From 90bfaea4c69773f4f252d06fad1147a718e8b863 Mon Sep 17 00:00:00 2001
From: Ratan Gupta <ratagupt@in.ibm.com>
Date: Fri, 6 Oct 2017 20:56:31 +0530
Subject: Initial support for event callbacks

Add parser support for template rendering of events.
Also defines the EventBase and Event classes.
EventBase is parent of Event.

Change-Id: I6b07b415acf510a8437529095bd489c0af73ddf5
Signed-off-by: Ratan Gupta <ratagupt@in.ibm.com>
---
 src/event.hpp | 119 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 src/event.hpp

(limited to 'src/event.hpp')

diff --git a/src/event.hpp b/src/event.hpp
new file mode 100644
index 0000000..8006c23
--- /dev/null
+++ b/src/event.hpp
@@ -0,0 +1,119 @@
+#pragma once
+
+#include <phosphor-logging/log.hpp>
+#include "callback.hpp"
+
+namespace phosphor
+{
+namespace dbus
+{
+namespace monitoring
+{
+
+/** @class EventBase
+ *  @brief Event callback implementation.
+ *
+ *  The event callback creates the event dbus object
+ *  which has event message and metadata as key value pairs
+ *  as specified by the client supplied property index.
+ */
+class EventBase : public IndexedCallback
+{
+    public:
+        EventBase() = delete;
+        EventBase(const EventBase&) = delete;
+        EventBase(EventBase&&) = default;
+        EventBase& operator=(const EventBase&) = delete;
+        EventBase& operator=(EventBase&&) = default;
+        virtual ~EventBase() = default;
+        EventBase(const PropertyIndex& index) :
+            IndexedCallback(index) {}
+
+        /** @brief Callback interface implementation. */
+        void operator()() override
+        {
+            for (const auto& n : index)
+            {
+                const auto& path = std::get<pathIndex>(n.first);
+                const auto& propertyMeta = std::get<metaIndex>(n.first);
+                const auto& value = std::get<valueIndex>(n.second);
+
+                if (!value.get().empty())
+                {
+                    createEvent(
+                            path,
+                            propertyMeta,
+                            value);
+                }
+            }
+
+        }
+
+    private:
+
+        /** @brief Create the event Dbus Object.
+         *  @param[in] path - Dbus Object Path for which the
+         *                    property has changed.
+         *  @param[in] property - Name of the property whose value
+         *                        has been changed.
+         *  @param[in] value - Changed property value.
+         */
+        virtual void createEvent(
+            const std::string& path,
+            const std::string& property,
+            const any_ns::any& value) const = 0;
+
+
+};
+
+/** @class Event
+ *  @brief C++ type specific logic for the event callback.
+ *
+ *  @tparam T - The C++ type of the property values being traced.
+ */
+template <typename T>
+class Event : public EventBase
+{
+    public:
+        Event() = delete;
+        Event(const Event&) = delete;
+        Event(Event&&) = default;
+        Event& operator=(const Event&) = delete;
+        Event& operator=(Event&&) = default;
+        ~Event() = default;
+
+        /** @brief Constructor.
+         *  @param[in] eventName - Name of the event.
+         *  @param[in] eventMessage- Event Message.
+         *  @param[in] index - look up index for the properties.
+         */
+        Event(std::string eventName,
+              std::string eventMessage,
+              const PropertyIndex& index) :
+            EventBase(index),
+            name(eventName),
+            message(eventMessage) {}
+
+    private:
+        /** @brief Create the event Dbus Object.
+         *  @param[in] path - Dbus Object Path for which the
+         *                    property has changed.
+         *  @param[in] property - Name of the property whose value
+         *                        has been changed.
+         *  @param[in] value - Changed property value.
+         */
+        void createEvent(
+            const std::string& path,
+            const std::string& property,
+            const any_ns::any& value) const override {}
+
+        /** @brief Event Name */
+        std::string name;
+
+        /** @brief Event Message */
+        std::string message;
+};
+
+} // namespace monitoring
+} // namespace dbus
+} // namespace phosphor
-- 
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