13c6 100644 (file)
--- a/formats/ctf/ir/trace.c
+++ b/formats/ctf/ir/trace.c
@@ -37,7 +37,9 @@
 #include <babeltrace/ctf-ir/field-types-internal.h>
 #include <babeltrace/ctf-ir/attributes-internal.h>
 #include <babeltrace/ctf-ir/validation-internal.h>
+#include <babeltrace/ctf-ir/visitor-internal.h>
 #include <babeltrace/ctf-ir/utils.h>
+#include <babeltrace/plugin/notification/schema.h>
 #include <babeltrace/compiler.h>
 #include <babeltrace/values.h>
 #include <babeltrace/ref.h>
@@ -46,8 +48,8 @@
 #define DEFAULT_IDENTIFIER_SIZE 128
 #define DEFAULT_METADATA_STRING_SIZE 4096
 
-struct notification_handler {
-       bt_ctf_notification_cb func;
+struct listener_wrapper {
+       bt_ctf_listener_cb listener;
        void *data;
 };
 
@@ -109,6 +111,12 @@ struct bt_ctf_trace *bt_ctf_trace_create(void)
                goto error;
        }
 
+       trace->listeners = g_ptr_array_new_with_free_func(
+                       (GDestroyNotify) g_free);
+       if (!trace->listeners) {
+               goto error;
+       }
+
        return trace;
 
 error:
@@ -137,6 +145,10 @@ void bt_ctf_trace_destroy(struct bt_object *obj)
                g_ptr_array_free(trace->stream_classes, TRUE);
        }
 
+       if (trace->listeners) {
+               g_ptr_array_free(trace->listeners, TRUE);
+       }
+
        bt_put(trace->packet_header_type);
        g_free(trace);
 }
@@ -638,6 +650,9 @@ int bt_ctf_trace_add_stream_class(struct bt_ctf_trace *trace,
        bt_ctf_stream_class_freeze(stream_class);
        bt_ctf_trace_freeze(trace);
 
+       /* Notifiy listeners of the trace's schema modification. */
+       bt_ctf_stream_class_visit(stream_class,
+                       bt_ctf_trace_element_modification, trace);
 end:
        if (ret) {
                bt_object_set_parent(stream_class, NULL);
@@ -1032,27 +1047,109 @@ end:
        return ret;
 }
 
-int bt_ctf_trace_add_notification_handler_cb(struct bt_ctf_trace *trace,
-               bt_ctf_notification_cb handler, void *handler_data)
+static
+int get_stream_class_count(void *element)
+{
+       return bt_ctf_trace_get_stream_class_count(
+                       (struct bt_ctf_trace *) element);
+}
+
+static
+void *get_stream_class(void *element, int i)
+{
+       return bt_ctf_trace_get_stream_class(
+                       (struct bt_ctf_trace *) element, i);
+}
+
+static
+int visit_stream_class(void *element, bt_ctf_ir_visitor visitor,void *data)
+{
+       return bt_ctf_stream_class_visit(element, visitor, data);
+}
+
+int bt_ctf_trace_visit(struct bt_ctf_trace *trace,
+               bt_ctf_ir_visitor visitor, void *data)
+{
+       int ret;
+       struct bt_ctf_ir_element element =
+                       { .element = trace, .type = BT_CTF_IR_TYPE_TRACE };
+
+       if (!trace || !visitor) {
+               ret = -1;
+               goto end;
+       }
+
+       ret = visitor_helper(&element, get_stream_class_count,
+                       get_stream_class, visit_stream_class, visitor, data);
+end:
+       return ret;
+}
+
+static
+int invoke_listener(struct bt_ctf_ir_element *element, void *data)
+{
+       struct listener_wrapper *listener_wrapper = data;
+
+       listener_wrapper->listener(element, listener_wrapper->data);
+       return 0;
+}
+
+int bt_ctf_trace_add_listener(struct bt_ctf_trace *trace,
+               bt_ctf_listener_cb listener, void *listener_data)
 {
        int ret = 0;
-       struct notification_handler *handler_wrapper =
-                       g_new0(struct notification_handler, 1);
+       struct listener_wrapper *listener_wrapper =
+                       g_new0(struct listener_wrapper, 1);
 
-       if (!trace || !handler || !handler_wrapper) {
+       if (!trace || !listener || !listener_wrapper) {
                ret = -1;
                goto error;
        }
 
-       handler_wrapper->func = handler;
-       handler_wrapper->data = handler_data;
-       g_ptr_array_add(trace->notification_handlers, handler_wrapper);
+       listener_wrapper->listener = listener;
+       listener_wrapper->data = listener_data;
+
+       /* Visit the current schema. */
+       ret = bt_ctf_trace_visit(trace, invoke_listener, listener_wrapper);
+       if (ret) {
+               goto error;
+       }
+
+       /*
+        * Add listener to the array of callbacks which will be invoked on
+        * schema changes.
+        */
+       g_ptr_array_add(trace->listeners, listener_wrapper);
        return ret;
 error:
-       g_free(handler_wrapper);
+       g_free(listener_wrapper);
        return ret;
 }
 
+BT_HIDDEN
+int bt_ctf_trace_element_modification(struct bt_ctf_ir_element *element,
+               void *trace_ptr)
+{
+       size_t i;
+       struct bt_ctf_trace *trace = trace_ptr;
+
+       assert(trace);
+       assert(element);
+
+       if (trace->listeners->len == 0) {
+               goto end;
+       }
+
+       for (i = 0; i < trace->listeners->len; i++) {
+               struct listener_wrapper *listener =
+                               g_ptr_array_index(trace->listeners, i);
+
+               listener->listener(element, listener->data);
+       }
+end:
+       return 0;
+}
+
 BT_HIDDEN
 struct bt_ctf_field_type *get_field_type(enum field_type_alias alias)
 {