Add callback contexts

Add the notion of a callback context. This enables callbacks
to have logic around the conditions they were invoked in.

There are two context on which call back can be invoked
1) Startup: during startup all the call backs will be called
2) Signal: As part of condition match on the watched properties.

Callback would behave differently based on the context.
eg: eventCallback
1) Startup: Don't take any action.
2) Signal: Create the Dbus Object for the event.

Change-Id: If455558798ac3e44bbd8a93de0ce1b09d2e308ae
Signed-off-by: Ratan Gupta <ratagupt@in.ibm.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/data_types.hpp b/src/data_types.hpp
index 1ba0b8a..12d1d6d 100644
--- a/src/data_types.hpp
+++ b/src/data_types.hpp
@@ -21,6 +21,12 @@ constexpr auto propertyIndex = 2;
 constexpr auto valueIndex = 2;
 constexpr auto metaIndex = 1;
 
+enum class Context
+{
+    START,
+    SIGNAL,
+};
+
 /** @brief A map with references as keys. */
 template <typename Key, typename Value>
 using RefKeyMap = std::map<std::reference_wrapper<Key>, Value, std::less<Key>>;