2 files changed, 43 insertions, 0 deletions
diff --git a/indra/llinventory/lleconomy.cpp b/indra/llinventory/lleconomy.cpp
index c6eaa6d3e1..d643ea6ed9 100644
--- a/indra/llinventory/lleconomy.cpp
+++ b/indra/llinventory/lleconomy.cpp
@@ -48,6 +48,31 @@ LLGlobalEconomy::LLGlobalEconomy()
 LLGlobalEconomy::~LLGlobalEconomy()
 { }
 
+void LLGlobalEconomy::addObserver(LLEconomyObserver* observer)
+{
+	mObservers.push_back(observer);
+}
+
+void LLGlobalEconomy::removeObserver(LLEconomyObserver* observer)
+{
+	std::list<LLEconomyObserver*>::iterator it =
+		std::find(mObservers.begin(), mObservers.end(), observer);
+	if (it != mObservers.end())
+	{
+		mObservers.erase(it);
+	}
+}
+
+void LLGlobalEconomy::notifyObservers()
+{
+	for (std::list<LLEconomyObserver*>::iterator it = mObservers.begin();
+		it != mObservers.end();
+		++it)
+	{
+		(*it)->onEconomyDataChange();
+	}
+}
+
 // static
 void LLGlobalEconomy::processEconomyData(LLMessageSystem *msg, LLGlobalEconomy* econ_data)
 {
@@ -88,6 +113,8 @@ void LLGlobalEconomy::processEconomyData(LLMessageSystem *msg, LLGlobalEconomy*
 	econ_data->setTeleportPriceExponent(f);
 	msg->getS32Fast(_PREHASH_Info, _PREHASH_PriceGroupCreate, i);
 	econ_data->setPriceGroupCreate(i);
+
+	econ_data->notifyObservers();
 }
 
 S32	LLGlobalEconomy::calculateTeleportCost(F32 distance) const
diff --git a/indra/llinventory/lleconomy.h b/indra/llinventory/lleconomy.h
index cc6643f955..eb2ecf71ba 100644
--- a/indra/llinventory/lleconomy.h
+++ b/indra/llinventory/lleconomy.h
@@ -31,6 +31,16 @@
 class LLMessageSystem;
 class LLVector3;
 
+/**
+ * Register an observer to be notified of economy data updates coming from server.
+ */
+class LLEconomyObserver
+{
+public:
+	virtual ~LLEconomyObserver() {}
+	virtual void onEconomyDataChange() = 0;
+};
+
 class LLGlobalEconomy
 {
 public:
@@ -46,6 +56,10 @@ public:
 
 	virtual void print();
 
+	void	addObserver(LLEconomyObserver* observer);
+	void	removeObserver(LLEconomyObserver* observer);
+	void	notifyObservers();
+
 	static void processEconomyData(LLMessageSystem *msg, LLGlobalEconomy* econ_data);
 
 	S32		calculateTeleportCost(F32 distance) const;
@@ -89,6 +103,8 @@ private:
 	S32		mTeleportMinPrice;
 	F32		mTeleportPriceExponent;
 	S32     mPriceGroupCreate;
+
+	std::list<LLEconomyObserver*> mObservers;
 };