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authorFederico Mena Quintero <federico@ximian.com>2001-08-29 11:15:54 +0800
committerFederico Mena Quintero <federico@src.gnome.org>2001-08-29 11:15:54 +0800
commitf6ee20d9097f3ba7bce189f3015e65721d328122 (patch)
tree11b2b4202964d1bc6256a089de5ee4c31aff0e2e /calendar/pcs/query.c
parent572e5648458cab1d530f1cb219efafc853030ba0 (diff)
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Fixes bug #7879, a query may receive an update notification from the
2001-08-28 Federico Mena Quintero <federico@ximian.com> Fixes bug #7879, a query may receive an update notification from the backend before the query itself gets populated. * pcs/query.c (ensure_sexp): New function; ensures that the esexp is created and notifies of parse errors. It is the bulk of start_query_cb() but put in a separate function so that we can share it elsewhere. (start_query_cb): Use ensure_sexp(). (process_component_cb): Oops, notify of a successfully finished query. (match_component): Call ensure_sexp(). This function can be called by the backend notification callbacks before the query is populated, so we need to make sure the esexp exists here. svn path=/trunk/; revision=12509
Diffstat (limited to 'calendar/pcs/query.c')
-rw-r--r--calendar/pcs/query.c126
1 files changed, 98 insertions, 28 deletions
diff --git a/calendar/pcs/query.c b/calendar/pcs/query.c
index ae76ec9795..1b991a85ea 100644
--- a/calendar/pcs/query.c
+++ b/calendar/pcs/query.c
@@ -36,6 +36,14 @@
+/* States of a query */
+typedef enum {
+ QUERY_START_PENDING, /* the query is not populated yet */
+ QUERY_IN_PROGRESS, /* the query is populated; components are still being processed */
+ QUERY_DONE, /* the query is done, but still accepts object changes */
+ QUERY_PARSE_ERROR /* a parse error occurred when initially creating the ESexp */
+} QueryState;
+
/* Private part of the Query structure */
struct _QueryPrivate {
/* The backend we are monitoring */
@@ -48,8 +56,9 @@ struct _QueryPrivate {
char *sexp;
ESExp *esexp;
- /* Idle handler ID for asynchronous queries */
+ /* Idle handler ID for asynchronous queries and the current state */
guint idle_id;
+ QueryState state;
/* List of UIDs that we still have to process */
GList *pending_uids;
@@ -110,6 +119,9 @@ query_init (Query *query)
priv->ql = CORBA_OBJECT_NIL;
priv->sexp = NULL;
+ priv->idle_id = 0;
+ priv->state = QUERY_START_PENDING;
+
priv->pending_uids = NULL;
priv->uids = g_hash_table_new (g_str_hash, g_str_equal);
@@ -954,6 +966,66 @@ create_sexp (Query *query)
return esexp;
}
+/* Ensures that the sexp has been parsed and the ESexp has been created. If a
+ * parse error occurs, it sets the query state to QUERY_PARSE_ERROR and returns
+ * FALSE.
+ */
+static gboolean
+ensure_sexp (Query *query)
+{
+ QueryPrivate *priv;
+
+ priv = query->priv;
+
+ if (priv->state == QUERY_PARSE_ERROR)
+ g_assert_not_reached (); /* we should already have terminated everything */
+
+ if (priv->esexp)
+ return TRUE;
+
+ /* Compile the query string */
+
+ priv->esexp = create_sexp (query);
+
+ g_assert (priv->sexp != NULL);
+ e_sexp_input_text (priv->esexp, priv->sexp, strlen (priv->sexp));
+
+ if (e_sexp_parse (priv->esexp) == -1) {
+ const char *error_str;
+ CORBA_Environment ev;
+
+ /* Change the state and disconnect from any notifications */
+
+ priv->state = QUERY_PARSE_ERROR;
+ gtk_signal_disconnect_by_data (GTK_OBJECT (priv->backend), query);
+
+ /* Report the error to the listener */
+
+ error_str = e_sexp_error (priv->esexp);
+ g_assert (error_str != NULL);
+
+ CORBA_exception_init (&ev);
+ GNOME_Evolution_Calendar_QueryListener_notifyQueryDone (
+ priv->ql,
+ GNOME_Evolution_Calendar_QueryListener_PARSE_ERROR,
+ error_str,
+ &ev);
+
+ if (ev._major != CORBA_NO_EXCEPTION)
+ g_message ("ensure_sexp(): Could not notify the listener of "
+ "a parse error");
+
+ CORBA_exception_free (&ev);
+
+ e_sexp_unref (priv->esexp);
+ priv->esexp = NULL;
+
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
/* Evaluates the query sexp on the specified component and notifies the listener
* as appropriate.
*/
@@ -967,6 +1039,11 @@ match_component (Query *query, const char *uid,
priv = query->priv;
+ g_assert (priv->state != QUERY_PARSE_ERROR);
+
+ if (!ensure_sexp (query))
+ return;
+
comp = cal_backend_get_object_component (priv->backend, uid);
g_assert (comp != NULL);
gtk_object_ref (GTK_OBJECT (comp));
@@ -1041,9 +1118,26 @@ process_component_cb (gpointer data)
/* No more components? */
if (!priv->pending_uids) {
+ CORBA_Environment ev;
+
g_assert (priv->n_pending == 0);
priv->idle_id = 0;
+ priv->state = QUERY_DONE;
+
+ CORBA_exception_init (&ev);
+ GNOME_Evolution_Calendar_QueryListener_notifyQueryDone (
+ priv->ql,
+ GNOME_Evolution_Calendar_QueryListener_SUCCESS,
+ "",
+ &ev);
+
+ if (ev._major != CORBA_NO_EXCEPTION)
+ g_message ("process_component_cb(): Could not notify the listener of "
+ "a finished query");
+
+ CORBA_exception_free (&ev);
+
return FALSE;
}
@@ -1087,12 +1181,14 @@ populate_query (Query *query)
priv = query->priv;
g_assert (priv->idle_id == 0);
+ g_assert (priv->state == QUERY_START_PENDING);
priv->pending_uids = cal_backend_get_uids (priv->backend, CALOBJ_TYPE_ANY);
priv->pending_total = g_list_length (priv->pending_uids);
priv->n_pending = priv->pending_total;
priv->idle_id = g_idle_add (process_component_cb, query);
+ priv->state = QUERY_IN_PROGRESS;
}
/* Idle handler for starting a query */
@@ -1101,40 +1197,14 @@ start_query_cb (gpointer data)
{
Query *query;
QueryPrivate *priv;
- CORBA_Environment ev;
query = QUERY (data);
priv = query->priv;
priv->idle_id = 0;
- priv->esexp = create_sexp (query);
-
- /* Compile the query string */
-
- g_assert (priv->sexp != NULL);
- e_sexp_input_text (priv->esexp, priv->sexp, strlen (priv->sexp));
-
- if (e_sexp_parse (priv->esexp) == -1) {
- const char *error_str;
-
- error_str = e_sexp_error (priv->esexp);
- g_assert (error_str != NULL);
-
- CORBA_exception_init (&ev);
- GNOME_Evolution_Calendar_QueryListener_notifyQueryDone (
- priv->ql,
- GNOME_Evolution_Calendar_QueryListener_PARSE_ERROR,
- error_str,
- &ev);
-
- if (ev._major != CORBA_NO_EXCEPTION)
- g_message ("start_query_cb(): Could not notify the listener of "
- "a parse error");
-
- CORBA_exception_free (&ev);
+ if (!ensure_sexp (query))
return FALSE;
- }
/* Populate the query with UIDs so that we can process them asynchronously */