1 #pragma once 2 3 #include "callback.hpp" 4 #include "data_types.hpp" 5 6 #include <algorithm> 7 #include <functional> 8 9 namespace phosphor 10 { 11 namespace dbus 12 { 13 namespace monitoring 14 { 15 16 /** @class CountCondition 17 * @brief Count properties that satisfy a condition. 18 * 19 * When invoked, a count class instance performs its condition 20 * test in two passes. 21 * 22 * In pass one, apply a C++ relational operator to the value of 23 * each property in the index and a value provided by the 24 * configuration file. 25 * 26 * Count the number of properties that pass the test in pass 27 * one. In pass two, apply a second C++ relational operator 28 * to the number of properties that pass the test from pass one 29 * to a count provided by the configuration file. 30 * 31 * If the oneshot parameter is true, then this condition won't pass 32 * again until it fails at least once. 33 */ 34 template <typename T> class CountCondition : public IndexedConditional 35 { 36 public: 37 CountCondition() = delete; 38 CountCondition(const CountCondition&) = default; 39 CountCondition(CountCondition&&) = default; 40 CountCondition& operator=(const CountCondition&) = default; 41 CountCondition& operator=(CountCondition&&) = default; 42 ~CountCondition() = default; 43 44 CountCondition(const PropertyIndex& conditionIndex, 45 const std::function<bool(size_t)>& _countOp, 46 const std::function<bool(T)>& _propertyOp, 47 bool oneshot = false) : 48 IndexedConditional(conditionIndex), 49 countOp(_countOp), propertyOp(_propertyOp), oneshot(oneshot) 50 { 51 } 52 53 bool operator()() override 54 { 55 // Count the number of properties in the index that 56 // pass the condition specified in the config file. 57 auto count = std::count_if( 58 index.cbegin(), index.cend(), 59 [this](const auto& item) 60 // *INDENT-OFF* 61 { 62 // Get the property value from storage[0], 63 // and save the op result in storage[1]. 64 const auto& storage = std::get<storageIndex>(item.second); 65 // Don't count properties that don't exist. 66 if (std::get<valueIndex>(storage.get()).empty()) 67 { 68 return false; 69 } 70 const auto& value = 71 any_ns::any_cast<T>(std::get<valueIndex>(storage.get())); 72 auto r = propertyOp(value); 73 74 std::get<resultIndex>(storage.get()) = r; 75 76 return r; 77 }); 78 // *INDENT-ON* 79 80 // Now apply the count condition to the count. 81 auto result = countOp(count); 82 83 // If this was a oneshot and the the condition has already 84 // passed, then don't let it pass again until the condition 85 // has gone back to false. 86 if (oneshot && result && lastResult) 87 { 88 return false; 89 } 90 91 lastResult = result; 92 return result; 93 } 94 95 private: 96 /** @brief The comparison to perform on the count. */ 97 std::function<bool(size_t)> countOp; 98 /** @brief The comparison to perform on each property. */ 99 std::function<bool(T)> propertyOp; 100 /** @brief If the condition can be allowed to pass again 101 on subsequent checks that are also true. */ 102 const bool oneshot; 103 /** @brief The result of the previous check. */ 104 bool lastResult = false; 105 }; 106 } // namespace monitoring 107 } // namespace dbus 108 } // namespace phosphor 109