Add callback API

[babeltrace.git] / converter / babeltrace-lib.c

diff --git a/converter/babeltrace-lib.c b/converter/babeltrace-lib.c
index 3797508155831cf84847cd4ec2d346c94ce70f88..d078a690474e29a24c6fc5e252a80526f71dbd4a 100644 (file)
--- a/converter/babeltrace-lib.c
+++ b/converter/babeltrace-lib.c
@@ -32,6 +32,7 @@
 #include <babeltrace/types.h>
 #include <babeltrace/ctf/types.h>
 #include <babeltrace/ctf-ir/metadata.h>
+#include <stdarg.h>
 
 struct stream_saved_pos {
        /*
@@ -48,6 +49,24 @@ struct babeltrace_saved_pos {
        GArray *stream_saved_pos;       /* Contains struct stream_saved_pos */
 };
 
+struct bt_callback {
+       int prio;               /* Callback order priority. Lower first. Dynamically assigned from dependency graph. */
+       void *private_data;
+       enum bt_cb_ret (*callback)(void *private_data, void *caller_data);
+};
+
+struct bt_callback_chain {
+       GArray *callback;       /* Array of struct bt_callback, ordered by priority */
+};
+
+/*
+ * per id callbacks need to be per stream class because event ID vs
+ * event name mapping can vary from stream to stream.
+ */
+struct bt_stream_callbacks {
+       GArray *per_id_callbacks;       /* Array of struct bt_callback_chain */
+};
+
 /*
  * struct babeltrace_iter: data structure representing an iterator on a trace
  * collection.
@@ -56,8 +75,60 @@ struct babeltrace_iter {
        struct ptr_heap *stream_heap;
        struct trace_collection *tc;
        struct trace_collection_pos *end_pos;
+       GArray *callbacks;                              /* Array of struct bt_stream_hooks */
+       struct bt_callback_chain main_callbacks;        /* For all events */
+       /*
+        * Flag indicating if dependency graph needs to be recalculated.
+        * Set by babeltrace_iter_add_callback(), and checked (and
+        * cleared) by upon entry into babeltrace_iter_read_event().
+        * babeltrace_iter_read_event() is responsible for calling dep
+        * graph calculation if it sees this flag set.
+        */
+       int recalculate_dep_graph;
+       /*
+        * Array of pointers to struct bt_dependencies, for garbage
+        * collection. We're not using a linked list here because each
+        * struct bt_dependencies can belong to more than one
+        * babeltrace_iter.
+        */
+       GPtrArray *dep_gc;
 };
 
+struct bt_dependencies {
+       GArray *deps;                   /* Array of GQuarks */
+       int refcount;                   /* free when decremented to 0 */
+};
+
+static
+struct bt_dependencies *_babeltrace_dependencies_create(const char *first,
+                                                       va_list ap)
+{
+       const char *iter;
+       struct bt_dependencies *dep;
+
+       dep = g_new0(struct bt_dependencies, 1);
+       dep->refcount = 1;
+       dep->deps = g_array_new(FALSE, TRUE, sizeof(GQuark));
+       iter = first;
+       while (iter) {
+               GQuark q = g_quark_from_string(iter);
+               g_array_append_val(dep->deps, q);
+               iter = va_arg(ap, const char *);
+       }
+       return dep;
+}
+
+struct bt_dependencies *babeltrace_dependencies_create(const char *first, ...)
+{
+       va_list ap;
+       struct bt_dependencies *deps;
+
+       va_start(ap, first);
+       deps = _babeltrace_dependencies_create(first, ap);
+       va_end(ap);
+       return deps;
+}
+
 static int stream_read_event(struct ctf_file_stream *sin)
 {
        int ret;