From 4041d720cf6387aa198c620cc9c6eaa86ac18cba Mon Sep 17 00:00:00 2001
From: Brad Bishop <bradleyb@fuzziesquirrel.com>
Date: Sun, 21 May 2017 10:06:07 -0400
Subject: Add conditional callbacks

Enable conditional application of callbacks.

Change-Id: I9d765e5f585aac40994b65da3b51ea891beae9bf
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
---
 src/count.hpp | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 src/count.hpp

(limited to 'src/count.hpp')

diff --git a/src/count.hpp b/src/count.hpp
new file mode 100644
index 0000000..a588ccc
--- /dev/null
+++ b/src/count.hpp
@@ -0,0 +1,82 @@
+#pragma once
+
+#include "callback.hpp"
+#include "data_types.hpp"
+
+namespace phosphor
+{
+namespace dbus
+{
+namespace monitoring
+{
+
+/** @class CountCondition
+ *  @brief Count properties that satisfy a condition.
+ *
+ *  When invoked, a count class instance performs its condition
+ *  test in two passes.
+ *
+ *  In pass one, apply a C++ relational operator to the value of
+ *  each property in the index and a value provided by the
+ *  configuration file.
+ *
+ *  Count the number of properties that pass the test in pass
+ *  one.  In pass two, apply a second C++ relational operator
+ *  to the number of properties that pass the test from pass one
+ *  to a count provided by the configuration file.
+ */
+template <typename T>
+class CountCondition : public IndexedConditional
+{
+    public:
+        CountCondition() = delete;
+        CountCondition(const CountCondition&) = default;
+        CountCondition(CountCondition&&) = default;
+        CountCondition& operator=(const CountCondition&) = default;
+        CountCondition& operator=(CountCondition&&) = default;
+        ~CountCondition() = default;
+
+        CountCondition(
+            const PropertyIndex& conditionIndex,
+            const std::function<bool(size_t)>& _countOp,
+            const std::function<bool(T)>& _propertyOp) :
+            IndexedConditional(conditionIndex),
+            countOp(_countOp),
+            propertyOp(_propertyOp) {}
+
+        bool operator()() override
+        {
+            // Count the number of properties in the index that
+            // pass the condition specified in the config file.
+            auto count = std::count_if(
+                             index.cbegin(),
+                             index.cend(),
+                             [this](const auto & item)
+            // *INDENT-OFF*
+                             {
+                                 const auto& storage = std::get<2>(
+                                     item.second);
+                                 // Don't count properties that don't exist.
+                                 if (storage.get().empty())
+                                 {
+                                     return false;
+                                 }
+                                 const auto& value = any_ns::any_cast<T>(
+                                     storage);
+                                 return propertyOp(value);
+                             });
+            // *INDENT-ON*
+
+            // Now apply the count condition to the count.
+            return countOp(count);
+        }
+
+    private:
+        /** @brief The comparison to perform on the count. */
+        std::function<bool(size_t)> countOp;
+        /** @brief The comparison to perform on each property. */
+        std::function<bool(T)> propertyOp;
+};
+} // namespace monitoring
+} // namespace dbus
+} // namespace phosphor
-- 
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