From 26e9b5e2f6f52d56f679d845d0fe8356cec381ec Mon Sep 17 00:00:00 2001
From: JoelKatz <DavidJoelSchwartz@GMail.com>
Date: Tue, 4 Dec 2012 13:29:51 -0800
Subject: [PATCH] Updates to local and remote transaction fee factor tracking.

---
 src/cpp/ripple/LoadManager.cpp | 47 ++++++++++++++++++++++++++++++++++
 src/cpp/ripple/LoadManager.h   | 27 +++++++++++++++++++
 2 files changed, 74 insertions(+)

diff --git a/src/cpp/ripple/LoadManager.cpp b/src/cpp/ripple/LoadManager.cpp
index 7ccb72060..4791083b1 100644
--- a/src/cpp/ripple/LoadManager.cpp
+++ b/src/cpp/ripple/LoadManager.cpp
@@ -105,3 +105,50 @@ bool LoadManager::adjust(LoadSource& source, int credits) const
 
 	return false;
 }
+
+uint64 LoadTrack::scaleFee(uint64 fee)
+{
+	static uint64 midrange(0x00000000FFFFFFFF);
+	int factor = (mLocalTxnLoadFee > mRemoteTxnLoadFee) ? mLocalTxnLoadFee : mRemoteTxnLoadFee;
+
+	if (fee > midrange)			// large fee, divide first
+		return (fee >> 16) * factor;
+	else						// small fee, multiply first
+		return (fee * factor) >> 16;
+}
+
+void LoadTrack::raiseRemoteFee()
+{
+	if (mRemoteTxnLoadFee < mLocalTxnLoadFee) // make sure this fee takes effect
+		mRemoteTxnLoadFee = mLocalTxnLoadFee;
+
+	if (mRemoteTxnLoadFee < 268435456) // no more than a million
+		mRemoteTxnLoadFee += (mRemoteTxnLoadFee >> 4); // increment by 1/16th
+}
+
+void LoadTrack::lowerRemoteFee()
+{
+	mLocalTxnLoadFee -= (mLocalTxnLoadFee >> 4); // reduce by 1/16th
+
+	if (mLocalTxnLoadFee < 256)
+		mLocalTxnLoadFee = 256;
+}
+
+void LoadTrack::raiseLocalFee()
+{
+	if (mLocalTxnLoadFee < mLocalTxnLoadFee) // make sure this fee takes effect
+		mLocalTxnLoadFee = mLocalTxnLoadFee;
+
+	if (mLocalTxnLoadFee < 268435456) // no more than a million
+		mLocalTxnLoadFee += (mLocalTxnLoadFee >> 4); // increment by 1/16th
+}
+
+void LoadTrack::lowerLocalFee()
+{
+	mLocalTxnLoadFee -= (mLocalTxnLoadFee >> 4); // reduce by 1/16th
+
+	if (mLocalTxnLoadFee < 256)
+		mLocalTxnLoadFee = 256;
+}
+
+// vim:ts=4
diff --git a/src/cpp/ripple/LoadManager.h b/src/cpp/ripple/LoadManager.h
index 5b9e2207b..a49ece3f3 100644
--- a/src/cpp/ripple/LoadManager.h
+++ b/src/cpp/ripple/LoadManager.h
@@ -3,6 +3,8 @@
 
 #include <boost/thread/mutex.hpp>
 
+#include "types.h"
+
 class LoadSource
 { // a single endpoint that can impose load
 	friend class LoadManager;
@@ -60,4 +62,29 @@ public:
 	bool adjust(LoadSource&, int credits) const;	// return value: false = balance okay, true = warn/cutoff
 };
 
+class LoadTrack
+{ // structure that tracks our current fee/load schedule
+protected:
+
+	uint32 mLocalTxnLoadFee;		// Scale factor, 256 = normal fee
+	uint32 mRemoteTxnLoadFee;		// Scale factor, 256 = normal fee
+	uint32 mPeerLoadSchedule;		// Schedule setting, 0 = normal schedule
+	uint32 mClientLoadSchedule;		// Schedule setting, 0 = normal schedule
+
+public:
+
+	LoadTrack() : mLocalTxnLoadFee(256), mRemoteTxnLoadFee(256), mPeerLoadSchedule(0), mClientLoadSchedule(0)
+	{ ; }
+
+	uint64 scaleFee(uint64 fee);
+
+	void raiseRemoteFee();
+	void raiseLocalFee();
+	void lowerRemoteFee();
+	void lowerLocalFee();
+};
+
+
 #endif
+
+// vim:ts=4