1 files changed, 43 insertions, 0 deletions
diff --git a/control/preconditions.hpp b/control/preconditions.hpp
new file mode 100644
index 0000000..61a2f50
--- /dev/null
+++ b/control/preconditions.hpp
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+#pragma once
+
+namespace phosphor
+{
+namespace fan
+{
+namespace control
+{
+namespace precondition
+{
+
+/**
+ * @brief A precondition to compare a group of property values and
+ * subscribe/unsubscribe a set speed event group
+ * @details Compares each entry within the precondition group to a given value
+ * that when each entry's property value matches the given value, the set speed
+ * event is then initialized. At any point a precondition entry's value no
+ * longer matches, the set speed event is removed from being active and fans
+ * are set to full speed.
+ *
+ * @param[in] pg - Precondition property group of property values
+ * @param[in] sse - Set speed event definition
+ *
+ * @return Lambda function
+ *     A lambda function to compare precondition property value states
+ *     and either subscribe or unsubscribe a set speed event group.
+ */
+auto property_states_match(std::vector<PrecondGroup>&& pg,
+                           SetSpeedEvent&& sse)
+{
+    return [pg = std::move(pg),
+            sse = std::move(sse)](auto& zone, auto& group)
+    {
+        // TODO Read/Compare given precondition entries
+        // TODO Only init the event when the precondition(s) are true
+        // TODO Remove the event properties when the precondition(s) are false
+    };
+}
+
+} // namespace precondition
+} // namespace control
+} // namespace fan
+} // namespace phosphor