Introduce afb_eventid

[src/app-framework-binder.git] / include / afb / afb-event.h

diff --git a/include/afb/afb-event.h b/include/afb/afb-event.h
new file mode 100644 (file)
index 0000000..c3686fd
--- /dev/null
+++ b/include/afb/afb-event.h
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2016, 2017 "IoT.bzh"
+ * Author: José Bollo <jose.bollo@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "afb-eventid-itf.h"
+
+/*
+ * Describes the request of afb-daemon for bindings
+ */
+struct afb_event
+{
+       const struct afb_eventid_itf *itf;      /* the interface to use */
+       struct afb_eventid *closure;            /* the closure argument for functions of 'itf' */
+};
+
+/*
+ * Checks wether the 'event' is valid or not.
+ *
+ * Returns 0 if not valid or 1 if valid.
+ */
+static inline int afb_event_is_valid(struct afb_event event)
+{
+       return !!event.itf;
+}
+
+/*
+ * Broadcasts widely the 'event' with the data 'object'.
+ * 'object' can be NULL.
+ *
+ * For convenience, the function calls 'json_object_put' for 'object'.
+ * Thus, in the case where 'object' should remain available after
+ * the function returns, the function 'json_object_get' shall be used.
+ *
+ * Returns the count of clients that received the event.
+ */
+static inline int afb_event_broadcast(struct afb_event event, struct json_object *object)
+{
+       return event.itf->broadcast(event.closure, object);
+}
+
+/*
+ * Pushes the 'event' with the data 'object' to its observers.
+ * 'object' can be NULL.
+ *
+ * For convenience, the function calls 'json_object_put' for 'object'.
+ * Thus, in the case where 'object' should remain available after
+ * the function returns, the function 'json_object_get' shall be used.
+ *
+ * Returns the count of clients that received the event.
+ */
+static inline int afb_event_push(struct afb_event event, struct json_object *object)
+{
+       return event.itf->push(event.closure, object);
+}
+
+/* OBSOLETE */
+#define afb_event_drop afb_event_unref
+
+/*
+ * Gets the name associated to the 'event'.
+ */
+static inline const char *afb_event_name(struct afb_event event)
+{
+       return event.itf->name(event.closure);
+}
+
+/*
+ * Decreases the count of reference to 'event' and
+ * destroys the event when the reference count falls to zero.
+ */
+static inline void afb_event_unref(struct afb_event event)
+{
+       event.itf->unref(event.closure);
+}
+
+/*
+ * Increases the count of reference to 'event'
+ */
+static inline void afb_event_addref(struct afb_event event)
+{
+       event.itf->addref(event.closure);
+}
+