From 9a07020a51949b5e76b0d0296f96c7282c21a9dc Mon Sep 17 00:00:00 2001
From: David Markowitz <39972741+EmosewaMC@users.noreply.github.com>
Date: Thu, 3 Aug 2023 19:31:02 -0700
Subject: [PATCH] perf: Behavior Parameter memory savings (#1166)

* Memory Savings Behavior Parameter table

* Update CDBehaviorParameterTable.h
---
 dDatabase/Tables/CDBehaviorParameterTable.cpp | 45 +++++++++----------
 dDatabase/Tables/CDBehaviorParameterTable.h   | 11 ++---
 2 files changed, 26 insertions(+), 30 deletions(-)

diff --git a/dDatabase/Tables/CDBehaviorParameterTable.cpp b/dDatabase/Tables/CDBehaviorParameterTable.cpp
index 0713e740..8181245b 100644
--- a/dDatabase/Tables/CDBehaviorParameterTable.cpp
+++ b/dDatabase/Tables/CDBehaviorParameterTable.cpp
@@ -1,26 +1,30 @@
 #include "CDBehaviorParameterTable.h"
 #include "GeneralUtils.h"
 
-CDBehaviorParameterTable::CDBehaviorParameterTable(void) {
+uint64_t GetHash(const uint32_t behaviorID, const uint32_t parameterID) {
+	uint64_t hash = behaviorID;
+	hash <<= 31U;
+	hash |= parameterID;
+
+	return hash;
+}
+
+CDBehaviorParameterTable::CDBehaviorParameterTable() {
 	auto tableData = CDClientDatabase::ExecuteQuery("SELECT * FROM BehaviorParameter");
-	uint32_t uniqueParameterId = 0;
-	uint64_t hash = 0;
 	while (!tableData.eof()) {
-		CDBehaviorParameter entry;
-		entry.behaviorID = tableData.getIntField("behaviorID", -1);
+		uint32_t behaviorID = tableData.getIntField("behaviorID", -1);
 		auto candidateStringToAdd = std::string(tableData.getStringField("parameterID", ""));
 		auto parameter = m_ParametersList.find(candidateStringToAdd);
+		uint32_t parameterId;
 		if (parameter != m_ParametersList.end()) {
-			entry.parameterID = parameter;
+			parameterId = parameter->second;
 		} else {
-			entry.parameterID = m_ParametersList.insert(std::make_pair(candidateStringToAdd, uniqueParameterId)).first;
-			uniqueParameterId++;
+			parameterId = m_ParametersList.insert(std::make_pair(candidateStringToAdd, m_ParametersList.size())).first->second;
 		}
-		hash = entry.behaviorID;
-		hash = (hash << 31U) | entry.parameterID->second;
-		entry.value = tableData.getFloatField("value", -1.0f);
+		uint64_t hash = GetHash(behaviorID, parameterId);
+		float value = tableData.getFloatField("value", -1.0f);
 
-		m_Entries.insert(std::make_pair(hash, entry));
+		m_Entries.insert(std::make_pair(hash, value));
 
 		tableData.nextRow();
 	}
@@ -30,27 +34,22 @@ CDBehaviorParameterTable::CDBehaviorParameterTable(void) {
 float CDBehaviorParameterTable::GetValue(const uint32_t behaviorID, const std::string& name, const float defaultValue) {
 	auto parameterID = this->m_ParametersList.find(name);
 	if (parameterID == this->m_ParametersList.end()) return defaultValue;
-
-	uint64_t hash = behaviorID;
-
-	hash = (hash << 31U) | parameterID->second;
+	auto hash = GetHash(behaviorID, parameterID->second);
 
 	// Search for specific parameter
-	const auto& it = m_Entries.find(hash);
-	return it != m_Entries.end() ? it->second.value : defaultValue;
+	auto it = m_Entries.find(hash);
+	return it != m_Entries.end() ? it->second : defaultValue;
 }
 
 std::map<std::string, float> CDBehaviorParameterTable::GetParametersByBehaviorID(uint32_t behaviorID) {
 	uint64_t hashBase = behaviorID;
 	std::map<std::string, float> returnInfo;
-	uint64_t hash;
-	for (auto& parameterCandidate : m_ParametersList) {
-		hash = (hashBase << 31U) | parameterCandidate.second;
+	for (auto& [parameterString, parameterId] : m_ParametersList) {
+		uint64_t hash = GetHash(hashBase, parameterId);
 		auto infoCandidate = m_Entries.find(hash);
 		if (infoCandidate != m_Entries.end()) {
-			returnInfo.insert(std::make_pair(infoCandidate->second.parameterID->first, infoCandidate->second.value));
+			returnInfo.insert(std::make_pair(parameterString, infoCandidate->second));
 		}
 	}
 	return returnInfo;
 }
-
diff --git a/dDatabase/Tables/CDBehaviorParameterTable.h b/dDatabase/Tables/CDBehaviorParameterTable.h
index b0715684..249caacf 100644
--- a/dDatabase/Tables/CDBehaviorParameterTable.h
+++ b/dDatabase/Tables/CDBehaviorParameterTable.h
@@ -5,18 +5,15 @@
 #include <unordered_map>
 #include <unordered_set>
 
-struct CDBehaviorParameter {
-	unsigned int behaviorID;											//!< The Behavior ID
-	std::unordered_map<std::string, uint32_t>::iterator parameterID;   	//!< The Parameter ID
-	float value;            											//!< The value of the behavior template
-};
-
 class CDBehaviorParameterTable : public CDTable<CDBehaviorParameterTable> {
 private:
-	std::unordered_map<uint64_t, CDBehaviorParameter> m_Entries;
+	typedef uint64_t BehaviorParameterHash;
+	typedef float BehaviorParameterValue;
+	std::unordered_map<BehaviorParameterHash, BehaviorParameterValue> m_Entries;
 	std::unordered_map<std::string, uint32_t> m_ParametersList;
 public:
 	CDBehaviorParameterTable();
+
 	float GetValue(const uint32_t behaviorID, const std::string& name, const float defaultValue = 0);
 
 	std::map<std::string, float> GetParametersByBehaviorID(uint32_t behaviorID);